11/30/15
DESIGN NO. _____
SECTION 15416
GAS PIPING SYSTEM
PART 1 - GENERAL
1.01 DESCRIPTION OF WORK
A.
Extent of gas piping system work is indicated on Drawings
and by the requirements of this Section.
1.02 SUBMITTALS
A.
B.
Product Data:
1.
Manufacturer’s product data
2.
Installation Instructions
3.
Capacities
4.
Gas booster manufacturer’s design data sheet
Submit Shop Drawings indicating all operating pressures
and catalog cuts for the following:
1.
Gas piping materials
2.
Gas piping layout including service, meter and
distribution
piping,
with
gas
booster,
if
applicable.
3.
Gas Safety Shut-Off Valves
4.
Master Gas Control Valves
5.
Gas Lubricated Plug Valves and Gas Cocks
6.
Gas Pressure Booster System Including:
a.
b.
c.
d.
e.
f.
g.
h.
i.
7.
NYCSCA
Gas booster pump
Gas pressure switch
Lubricated plug valves
Check valves
Flexible pipe coupling
Pressure gauges
Heat exchanger
Control system - panel and wiring diagram.
Pressure and gas flow compensation module
Strainers
GAS PIPING SYSTEM 15416 - 1
11/30/15
DESIGN NO. _____
8.
Pipe joint sealing materials
9.
Flanges and Gaskets
10.
Pulsating Gas Meter
11.
Relay & Control Panel
12.
Gas Pressure Regulators
C.
Wiring Diagrams
D.
Certifications
1.
Submit copies of Certified Welder Qualifications.
Submittal shall be made no less than seven (7)
working days prior to commencement of work.
2.
Certificate of satisfactory installation from the
manufacturer of gas boosting system.
E.
Submit a detailed schedule for the installation of gas
piping and the welding thereof.
F.
Warranty:
1.
10
G.
Gas Booster Pump
“New Steel Gas Pipe Corrosion Record” affidavit issued by
Con Edison to document acceptance of the installed
cathodic protection system.
1.03 QUALITY ASSURANCE
A.
Comply with the rules and regulations of the Gas Utility
Company, New York City Building Department (DOB) and with
the latest regulations of the Administrative Code of the
City of New York.
B.
When welding is to be performed as part of the work
covered in this specification, the Contractor, before
assigning any welder for this work, shall provide the
Authority with the names of welders to be employed for
this work. Welders installing gas piping at any pressure
shall be qualified for all pipe sizes, wall thicknesses,
and all positions in accordance with ASME Section IX
Boiler and Pressure Vessel Code and be re-qualified on an
annual basis and when requested by the commissioner.
NYCSCA
GAS PIPING SYSTEM 15416 - 2
11/30/15
DESIGN NO. _____
1.
The qualification testing shall be performed by an
agency listed with the Department of Buildings, and
the inspector witnessing the test shall be an
authorized
AWS
Certified
Welding
Inspector.
Radiographic test specimens shall be evaluated by a
radiographic inspector having a minimum radiography
qualification of Level II in accordance with the
American Society of Non-Destructive Testing (ASNT)
Recommended Practice Document No. SNT-TC-IA,
Supplement A.
2.
Copies of the certified welder qualification
reports shall be maintained by the approved agency
and the licensed plumber employing the welder(s)
for at least six (6) years and shall be made
available to the DOB upon request.
3.
The licensed master plumber employing the welder(s)
shall a submit a statement to the DOB including who
welded the gas piping along with a copy(s) of the
certified welder qualification report(s)witnessed
by a representative of the licensed master plumber,
at the time of the first roughing inspection.
4.
The licensed master plumber employing the welder(s)
shall assign to each welder an identification
symbol or number to identify the welds performed by
that particular welder. The welder shall identify
all welds with his or her symbol or number. The
licensed master plumber shall maintain records
identifying the weld(s) made by each welder for at
least six (6) years and shall make such records
available to the DOB upon request.
C.
Upon completion of Gas Pressure Booster System
installation and start-up, the booster manufacturer shall
furnish a written certification to the Authority and the
utility company that the Gas Booster System operates in
accordance with the design standards.
D.
All welding of gas piping shall be in full compliance
with ASME Section IX Boiler and Pressure Vessel Code.
Whenever welding operations are performed, the services
of a full time certified inspector or certified
technician shall be retained by the SCA to ensure said
compliance.
Certified
inspectors
and
certified
technicians shall be qualified to perform visual
inspections and shall have a minimum radiography
qualification of Level II in accordance with the American
Society of Non-Destructive Testing Recommended Practice
NYCSCA
GAS PIPING SYSTEM 15416 - 3
11/30/15
DESIGN NO. _____
Document No. SNT-TC-IA, Supplement A.
The certified
inspector or certified technician shall also be
responsible for Controlled Inspection sign off upon
completion of the work.
E.
The Project Officer shall coordinate with FID to assure
compliance during all phases of the work.
1.04 WARRANTY
A.
Provide manufacturers extended 5-year performance
warranty against failure of the gas booster pump.
PART 2 - PRODUCTS
2.01 MATERIALS
A.
General
1.
Gas Service & Gas Meter(s)
a.
b.
Gas service, meter(s) and meter piping
systems, including pipe materials, shall be in
accordance with the requirements as specified
by the gas utility company providing the
services, and in accordance with Appendix E of
the 2014 NYC Fuel Gas Code.
Gas service piping run underground outside the
building shall be mill wrapped in accordance
with the Fuel Gas code and shall have cathodic
protection in accordance with the serving
utility company requirements for service
piping.
1.
17
2.
NYCSCA
Semi-rigid Stainless Steel Multi-Legs
Hose Assembly. Refer to Article 2.14 –
Flexible Gas Pipe Passing through Seismic
Joint – for seismic resistance due to
ground movement of gas service and gas
distribution pipes.
Gas Distribution Piping
a.
Gas distribution piping shall be in accordance
with Chapter 4 – Gas Piping Installations of
the 2014 NYC Fuel Gas Code
b.
Gas distribution piping located on the roof or
exposed to the elements shall receive one coat
GAS PIPING SYSTEM 15416 - 4
11/30/15
DESIGN NO. _____
of rust inhibitor paint and one coat of yellow
finish paint.
B.
C.
12
13
14
Piping
1.
