Essex Industries, Inc..
8007 Chivvis Drive
St. Louis, MO 63123
Next-Generation Portable Therapeutic Liquid Oxygen (NPTLOX)
System
Operation and Maintenance Manual
NPTLOX Part Number 50C-0083-1
Manual Part Number 50C-0083-0161 Rev G
Page Intentionally Left Blank
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
Table of Contents
1.0 INTRODUCTION
1
1.1 Purpose
1
1.2 Scope
1
1.3 Safety Precautions
1
1.4 Capabilities
3
1.5 Performance Characteristics
3
1.6 Description
4
1.7 Power Information
4
1.8 Properties of Liquid Oxygen
4
1.9 Tools and Test Equipment
5
1.10 Operation and Maintenance Manual Corrections
6
2.0 PREPARATION FOR USE
7
2.1 Condition On Receipt
7
2.2 External Surfaces
7
2.3 Inspection
7
2.4 Quantity Indicator Battery Checkout
7
2.5 Quantity Indicator Empty Checkout
8
3.0 PRINCIPLES OF OPERATION
9
4.0 OPERATING INSTRUCTIONS
10
4.1 General
10
4.2 Illustrations and Explanations
10
4.3 Supplemental Equipment
18
4.4 Servicing the NPTLOX System
21
4.5 Operation Instructions
24
4.6 Liquid Oxygen Draining
26
Manual Part Number 50C-0083-0161 Rev G
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4.7 Purging
27
5.0 MAINTENANCE AND SERVICING INSTRUCTIONS
30
5.1 Maintenance Plan
30
5.2 Tools and Equipment
30
5.3 Service Life
30
5.4 Field Maintenance
30
5.5 Troubleshooting
33
5.6 Disassembly of the Container Assembly
34
5.7 Cleaning
35
5.8 Inspection
35
5.9 Repair or Replacement
38
5.10 Reassembly of the Container Assembly
38
5.11 Calibration and Testing
39
6.0 PREPARATION FOR SHIPMENT
51
7.0 STORAGE
52
8.0 PARTS LIST
53
8.1 Parts List Illustrations
9.0 OPERATIONAL DIAGRAMS
53
62
9.1 Fill Mode
62
9.2 Buildup Mode
63
9.3 Operation Mode
64
10.0 ACRONYMS AND ABBREVIATIONS
65
APPENDIX A
66
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
1.0
INTRODUCTION
1.1
Purpose
The Next-Generation Portable Therapeutic Liquid Oxygen (NPTLOX) System when filled with
liquid oxygen (LOX) will provide for an uninterrupted supply of therapeutic oxygen to meet and achieve
Air Mobility Command/Surgeon General (AMC/SG) Aeromedical Evacuation (AE) mission
requirements.
1.2
Scope
The technical documentation associated with the NPTLOX System consists of a Government
approved operation and maintenance manual. The operation and maintenance manual includes
arrangement drawings, operating instructions, troubleshooting procedures, servicing procedures, and Olevel PM and CM procedures. An operation and maintenance manual will be provided with each
delivered NPTLOX System.
1.3
Safety Precautions
Read these instructions first. Throughout this manual there will be three kinds of information
with emphasis in the text. Carefully read and understand these notices. Each is important and related to
the text following each notice.
WARNING
Warnings identify conditions that concern your personal safety and the
safety of others. They include actions required to prevent injury or
death.
CAUTION
Cautions identify conditions that may cause possible damage to the
equipment or other property; or situations that may cause reduced, or
loss of, oxygen flow. Ignoring cautions may cause damage or make the
equipment inoperative.
Note:
Indicates points of particular interest or emphasis for more efficient and
convenient operation.
1.3.1 Warnings
WARNING

Smoking – Do not allow smoking or other sources of flame within 50
feet of the NPTLOX System.

Absorbent Material – Keep oxygen away from absorbent materials,
loose clothing, or rags. These materials can trap gaseous oxygen
and can later be easily ignited.
Manual Part Number 50C-0083-0161 Rev G
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Essex Industries, Inc.
WARNING
2

Hydrocarbons – Keep the NPTLOX System, the surrounding work
area, tools, associated equipment, and clothing as clean as possible
and free from oil, grease, gasoline, kerosene, and other
hydrocarbons. Spontaneous ignition upon contact of oxygen with
these substances may result.

Ventilation – Operate and maintain the NPTLOX System only in a
well-ventilated location.

Freezing risk – Avoid skin contact with LOX. The extreme low
temperature of the liquid will immediately freeze any skin that it
contacts and severe frostbite may result.

The NPTLOX System should remain upright at all times when filled
with LOX to avoid improper operation and excessive venting of
oxygen.

Prior to connecting an oxygen hose to an outlet port, a flow control
valve, with the control knob set at zero (0), must be attached to the
mating hose fitting. This step is imperative to prevent pressurized
oxygen from escaping out an open-ended hose.

Never allow the system vent port to be obstructed. The vent port
must remain open at all times. Never confine liquid oxygen in any
piping or container without adequate safety devices. The pressure
build up when the liquid expands to gas will rupture most piping,
tubing or containers.

Protective clothing and safety devices should be worn by personnel
handling liquid oxygen during servicing of the NPTLOX System.

Only personnel fully trained and qualified in handling and servicing
liquid oxygen are authorized to service the NPTLOX System.

Stay clear of the liquid oxygen fill and vent ports during servicing.

Stand to one side when disconnecting the servicing transfer nozzle
and/or hose to avoid possible liquid oxygen contact.

Drip pans shall be kept clean and not be utilized for any purpose
other than LOX servicing. Any residual LOX in the drip pan should
be allowed to boil off and not be poured off.

To prevent excessive pressure buildup in the servicing hose and
possible injury to personnel, ensure that the oxygen tank servicing
hose is fully depressurized. Open the servicing line pressure relief
valve if the oxygen tank is so equipped.

Stabilization – After filling, allow the Container Assembly to
temperature stabilize for a minimum period of thirty (30) minutes
prior to transporting or loading in or on any vehicle or aircraft.
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
WARNING

Ambulance – Position the NPTLOX System so that it does not
inhibit emergency resuscitative care in the ambulance, i.e.,
Advanced Cardiac Life Support (ACLS) initiatives, or impede access
to emergency equipment, supplies, or systems in rear-loading
ambulances.

Purging – Only gaseous nitrogen conforming to Type I, Grades A or
B, Class 1 of A-A-59503 will be used as a source for purging.

Storage/Shipment – Unit must be purged of LOX prior to
storage/shipment within shipping container.

Batteries – Batteries must be removed from quantity indicator prior
to prolonged storage.
1.3.2 Cautions
CAUTION
Federal law restricts this device to sale by or on the order of a physician.
1.4
Capabilities
The NPTLOX System has the capacity to store twenty liters of LOX and convert it to a gaseous
state. The gaseous oxygen is then humidified and delivered at a controlled flow rate to up to six
patients. It will also have the capability to be filled by current LOX storage/filling systems used in the
Air Force.
1.5
Performance Characteristics
Capacity
Service
Delivery Rate
Temperature:
Operating
Delivery
Non-Operating (Storage)
Humidity:
Operating
Storage (in shipping container)
Altitude
Relief Valve Settings:
System
Safety
Rupture Disc Burst Pressure
Optimal Time To Performance After Filling
20 Liters of LOX
Up to six patients
Up to 66 LPM at 50±5 PSIG
32F to 120F (0C to 49C)
Within 10F of Ambient
-40F to 158F (-40C to 70C)
Up to 95%
Up to100%
Sea level to 15,000 feet
100 – 120 PSIG
170 – 200 PSIG
200 – 250 PSIG at 72F (22C)
10 minutes
CAUTION
The oxygen flow produced by this device can be within 10 degrees F of
ambient temperature. Caution should be exercised if the room
temperature is warmer than 90 degrees F.
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1.6
Description
Nomenclature
NPTLOX System
Overall Dimensions (nominal):
Length
Width
Height
Weight (Full)
22 inches
18 inches
32 inches
148 lbs
Accessory Kit Contents, 3 Each Item:
Oxygen Hose
Flow Control Valve
Humidification Bottle
20 feet
12 settings (0, .5, 1, 2, 3, 4, 5, 6, 8, 10, 12 & 15 LPM)
Empty 300 ml capacity
1.7
Power Information
Electrical power consists of two 9V lithium batteries (NSN 6135-01-369-9792).
1.8
Properties of Liquid Oxygen
a. Liquid oxygen is a pale blue, nonviscous, water like fluid. Liquid oxygen boils at -297ºF (183ºC). At atmospheric pressure it is 1.14 times heavier than water and weighs 2.512 pounds
per liter.
b. Oxygen is a very reactive material, combining with most of the chemical elements. The
union of oxygen with another substance is known as oxidation. Extremely rapid or
spontaneous oxidation is known as combustion. While oxygen is non-combustible, it
strongly supports and rapidly accelerates the combustion of all flammable materials, some to
an explosive degree.
c. Liquid oxygen, when converted to gaseous oxygen, expands to about 860 times its original
volume. One cubic foot of liquid oxygen (7.5 gallons) expands to about 860 cubic feet of gas
at 70ºF (21ºC) and sea level pressure. Liquid to gas expansion at atmospheric pressure is:
Table 1-1. Liquid to Gas Expansion.
Liquid Oxygen at -297F (-183C)
1 liter
5 liters
10 liters
15 liters
20 liters
4
Gaseous Oxygen at 70F (21C)
860 liters
4,300 liters
8,600 liters
12,900 liters
17,200 liters
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
1.9
Tools and Test Equipment
A list of support equipment recommended for maintaining the unit is contained in Table 1-2.
Table 1-2. Special Tools and Test Equipment List.
Tool/Equipment No.
50C-0068-2
50C-0020-1
50C-0083-0165
MIL-L-25567
Figure No.
1.1
1.2
1.3
N/A
Nomenclature
Purge Kit, Converter System,
Liquid Oxygen
Cap, Vent
Test Fixture, Pressure Gauge
Leak Detector
Figure 1.1. Purge Kit.
Use and Application
See Para. 4.7.2
See Para. 4.4.1
See Para. 5.11.2
See Para. 5.11.1
Figure 1.2. Vent Cap.
Figure 1.3. Pressure Gauge Test Fixture.
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1.10
Operation and Maintenance Manual Corrections
Discrepancies of a routine nature, problems, and suggestions regarding this manual are to be
described on the Operation and Maintenance Manual Deficiency/Evaluation Report (see Appendix A).
Discrepancies of an urgent nature (e.g., safety issues) should be reported via e-mail to
cryo@essexind.com.
Upon receipt of the deficiency report, Essex will review and resolve technical and administrative
discrepancies. After resolution of the discrepancy, users will be notified of approved changes.
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
2.0
PREPARATION FOR USE
2.1
Condition On Receipt
The NPTLOX System is shipped in a reusable shipping container from the manufacturer
complete with an accessory kit assembly interlocked to the top of the Container Assembly forming a
single unit. The Container Assembly will have been pressurized to 40 +0/-5 PSIG with clean, dry,
gaseous nitrogen.
2.2
External Surfaces
Upon receipt, remove the NPTLOX System from the shipping container and thoroughly
inspect the system for possible damage or contamination that may have occurred during
shipment.
2.3
Inspection
The inspection procedures of paragraph 5.4.3 are to be performed before use and before
the Container Assembly is filled with liquid oxygen.
a. If the NPTLOX System has not been stored in an environment in which the
temperature and humidity are within 77  28F and 50  30% RH respectively,
inspect the outlet pressure gauge to ascertain that the Container Assembly has retained
a positive pressure of at least 5 PSIG.
b. If the outlet pressure gauge does not register a reading, purge the Container Assembly
in accordance with the procedure presented in paragraph 4.7.2.
Note:
If at any time it is believed that the NPTLOX System has become
contaminated and the positive pressure is below 5 PSIG, purging should
be accomplished prior to use.
2.4
Quantity Indicator Battery Checkout
The quantity indicator battery condition is to be checked during each servicing of the system
Container Assembly.
a. To verify that quantity indicator battery power is available, press the “TEST” button
and observe the reading (see Figure 2.1). The reading should be between “10.0” and
“16.0”.
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Essex Industries, Inc.
Figure 2.1. Quantity Indicator and Battery Compartment.
CAUTION
Use only batteries recommended in this manual.
b. If the indication is not within the limits specified above, replace the batteries as outlined in
paragraph 5.4.2.
2.5
Quantity Indicator Empty Checkout
The quantity indicator calibration when the system is empty should be checked upon initial
receipt and after purging of the system Container Assembly.
a. To verify the quantity indicator is within proper calibration when the system Container
Assembly is empty of LOX, press the “LOX QTY” button (see Figure 2.1). The reading
should be 0.0  0.5.
b. If the indication is not within the limits specified above, return the system to the appropriate
repair facility.
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
3.0
PRINCIPLES OF OPERATION
The system has the capacity to store twenty liters (20L) of liquid oxygen (LOX) and convert the
LOX to a gaseous state. The gaseous oxygen is then humidified and delivered at a controlled flow rate
to up to six (6) ambulatory or litter patients. The NPTLOX System is configured to be carried on-board
and tied down to the floor of the aircraft cargo compartment.
a. The NPTLOX System is configured to be filled by externally accepting the CRU-59/A
female filler valve from a LOX supply source. It is capable of storing up to twenty (20) liters
of oxygen in the liquid state. The contained LOX volume can be verified by the incorporated
contents gauging system.
b. The LOX is converted to a gaseous form and pressure is maintained at approximately 90
PSIG. Heat exchangers are provided to elevate the gas temperature to a delivery temperature
that is within 10ºF of the ambient temperature. To prevent a potentially hazardous situation
from gas pressure buildup, both a venting relief valve, set at 120 PSIG and a nominal 225
PSIG burst disc are incorporated into the NPTLOX System.
c. Additionally, another relief valve, set at approximately 180 PSIG, is installed in the
Container Assembly plumbing to protect the system from over-pressurization.
d. The pressure regulator lowers the gas pressure to a nominal 50 PSIG before it reaches the six
(6) supply outlet disconnects located on the upper surface of the Container Assembly.
e. The pressure gauge on the right side of the NPTLOX System continuously registers oxygen
delivery pressure.
f. The system is completed by the addition of the components from the accessory kit assembly.
This kit assembly is identical with the one used on the PTLOX System with the exception of
the addition of three Schrader/DISS adapter fittings. The three (3) supply hoses, when
inserted into the Container Assembly disconnect receptacles and attached to the individual
flow control valves, provide for the delivery of oxygen at a nominal pressure of 50 PSIG.
With the flow control valves assembled to the humidification kits, therapeutic oxygen flow
can be regulated to each patient's mask, in 12 increments, to a maximum rate of 15 LPM.
The kit assembly comes with only three valve/clip assemblies, see Figure 4.4, but the
Container Assembly can handle up to a maximum of six valve/clip assemblies.
Note:
If more than 3 outlets are used simultaneously, ensure that the
combined total flow rate does not exceed 66 LPM.
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4.0
OPERATING INSTRUCTIONS
4.1
General
The instructions in this section are for information and guidance of the personnel responsible for
operation of the NPTLOX System. The operator shall be completely familiar with, as well as know, the
location and purpose of all operating controls and indicating instruments. All persons who operate the
NPTLOX System shall be thoroughly familiar with the hazards of oxygen and the necessary safety
precautions for the work assigned.
WARNING
4.2