Gas piping shall be standard weight black steel
pipe. Gas control, vent and relief piping shall
also be standard weight, black steel pipe in
accordance with Section FGC 403 of the 2014 NYC
Fuel Gas Code.
Steel pipe shall be seamless or
welded made in accordance with the Current Edition
of the ASTM A53 Specification.
2.
In no case shall any gas pipe be less than 3/4".
The sizes of pipe indicate nominal pipe size.
Gas Distribution Pipe Joints (Based on Gas Pressure in
Serving Utility Piping Network)
1.
2.
3.
Gas pressure in the utility’s street piping network
is 1/2 psig (14” w.c.) or less (inclusive of system
being provided with a gas booster pump):
a.
4”(inches) pipe dia. and smaller . Threaded or
welded
b.
Over 4” (inches) pipe dia. . . . . Welded
Gas pressure in the utility’s street piping network
is greater than 1/2 psig but less that 15 psig
(inclusive of the utility company providing a
service regulator to reduce the incoming pressure
to 1/2 psig):
a.
Under 3” (inches) pipe dia. .
b.
3”(inches) and larger pipe dia. . Welded
Piping over 15 psig
a.
D.
All piping . . . . . . . . . . . . Welded
Fittings
1.
NYCSCA
. .Threaded or
Welded
Fittings for screwed gas piping shall be 150 lb,
class
150,
black
malleable
iron
fittings,
conforming to ASTM A197, latest edition.
GAS PIPING SYSTEM 15416 - 5
11/30/15
E.
F.
G.
DESIGN NO. _____
2.
Compression type fittings and steel welding
fittings shall be as specified and approved by the
Gas Company.
3.
Steel butt welding fittings shall conform to ANSI
B16.9 requirements.
Flanges
1.
All flanges shall be steel and compatible in type
and pressure ratings with mating flange and shall
comply with ANSI B16.5.
2.
Flanges shall be welding neck or threaded end.
Slip-on flanges are not permitted.
3.
Where 150 pound steel flanges are bolted to Class
125 cast iron flanges, the raised face on the steel
flange shall be removed.
Gaskets
1.
Gaskets shall be compatible with the gas service on
which they are used, without change to their
chemical or physical properties.
2.
Gasket shall be BLUE-GARD compressed asbestos free
gaskets, style 3000 or GYLON gasketing style 3500,
color: Fawn with Blue brand both as manufactured by
Garlock Inc.
3.
Gaskets of metal or metal-jackets, aluminum o-rings
and spiral wound metal gaskets, or other materials,
if approved by the Utility Company may be used.
4.
Full face gaskets shall be used with all bronze and
cast iron flanges.
Bolts and Nuts
Bolts and nuts shall be of best quality bolt steel with
square head bolts and hexagon nuts with machine cut
V-threads.
H.
Thread joint sealant materials
Thread sealant to
RectorSeal Corp
compound Hercules
approved equal.
NYCSCA
be used on natural gas piping shall be
No. 5, Oatey Great Blue pipe joint
Megaloc Multi-purpose thread sealant or
Thread sealant shall be a non-toxic,
GAS PIPING SYSTEM 15416 - 6
11/30/15
DESIGN NO. _____
soft setting, slow drying sealant made from inert
fillers. The joint sealant material may contain Teflon,
if that substance is the approved type for natural gas
application. Approved Teflon tapes may be used on natural
gas lines. Non-approved Teflon tapes for use on piping
for a natural gas system are prone to tearing when pipes
are being assembled and tightened and bits of torn tape
can migrate into the fluid system, clogging valves,
screens, and filters.
I.
Identification of Gas Pipe
Refer to Section 15431 for labeling of gas piping, which
is required to be identified whether it will be enclosed
or remain exposed as per Section FGC 401.5.
J.
Paint
1.
2.
3.
Paints and coatings used in the interior of
building to mark piping for identification purposes
shall
be
In
compliance
with
Part
205,
"Architectural Surface Coatings", Department of
Environmental Conservation, State of New York,
governing
the
emission
of
Volatile
Organic
Compounds and shall not:
a.
Exceed the VOC content limits established in
the Green Seal Standard GS-11 Pints, First
Edition, May 20, 1993.
b.
Exceed the VOC content limit of 250 g/L
established in the Green Seal Standard GC-03,
Anti-Corrosive Paints, Second Edition, January
7, 1997.
Primer Paint
a.
Interior Application: Tnemec 115 Unibond DF
or Benjamin Moore D.T.M. Acrylic Low Lustre
WP25
b.
Exterior Application: Tnemec 10-99 or
Benjamin Moore D.T.M. Alkyd Low Lustre P23
Finish Paint
a.
NYCSCA
Interior Application:
Acrylic Semi-gloss
GAS PIPING SYSTEM 15416 - 7
11/30/15
DESIGN NO. _____
b.
Exterior Application:
Aliphatic Urethane
2.02 GAS SAFETY SHUT-OFF VALVES
4
A.
Gas safety shut-off valves shall be FM & UL listed,
electric motor operated, normally closed, manual reset
type with standard handle. Valves shall be rising stem
design with a straight through flow path with metal-tometal seat and disc arrangement.
The valve seat and
rising stem shall be stainless steel and the disc ductile
iron. Valve body shall be cast iron. Valves shall be
provided with a NEMA 4 enclosure modified for Class 1,
Division II hazardous locations, Solenoid voltage: 115VAC
60 Hz. Valves shall meet ANSI Class VI leakage standard
and shall be provided with a visual indicator to note the
position of the valve whether "OPEN" or "SHUT".
B.
Gas safety shut-off valves 2" and smaller shall be
threaded, 2½" and larger shall be flanged.
Flanged
valves shall be provided with companion flange set by
valve manufacturer.
C.
Gas safety shut-off valves shall be Maxon Corporation
Series SMM12 for sizes 2" and smaller and Series CMM12
for valves 2½" and larger. All valves shall be provided
with trim package 1-1.
D.
A gas safety shut-off valve fitted in gas supply lines to
water heaters and other gas-burning equipment shall be
provided. Gas safety shut-off valve for equipment
operating on natural gas shall be interlocked with a
remote control switch/break glass switch that is intended
to stop the flow of natural gas to these equipments. This
contractor
shall
coordinate
with
the
electrical
contractor for the installation of the gas safety valve
and interlocking same with the break glass switch.
9
2.03 GAS SAFETY SHUT-OFF VALVES; OPERATING SIGN
4
A.
NYCSCA
Provide a sign made of two colors laminated engravers
stock phenolic, 1/16" minimum thickness, machine engraved
to expose inner core color (white). Signs to be provided
with uniform margins and character size minimum 1/4"
high.
GAS PIPING SYSTEM 15416 - 8
11/30/15
B.
DESIGN NO. _____
Sign to read:
"IMPORTANT"
GAS SAFETY SHUT-OFF VALVES LOCATED INSIDE GAS METER ROOM
MUST BE MANUALLY RESET UPON ACTIVATION OF THE GAS LEAK
DETECTION SYSTEM OR LOSS OF NORMAL ELECTRICAL POWER.
2.04 MASTER GAS CONTROL VALVE
A.
Master Gas Control Valve shall be a packless, explosionproof solenoid operated valve.
The valve shall have
screwed aluminum or brass body and renewable composition
discs for tight seating.
Valve shall be of normally
closed construction open when energized, equipped with
explosion-proof solenoid approved by Underwriters for
Class 1, Group D, hazardous locations. Valves shall be
fully automatic (requiring no manual operation to reopen
the valve after the valve has shutoff the gas supply).
The solenoid valve shall be protected by a brass or
bronze body strainer with stainless steel screen. For
pipes up to and including 2" in size, strainer shall be
Automatic Switch Co., Catalog No. 8600, or Muessco No.
351. For pipe 2½" and larger in size, strainer shall be
Muessco No. 352. Valve shall be Automatic Switch Co.
(ASCO) Bulletin No. 8215 with continuous duty class H
insulation coil for low pressure of the size shown on
plan.
B.
Relay Panel: Relay controllers operating the solenoid to
the master gas control valve shall be provided in a NEMA
Type 1 enclosure, like the ASCO model# 108D90C for AC
type panel or 108D10C for DC type panel. The relay shall
open and de-energize the solenoid, but upon activation of
the valve, the flow of gas shall not resume until an
authorized person re-activates a key switch. Thus, the
likelihood of an accidental gas leak may be avoided.
2.05 VENTED CABINET FOR THE MASTER GAS CONTROL VALVE
A.
NYCSCA
Master Gas control valve assembly shall be installed
within a vented enclosure or vented cabinet. If enclosed
in a vented cabinet, cabinet shall be sized in accordance
with pipeline size and to allow for maintenance of the
assembly. Cabinet shall be constructed of 16 gage steel
box and 14 gage steel door. All trim shall be 3/4" arcwelded and ground smooth. Cabinet located in the Kitchen
Area shall be fabricated of 18 gage type 304 stainless
steel.
Door shall be louvered vented type (top and
bottom) with continuous piano hinge and key operated
GAS PIPING SYSTEM 15416 - 9
11/30/15
DESIGN NO. _____
cylinder lock with dust shutter. Cabinet other than the
one located in the Kitchen Area shall have prime baked
coat of rust inhibitive electrostatic powder, baked, grey
enamel, with finish to match room color. Cabinet shall
be manufactured by Karp Associates Inc., Model #KRVB for
recessed and Model #KSMB for surface mounted type or
Acudor Products Inc., Model #ARVB for recessed and Model
#ASVB for surface mounted type.
2.06 CENTRIFUGAL GAS BOOSTER SYSTEM
A.
1
B.
General
1.
The contractor shall furnish a complete UL listed
gas booster system which shall be capable of
delivering a volume of natural gas while elevating
gas pressure to a level required to adequately
operate the gas fired boiler plant or roof-top
units. The system shall contain all the required
devices in order to provide a completely automatic
operating system in full accordance with the
requirements of the utility company and the
building code.
2.
The system shall include but not be limited to:
appropriately sized gas booster pumps, check
valves, gas pressure switches, heat exchanger,
lubricated plug valves, flexible pipe couplings,
gas pressure gauges, pressure and flow compensation
module, control and indicating devices, and field
support as specified hereafter.
3.
The entire gas booster system shall be provided on
a skid mounted unit. The supplier shall be
responsible for all aspects of design, coordination
and operation of all components of the system
including integration with all gas-fired mechanical
equipment.
Hermetically Sealed Centrifugal Gas Booster Pump
1.
NYCSCA
The gas booster system shall consist of duplex
pumps for a building heated only by gas-fired
rooftop units and simplex pump if boiler(s) running
on dual fuels burner provides for the space
heating. Each gas booster pump shall be UL listed
and of the hermetically sealed type. The design of
the booster shall enclose the direct-coupled motor
and fan in an air tight steel housing without the
requirement of external shaft seals. The fan shall
GAS PIPING SYSTEM 15416 - 10
11/30/15
DESIGN NO. _____
be manufactured of spark resistant aluminum and
shall be accessed through a fully gasket cover
plate assembly.
Duplex gas booster pumps, if applicable, shall
alternate and sequence based on length of time of
operation, cycling, temperature of gas flowing
through the system, and failure mode. Each pump
shall be capable of supplying the required volume
and inlet gas pressure for proper operation of all
gas-fired mechanical equipment.
a.
For ease of installation the booster design
shall provide four (4) different mounting
configurations which shall be determined and
coordinated by the booster manufacturer during
the
time
of
system
design.
These
configuration options shall position the
booster outlet in such a way as to facilitate
piping connections and eliminate excessive
piping pressure loss.
b.
The booster shall include a class 1, Group D,
3600 rpm explosion proof motor which shall be
capable of operating on 208/230/460 volt, 3
phase power.
A factory mounted, UL listed junction box with
sealing unilet shall be provided in order to
make all necessary wiring connections.
The booster shall be equivalent to series HB
as manufactured by Eclipse Combustion Co.,
Model GL-XXXX as manufactured by The Spencer
Turbine Company or ENGB-XXX as manufactured by
Etter Engineering.
C.
Check Valves
Horizontally mounted F. M. approved disk type check valve
shall be installed on the inlet to the gas booster.
Check valves shall be constructed of heavy duty cast iron
with a removable top for ease of inspection and
maintenance and shall have all 316 stainless steel trim
with soft seats.
Check valves shall be designed to
withstand a back pressure differential of a minimum of 10
PSIG across the seat and shall be similar to Eclipse
series 1000.