Smoking – Do not allow smoking or other sources of flame within 50
feet of the NPTLOX System.

Absorbent Material – Keep oxygen away from absorbent materials,
loose clothing, or rags. These materials can trap gaseous oxygen
and can later be easily ignited.

Hydrocarbons – Keep the NPTLOX System, the surrounding work
area, tools, associated equipment, and clothing as clean as possible
and free from oil, grease, gasoline, kerosene, and other
hydrocarbons. Spontaneous ignition upon contact of oxygen with
these substances may result.

Ventilation – Operate and maintain the NPTLOX System only in a
well-ventilated location.

Transporting – Secure the NPTLOX System in place when used in
flight or transported in a ground vehicle.

Ambulance – Position the NPTLOX System so that it does not
inhibit emergency resuscitative care in the ambulance, i.e.,
Advanced Cardiac Life Support (ACLS) initiatives, or impede access
to emergency equipment, supplies, or systems in rear-loading
ambulances.
Illustrations and Explanations
4.2.1 Gauges and Indicators
An outlet pressure gauge and a LOX quantity indicator are provided on the right side of the
Container Assembly (see Figure 4.1).
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
Figure 4.1. Gauge and Quantity Indicator.
a. The pressure gauge registers from 0 to 100 PSIG and, under normal operation, will read 50±5
PSIG. The green section on the pressure indicator indicates the normal operating pressure.
This gauge will continuously monitor the Container Assembly supply line pressure. See
Figure 4.2.
Figure 4.2. Outlet Pressure Gauge.
b. The liquid oxygen quantity indicator has a liquid crystal digital type display that exhibits,
from 0.0 to 20.0, liters of liquid oxygen contained by means of an electrical capacitancesensing element. The indicator is normally off and registers quantity only upon pressing the
“LOX QTY” button. To verify that quantity indicator battery power is available, press the
“TEST” button and observe the reading. This reading should be between “10.0” and “16.0”.
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4.2.2 Accessory Kit
The Accessory Kit is composed of three sets of oxygen hoses on storage racks, Schrader/DISS
adapter fittings, flow control valves, and humidification bottles (see Figure 4.3).
Figure 4.3. NPTLOX Accessory Kit.
4.2.2.1 Valve/Clip Assembly
Each assembly, of which three units are supplied in the kit assembly, is comprised of a flow
control valve, a clip assembly and a retaining strap. A typical setup of the components is as shown in
Figure 4.4.
OXYGEN HOSE
TO OXYGEN SUPPLY
CLIP ASSEMBLY
FLOW CONTROL
VALVE
STRAP
ASSEMBLY
HUMIDIFICATION
BOTTLE
TO DISPOSABLE
BREATHING MASK
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
Figure 4.4. Typical setup for Valve/Clip Assembly.
WARNING
Always connect the flow control valve fitting marked INLET to the mating
fitting on the oxygen hose and the fitting marked OUTLET TO PATIENT
to the humidifier bottle. Reversing these connections or use of a gas
source other than specified may result in inaccurate flow rates and
patient injury.
a. The flow control valve has male threaded connections for the inlet and outlet that are marked
accordingly. The inlet on the valve accepts the oxygen hose from the Container Assembly
and the outlet on the valve attaches directly to the humidification bottle.
b. The clip assembly is used to secure the combined flow control valve and humidification
bottle to the patient's litter or seat.
c. The retaining strap, of webbing and Velcro tape, wraps around both the humidification bottle
and the litter strap for stabilization and to eliminate swaying while in transit.
d. The adjustable knob on the flow control valve selects, from settings of 0 to 15 LPM, the
quantity of oxygen metered through the humidification bottle. Rotate the indexed control
knob to a detent position exposing the number representing a setting for oxygen, in LPM, to
be delivered to satisfy the prescribed patient requirement.
4.2.2.2 Humidification Bottle
The humidification bottle consists of an empty 300ml container and a humidifier adapter.
a. Remove the lid from bottle.
b. Fill the 300ml container with sterile water.
c. Replace the lid on bottle.
d. Connect the female threaded fitting on the humidifier adapter to the flow control valve outlet
fitting.
e. Push the flexible plastic tube from a disposable breathing mask or cannula over the outlet
tube fitting on the humidification adapter.
Note:
The maximum recommended flow with using a humidification bottle is 6
LPM.
4.2.2.3 Oxygen Hose
Three oxygen hoses, twenty feet long and stored on individual racks, are contained within the kit
assembly. Each hose has a female threaded connector on one end and a male quick disconnect fitting on
the other end. Remove the hose from its storage rack assembly before installing as indicated in the
following steps:
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CAUTION
The following sequence must be followed to prevent pressurized oxygen
from escaping from the Container Assembly through an open-ended
hose. Failure to do so will result in a reduction of available oxygen for
patients.
a. Remove the threaded dust cap from the flow control valve inlet port (see Figure 4.5).
Figure 4.5. Flow Control Valve.
b. Attach the threaded oxygen hose fitting end to the flow control valve inlet. Set the control
knob to zero (0).
c. Insert the hose quick disconnect fitting into any of the six quick disconnect ports located
below the sliding door at the top of the Container Assembly.
d. To disassemble, reverse the previous steps.
4.2.2.4 Schrader/DISS Adapter Fittings
Three Schrader to DISS adapter fittings are contained within the kit assembly. Each adapter
fitting is a male Schrader quick disconnect to a threaded male DISS connection.
a. Remove dust cap from the threaded end of the adapter fitting.
b. Attached an oxygen hose with two female threaded ends to the threaded end of the adapter
fitting.
Note:
Oxygen hoses with two female threaded DISS fittings ends are not
supplied with the accessory kit.
c. Remove the threaded dust cap from the flow control valve inlet port (see Figure 4.5).
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
d. Attach the other threaded oxygen hose fitting end to the flow control valve inlet. Set the
control knob to zero (0).
e. Insert the hose quick disconnect fitting into any of the six quick disconnect ports located
below the sliding door at the top of the Container Assembly.
f. To disassemble, reverse the previous steps.
4.2.3 Container Assembly
The Container Assembly combines the following items into a single, portable and transportable
unit: a liquid oxygen dewar, heat exchangers, relief valves, pressure regulating valves, outlet pressure
gauge, LOX quantity indicator, miscellaneous tubing and fittings, six quick disconnect outlet ports, and
tie down provisions.
a. Since this unit contains a vacuum insulated container, the following notice is applicable:
CAUTION
High Vacuum Container.
Handle With Care
WARNING
Stand clear of the Vent Port during filling.
b. The liquid oxygen filling procedure is as outlined in paragraph 4.4. Observe the warning of
"Overboard Vent" located above the vent port on the front panel of the Container Assembly.
c. Secure the Container Assembly in accordance with the applicable aircraft T.O. loading
instructions.
d. To facilitate transport and storage of the NPTLOX System, the Container Assembly is
provided with four latch fittings to interlock with mating strike fittings on the Accessory Kit
to couple the system into a single unit package.
CAUTION
Keep the Container Assembly sliding door closed at all times when the
Container Assembly is not in use to prevent entry of contamination
around the six oxygen outlet quick disconnect receptacles.
4.2.4 Operational Characteristics
Operational characteristics of the NPTLOX System are as follows and as shown in Figure 9.1,
9.2, and 9.3.
a. Filling the Container Assembly is accomplished by attaching the LOX servicing trailer filler
valve to the filler port of the fill, buildup and vent valve on the Container Assembly. When
attached, the servicing filler valve depresses the nosepiece and valve poppet of the fill,
Manual Part Number 50C-0083-0161 Rev G
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Essex Industries, Inc.
buildup and vent valve. This automatically puts the Container Assembly into the fill mode
(see Figure 9.1).
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
b. With the poppet depressed, the fill and vent ports of the fill, buildup and vent valve are
opened, and the buildup port is closed. This condition allows gas pressure build up in the
inner sphere to vent to the atmosphere. As pressure is vented, LOX in the servicing tank
(which is at a greater pressure, 30 to 40 PSIG,) flows through the fill, buildup and vent valve
and into the Container Assembly.
c. As the LOX level increases in the dewar, pressure created by vaporization of liquid due to
heat, turbulence, etc., is vented to the atmosphere. The Container Assembly is considered
full when a steady stream of LOX flows from the vent port.
d. When the Container Assembly is full and the servicing filler valve is disconnected, the
nosepiece and poppet of the fill, buildup and vent valve return to the extended position (see
Figure 9.2). This automatically puts the Container Assembly into the buildup and supply
mode by closing the fill and vent ports of the valve, and opening the buildup port.
e. In the buildup and supply mode (see Figure 9.2), LOX is forced out of the bottom of the
dewar and into the buildup coil by the weight of the liquid. As the LOX warms and
vaporizes into gaseous oxygen in the buildup coil, pressure is created. This pressure is
controlled at approximately 90 PSIG by the opening and closing action of the pressureclosing valve.
f. There is a bellows in the pressure-closing valve that responds to pressure. This bellows holds
the valve in the open position. As pressure builds, the bellows, which senses the increase,
contracts (at approximately 90 PSIG) and closes the valve.
g. Without a demand being placed on the container assembly, pressure continues to slowly rise.
If allowed to go unchecked, pressure in excess of 12,000 PSIG could be generated. To
prevent this potentially hazardous situation, a relief valve, which allows excess pressure to
exhaust through the Container Assembly vent port, is incorporated. The relief valve is set to
relieve excess pressure in the Container Assembly at a nominal pressure of 110 PSIG
concurrent with a nominal 225 PSIG burst disc.
h. As a demand is placed on the Container Assembly, LOX is forced into the buildup coil to
replace consumed oxygen. As this process is repeated, the LOX level in the dewar assembly
drops, increasing the void area in the head pressure space. As the size of the void area
increases, pressure decreases, and is sensed by the bellows in the pressure-closing valve.
When pressure falls below approximately 85 PSIG, the bellows expands, opening the valve.
With the valve open, pressure from the buildup coil passes through the valve and into the top
of the dewar assembly. This pressure again builds to approximately 90 PSIG and closes the
pressure-closing valve. This process is repeated as long as a demand is being placed on the
Container Assembly.
i. The oxygen supply travels from the dewar assembly, through the heat exchangers, then
through the pressure regulator, and out the Container Assembly through the outlet ports into
the oxygen hoses (see Figure 9.3).
Manual Part Number 50C-0083-0161 Rev G
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Table 4-1. Container Assembly Duration.
Liters of
LOX
Liters of
Gas
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
17,200
16,340
15,480
14,620
13,760
12,900
12,040
11,180
10,320
9,460
8,600
7,740
6,880
6,020
5,160
4,300
3,440
2,580
1,720
860
Duration of Remaining Oxygen Supply in Minutes
Patients
4
3
2
1
287
382
573
1,147
272
363
545
1,089
258
344
516
1,032
244
325
487
975
229
306
459
917
215
287
430
860
201
268
401
803
186
248
373
745
172
229
344
688
158
210
315
631
143
191
287
573
129
172
258
516
115
153
229
459
100
134
201
401
86
115
172
344
72
96
143
287
57
76
115
229
43
57
86
172
29
38
57
115
14
19
29
57
Note: Duration values based on flow rate to each patient of 15 LPM at 14.7 PSIA and 70F (21C).
4.3
Supplemental Equipment
The Silicon Adult Resuscitator (2500 ml) by Laerdal and Uni-Vent 754 Ventilator by Impact are
the only supplemental equipment that has been tested and approved for use with the NPTLOX System.
4.3.1 Resuscitator
Additional equipment authorized to be used with NPTLOX, but not a part of the Accessory Kit
(see section 4.2.2), the Laerdal Silicon Adult 2500 ml Resusitator (see Figure 4.6). Laerdal resuscitator
is not supplied with the NPTLOX System.
Figure 4.6. Silicon Adult Resuscitator.
18
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
a. Remove a flow control valve and oxygen hose from the accessory kit.
b. Remove the threaded dust cap from the flow control valve inlet port (see Figure 4.5).
c. Attach the threaded fitting end of the oxygen hose to the flow control valve inlet. Set the
control knob to zero (0).
d. Insert the hose quick disconnect fitting into any of the six quick disconnect ports located
below the sliding door at the top of the Container Assembly.
e. Assemble the resuscitator if needed.
f. Remove the threaded dust cap from the flow control valve outlet port.
g. Attach the hose from the resuscitator to the outlet port on the flow control valve. Adjust the
flow control knob to the desired flow rate.
h. To disassemble, reverse the previous steps.
Note:
One NPTLOX System can support up to three Laerdal Resuscitators
with a maximum of 15 LPM per resuscitator.
4.3.2 Uni-Vent “Eagle” Model 754M Ventilator by Impact
Additional equipment authorized to be used with NPTLOX, but not a part of the Accessory Kit
(see section 4.2.2), the Uni-Vent 754 Ventilator by Impact (see Figure 4.7). The Impact 754 ventilator is
not supplied with the NPTLOX System.
Figure 4.7. Uni-Vent 754 Ventilator by Impact.
a. Remove an oxygen hose from the accessory kit.
Manual Part Number 50C-0083-0161 Rev G
19
Essex Industries, Inc.
b. Attach the oxygen hose to the top of the ventilator (see Figure 4.8).
Exhalation Valve Port
Transducer Port
Power Connection
Oxygen Hose Connection
Gas Outlet to Patient
Figure 4.8. Top of the Uni-Vent 754 Ventilator by Impact.
c. Insert the hose quick disconnect fitting into any of the six quick disconnect ports located
below the sliding door at the top of the Container Assembly.
d. Connect the disposable ventilator hose to the gas out connection on top of the ventilator.
Plug the transducer and exhalation valve cables into their appropriate ports on the ventilator
(see Figure 4.8).
e. Connect the appropriate power cable to the ventilator and the power source.
f. Refer to Air Force document AFI41-309 (Aeromedical Evacuation Equipment Standards) for
complete setup and operation instructions for the 754 ventilator by Impact.
Note:
Two ventilators can be connected to one NPTLOX System when using
the following recommended settings.
 Tidal Volume: 550 ml (milliliters)
 Rate: 20 BPM (Breaths per Minute)
 FiO2: 100%
 I:E Ratio of 1:2
Note:
If the ventilators are set at higher tidal volumes, it is recommended that
one ventilator be used per NPTLOX System.
20
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
CAUTION
If two ventilators are used with one NPTLOX, at higher tidal volumes,
pressure on the NPTLOX can drop which will not provide adequate flow
needed to operate the ventilator.
4.4
Servicing the NPTLOX System
Refer to servicing equipment for instruction on proper use.
4.4.1 Servicing Instructions
To service the NPTLOX System with liquid oxygen proceed as follows:
WARNING

LOX will freeze and seriously damage human skin tissue upon
contact.

Do not allow LOX to contact petroleum products as fire or explosion
may result.

Personnel handling liquid oxygen must wear all required protective
clothing and devices.

Only personnel fully trained and qualified in handling and servicing
liquid oxygen are authorized to service the NPTLOX System.

No smoking or operation of any internal combustion engine,
electrical motor, ground heater or open flame is permitted within 50
feet of the container assembly being serviced with oxygen.

Stay clear of the liquid oxygen vents and/or openings during
servicing.

Stand to one side when disconnecting the liquid oxygen servicing
transfer nozzle and/or hose to avoid possible liquid oxygen contact.

The NPTLOX System must be located at least 50 feet from the
nearest structure, in a well-ventilated area, free from grease, oil, and
other highly combustible materials and vapors when servicing unless
building is used for that purpose only.

Drip pans shall be kept clean and not be utilized for any purpose
other than LOX servicing. Any residual LOX in the drip pan should
be allowed to boil off and not be poured off.
a. Those persons not directly involved in oxygen servicing operations shall stay outside a 25foot radius of the liquid oxygen servicing area. Servicing personnel will ensure that their
hands, feet, clothing, etc., are clean and free of petroleum-based products.
Manual Part Number 50C-0083-0161 Rev G
21
Essex Industries, Inc.
Note:
 The following NSN data is for gloves sized "medium." Other
sizes may be ordered as required, but all sizes must meet the
criteria of the federal specification and military specification
identified.
 A BDU cap is recommended as head covering when LOX
servicing connections are above eye level since it would afford
more protection than the adjustable style cap with open back,
typically worn as organizational head covering. Mesh caps are
not authorized.
 The wool glove insert and cotton knit cloth work gloves used as
inserts can be used interchangeably with either welders gauntlet
cuff leather gloves or leather gloves as specified below.
 A leather boot approximately 8 inches in height with close fitting
top and neoprene sole and heel is recommended, since a LOX
spill can subject the feet of servicing personnel to a freeze burn
exposure hazard. This type footwear when equipped with a hard
protective toe area is generally classified as a safety shoe or
boot.
b. Approved protective clothing and equipment: When transferring LOX, personnel shall wear
head covering, face shield (NSN 4240-00-542-2048), gloves, leather, welder's gauntlet cuff
(Federal Specification KKG486, Type II) (NSN 8415-00-268-7860) medium with gloves,
cloth, work, cotton knit (MIL-G-1057E) (NSN 8415-00-964-4760) medium as an insert; or
gloves, leather (NSN 8415-00-268-7871) with glove inserts, wool (NSN 8415-00-682-6673),
apron (NSN 8415-00-082-6108), coveralls, cotton white (Mandatory) (NSN 8405-00-0379274), cuff less trousers, long sleeve shirt, jacket, (Optional) and shoes which fit closely
around the top, with rubber soles and heels. All items shall be clean and free of grease, oil,
and fuel.
c. Position the NPTLOX System on a stable clean surface with the servicing fill valve down
wind.
d. Static ground the NPTLOX System by connecting it to an approved earth ground connector.
e. Position an aircraft type fire extinguisher up wind approximately ten (10) to fifteen (15) feet
from the NPTLOX System.
f. Ascertain that the vent openings of both the LOX servicing tank and the NPTLOX System
are unobstructed.
g. Locate the NPTLOX System fill port and remove the valve dust cap.
h. Inspect the opening of the NPTLOX System fill valve and the servicing hose fill valve for
contamination or moisture. Remove any contamination or moisture with a dry clean lint-free
cloth.
22
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
i. Vent the NPTLOX System until flow ceases at the vent port by affixing a vent cap, Essex
Part No. 50C-0020-1 (see Figure 1.2) or a spare female filler adapter or equivalent accessory
device to the system fill valve. This indicates that the system head pressure is depleted.
j. Pressurize the LOX servicing tank to 35 ± 5 PSIG in accordance with its instructions.
k. Connect the filler valve for the servicing hose to the purge adapter on the side of the LOX
servicing cart.
l. Purge the servicing hose until liquid oxygen flows from the hose female fill valve. This
purging procedure shall be accomplished each time a Container Assembly is to be filled.
Note:
Maintain a pressure of 35  5 PSIG in the servicing hose. The NPTLOX
System is full when a steady stream of LOX flows from the vent port.
m. Immediately after purging the servicing hose, remove the vent cap and connect the servicing
hose filling adapter to the NPTLOX System fill valve and proceed to fill in accordance with
the instructions for the servicing tank.
n. Leakage from any component or connection is a potentially dangerous situation. Any steady
drip from the servicing nozzle that can be contained in the drip pan of the system is
acceptable. Dripping can sometimes be eliminated by holding the hose, thereby removing
any downward tension from the connections.
WARNING

To prevent excessive pressure buildup in the servicing hose and
possible injury to personnel, ensure that the LOX servicing hose is
fully depressurized. Open the servicing line pressure relief valve if
the LOX servicing tank is so equipped.

After filling, allow the Container Assembly to temperature stabilize for
a minimum period of thirty (30) minutes prior to transporting or
loading in or on any vehicle or aircraft.
Note:
Under standard servicing conditions the NPTLOX System should reach
maximum capacity within 10 to 15 minutes.
o. While the NPTLOX System is being filled, periodically press the “LOX QTY” button on the
quantity indicator to observe whether the LOX quantity is increasing. The quantity indicator
will not display an accurate reading though due to turbulence caused during the filling
process.
p. When a continuous stream of LOX flows from the vent port of the NPTLOX System into the
drip pan, close the servicing hose shutoff valve, vent the servicing hose, and disconnect the
servicing hose from the system in accordance with the instructions for the servicing tank.
Manual Part Number 50C-0083-0161 Rev G
23
Essex Industries, Inc.
q. Re-install the valve dust cap on the NPTLOX System fill valve.
p. Record any servicing data as necessary.
4.5
Operation Instructions
To operate the NPTLOX System proceed as follows:
a. Read the following special precautions and warnings on handling oxygen.
WARNING

Only personnel fully trained and qualified in the operation of the
NPTLOX System are authorized to use this equipment.

All safety precautions contained in pertinent directives will be
observed at all times when using this equipment.

Keep away from exposure to oil and grease. Do not handle oxygen
with greasy hands or clothing. Do not let fittings, hoses, or any
oxygen equipment come in contact with oil, grease, hydraulic fluid or
dirt.

Never allow the unit vent port to be obstructed. The vent port must
remain open at all times.

When oxygen equipment is in use, keep in a well-ventilated area
away from all gasoline, kerosene, oil, grease, and other
hydrocarbons. These substances are not compatible with liquid or
gaseous oxygen.

Keep oxygen away from open flame. A small flame in the presence
of oxygen can quickly flare up and become uncontrolled.