NYCSCA
GAS PIPING SYSTEM 15416 - 11
11/30/15
D.
DESIGN NO. _____
Recirculation Loop and Heat Exchanger
1.
A cooling recirculation loop shall be provided
which shall be used to provide adequate gas flow in
order to cool the gas booster motor during low flow
conditions.
As an integral part of the recirculation loop an
air to air heat exchanger shall be installed in the
loop piping. The heat exchanger shall be of the
single pass modular type and shall be constructed
of corrosion resistant aluminum.
2.
The heat exchanger shall have a self-contained,
temperature controlled fan and motor assembly which
shall be controlled by the gas booster control
system. The heat exchanger fan shall be operated
when the temperature of the booster discharge is
above setpoint.
Heat exchanger shall be similar to series 100 as
manufactured by Eclipse Combustion.
In the discharge of the heat exchanger the
contractor shall install an additional disk type
check valve sized in accordance with gas booster
manufacturer's recommendations. Check valve shall
be similar in design to that previously specified.
E.
Gas Booster Control System
1.
A completely factory built gas booster control
system shall provide safe, proper automatic
operation of the gas booster pump.
The control system shall be obtained from one
vendor who shall be responsible for all aspects of
design,
coordination
and
operation
of
all
components of the entire gas booster system. The
control system shall be a standard cataloged item
which has been particularly designed for this
application and shall have had field usage for at
least three (3) years. Nonstandard controllers or
controls not furnished by the booster vendor will
not be acceptable.
Control system
following:
16
NYCSCA
a.
shall
include
as
a
minimum
the
NEMA 7 wall mounted enclosure
GAS PIPING SYSTEM 15416 - 12
11/30/15
DESIGN NO. _____
6
b.
Fusible disconnect switch with external handle
c.
NEMA rated magnetic motor starter
overload protection for booster
d.
Motor contactor
required)
e.
Indicating lights for: Power on, Booster on,
Low Gas Pressure and Heat exchanger on (when
required).
f.
Digital temperature controller with remote
sensor for heat exchanger (when required).
g.
Booster on/off switch
h.
4" alarm bell with silencing switch: to ring
on low gas pressure
i.
Low gas pressure switch
j.
Engraved nameplates for all components
k.
Numbered terminal strips for field connection
l.
Electronic pressure and gas flow compensation
module
m.
Lon (or Ethernet) Communication module which
shall provide integration of the controller
into the BMS by the TCC. If required the
vendor shall provide a gateway from the
proprietary protocol to Lon, completely preconfigured
for
communication
via
Lon
connection.
Booster control
series HBP.
2.
for
system
heat
shall
exchanger
be
with
(when
equivalent
to
Wired to the gas booster control system shall be a
UL and FM listed low gas pressure switch which
shall be set to open when inlet gas booster
pressure falls to 3" WC.
When the switch opens it shall de-energize the
booster motor control circuit disabling the
booster. The switch shall also indicate a low gas
NYCSCA
GAS PIPING SYSTEM 15416 - 13
11/30/15
DESIGN NO. _____
pressure alarm on the front of the gas booster
control panel.
The low gas pressure switch shall be explosionproof, manual reset type and shall have an
adjustment range of 1" to 30" WC. The switch shall
be constructed in such a way as to allow for
adjustment of the control setpoint without opening
the explosion proof housing. Venting of the switch
shall not be required.
The low gas pressure switch shall be similar to
Eclipse model #AETECH 10036962
A pressure and gas flow compensation module shall
provide for interlocking the gas booster pump(s)
with all mechanical equipment needing gas pressure
elevated above that which is guaranteed by the
utility company. The pressure and gas flow control
module shall include a factory-built pipe manifold
with a manual by-pass that monitors the pressure
and flow status in the gas discharge piping
downstream of the booster pump. Valve and actuator
component of the flow and pressure compensation
module shall be made of aluminum and shall operate
safely in temperature ranging from -5°F to 140°F.
Valve shall maintain a constant, lockable, field
adjustable and precisely regulated pressure and gas
volume in the discharge piping at all times.
Pressure and flow compensation module shall be
similar to the PCFM series as manufactured by
AETECH or an approved equal. Provide UL listing and
CSA approval for the valve & actuator.
Based on demand from gas–fired equipment and
pressure variations in the building system piping,
the compensation module shall start and stop the
gas booster. Provide a time delay or field
adjustable setting to eliminate pump short cycling.
Cable connectors and other electrical components of
the pressure and flow compensation module shall be
rated for explosion-proof application.
6
NYCSCA
The
communication
module
shall
provide
the
following information regarding the gas booster
pump: System Status, Inlet Pressure, Outlet
Pressure, Low Inlet Pressure Alarm, Low Discharge
Pressure Alarm, Booster Pump Runtime Total, Heat
Exchanger Runtime Total, Common Maintenance Alarm.
GAS PIPING SYSTEM 15416 - 14
11/30/15
F.
DESIGN NO. _____
Coordination, Field Service and Quality Assurance
1.
2.
In order to provide a properly operating gas
booster system the manufacturer shall review all
aspects of the installation in advance of gas
piping being installed, including gas piping layout
shop drawings, boiler/ or roof top units gas train
pressure requirements, and total load requirements
for the proposed project.
Upon verification of
this information the manufacturer shall furnish a
gas booster design data sheet to the Authority and
the utility company outlining the parameters for
system design including but not limited to:
a.
No. of boilers/ or roof top units, total CFH
minimum and maximum.
b.
Gas booster inlet pressure
c.
Gas pressure required at boiler/ roof top unit
train inlet
d.
Total
equivalent
including fittings
e.
Discharge pipe diameter
f.
Total discharge pipe pressure loss
g.
Selected gas booster Model NO.
h.
Booster flow capacity (CFH)
i.
Booster discharge pressure (WC)
j.
Total discharge pressure (WC)
k.
Booster inlet pipe diameter
length
of
gas
piping
The booster manufacturer shall provide all required
field
service
assistance
for
installation
supervision and equipment start up.
Upon completion of system start up, the booster
manufacturer shall furnish a written certification
to the Authority and the utility company that the
gas booster system operates in accordance with
design standards.
NYCSCA
GAS PIPING SYSTEM 15416 - 15
11/30/15
DESIGN NO. _____
3.