Do not place the NPTLOX System where it may come in contact with
petroleum products as fire and/or explosion may result.
Note:
A hissing sound is normal when the Container Assembly is venting and
should be no cause for concern.
b. Position the NPTLOX System where it is intended to be used. If the NPTLOX System is to
be used on an aircraft, secure the system to the aircraft cargo floor with the tie down straps.
c. Perform quantity indicator battery checkout as described in paragraph 2.4, to ensure proper
strength level.
d. Check the LOX quantity by actuating the "LOX QTY" button (see Figure 2.1). See Table 41, Container Assembly Duration, to determine if the Liters of LOX meets the anticipated
medical requirements.
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
Note:
The pressure indicated on the outlet pressure gauge should be within
the green zone (45 to 55 PSIG) during use. The pressure can indicate
as high as 62 PSIG while in standby with no flow.
e. Check the Container Assembly outlet pressure gauge (see Figure 4.2) for the proper amount
of pressure.
f. Open the access door to expose the oxygen outlet disconnect ports.
g. Remove the required oxygen hoses from the accessory kit.
WARNING
Prior to connecting an oxygen hose to an outlet port, a flow control
valve, with the control knob set at zero (0), must be attached to the
mating hose fitting. This step is imperative to prevent pressurized
oxygen from escaping out an open-ended hose.
h. Attach the flow control valve fitting marked “INLET” to the mating oxygen hose fitting and
set the control knob to zero (0).
i. Remove dust plugs, as required, from the outlet disconnect ports by turning the receptacle
knurled collar clockwise and extracting the plug.
j. Insert the oxygen hose quick disconnect fitting into one of the six unplugged outlet ports.
Note:
If any odors other than the normal hose smell are detected, have other
personnel recheck to detect odors. If odor persists, replace the hose.
k. Turn the flow control valve knob to the fifteen (15) LPM marking and check that the oxygen
delivery pressure indicated on the outlet pressure gauge does not fall below 45 PSIG. Smell
for any odors emitted from the oxygen flow at the outlet of the flow control valve.
l. Turn the flow control valve knob back to the zero flow setting.
m. Assemble the humidification bottle by filling the 300ml container with sterile water and
attaching it to the humidifier adapter.
n. Attach the flow control valve fitting marked “OUTLET TO PATIENT” to the mating fitting
on humidifier adapter. Ensure that the oxygen flow is in the proper direction.
o. Connect patient oxygen mask or cannula to the outlet tube fitting of the humidifier adapter.
Manual Part Number 50C-0083-0161 Rev G
25
Essex Industries, Inc.
p. Install the mask or cannula on the patient as required. Oxygen may be administered by
adjusting the flow control valve knob to the following settings: 0, 0.5, 1, 2, 3, 4, 5, 6, 8, 10,
12 and 15 liters per minute when supply pressure is at 50 ± 5 PSIG (green zone on the outlet
pressure gauge). See Table 4-1, Container Assembly Duration, to determine the duration for
the flow setting.
q. Disassemble the NPTLOX System in the reverse order of assembly.
r. Record any items missing or discrepancy on the appropriate forms.
s. If repairs are required, route the system to the appropriate repair facility.
4.6
Liquid Oxygen Draining
Drain all LOX from the Container Assembly before purging the system, upon occurrence of
system malfunction, failure of system to pass inspection, when placing Container Assembly in storage or
shipping, or when performing maintenance. To drain LOX proceed as follows:
a. Place the Container Assembly in an area free from dirt and hydrocarbons.
b. Attach the flow control valves only, without humidifier bottles, to the three oxygen hoses.
WARNING
Prior to connecting an oxygen hose to an outlet port, a flow control
valve, with the control knob set at zero (0), must be attached to the
mating hose fitting. This step is imperative to prevent pressurized
oxygen from escaping out an open-ended hose.
c. Set all the flow control valves to the zero (0) flow setting.
d. Insert each of the oxygen hose male quick disconnects into a Container Assembly outlet
disconnect port.
e. Set the three flow control valves to the maximum flow setting of 15 LPM. The total flow
will be 45 LPM.
Note:
Do not connect more than four flow control valves set to 15 LPM to drain
the system.
f. Drain time for the full 20 liter LOX capacity of the system, with three flow control valves set
at the maximum rate, will be approximately 6 hours. This is based on a flow rate of 45 LPM.
The maximum flow rate for the NPTLOX System is 66 LPM. Therefore attaching one more
flow control valve will reduce the drain time approximately one and one half hour with a
total flow rate of 60 LPM. See Table 4-1 Container Assembly Duration.
g. When draining is complete, disconnect the oxygen hoses from the system and insert the dust
plugs into their respective Container Assembly outlet disconnect port.
26
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
4.7
Purging
4.7.1 Conditions of Purging
Purging shall be accomplished when any of the following conditions occur:
a. Prior to storage.
b. If the NPTLOX System has not been stored in an environment in which the temperature and
humidity are within 77  28F and 50  30% RH respectively and the positive pressure
indicated on the outlet pressure gauge falls below 5 PSIG.
Note:
If at any time it is believed that the NPTLOX System has become
contaminated and the positive pressure is below 5 PSIG, purging should
be accomplished prior to use.
4.7.2 Purging Instructions
To purge the Container Assembly proceed as follows:
WARNING
Only gaseous nitrogen conforming to Type I, Grades A or B, Class 1 of
A-A-59503 will be used as a source for purging.
WARNING
While operating purging unit, protective gloves must be worn by the
operator. Discharge fittings can reach temperature that will cause
severe burns if grasped with bare hands.
a. Ascertain the Container Assembly has been drained as described in paragraph 4.6 or has been
completely emptied of LOX during use.
b. Attach the flow control valves only, without humidifier bottles, to the three oxygen hose
assemblies and turn the control knobs to the 5 LPM flow setting (15 LPM total).
c. Insert each oxygen hose male quick disconnect into a Container Assembly outlet disconnect
port.
d. The following equipment or one of equivalent capacity and performance is required: Purge
Kit, Converter System, Liquid Oxygen, Essex Part No. 50C-0001-1. Figure 4.9 shows a
typical setup for the purge kit.
Manual Part Number 50C-0083-0161 Rev G
27
Essex Industries, Inc.
Figure 4.9. Purge Kit Setup.
e. With the Container Assembly and a purge heater positioned on a clean work area, connect
the approved nitrogen source product, equipped with a shutoff valve and regulator capable of
controlling the source pressure from 50 to 100 PSIG, to the inlet of the purge heater.
f. Using the female filler adapter provided with the purge kit, connect the outlet of the purge
heater to the Container Assembly fill port. Plug the power cable from the purge heater into
an electrical outlet providing a source of 115 volts AC, 60-400 cycles with an outlet rating of
500 watts or more.
g. Open the gaseous nitrogen source shutoff valve and adjust the source inlet pressure to
approximately 55 PSIG. Turn the purge heater power switch on. Purging gas should begin
to exhaust from the Container Assembly vent port and from the three flow control valves.
Note:
Place your hand within the exhaust stream coming from the vent port to
determine whether the exhaust temperature is slightly above the
surrounding air temperature.
h. Continue to hot purge for a minimum of 45 minutes until the exhaust temperature is slightly
above ambient temperature.
i. Turn the purge heater off and cold purge for at least 15 minutes.
j. Ascertain that the exhaust temperature at the vent port is equal to or slightly below ambient
temperature. If not, additional cold purging will be required.
k. Set the flow control valves to zero.
l. Disconnect the purge heater filler adapter from the Container Assembly fill port, trapping
pressure inside the system.
28
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
m. Turn the purging source off, then disconnect and properly store all purging appliances.
n. Disconnect the oxygen hose assemblies from the Container Assembly and insert the dust
caps back into their respective outlet disconnect port.
o. Separate the flow control valves from the oxygen hoses, reinstall all protective dust caps, and
then properly store the components into their respective locations in the kit assembly.
p. Replace the fill port dust cap.
q. Check for continuity between the Container Assembly static ground connector and fill port
valve. Resistance shall measure less than ten (10) ohms.
Manual Part Number 50C-0083-0161 Rev G
29
Essex Industries, Inc.
5.0
MAINTENANCE AND SERVICING INSTRUCTIONS
5.1
Maintenance Plan
Two levels of maintenance are planned for the NPTLOX System, Organizational-Level
(O-Level) and Depot-Level (D-Level). O-Level maintenance will involve the specific career field of
Biomedical Equipment Technicians (BMETs) (AFSC 4A2X1). The NPTLOX System is designed so
that O-Level maintenance can be accomplished by a technician no higher than skill level five
(journeyman). D-Level maintenance will be the responsibility of the Original Equipment Manufacturer
(OEM), Essex Industries, Inc.
O-Level Maintenance – The O-Level maintenance tasks (preventative and corrective) (see
Table 5-1) will be performed by BMET personnel.
D-Level Maintenance – Each NPTLOX System is to be returned to the OEM on a 36-month
cycle for scheduled maintenance. This routine preventative maintenance (PM) cycle will reduce OLevel maintenance requirements and allow for maintenance data collection and analysis. The NPTLOX
System is also to be returned to the OEM for any corrective maintenance (CM) that is needed and not
permitted by O-Level maintainers.
Table 5-1. O-Level Tasks.
PREVENTATIVE MAINTENANCE TASKS
Check Pressure (90-day period) – If less than 5 psi then purge and refill (see paragraph 4.7.2).
Battery Check (90-day period) – Replace batteries if needed (see paragraph 2.4)
CORRECTIVE MAINTENANCE TASKS
Battery Replacement – See paragraph 5.4.2
Leak Detection – See paragraph 5.11.1
5.2
Tools and Equipment
Only common tools are required to maintain the NPTLOX System. The recommended support
equipment required is listed in paragraph 1.9.
5.3
Service Life
The NPTLOX System can remain in service as long as the system continues to function properly.
5.4
Field Maintenance
The following maintenance tasks have been identified that can be accomplished within the field.
5.4.1 Accessory Kit
To maintain the accessory kit proceed as follows:
a. Clean the interior of the accessory kit with a clean, dry, oil and lint free cloth.
b. Attach the threaded fitting of the oxygen hoses to the mating swivel fitting on the storage
rack assemblies and rewind. Stow the assemblies in the provided storage slot.
c. Replace any missing or used humidification bottles.
30
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
d. Secure the dust caps to the flow control valve inlet and outlet ports and stow the assemblies
in the provided storage location.
e. Secure dust caps to the Schrader adapter fittings and stow in the provide storage slot.
f. Check the general condition of the handle, latches and hinges of the accessory kit for proper
operation.
5.4.2 Quantity Indicator Battery Replacement
To replace batteries in the Quantity Indicator proceed as follows.
a. Remove the battery compartment access panel on the face of the quantity indicator by
removing the four panel retaining screws (see Figure 2.1). Retain the screws.
b. Remove the wire leads from the batteries.
c. Remove the batteries from the battery clips.
d. Insert two new 9-volt lithium batteries (NSN 6135-01-369-9792) into the battery clips.
e. Attach the wire leads to the new batteries.
f. Press the “TEST” button and check the value displayed. The reading should be between
“10.0” to “16.0”.
g. Reinstall the battery compartment access panel.
h. Install the four access panel retaining screws.
5.4.3 General Inspection
Inspect the NPTLOX System operational units at least once a month. When performing general
inspections, check the following:
a. Check both the Container Assembly housing and the Accessory Kit case for any damage that
could possibly affect the system performance, such as: missing components, severe dents,
missing fasteners, broken or damaged latches and tie downs, cracked or broken lens on the
outlet pressure gauge, or any visible damage to the quantity indicator.
b. Check the drip pan for any dirt, debris or hydrocarbons that could cause a potential hazard
during filling.
c. Check the quantity indicator display and battery condition by actuating the “TEST” and
“LOX QTY” buttons.
d. Check the Container Assembly sliding door, covering the outlet ports, for smooth and
positive operation.
Manual Part Number 50C-0083-0161 Rev G
31
Essex Industries, Inc.
e. Check the Container Assembly outlet ports for general condition, for smooth and positive
action, freedom from contamination, that protective dust covers are installed and for
cleanliness of the surrounding area.
f. Check Accessory Kit contents for three each of the flow control valve assemblies, oxygen
hoses on racks, Schrader/DISS adapter fittings, and humidification bottles.
g. Check the flow control valves for cleanliness and for smooth operation of the control knob
through its entire setting range.
h. Check the oxygen hoses for end fitting condition, excessive hose wear and flexibility,
obvious physical damage and cleanliness.
i. Check the humidification bottles for the 300 ml container and screw on cap assembly for
obvious physical damage and cleanliness.
j. If any condition exists from the preceding inspection steps that make the system unable to
perform its intended function, return the system to the appropriate repair facility for
corrective action.
5.4.4 Cleaning
Field level cleaning will be limited to the external cleaning of all NPTLOX System surfaces. No
cleaning is to be performed on-board any aircraft.
a. Clean the surfaces with a soft lint free cloth using a solution of soap and water. For harder to
remove soil, use a soft nylon brush to scrub the external surfaces.
b. Rinse in clear water and either wipe dry with lint free clothes or blow dry as necessary with
gaseous nitrogen conforming to Type I, Grade A or B, Class 1 of A-A-59503.
5.4.5 Inspection After Dropping Unit
In the event that the system is dropped in the field, the operator (Flight Nurse/Aeromedical
Technician) will take the following steps to ensure there are no problems:









32
Inspect the drip pan for dents, cracks or punctures.
Inspect the unit and ground for any evidence of liquid oxygen leakage.
Listen for any whistling or hissing sounds coming from the unit. (Note: Some hissing could
be present due to venting of the relief valve from pressure buildup caused during the drop.)
Check all four sides of the unit for dents, cracks or punctures.
Check for loose or dislodged handles.
Check the quantity indicator for damage and proper operation (see paragraph 4.2.1).
Connect a flow control valve and oxygen hose to one of the outlet ports (see paragraph
4.2.2.3).
Turn the flow control valve knob to the fifteen (15) LPM setting and ensure oxygen is
flowing. Check the outlet pressure gauge for correct pressure indication (see paragraph
4.2.1).
Turn the flow control valve knob to the zero (0) setting.
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.

Disconnect the flow control valve and oxygen hose from the Container Assembly and
properly stow the components in the Accessory Kit.
If no problems are found:

If no problems are found, use the unit as specified in Section 4.0 of this manual.
If problems are found:


Replace with another unit.
If another unit is not available, contact the nearest Mobile Aeromedical Staging Facility
(MASF), Aeromedical Evacuation Liaison Team (AELT) if at the pick-up location, or the
Aeromedical Evacuation Control Team (AECT).
At the end of the mission:

At the end of the AE mission ensure the dropped unit is sent to a qualified BMET for proper
inspection and/or repairs.
5.5
Troubleshooting
The following table is a listing of possible troubles that may be encountered during operation, the
possible cause, and the recommended remedies that must be taken to isolate and correct the trouble.
Table 5-2. NPTLOX System Troubleshooting Procedures.
Trouble
Container Assembly will not fill.
Container Assembly does not fill
in required time.
Probable Cause
Ice in filler valve or filler line
obstructs LOX flow.
Restricted filter on 50 gallon LOX
cart.
Filler line not properly purged
prior to filling.
Container Assembly not subcooled before filling.
Filling pressure too low.
Defective Container Assembly.
Restricted filter on 50 gallon LOX
cart.
Frost collects on entire outer
jacket of the Dewar & Manifold
Assembly.
Container Assembly will fill only
partially (gas only emitted from
vent).
Container Assembly will not build
up pressure.
Heat loss due to annular space
leakage.
Container Assembly not subcooled prior to filling.
Fill, Buildup and Vent Valve
defective, or partially open
Pressure relief valve open
Remedy
Thaw filler valve / filler line.
Use different LOX cart or contact
individuals responsible for
maintenance of the LOX cart.
Purge and cool filler line.
Lower pressure in servicing
trailer and sub-cool Container
Assembly.
Increase pressure to 355 psi at
Container Assembly inlet.
Replace NPTLOX System.
Use different LOX cart or contact
individuals responsible for
maintenance of the LOX cart.
Remove and replace Dewar and
Manifold Assembly or return
NPTLOX System to OEM.
Lower pressure in servicing
trailer and sub-cool Container
Assembly.
Thaw valve, remove and replace
valve, or return NPTLOX System
to OEM.
Thaw valve, remove and replace
valve, or return NPTLOX System
to OEM.
Manual Part Number 50C-0083-0161 Rev G
33
Essex Industries, Inc.
Trouble
Oxygen supply consumed too
quickly.
Probable Cause
Container Assembly not
completely filled during filling
operation.
System leakage.
Fill, buildup and vent valve
partially open venting gas.
Flow control valve out of
calibration.
Filler line cannot be disconnected
from filler valve.
Low, or no Container Assembly
pressure.
System leakage.
Pressure closing valve out of
adjustment.
Dewar Assembly empty,
defective probe or quantity
indicator.
Quantity Indicator indicates
empty.
5.6
Filler nozzle frozen to filler valve.
Quantity Indicator – no reading
Dead batteries.
LOX Dewar Assembly
contaminated.
Undesirable odors or moisture.
Remedy
Refill Container Assembly (see
paragraph 4.4.1).
Locate and repair leaks (see
paragraph 5.11.1).
Thaw valve.
Test and replace flow control
valve as necessary (see
paragraph 5.11.7).
Thaw nozzle.
Locate and repair leaks (see
paragraph 5.11.1).
Remove and replace valve or
return NPTLOX System to OEM.
Refill, remove and replace
quantity indicator batteries or
indicator, or return NPTLOX
System to OEM.
Replace quantity indicator
batteries (see paragraph 5.4.2).
Purge Container Assembly (see
paragraph 4.7.2).
Disassembly of the Container Assembly
The following guidelines should be observed during any disassembly of the Container Assembly.
a. During disassembly, cleaning and inspection, insure that the working tools and environment
are maintained in a high state of cleanliness.
b. Drain the Container Assembly of LOX and purge the unit prior to performing any work that
requires disassembly of tubing and valves.
Note:
Refer to the Section 8.0, Parts List, during disassembly and reassembly
of the Container Assembly.
c. Proceed as follows to achieve access to the inside of the Container Assembly.
1. Remove the socket head cap screws (Figure 8.3, Index No. 26) securing the feet (Figure
No. 8.3, Index No. 17) to the bottom of the Container Assembly and remove the drip pan
(Figure No. 8.3, Index No. 16).
2. For access into the front of the Container Assembly, remove the countersunk screws
(Figure 8.3, Index No. 80) retaining the front panel assembly (Figure 8.3, Index No. 13).
3. Carefully pull the front panel away from the Container Assembly until sufficient space is
available to loosen the coupling nut securing the vent hose (Figure No. 8.3, Index No. 10)
to the vent fitting (Figure 8.3, Index No. 69).
34
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
4. For access into the rear of the Container Assembly, remove the countersunk screws
(Figure No. 8.3, Index No. 80) retaining the rear panel assembly (Figure 8.3, Index No.
12).
CAUTION
Be sure to hold fittings in place when loosening tube nuts in order to
prevent damage to the tubing.
d. Remove tube assemblies as required to gain access to the components that require removal
for testing, repair or replacement.
e. Refer to the figures in Section 8.0 during disassembly for identification of each component.
5.7
Cleaning
Note:
Do not clean any of the valves, outlet ports, pressure regulator, pressure
gauge, quantity indicator, cable assemblies or dewar and manifold
assembly.
a. Clean all metal connectors, couplings, fittings and tubing with trichlorotrifluoroethane
cleaning compound conforming to Type I of MIL-C-81302 or approved equivalent. Do not
soak for a prolonged period. Flush through small diameter holes using polyethylene squeeze
bottle containing cleaning compound. Rinse in clear water and blow dry as necessary with
gaseous nitrogen conforming to Type I, Grade A or B, Class 1 of A-A-59503.
b. Clean remaining components such as the case and panels in a solution of soap and water.
Rinse in clear water and either wipe dry with lint free clothes or blow dry as necessary with
gaseous nitrogen conforming to Type I, Grade A or B, Class 1 of A-A-59503.
c. Remove all anti-seize tape from threaded fittings to prevent entry of tape particles into the
system.
5.8
Inspection
a. Inspect all hardware items for stripped threads, burrs, nicks, distortions, rust or other defects.
b. Inspect major components and parts as described in the Inspection Table (Table 5-3).
c. Inspect tube assemblies for evidence of binding or other damage that could hamper or restrict
flow. Dented places on tube assemblies shall not be smoothed superficially. Tube
assemblies with insignificant dents that do not cause flow restrictions will be considered
serviceable. Small scratches, abrasions and nicks on the exterior surfaces of tubes will be
burnished with burnishing tool or aluminum wool prior to cleaning.
Manual Part Number 50C-0083-0161 Rev G
35
Essex Industries, Inc.
Table 5-3. Inspection Table.
36
Figure No.
8.1
8.1
8.1
Index No.
1
2
3
Nomenclature
Accessory kit assembly
Container assembly
Shipping container
8.1
8.1
8.1
8.2
4
5
6
1
Identification plate
Manual
Storage pouch
Valve/clamp assembly
8.2
8.2
2
3
Humidifier bottle
Hose assembly
8.2
8.2
4
5
Rack assembly
Case assembly
8.2
8.2
8.3
8.3
7
8
1-2,27,39,
40-42,6366,69-73
3
8.3
4
Check valve
8.3
5-6
Relief valve
8.3
8.3
7
8
Guide
Quantity indicator
8.3
9
Slow fill port
8.3
10-11
8.3
12
Rear panel assembly
8.3
13
Front panel assembly
Identification plate
Schrader adapter
Elbows, fittings and tees
Pressure closing valve
Hose assembly
Inspection Criteria
See paragraph 5.4.1.
See paragraph 5.4.3.
Replace if there is evidence of damaged
and/or missing hardware that would prevent
safe stowage of the NPTLOX System for
shipment.
Replace if damaged or data is illegible.
Replace if any data is illegible.
Replace if damaged.
Replace if valve fails to pass testing in
paragraph 5.11.7. Replace if clip assembly
shows evidence of corrosion or damage or is
missing.
Replace if used or missing.
Replace if the hose assembly shows any
evidence of cuts and/or nicks or if there is
damage to the end connections.
Replace if there is evidence of damage.
Replace if there is evidence of damaged,
loose or missing hardware
Replace if damaged or data is illegible.
Replace if sealing surface is worn.
Inspect for stripped threads, scratched or
nicked sealing surfaces and damage due to
use of improper tools.
Replace if valve fails to pass testing in
paragraph 5.11.5.
Replace if there is evidence of damage to the
threads.
Replace if valve fails to pass testing in
paragraph 5.11.6.
Replace if damaged or distorted.
Replace if indicator fails to pass testing in
paragraph 5.11.10 or display is damaged.
Replace if there is evidence of corrosion or
binding of the collar.
Replace if there is evidence of leakage or
damage.
Replace if there is evidence of corrosion,
cracks, damaged and/or missing handle,
latches or threaded inserts.
Replace if there is evidence of any of the
following conditions:
- Panel is corroded, cracked or severly
dented.
- Panel has loose or missing handle or
pouch snaps.
- Panel has damage or missing threaded
inserts.
- Panel is missing labeling for drip pan
warning, grounding and vent port.
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
Figure No.
8.3
Index No.
14
Nomenclature
Wraparound panel assembly
8.3
15
Bottom panel assembly
8.3
8.3
8.3
16
17
18
Drip pan
Foot
Spacer
8.3
19
Fill port housing assembly
8.3
20
Outlet housing assembly
8.3
21
Door assembly
8.3
22
Pressure gauge
8.3
23
Manifold assembly
8.3
24
Support assembly
8.3
25
Heat exchanger
8.3
26
Shoulder screw
8.3
28
Pressure regulator
8.3
29
Dewar & manifold assembly
8.3
30
Mount assembly
8.3
31-38,53,56
Tube assemblies
8.3
43
Bracket assembly
8.3
44
Bracket assembly
8.3
8.3
45-46
47
8.3
48
Spacer
8.3
49
Bracket assembly
Cable assemblies
Dust cover assembly
Inspection Criteria
Inspect strap assemblies for tightness,
fraying or tearing. Inspect hook assemblies
for corrosion or other damage. Inspect latch
assemblies for corrosion or damage.
Replace the panel assembly for any of the
above conditions.
Inspect the assembly for any missing or
damaged inserts. Replace the panel
assembly for any of the above conditions.
Replace if corner seams are split or cracked.
Replace if cracked or severely worn.
Replace if there is evidence of corrosion or
damage to threads.
Replace if there is evidence of corrosion,
cracks or damaged and/or missing threaded
inserts.
Replace if there is evidence of corrosion,
cracks or damaged and/or missing threaded
inserts.
Replace if there is evidence of corrosion or
damage.
Replace if gauge fails to pass testing in
paragraph 5.11.8 or dial face is damaged.
Replace if there is evidence of corrosion,
leakage or damage to the threaded
connections.
Replace if there is evidence of corrosion,
cracks or damaged and/or missing threaded
inserts.
Replace if there is evidence of corrosion,
leakage or damaged connections.
Replace if there is sever damage to the head
or threads.
Replace if regulator fails to pass testing in
paragraph 5.11.9.
Replace if the Container Assembly fails to
pass testing in paragraphs 5.11.1 or 5.11.3.
Replace if there is evidence of corrosion,
cracks or damaged and/or missing threaded
inserts.
Replace if there is evidence of cracked flares,
damaged nuts and/or sleeves or leakage.
Replace If there is evidence of corrosion,
cracks or damaged and/or missing threaded
inserts.
Replace If there is evidence of corrosion,
cracks or damaged and/or missing threaded
insert.
Replace if cut or nicked.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion,
cracks or damaged and/or missing threaded
insert.
Manual Part Number 50C-0083-0161 Rev G
37
Essex Industries, Inc.
Figure No.
8.3
Index No.
50
8.3
51
8.3
8.3
8.3
8.3
52
54-55
57
58
Tube
Spacer
Shrink tubing
Fill, buildup and vent valve
8.3
59-62
Flat washer
8.3
67-68
Bulkhead nut
8.3
74-76,102
Cushioned clamp
8.3
77