After successful system start up, the gas booster
manufacturer shall provide one (1) year field
service for all system components. In addition, a
five (5) year extended warranty agreement shall be
made available from the booster manufacturer in
order to provide reliable future service and
operation of the booster system.
2.07 GAS LUBRICATED PLUG VALVES
A.
Lubricated plug valves for use on gas service and gas
meter piping shall be as approved by the serving utility.
B.
Lubricated plug valves for use on gas distribution
piping; mains, branches and base of risers shall be cast
iron body, rated for 200 pounds cold working pressure and
shall be wrench operated, except valves 10" and larger
which shall be worm gear operated.
C.
Lubricated plug valves 2" and smaller shall be short
pattern threaded; 2½" and larger shall be regular pattern
flanged.
D.
Lubricated plug valves shall be Nordstrom Valves Inc.
Fig. 142 for sizes 2" and smaller, Fig. 115 for sizes 2½"
through 4" inclusive, Fig. 165 for sizes 6" and 8", and
Fig. 169 for sizes 10" and larger; or Walworth Fig. 1796
for sizes 2" and smaller, Fig. 1700F for sizes 2½"
through 8", and Fig. 1707F for sizes 10" and larger.
2.08 GAS COCKS
A.
Gas cocks shall be for use only as manual gas shut-off
valves at each piece of gas burning equipment; shall be
of the plug type, bronze construction with check, nut and
washer bottom and tee handle.
B.
Gas cocks shall be Fig. 10596 as manufactured by A. Y. Mc
Donald Mfg. Co., or Series 52 as manufactured by Conbraco
Industries Inc.
C.
Gas cocks shall only be used on piping 1" and smaller.
2.09 FLEXIBLE RANGES CONNECTORS
A.
NYCSCA
Flexible range connectors shall be all metal flexible
connectors suitable for the service required and listed
for use with gas appliances by the American Gas
Association (AGA).
Connectors shall also be National
Sanitation Foundation (NSF) design certified and have a
GAS PIPING SYSTEM 15416 - 16
11/30/15
DESIGN NO. _____
City of New York Material Equipment Acceptance (MEA)
approval.
B.
Flexible connectors shall be of corrugated stainless
steel, encased in stainless steel braid, covered with a
thick super-flex PVC coating.
C.
Flexible range connectors for food service equipment
shall be heavy duty, listed and labeled as complying with
ANSI Z21.69. Connectors for use with Commercial Grade
Equipment shall be as manufactured by Dormon Mfg. Company
and T&S Brass and Bronze Works, Inc. Safe-T-Link, HGSeries.
2.10 GAS METER ROOM SIGN
A.
Provide a sign made of two colors laminated engravers
stock phenolic, 1/16" minimum thickness, machine engraved
to expose inner core color (white). Sign to be provided
with uniform margins and character size 1”" high.
B.
Sign to read:
GAS METER ROOM:
NO STORAGE PERMITTED.
2.11 GAS METER
A.
6
6
Secure from the utility company gas meter and other
ancillaries such as gas regulator that may be necessary
for the complete installation of the gas system.
For projects involving LonWorks network, the contractor
shall request pulsating type gas meter, capable of
transmitting signal outputs to the energy management
system (part of the BMS) that is provided by the
Temperature Control Contractor, TCC.
Pulsating gas meter shall come equipped with dry contacts
(2 wire Form A, single channel; 3 wire Form C, dual
channel) that will enable among other things conversion
of the pulse signal outputs into therms of natural gas
consumed. Coordinate request for the gas meter with the
TCC.
2.12 GAS SUB-METER & GAS PRESSURE TRANSMITTER
A.
7
NYCSCA
This contractor shall furnish and install gas submeter(s), which are to be integrated with the building
management system (BMS). Interfacing gas sub-meters with
the BMS shall allow for recording data on gas
GAS PIPING SYSTEM 15416 - 17
11/30/15
DESIGN NO. _____
consumption, registering gas load trending and monitoring
of gas pressure delivered to gas-burning equipments.
1.
Gas sub-meter(s) shall be positive displacement and
rotary type with pulse out signals and shall be
capable of measuring natural flows with low
pressure drop across the sub-meter. Gas submeter(s) shall be designed with high rangeability
at 40:1 and 1% accuracy. Sub-meter(s) shall contain
inherent feature that provides for temperature
compensation. Enclosure for digital display shall
be
UV
resistant
polycarbonate
and
ambient
temperatures ranging from -40°F to 160°F shall have
no effect on sub-meters performance.
2.
Approved model #: Elster American Meter Company –
Series RPM with Honeywell TCI.
3.
Sub-meter(s) shall meet the following codes and
standards:
4.
NYCSCA
a.
ASME Boiler & pressure Vessel Code, Section
VIII
b.
ANSI B16.5 Flanged Pipe & Fittings
c.
ANSI B31.8 Gas Piping
d.
ANSI B109.3 Rotary Gas Meters (92)
e.
49 CFR 192 Min. Federal Safety Standards
f.
Underwriter’s Laboratory (UL)
Temperature correction feature shall be provided
for sub-meter to compensate for variations in
density and to avoid the resulting metering errors.
a.
LCD display of input gas temperature -40°F to
160°F
b.
Continuous fix factor correction for pressure
c.
Membrane push button and user-configurable
alphanumeric LCD for display of: test,
uncorrected volume, corrected volume, fixed–
set pressure, live temperature, battery
voltage, live flow and electronic uncorrected
backup.
GAS PIPING SYSTEM 15416 - 18
11/30/15
B.
DESIGN NO. _____
d.
Programmable call-in (scheduled and on alarms)
e.
Field–programmable firmware
port or infrared port
f.
Two Form-A volume pulse outputs and one Form–A
alarm pulse output.
g.
Audit- trail memory – 40 days of daily
corrected volume, uncorrected volume, and
average temperature
h.
Low power requirements – 4 year + on four (4)
D-cell alkaline batteries
through
serial
Gas Pressure Transmitter
1. This device is furnished, installed and wired by the
temperature control contractor (TCC). Plumbing
contractor shall provide a fitting for insertion of
the gas pressure sensor into the supply header piping
to gas-fired equipment.
2.13 GAS PRESSURE REGULATORS
A.
Types
8
1.