Female filer valve
8.3
78-79
Self-locking nut
8.3
80-83
Countersunk screw
8.3
84-86
Hex head screw
8.3
87-88
Lock washer
8.3
89-97
Pan head screw
8.3
8.4
98-101
2
Spacer
Burst disc
5.9
Nomenclature
Vaporizer
Boiler assembly
Inspection Criteria
Replace if there is evidence of corrosion,
leakage or damage to threads.
Replace if there is evidence of corrosion,
cracked solder joints, leakage or loose and/or
missing clamps.
Replace if there is evidence of leakage.
Replace if there is evidence of cracking.
Replace if split or cracked.
Replace if valve fails to pass testing in
paragraph 5.11.4.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion,
damage or leakage.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion or
damage.
Replace if there is evidence of corrosion or
damage.
Replace if corroded or damaged.
Replace if there is evidence of rupture or
leakage.
Repair or Replacement
The following guidelines are to be followed regarding repair and replacement of components:
a. Carefully repair minor thread damage. If the thread repair causes loose fitting parts or
leakage, replace the component.
b. Replace parts if damaged or worn to the extent that sealing action or usability are affected.
c. Replace any component that does not meet testing requirements specified in Section 5.11.
d. Replace tube assemblies if damaged.
e. Clean repaired or replacement parts prior to assembly.
5.10
Reassembly of the Container Assembly
a. Perform reassembly in an area suitable for maintaining cleanliness.
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Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
CAUTION
Do not apply anti-seize tape on any flared, or straight thread fittings.
Make sure the tape does not overlap the end of the tapered fittings.
b. Apply anti-seize tape to all male pipe threads prior to reassembly. When applying the tape,
exercise care to apply a single layer of tape on the fitting, overlapping the ends just enough to
avoid a gap when the fitting is installed.
c. No lubrication is required during reassembly of the Container Assembly.
d. Reassemble the Container Assembly in reverse order of disassembly.
5.11
Calibration and Testing
General information regarding calibration and testing of the NPTLOX System are as follows:
a. Alternate test methods and test apparatus can be used if they provide the necessary accuracy
and are compatible with the respective requirements.
b. Calibration and testing of the listed components should be accomplished every 12 months or
sooner as usage factors and operational conditions require. The components should be
calibrated or tested anytime it is suspected or known that they are operating or indicating
inaccurately.
c. Calibration or testing should be accomplished in a clean, controlled environment and the
results recorded and maintained. The equipment should not be allowed to become
contaminated or come into contact with oil, grease, dirt, or other hydrocarbons or
contaminants.
d. All components should be maintained in a clean condition and properly packaged for storage
or shipment prior to installation into the system. The components should not be installed into
a system until it has been determined that they are clean and free of hydrocarbons.
Calibration or testing procedures are described for the following components:
a.
b.
c.
d.
e.
f.
Container assembly
Flow control valves
Pressure gauge
Pressure regulator
Quantity indicator
Pressure relief valve
5.11.1 Leakage Testing of the Container Assembly
Tests for external leakage must be made with a solution that is suitable for use with oxygen, in
accordance with Military Specification MIL-PRF-25567.
a. Ensure the Container Assembly has been emptied of LOX and purged.
Manual Part Number 50C-0083-0161 Rev G
39
Essex Industries, Inc.
Note:
Obtain access to the inside of the Container Assembly prior to
proceeding to the next steps (see paragraph 5.6).
b. Pressurize the Container Assembly through the slow fill port with gaseous nitrogen
conforming to Type I, Grade A or B, Class 1 of A-A-59503 to 90  5 PSIG as illustrated in
Figure 5.1.
PRESSURE
GAUGE PG-1
PRESSURE
SOURCE
PRESSURE
REGULATOR
MS22068-7 SLOW FILL
PORT CONNECTION
Figure 5.1. Leakage Test Setup.
CAUTION
Do not apply leak test solution to ports or vent openings of the pressure
regulator and valves. Failure to do so will result in improper operation of
the system.
c. Apply an approved leak test solution to all fittings, and/or threaded joints on the Container
Assembly. There should be no leaks at any joint except for allowable leakage through the
valves.
d. For any leaks at threaded connections tighten the fittings and recheck for leaks.
e. If any leaks remain, return the system to the appropriate repair facility or OEM for
maintenance.
f. Clean up all leak detecting solution that was used for the procedure above using a damp lint
free towel.
5.11.2 Filling and Buildup Testing
a. Record the empty weight of the Container Assembly prior to filling.
b. Remove the dust cap from the filler port.
40
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
c. Connect the female filler valve from the LOX servicing tank to the filler port and start timing
the filling operation at the instant the connection is made.
d. Monitor the vent port. The instant there is a steady stream of liquid oxygen being emitted
from the vent port, disconnect the filler valve and note the time. This will be the fill time,
which should not exceed 15 minutes.
e. Connect a vent cap (see Figure 1.2) to the filler port and allow the Container Assembly to
remain undisturbed for a two-hour stabilization period.
f. After the two-hour stabilization period, connect the Pressure Gauge Test Fixture, Essex Part
No. 50C-0083-0165 (see Figure 1.3), or a suitable equivalent, to the slow fill port.
g. Remove the vent cap and observe the pressure gauge. Monitor the time it takes for the
pressure to reach 80 PSIG as indicated on the test gauge. This will be the buildup time and
should not exceed 6 minutes.
5.11.3 Evaporation Loss Testing
a. Refill if necessary the Container Assembly to capacity with liquid oxygen.
b. Remove the filler port dust cap and attach a vent cap (see Figure 1.2) to allow the unit to
vent.
c. Allow the unit to stand for 2 hours for equilibrium to be established. Do not allow the unit to
be agitated during this test.
d. After the 2-hour period, weigh the Container Assembly and record the weight.
e. Allow the unit to stand for a 24-hour period.
f. After the 24-hour period, weigh the unit again and compare the two weights. The loss in
weight shall be less than 2.8 pounds. If the Container Assembly does not meet this criteria,
remove and replace the Dewar and Manifold Assembly or return the unit to the OEM for
repair.
5.11.4 Testing of the Fill, Buildup and Vent Valve
Testing of the fill, buildup and vent valve can be accomplished only with the valve removed
from the Container Assembly. Conduct the following procedures to ascertain that the valve is
functioning correctly.
a. A regulated gaseous source of oxygen conforming to SAE AS8010, nitrogen conforming to
Type I, Grade A or B, Class 1 of A-A-59503, or air conforming to BB-A-1034 is required to
conduct the following tests.
b. Fill check element leakage. Using the appropriate appliances, connect test fixtures to the
valve as illustrated in Figure 5.2. Adjust the pressure regulator to apply a pressure of 70
PSIG to the fill outlet port. The flow through the CRU-59/E female filler valve shall not
Manual Part Number 50C-0083-0161 Rev G
41
Essex Industries, Inc.
exceed 0.25 LPM as indicated on the flowmeter. Valves not meeting the requirement should
be replaced.
VENT
__
__
__
__
__
__
__
__
__
__
__
__
__
VENT
CRU-59/E
FILLER
VALVE
FILL
INLET
CRU-50/A FILL,
BUILDUP &
VENT VALVE
BUILDUP
PRESSURE
GAUGE
FLOWMETER
FILL
OUT
GAS
PRESSURE
SOURCE
PRESSURE
REGULATOR
Figure 5.2. Fill Check Element Leakage Setup.
c. Fill inlet and vent port backpressure leakage. Using the appropriate appliances, connect
test fixtures to the valve as illustrated in Figure 5.3. The gas port shall be plugged with a
fitting suitable for a 3/8-inch NPT female connection. Pressures of 10 inches of water, 70
PSIG, and 300 PSIG shall be applied for a minimum of 2 minutes at each pressure to the fill
outlet and the buildup ports. During pressurization at each level, the total of the fill port
leakage and the vent port leakage shall not exceed 0.06 LPM. Valves not meeting this
requirement should be replaced.
VENT
__
__
__
__
__
__
__
__
__
__
__
__
__
PRESSURE
GAUGE
VENT
CRU-59/E
FILLER
VALVE
FILL
INLET
PRESSURE
SOURCE
CRU-50/A FILL,
BUILDUP &
VENT VALVE
BUILDUP
PRESSURE
REGULATOR
FLOWMETER
FILL
OUT
GAS
PLUGGED
Figure 5.3. Fill Inlet and Vent Port Backpressure Leakage Setup.
d. Gas port leakage. Using the appropriate appliances, connect test fixtures to the valve as
illustrated in Figure 5.4. The fill outlet and vent port shall be plugged with a fitting suitable
for a 3/8-inch NPT female connection. A pressure of 30 PSIG shall be applied through the
CRU-59/E female filler valve into the fill inlet connection and to the buildup port for a
minimum of 2 minutes. Leakage from the gas port shall not exceed 0.25 LPM. Valves not
meeting this requirement should be replaced.
42
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
PLUGGED
PRESSURE
GAUGE
VENT
PRESSURE
SOURCE
CRU-59/E
FILLER
VALVE
VENT
CRU-50/A FILL,
BUILDUP &
VENT VALVE
FILL
INLET
PRESSURE
REGULATOR
FILL
OUT
__
__
__
__
__
__
__
__
__
__
__
__
__
BUILDUP
GAS
PLUGGED
FLOWMETER
Figure 5.4. Gas Port Leakage Setup.
e. Install protective plugs such as part number M5501/7-F12 or NAS834-55 (NSN 5340-01043-7077), or a suitable equivalent for 3/8-inch NPT female pipe threads, in all of the
threaded ports, except for the buildup port, to protect the valve from contamination after
testing. The buildup port requires a plug such as part number M5501/7-F5 or NAS834-33
(NSN 5340-01-104-0373), or a suitable equivalent for 1/8-inch NPT female pipe threads.
5.11.5 Testing of the Pressure Closing Valve
Testing of the pressure-closing valve can be accomplished only with the valve removed from the
Container Assembly. Conduct this procedure to ascertain that the valve is functioning correctly.
a. A regulated gaseous source of oxygen conforming to SAE AS8010, nitrogen conforming to
Type I, Grade A or B, Class 1 of A-A-59503, or air conforming to BB-A-1034 is required to
conduct the following tests.
b. Using the appropriate appliances connect test fixtures to the pressure closing valve as
illustrated in Figure 5.5.
PRESSURE
GAUGE PG-2
PLUGGED
VENT
C
A
PRESSURE
CLOSING VALVE
PRESSURE
GAUGE PG-1
VALVE
V-2
PRESSURE
SOURCE
B
PRESSURE
REGULATOR
VALVE
V-1
Figure 5.5. Pressure Closing Valve Testing.
Manual Part Number 50C-0083-0161 Rev G
43
Essex Industries, Inc.
c. With the fixtures attached and valve V-2 closed, open valve V-1 and apply 100 PSIG to the
inlet port B by adjusting the pressure regulator and observing pressure gauge PG-1.
Indicated pressure on pressure gauge PG-2 should be between 80 and 90 PSIG. Valves not
meeting the requirement should be replaced.
d. Once the outlet pressure on pressure gauge PG-2 has been affirmed between 80 to 90 PSIG
with 100 PSIG applied to the inlet, allow the valve to remain pressurized for 3 minutes and
ascertain the pressure on pressure gauge PG-2 does not increase over 5 psi during this period.
e. Momentarily decrease the outlet pressure on pressure gauge PG-2 by opening valve V-2, then
close valve V-2 and allow the pressure to stabilize. Repeat step d. three times, after
decreasing the outlet pressure as instructed in this step. Valves not meeting the leakage
criteria of step d. should be replaced.
f. With valve V-2 closed, increase the source pressure to indicate 120 PSIG on pressure gauge
PG-1 and allow the pressure to stabilize for one minute.
Note:
There is a vent hole drilled inside one of the spanner wrench insets on
the topside of the bellows housing retainer (see Figure 5.6). The inset
with the vent hole must be plugged prior to accomplishing the next step
to prevent leak test solution from entering the bellows housing.
Vent hole
Figure 5.6. View of Vent Hole.
g. Install a protective plug such as part number M5501/7-F1 or NAS834-11 (NSN 5340-01113-0878) or a suitable equivalent in the vented spanner wrench inset described in the
foregoing note.
h. Apply an approved leak test solution around the adjustment screw end of the valve and
ascertain there is no external leakage. Valves showing indication of external leakage should
be replaced.
i. Remove all traces of the leak test solution using a damp lint free towel, remove the protective
cap plug installed in step g., and depressurize the test set-up prior to removing the test
equipment.
44
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
j. Install protective plugs such as part number M5501/7-F5 or NAS834-33 (NSN 5340-01-1040373), or a suitable equivalent for 1/8-inch NPT female pipe threads, in the inlet and outlet
ports to protect the valve from contamination after testing.
5.11.6 Testing of the Pressure Relief Valves
Testing of the oxygen pressure relief valves can be accomplished only with the valves removed
from the Container Assembly. The procedure for testing is the same for both valves except for the
operating range (see Table 5-4).
Table 5-4. Relief Valve Characteristics.
Description
System Relief Valve
Safety Relief Valve
Figure No.
8.3
8.3
Item No.
5
6
Part No.
20C-0050-2
20C-0050-14
Operating Range
100-120 PSIG
170-200 PSIG
a. Connect a regulated source of gaseous oxygen conforming to SAE AS8010, nitrogen
conforming to Type I, Grade A or B, Class 1 of A-A-59503, or air conforming to BB-A-1034
to valve inlet A as illustrated in Figure 5.7.
PRESSURE
GAUGE PG-1
VENT
PRESSURE
SOURCE
A
RELIEF VALVE
PRESSURE
REGULATOR
R-1
B
__
__
__
__
__
__
__
__
__
__
__
__
__
FLOWMETER
Figure 5.7. Pressure Relief Valve Testing.
b. Connect a 0-150 LPM flowmeter to valve port B and adjust regulator R-1 to attain an inlet
pressure 5 PSIG below the minimum pressure specified in Table 5-4 as indicated on pressure
gauge PG-1. No flow should be indicated on the flowmeter. Valves not meeting the
requirement should be replaced.
c. Slowly increase the inlet pressure on valve port A while observing the flowmeter as the
pressure is increased as indicated on pressure gauge PG-1. Note the inlet pressure at the
instant the flowmeter begins to indicate flow. This pressure should be between the minimum
and maximum values for the operating range of the valve. Valves not meeting the
requirement should be replaced.
d. Increase the inlet pressure by slowly adjusting regulator R-1 to indicate the maximum
operating pressure on pressure gauge PG-1 and ascertain a minimum outlet flow of 100 LPM
as indicated on the flowmeter. Valves not meeting the requirement should be replaced.
Manual Part Number 50C-0083-0161 Rev G
45
Essex Industries, Inc.
e. Lower the inlet pressure by slowly adjusting regulator R-1 and observing pressure gauge PG1. Flow should reduce to 0 on the flowmeter prior to the pressure decreasing below the
minimum operating pressure on pressure gauge PG-1. Valves not meeting the requirement
should be replaced.
f. Disconnect the 0-150 LPM flowmeter and prepare a 0-50 cc flowmeter with a “disc type”
inlet connection on the flex line of the flowmeter.
g. Increase inlet pressure slowly until the pressure on pressure gauge PG-1 reaches the
maximum operating pressure momentarily then reduce the inlet pressure to 10 PSIG below
the minimum operating pressure and allow the pressure to stabilize for 1 minute.
h. With the pressure maintained on the inlet, hold the elastomer disc type flowmeter pickup
tightly over valve outlet port B. Indicated leakage shall not exceed 0.01 LPM on the
flowmeter. Valves not meeting the requirement should be replaced.
i. Install a protective cap over the inlet port and a protective plug in the outlet port such as part
number M5501/7-F8 or NAS834-41 (NSN 5340-01-063-1192) and part number M5501/7-F5
or NAS834-33 (NSN 5340-01-104-0373) respectively, or suitable equivalents for 1/8-inch
NPT male and female pipe threads, to protect the valve from contamination after testing.
5.11.7 Testing of the Flow Control Valve
To verify the flow control valve delivery rates, perform the following procedures:
Note:
The flow control valve delivery rates cannot be adjusted but the rates
may be verified for accuracy.
a. Fill the Container Assembly with a quantity of liquid oxygen and allow to temperature
stabilize or use step i.
CAUTION
The following sequence must be followed to prevent pressurized oxygen
from escaping from the Container Assembly through an open-ended
hose.
b. Assemble a male quick disconnect fitting to a calibrated master pressure gauge registering
from 0 to 100 PSIG. Insert the gauge assembly into one of the outlet ports and cross check
the reading on each gauge.
c. Attach a flow control valve to an oxygen hose.
d. Using a short piece of tubing, connect a flowmeter capable of reading from 0 to 20 LPM to
the flow control valve outlet.
e. Set the flow control valve to the zero (0) flow setting.
f. Insert the oxygen hose male quick disconnect into a Container Assembly outlet port.
46
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
g. Observe that the master pressure gauge remains within the 50  5 PSIG limits during gas
flow.
h. Set the flow control at each of the flow settings and establish that the flowmeter reading is
comparable to the flow tolerances specified in Table 5-5. Replace any flow control valve
that does not meet the requirements of Table 5-5.
Table 5-5. Flow Rate Tolerance.
Flow Setting
0
.5
1
2
3
4
5
6
8
10
12
15
Flow Tolerance, LPM
No leakage
0.40 – 0.60
0.90 – 1.10
1.80 – 2.20
2.70 – 3.30
3.60 – 4.40
4.50 – 5.50
5.40 – 6.60
7.20 – 8.80
9.00 – 11.00
10.80 – 13.20
13.50 – 16.50
Note: Tolerance based on metered gaseous oxygen flow with operating
pressure of 50  5 PSIG.
i. An alternate test method may be employed by substituting for the Container Assembly a
cylinder of oxygen conforming to SAE AS8010 with a pressure regulator and gauge in line to
the flow control valve and flowmeter as illustrated in Figure 5.8.
F2
UUT
V1
OUTLET
CONNECTION
F1
G1
INLET
CONNECTION
SOURCE
PRESSURE
R1
Figure 5.8. Alternate Flow Control Valve Setup.
5.11.8 Testing of the Outlet Pressure Gauge
To check the calibration of the outlet pressure gauge perform the following procedural steps:
Manual Part Number 50C-0083-0161 Rev G
47
Essex Industries, Inc.
Note:
The pressure gauge cannot be recalibrated but may be verified for
accuracy only.
a. Fill the Container Assembly with a quantity of liquid oxygen and allow to temperature
stabilize.
CAUTION
The following sequence must be followed to prevent pressurized oxygen
from escaping from the Container Assembly through an open-ended
hose.
b. Assemble a male quick disconnect fitting to a calibrated master pressure gauge registering
from 0 to 100 PSIG. Insert the gauge assembly into one of the outlet ports and cross check
the reading on each gauge.
c. Attach the flow control valves to the three oxygen hoses.
d. Set all the flow control valves to the zero (0) flow setting.
e. Insert each of the oxygen hose male quick disconnects into a Container Assembly outlet
disconnect port.
f. Set all the flow control valves to the maximum flow setting of 15 LPM. The total flow will
be 45 LPM.
g. Assure that the pressure indication has stabilized on the master pressure gauge.
h. If the outlet pressure gauge differs beyond  1 PSIG from the master pressure gauge, remove
and replace, then test the new gauge for accuracy.
5.11.9 Testing of the Pressure Regulator
To check the calibration of the pressure regulator perform the following procedural steps:
Note:
The pressure regulator is preset and cannot be adjusted but may be
verified for accuracy only.
a. Fill the Container Assembly with a quantity of liquid oxygen and allow to temperature
stabilize.
CAUTION
The following sequence must be followed to prevent pressurized oxygen
from escaping from the Container Assembly through an open-ended
hose.
48
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
b. Assemble a male quick disconnect fitting to a calibrated master pressure gauge registering
from 0 to 100 PSIG. Insert the gauge assembly into one of the outlet ports and cross check
the reading on each gauge.
Note:
A total of five sets of flow control valves and oxygen hoses are required
for the next step.
c. Attach five (5) flow control valves to five (5) oxygen hoses.
d. Set all the flow control valves to the zero (0) flow setting.
e. Insert each of the oxygen hose male quick disconnects into a Container Assembly outlet
disconnect port.
f. Set four of the flow control valves to the maximum flow setting of 15 LPM and the
remaining flow control valve to the setting of 6 LPM. The total flow set will be 66 LPM.
g. Assure that the pressure indication has stabilized on the master pressure gauge. The pressure
indication shall not be less than 45 PSIG.
h. Set all the flow control valves to the zero (0) flow setting.
i. Assure that the pressure indication has stabilized on the master pressure gauge. The pressure
indication shall not be greater than 62 PSIG.
j. If the pressure regulator does not meet the limits from the previous steps, remove and
replace, then test the new regulator for accuracy.
5.11.10 Calibration Check of the Quantity Indicator
The calibration of the quantity indicator can be determined in the following manner:
a. Ensure that all LOX has been drained from the Container Assembly and the unit purged. To
verify that the quantity indicator is within proper calibration when the system is empty, press
the “LOX QTY” button (see Figure 2.1). The reading should be 0.0  0.5. If the indicator is
not within the limits specified, return the system to the OEM for repair.
b. Place the Container Assembly on a scale with a capacity of at least one hundred fifty pounds
with a minimum accuracy of 1 percent full scale. Record the true weight of the empty
Container Assembly, label as We.
c. Fill the Container Assembly while on the scale to capacity with liquid oxygen and allow the
filled Container Assembly to stabilize for a minimum of 5 minutes and allow time for any
remaining LOX in the drip pan to boil off.
d. Record the weight of the Container Assembly while filled with LOX, label as W.
Manual Part Number 50C-0083-0161 Rev G
49
Essex Industries, Inc.
e. Press the “LOX QTY” button on the indicator and note the reading. The value displayed by
the quantity indicator shall be within ± 0.5 liters of the quantity calculated by the following
formula:
Lcalculated 
W  We
2.512
f. If the quantity indicator inaccurately registers the contents, recheck the battery power supply
as described in paragraph 2.4. If the battery level checks out return the system to the OEM
for repair.
50
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
6.0
PREPARATION FOR SHIPMENT
To prepare the NPTLOX System for shipment in a reusable shipping container the system must
be drained of all LOX and the internal pressure must be below 40 PSIG. To accomplish this task,
proceed in the following manner:
a. Ensure that all LOX has been drained from the Container Assembly either through usage or
in accordance with the procedures presented in paragraph 4.6. Purging of the Container
Assembly in accordance with the procedures presented in paragraph 4.7.2 may be necessary
to assure that all LOX has been removed.
b. Ensure that the Container Assembly has a positive pressure from 30 to 40 PSIG indicated on
the outlet pressure gauge. If necessary, pressurize the Container Assembly through the slow
fill port with gaseous nitrogen conforming to Type I, Grade A or B, Class 1 of A-A-59503 to
40 +0/-5 PSIG.
c. Latch the Accessory Kit to the top of the Container Assembly.
CAUTION
Do not allow petroleum contaminants of any kind to be used or stored
on or about these containers.
d. Place the NPTLOX System into an available reusable shipping container.
e. When transported, the shipping container is compatible with a 463L cargo pallet, and can be