Service Pressure Regulator(s): Gas service pressure
regulator(s) shall be as provided by the serving
utility company.
2.
Line
Pressure
Regulator(s):
Line
pressure
regulator(s) shall be provided for precise control
of the gas pressure and flow rate delivered to gasburning appliances.
15
NYCSCA
a.
Regulators shall be installed where line
pressure exceeds the gas pressure ratings for
appliances supplied thereof and as shown on
Drawings.
b.
Regulators shall be required to ensure
protection for gas-fired appliances against
emergency gas exposure of at least 2 psig.
c.
Regulators shall comply with ANSI Z21.80 and
fabricated with internal parts that are
corrosion–resistant.
Regulators shall be
capable of maintaining outlet pressure under
no flow condition or dead end lock up
GAS PIPING SYSTEM 15416 - 19
11/30/15
DESIGN NO. _____
situation. Approved model # shall be GOVERNOR
by Pietro Fiorentini or other approved equal.
B.
Venting of Gas Regulators: If located indoors, gas
pressure regulators shall have an independent vent pipe
routed to the outside of the building. The vent pipe
shall be arranged so as to preclude the entry of water or
foreign objects. Separate vent piping is not required if
the regulator is less than 1¼”, is equipped with and is
labeled for utilization with approved vent-limiting
device
installed
as
per
the
manufacturer’s
recommendations.
2.14 FLEXIBLE GAS PIPE PASSING THROUGH A BUILDING SEISMIC JOINT
17
A.
A braided flexible stainless steel multiple legs pipe
assembly shall be installed in gas piping system passing
through a building seismic joint or building expansion
joint. When required, the flexible pipe connector shall
also be provided between floors to restrain vertical
displacement in gas piping arrangement that is caused by
a seismic event.
B.
Flexible stainless pipe connector shall incorporate
multiple leg sections that are formed on annular
corrugated stainless steel hose. The connector shall
compensate for pipe movements in 6 degrees of freedom: 3
coordinate axes, plus simultaneous rotation around those
axes.
Connector shall be capable to restrain
displacement without failure due to seismic forces and is
subject to special inspection as required by Section BC
1707.7 of the 2014 NYC Building Code and Section
FGC 403.5.2.
C.
Provide
acceptance
by
the
Office
of
Technical
Certification and Research (OTCR) to utilize this
flexible connector for seismic resistance in gas piping
in NYC. In addition, connector shall be tested, listed
and labeled to UL 536-2003 by an approved agency.
Acceptable braided flexible stainless steel pipe
connector shall be similar to TRI-FLEX LOOP as
manufactured by Flex Hose.
2.15 CATHODIC PROTECTION
A.
General Requirements
1.
NYCSCA
Underground steel gas piping, in addition to being
mill-wrapped, shall be cathodically protected for
safeguarding against corrosion caused by contact
GAS PIPING SYSTEM 15416 - 20
11/30/15
DESIGN NO. _____
with the ground and as per the requirements of the
serving utility company.
Cathodic protection is
required on both underground service as well as
underground distribution gas piping.
2.
This contractor shall hire an engineer or a
specialist to design the cathodic protection
system.
The developed cathodic protection plan
shall conform to standards, drawings, rules and
regulations established by the serving utility
company for pipe corrosion control and cathodic
protection.
3.
This contractor is responsible for securing from
the serving utility company all necessary approvals
and affidavit for “New Steel Gas Pipe Corrosion
Record” that CID/BCC may require before granting
the “Pink/Blue Card” that allows the utility to
activate the gas service.
10
B.
System Components
Cathodic protection intended for underground steel gas
piping installation shall include but not be limited to:
1.
Coating
Factory-installed mill wrapped piping needs not be
coated unless the wrapping becomes loose or section
of the piping or fitting becomes bare during the
installation.
Apply coating specified by the
serving utility company, such as mastic, cold tape
or hot coal tar enamel.
a.
11
11
NYCSCA
b.
For
projects where National Grid is the
serving utility, acceptable coating products
are:
1)
Polyken Technologies Pipeline Primer
#1027 in conjunction with Polyken Tape
#936 or Polyken Gas UtilityTape or equal.
OR
2)
Tapecoat
Company
CT
Coldprime
in
conjunction with Tapecoat Pipe Tape H-30
or H-50.
For projects where
utility, use:
Con Ed
is
the
serving
GAS PIPING SYSTEM 15416 - 21
11/30/15
DESIGN NO. _____
1)
2)
For pipe less than and equal to 4 inches
in diameter
a)
X-Tru:Bredero Price Co. or Liberty
Coating Company
b)
Pritec: Bredero Price Co. or Liberty
Coating Company
For pipe sizes 6 inches and larger
1.
2.
Pritec: Bredero Price Co. or Liberty
Coating Company
Insulating Joints
Provide for electrical isolation of underground
steel pipe with above-ground steel pipe. Location
of insulators shall be guided by criteria imposed
by the serving utility.
3.
Electrical Continuity
Provide bonding wire, wire connector and thermit
weld (aka “cadweld”) for preservation of electrical
continuity across couplings, valves and fittings
that connect the underground steel pipe.
4.
Magnesium Anodes
Size selection and required number of anodes shall
be based upon pipe diameter, length of run and
other guidelines enforced by the serving utility
company. Magnesium anodes must be provided with #10
AWG copper wire and be thermite welded to the
underground gas pipe. Copper wire must carry black
insulation
11
11
5.
a.
Minimum anode size for pipe within National
Grid territory, irrespective of the size of
the pipe diameter and up to 10 feet of pipe
run, is 3 pounds.
b.
The minimum anode size for pipe within Con Ed
territory is 17 pounds.
Test Stations
Provide at ends of underground pipe runs test
stations to monitor the effectiveness of the
NYCSCA
GAS PIPING SYSTEM 15416 - 22
11/30/15
DESIGN NO. _____
installed cathodic protection system.
Test
stations shall be made up by #10 AWG copper wire
(white insulation) that is thermite welded to the
underground pipe and anode wires (black insulation)
that are all spliced inside an easily accessible 4”
X 4” electrical box with cover.
6.
Pipe Tracer
For safety and to facilitate detection of buried
gas piping during future soil excavation, provide
pipe tracer. Tape labeled “Warning – Buried Gas
Lines Below” shall be placed at a minimum 1 foot on
top of the installed piping and it shall be routed
the length of the pipe run.