stacked 2 units high on the pallet.
Manual Part Number 50C-0083-0161 Rev G
51
Essex Industries, Inc.
7.0
STORAGE
To prepare the NPTLOX System for storage in a reusable shipping container the system must be
drained of all LOX and the internal pressure must be below 40 PSIG. To accomplish this task proceed
in the following manner:
a. Ensure that all LOX has been drained from the Container Assembly either through usage or
in accordance with the procedures presented in paragraph 4.6. Purging of the Container
Assembly in accordance with the procedures presented in paragraph 4.7.2 may be necessary
to assure that all LOX has been removed.
b. Ensure that the Container Assembly has a positive pressure from 30 to 40 PSIG indicated on
the outlet pressure gauge. If necessary, pressurize the Container Assembly through the slow
fill port with gaseous nitrogen conforming to Type I, Grade A or B, Class 1 of A-A-59503 to
40 +0/-5 PSIG.
c. Remove the two (2) batteries from the quantity indicator and reinstall the battery
compartment access panel. See paragraph 5.4.2 for battery removal.
d. To preclude freezing, ensure the three (3) humidification bottles in the Accessory Kit are
empty.
e. Latch the Accessory Kit to the top of the Container Assembly.
CAUTION
Do not allow petroleum contaminants of any kind to be used or stored
on or about these containers.
f. Place the NPTLOX System into an available reusable shipping container.
52
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
8.0
PARTS LIST
8.1
Parts List Illustrations
The following arrangement type drawings illustrate the breakdown and exploded views of the
NPTLOX System and subsystems. Following each figure is a parts list table that provides a reference to
each figure that includes the following: index number, quantity per assembly, the part number and
description, and the manufacturer of the part. O-level maintenance is limited to inspection, battery
replacement, and tightening fittings to stop leaks. Contact Essex Industries, Inc. for any replacement
parts.
Manual Part Number 50C-0083-0161 Rev G
53
Essex Industries, Inc.
Figure 8.1. Converter Assembly (Exploded View).
Index
No.
8.11
2
3
4
5
6
7
54
Quantity Per
Assembly
1
1
1
1
1
1
2
Part Number
50C-0083-1
50C-0021-0001-1
50C-0083-0100
50C-0083-0101
50C-0083-0132
50C-0083-0161
50C-0083-0162
8C-0509-0003
Description
Converter Assembly
Kit Assembly, Accessory
Container Assembly, LOX
Container, Shipping
Plate, Identification
Manual, Operation
Pouch, Storage
Battery, 9 Volt, Lithium
Manual Part Number 50C-0083-0161 Rev G
Manufacturer
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries, Inc.
Figure 8.2. Accessory Kit Assembly (Exploded View).
Index
No.
8.21
2
3
4
5
6
7
8
Quantity Per
Assembly
3
3
3
3
1
1
3
Part Number
50C-0021-0001-1
50C-0021-0006
50C-0021-0012
50C-0021-0013
50C-0021-0014
50C-0021-0073
Not used
50C-0083-0094-1
8C-0505-0001
Description
Manufacturer
Kit Assembly, Accessory
Valve/Clamp Assembly
Bottle, Humidifier
Hose Assembly, Oxygen
Rack Assembly, Hose
Case Assembly
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Plate, Identification
Adapter, Schrader
Essex Industries
Essex Industries
Manual Part Number 50C-0083-0161 Rev G
55
Essex Industries, Inc.
Figure 8.3. Converter Assembly – NPTLOX (Exploded View).
56
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
(Sheet 1/3)
Figure 8.3. Converter Assembly – NPTLOX (Exploded View).
Manual Part Number 50C-0083-0161 Rev G
57
Essex Industries, Inc.
(Sheet 2/3)
58
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
Figure 8.3. Converter Assembly – NPTLOX (Exploded View).
(Sheet 3/3)
Manual Part Number 50C-0083-0161 Rev G
59
Essex Industries, Inc.
Index
No.
8.31
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
60
Quantity Per
Assembly
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
4
4
1
1
1
1
1
2
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
2
1
1
1
1
1
Part Number
50C-0083-0100
8C-0492-0001
8C-0493-0001
20C-0008-2
20C-0009-1
20C-0050-2
20C-0050-14
50C-0021-0032
50C-0083-0014
50C-0083-0025
50C-0083-0026
50C-0083-0028
50C-0083-0038
50C-0083-0039
50C-0083-0040
50C-0083-0041
50C-0083-0042
50C-0083-0043
50C-0083-0044
50C-0083-0058
50C-0083-0060
50C-0083-0062
8C-0974-0001
50C-0083-0066
50C-0083-0068
50C-0083-0070
50C-0083-0086
50C-0083-0087
50C-0083-0094
50C-0083-0099
50C-0083-0104
50C-0083-0116
50C-0083-0117
50C-0083-0118
50C-0083-0119
50C-0083-0121
50C-0083-0122
50C-0083-0123
50C-0083-0124
50C-0083-0125
50C-0083-0126
50C-0083-0128
50C-0083-0129
50C-0083-0130
50C-0083-0134
50C-0083-0136
50C-0083-0137
50C-0083-0138
50C-0083-0141
50C-0083-0145
50C-0083-0150
50C-0083-0153
50C-0083-0154
50C-0083-0155
Description
Container Assembly, LOX
Connector, Elbow
Connector, Elbow
Valve, Pressure Closing
Check Valve
Valve, Relief
Valve, Relief
Guide
Indicator, LOX Quantity
Coupling Assembly
Hose Assembly, Vent
Hose Assembly, Slow Fill
Panel Assembly, Rear
Panel Assembly, Front
Panel Assembly, Wrap Around
Panel Assembly, Bottom
Pan, LOX Drip
Foot
Spacer, Drip Pan
Housing Assembly, Fill Port
Housing Assembly, Outlet
Door Assembly, Access
Gauge, Pressure
Manifold Assembly, Outlet
Support Assembly, Heater Ex.
Heat Exchanger
Screw, Shoulder
Fitting, Fill, 4-Way
Regulator, Pressure, Oxygen
Dewar & Manifold Assembly
Mount Assembly, Gauge
Tube Assembly
Tube Assembly
Tube Assembly
Tube Assembly
Tube Assembly
Tube Assembly
Tube Assembly
Tube Assembly
Fitting, Tee
Fitting, Tee, Bulkhead
Fitting, Adapter
Fitting, Tee
Bracket Assembly, Regulator
Bracket Assembly, Valve
Cable Assembly, High, “B”
Cable Assembly, Low, “E”
Cap Assembly, Dust
Spacer
Bracket Assembly, Flat
Vaporizer, Finned
Boiler Assembly
Tube
Tube Assembly
Manual Part Number 50C-0083-0161 Rev G
Manufacturer
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries, Inc.
Index
No.
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
Quantity Per
Assembly
4
4
1
1
1
15
1
8
12
1
1
1
1
2
1
1
3
1
3
1
3
1
2
6
25
4
74
18
1
4
4
6
2
1
4
1
4
7
4
5
1
2
2
4
4
1
1
1
2
1
Part Number
50C-0083-0156
50C-0083-0156-1
50C-0083-0157
50C-0083-0159
0580560100-1
AN960C8
AN960C10
AN960C10L
AN960C416L
AS4861D01
AS4863D01
AS5174D0505
AS5174D0605
AS5178D05
AS5178D06
AS5180D06
AS5194D0502
AS5194D0504
AS5195D0502
AS5195D0504
AS21919WDG5
AS21919WDG9
AS21919WDG14
M7891LF-3
MS21044D08
MS21044D3
MS24693-C49
MS24693-C50
MS24693-C52
MS24693-C64
MS35307-303
MS35307-305
MS35307-312
MS35333-78
MS35338-139
MS51957-15
MS51957-44
MS51957-46
MS51957-50
MS51957-51
MS51957-52
MS51957-64
MS51957-70
MS51958-65
NAS43DD3-32FC
NAS43DD3-56FC
NAS43DD3-71FC
NAS61-08C-037
NAS1715D5NH
10C-0016-0061
Description
Spacer
Spacer
Tube Assembly
Tube, Heat Shrink
Valve, Build-up
Washer, Flat
Washer, Flat
Washer, Flat
Washer, Flat
Bushing, Pipe
Plug, Pipe
Fitting, Union
Fitting, Reducer
Nut, Fitting, Bulkhead
Nut, Fitting, Bulkhead
Fitting, Adapter, Bulkhead
Fitting, Adapter
Fitting, Adapter
Fitting, Elbow
Fitting, Elbow
Clamp, Cushioned
Clamp, Cushioned
Clamp, Cushioned
Filler Valve, Female
Nut, Self-locking
Nut, Self-locking
Screw, Machine, Countersink
Screw, Machine, Countersink
Screw, Machine, Countersink
Screw, Machine, Countersink
Screw, Hex Head
Screw, Hex Head
Screw, Hex Head
Washer, Lock
Washer, Lock – Spring
Screw, Pan Head
Screw, Pan Head
Screw, Pan Head
Screw, Pan Head
Screw, Pan Head
Screw, Pan Head
Screw, Pan Head
Screw, Pan Head
Screw, Pan Head
Spacer, Sleeve
Spacer, Sleeve
Spacer, Sleeve
Spacer, Sleeve
Clamp, Cushioned
Burst Disc
Manual Part Number 50C-0083-0161 Rev G
Manufacturer
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
Essex Industries
61
Essex Industries, Inc.
9.0
OPERATIONAL DIAGRAMS
9.1
Fill Mode
Figure 9.1. Fill Mode.
62
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
9.2
Buildup Mode
Figure 9.2. Buildup Mode.
Manual Part Number 50C-0083-0161 Rev G
63
Essex Industries, Inc.
9.3
Operation Mode
Figure 9.3. Operation Mode.
64
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
10.0
ACRONYMS AND ABBREVIATIONS
ACLS
AE
AECT
AELT
AFSC
AMC/SG
BDU
BMET
CM
D-Level
LOX
LPM
MASF
NPTLOX
NSN
O-Level
OEM
PM
POL
PSIA
PSIG
PTLOX
QTY
T.O.
USAF
USAFSAM
Advanced Cardiac Life Support
Aeromedical Evacuation
Aeromedical Evacuation Control Team
Aeromedical Evacuation Liaison Team
Air Force Specialty Code
Air Mobility Command/Surgeon General
Battle Dress Uniform
Biomedical Equipment Technician
Corrective Maintenance
Depot-Level
Liquid Oxygen
Liters Per Minute
Mobile Aeromedical Staging Facility
Next-Generation Portable Therapeutic Liquid Oxygen
National Stock Number
Organizational-Level
Original Equipment Manufacturer
Preventive Maintenance
Petroleum, Oils, and Lubricants
Pounds Per Square Inch Absolute
Pounds Per Square Inch Gauge
Portable Therapeutic Liquid Oxygen
Quantity
Technical Order
United States Air Force
United States Air Force School of Aerospace Medicine
Manual Part Number 50C-0083-0161 Rev G
65
Essex Industries, Inc.
Page Intentionally Left Blank
66
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
APPENDIX A
Operation and Maintenance Manual Deficiency/Evaluation Report
Manual Part Number 50C-0083-0161 Rev G
67
Essex Industries, Inc.
Page Intentionally Left Blank
68
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
Operation and Maintenance Manual Deficiency/Evaluation Report
1. DOCUMENT TITLE
Next-Generation Portable Therapeutic Liquid Oxygen (NPTLOX) System
Operation and Maintenance Manual
2. NAME OF SUBMITTING ORGANIZATION
3. ADDRESS (Street, City, State, Zip Code)
4. PROBLEM AREAS
a. Paragraph Number and Wording:
b. Recommended Wording:
c. Reason/Rationale for Recommendations:
5. REMARKS
6a. NAME OF SUBMITTER (Last, First, MI)
6b. WORK TELEPHONE NUMBER (Include Area
Code)
6c. DATE OF SUBMISSION (YYMMDD)
7.
MAIL TO:
Essex Industries, Inc.
8007 Chivvis Drive
St. Louis, MO 63123
Manual Part Number 50C-0083-0161 Rev G
69
Essex Industries, Inc.
Page Intentionally Left Blank
70
Manual Part Number 50C-0083-0161 Rev G
Essex Industries, Inc.
Limited Warranty
Essex Industries (hereinafter referred to as Seller) warrants the Next-Generation Portable Therapeutic Liquid
Oxygen (NPTLOX) System will be free from defects in workmanship and materials for a period of twelve (12) months
from the date of acceptance by the buyer.
Buyer’s exclusive remedy for breach of this warranty shall be the repair or replacement at Seller’s option and
expense, of any product or component part thereof that is proven to be other than as herein warranted.
Surface transportation charges covering any defective product or component, shall be at Seller’s expense; however,
transportation charges covering any product or component part returned and redelivered which proves not to be
defective shall be at Buyer’s expense.
This warranty does not extend to any Seller product or component part thereof which has been subjected to misuse,
accident, or improper installation, maintenance, or application; or to any product part thereof which has been
repaired or altered outside of Seller’s facilities unless authorized in writing by Seller, or unless such installation,
repair or alteration is performed by Seller, or repair facility authorized by Seller. Any repaired or replacement
product or component part thereof provided by Seller under this warranty shall, upon delivery to the Buyer, be
warranted for a period of 12 months from return of item.
THIS WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, ARISING BY OPERATION OF LAW OR OTHERWISE AND
WHETHER RELATED TO MERCHANTABILITY, FITNESS FOR PARTICULAR OR
INTENDED PURPOSE OR OTHERWISE AND IN NO EVENT SHALL SELLER BE LIABLE
FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Limits of Liability:
Seller shall not under any circumstances be liable for any damages greater than the cost of the articles sold hereunder,
including general, special, incidental, or consequential damages, whether arising from Seller’s breach of contract, breach of
expressed or implied warranty, or law giving rise to strict liability, or any other cause.
Manual Part Number 50C-0083-0161 Rev G
71
Essex Industries, Inc.
8007 Chivvis Drive
St. Louis, MO 63123
314-832-8077
Manual Part Number 50C-0083-0161 Rev G