PART 3 - EXECUTION
3.01 GENERAL
A.
Make the necessary arrangements with the Utility Company
to bring connection to points shown on the Drawings, or
as required by the Utility Company and provide the
necessary pipe, fittings, valves, service, cocks,
governors, etc., to extend these services to the gas
system.
B.
Exact locations of gas service at property line shall be
secured from the Utility Company by this division and
shall be coordinated with electric service location,
sewers and water service.
C.
As part of the gas service and meter piping certain
equipment, such as meters, regulators, security valves,
plug valves, relief valves and compression coupling will
be furnished by the Utility Company. However, the
Contractor shall provide any additional equipment and
materials not furnished by the Utility Company to make
this service complete.
D.
Gas service shall be extended from the property line into
the building. Gas service line shall pitch toward the
building and be provided with drip leg and plugged
outlet, or drip pot, as required by the Utility.
3.02 INSTALLATION
A.
NYCSCA
Gas service and gas distribution piping, number and
distribution of appliances, shall be installed as
indicated on the Drawings and shall be in accordance with
GAS PIPING SYSTEM 15416 - 23
11/30/15
DESIGN NO. _____
the rules and regulations of the Gas Company and
according to the latest regulations of the Administrative
Code of the City of New York and shall meet the
requirement of the Department of Buildings.
1.
Contractor shall arrange for inspection and
adjustment of all gas appliances of the contract,
so that they will properly and safely operate with
natural gas.
B.
The Contractor shall notify the Authority when all is
ready for the Gas Company to extend their service pipe to
the street line; and again after tests, when all is in
readiness for the installation of the meters. The meters,
of the pulsating kind if a LonWorks network is provided,
shall then be connected with the service pipes, and with
the several lines of distributing pipes. The setting,
piping and connecting up of the meters shall be done in
accordance with the rules of the Gas Company.
C.
Main distributing pipes shall be suspended from the
cellar or basement ceilings.
Connections of branches
with main shall be made with malleable iron right and
left couplings and nipples.
Whenever gas lines are
unavoidably trapped an accessible drip shall be provided
with access door to same.
NYCSCA
1.
Joint sealing materials (pipe dope) used with
screwed (threaded) fitting shall be applied
sparingly and only to the male threads of pipe
joints. The burrs made in cutting the pipe shall be
removed. Plugged tees in place of elbows shall be
used wherever directed. Where pipes of different
sizes come together, reducing fittings shall be
used. No bushing will be permitted.
2.
Piping installed below grade shall be connected by
welding by approved certified welders, or with
compression type fittings as specified and approved
by the Gas Company.
a.
Service piping below grade shall be mill
wrapped in accordance with the Gas Company
regulations.
b.
Backfill operations shall be started only
after welding inspection, coating inspection
and testing have been completed as per
regulations of the Gas Company.
GAS PIPING SYSTEM 15416 - 24
11/30/15
DESIGN NO. _____
3.
Inter-connections between piping
pressure levels is not permitted.
at
different
D.
Gas meter piping supplying gas to a building at a
pressure in excess of 1/2 PSIG shall be provided with a
pressure regulator to reduce the gas pressure to 1/2 PSIG
or less unless noted otherwise.
E.
Provide gas lubricated plug valves where specified, shown
on Drawings or otherwise required for control of gas in
the distribution piping; mains, branches and at the base
of each riser. Install sleeves in floors for risers to
pass through. An accessible manual gas cock or lubricated
plug valve of the same size as the pipe shall be
installed at each piece of gas burning equipment, to
allow for isolation of the equipment and where indicated
on Drawings. All valves and cocks for gas throughout the
building shall be tagged with numbered metal tags.
Install drip, consisting of nipple and cap, at the base
of all risers and changes in elevation.
F.
Gas valves shall not be installed in concealed locations
and furnace plenums.
Wall enclosures, pipe spaces or
other recess in which gas valves are installed must be
vented to an adjoining ventilated area.
G.
In
no
case
shall
a
gas
pipe
run
through
a
heat/ventilation duct or stairwell. The Contractor shall
do all cutting and boring of holes necessary for
extending pipes and branches, making all necessary
openings in walls, and shall make all repairs to same.
H.
When interruptible gas is used for boiler operation two
gas meters shall be installed. One meter shall be for
firm gas, for all purposes with separate lines for
kitchen, boiler pilot lights, gas hot water heater,
classrooms and laboratories. The second gas meter shall
be for interruptible gas for boiler operation. Each line
shall be controlled by a separate valve near meter.
I.
Only gas ranges in Home Economics units may be connected
with "Flexible Range Connectors". All other gas burning
equipment must be connected with a rigid connection.
J.
Final connections to burner pilot lights and boiler gas
trains shall be made by the Plumbing Contractor.
K.
All gas piping to equipment on roof shall be run on roof
and be supported securely as specified in Section 15411
Hangers and Supports.
NYCSCA
GAS PIPING SYSTEM 15416 - 25
11/30/15
DESIGN NO. _____
3.03 GAS PIPING VENTING
A.
Gas service piping and gas meter piping shall have vent
and relief piping installed and sized in full accordance
with the requirements of the serving utility.
B.
Gas train venting (Boilers and Water Heater):
8
3
NYCSCA
1.
Gas vents from boilers shall not be combined with
the water heater gas vents.
2.
Gas vents from one boiler shall not be manifolded
to gas vents from other boilers.
3.
All normally open vent valves must
separately and directly to the outside.
4.
Vent piping from pilot system (firm gas) and main
burner system (interruptible gas) cannot be
combined.
5.
Gas vents from gas pressure regulator and high and
low gas pressure switches can be manifolded and
routed to outside the building.
6.
All gas vents shall be equipped with a utility
approved weatherproof vent cap.
be
piped
a.
Vents shall terminate at least 10' laterally
from any building opening, window, door or
ventilation air intake duct.
Vents shall
terminate a minimum of 10' above grade.
b.
If the above is not possible due to the
location of existing windows, then vents shall
terminate a minimum of 18" above the parapet.
Vents shall terminate at least 10' away from
any chimney. Vents shall not be routed on the
front façade of the building.
7.
Vents outlets shall not be located under a window
overhang projection.
8.
The size of the vent lines shall be as indicated on
the Drawings.
If the installation of the vent
lines differ from the Drawings, the Contractor
shall increase the size of the vents as directed by
the Engineer at no additional cost to the
Authority.
GAS PIPING SYSTEM 15416 - 26
11/30/15
DESIGN NO. _____
9.
A normally open vent valve shall also be installed
between the two safety shut off pilot valves ONLY
for burners with fuel input OVER 12,500,000 BTUH
(nominally 300 boiler horsepower). This pilot line
normally open vent valve must be piped separately
and directly to the outside.
The pilot line
normally open vent valve piping shall not be
combined with the interruptible line normally open
vent valve piping.
3.04 GAS SAFETY SHUT-OFF VALVES
A.
4
B.
C.
Gas safety shut-off valves shall be installed within the
near-gas-meter piping;
1.
On the interruptible gas line downstream of its
meter and before the centrifugal gas booster system
(if installed), and,
2.
On the firm gas line downstream of its meter and
before any branch take-offs.
Gas safety shut-off valves shall be wired to the gas leak
detection system and shall function to shut off all gas
supply to the building upon;
1.
Action of the gas leak detection system (alarm
condition), and,
2.
Loss of normal electrical power.
Valves must be manually reset upon correction of the
alarm condition or restoration of electrical power.
3.05 GAS SAFETY SHUT-OFF VALVES; OPERATING SIGN
4
A.
Install one sign for each boiler burner or rooftop unit
control panels.
B.
Attach sign to boiler burner/ roof top unit control panel
door using adhesive specifically designed for the purpose
or mount sign on wall or other conspicuous location
adjacent to the boiler burner control panel.
Do not
penetrate door with fasteners.
3.06 MASTER GAS CONTROL VALVE
A.
NYCSCA
Install master gas control valve in a vented cabinet or
vented enclosure in location as indicated on Drawings. In
GAS PIPING SYSTEM 15416 - 27
11/30/15
DESIGN NO. _____
no case shall the valve be located within the hung
ceiling space.
B.
Install a gas cock (shut-off valve) (tee handle) or
lubricated plug valve on each side of solenoid valve and
install a by-pass connection with shut off valve so that
the solenoid valve may be removed for repairs.
See
Drawings.
3.07 CENTRIFUGAL GAS BOOSTER SYSTEM
A.
Install centrifugal gas booster system where indicated on
the Drawings.
B.
The entire gas booster system shall be installed in full
compliance with the manufacturer's design standards.
System shall be certified as herein before specified.
3.08 GAS METER ROOM VENTILATION
A.
Gas meter room shall be ventilated by one of the
following methods and/or as indicated on the Drawings:
1.
A louvered opening to the outside air in the
exterior wall with a minimum free area of not less
than 30 square inches.
3.09 FLEXIBLE RANGES CONNECTORS
A.
Flexible range connectors shall be of the minimum
practical length and shall not extend from one room to
another nor pass through any walls, partitions, ceilings
or floors.
B.
Flexible connectors shall not be used in any concealed
locations.
C.
Flexible connectors shall be protected against physical
and thermal damage and shall be provided with gas shut
off valves (cocks) in readily accessible locations in
rigid piping upstream from the flexible connectors.
3.10 PAINTING
A.
Mill-wrapped piping shall not be painted.
B.
Painting of gas pipe shall be done after required testing
is performed and accepted. Interior gas pipe shall not be
painted unless otherwise noted on drawings. All painted
18
NYCSCA
GAS PIPING SYSTEM 15416 - 28
11/30/15
DESIGN NO. _____
and unpainted piping shall be labeled in accordance with
the “Labeling” article below.
C.
Exterior Piping
1.
Piping Exposed to Public View: One coat of primer
and 2 coats of finish paint of color selected by
architect.
2.
Piping not exposed to public view, such as that
running on roof: Once coat of primer and 1 coating
of finish paint in safety yellow.
D.
Interior Piping (where indicated on Drawings):
One
coat of primer and 2 coats of finish paint of color
selected by architect.
E.
For additional materials and method of painting, refer to
Section 09900 - Painting.
3.11 LABELING
2
A.
General Requirements:
Gas piping shall have marker
labels indicating the pipe as a gas line and the
operating pressure within that pipe. Refer to Section
15431.
B.
All valves shall be suitably tagged to indicate the
operating pressure level within the distribution piping.
3.12 GAS METER ROOM SIGN
A.
Gas
meter
room
sign
shall
be
permanently
and
conspicuously posted on the exterior of the gas meter
room door.
3.13 DEMONSTRATION
A.
NYCSCA
The services of a factory trained representative shall be
available on the job site for start-up and for
instructing the New York City Department of Education
Custodian or Building Manager in the operation and
maintenance of the gas safety shut-off valves and the
centrifugal gas booster system.
GAS PIPING SYSTEM 15416 - 29
11/30/15
DESIGN NO. _____
3.14 FIELD QUALITY CONTROL
A.
Testing
1.
B.
a.
Gas pipe welding is subject to all tests
required
by
the
Authority
and
Special
Inspection requirements of the 2014 NYC
Building Code and Fuel Gas Code.
b.
Cooperate with the Testing
making all required tests.
Laboratory
in
Inspection
1.
NYCSCA
General
Testing Laboratory
a.
The Authority will engage a Testing Laboratory
or Special Inspection Agency to provide the
inspection and specialty testing.
b.
The Testing Laboratory will be responsible to
and under the supervision of a Special
Inspector.
c.
The laboratory
testing.
will
perform
the
following
1)
All welded gas distribution piping, less
than or equal to 3 psig: In addition to
independent pressure testing of the
entire system, at least ten (10) percent
of all welds otherwise not required to be
non-destructively tested will be subject
to non-destructive testing (radiographed
and/or subjected to ultrasonic testing).
The minimum sampling shall be five (5)
welds. All welds shall be radiographed
at the Contractor’s expense if any
failure of any of the samples is found.
Contractor shall make all necessary
repairs at no cost to the Authority.
2)
All gas distribution and meter piping
over 3 psig:
All welds will be
radiographed.
GAS PIPING SYSTEM 15416 - 30
11/30/15
DESIGN NO. _____
2.
17
c.
Special Inspector
a.
The Authority will assign a Special Inspector
to supervise the testing of gas pipe welding
in accordance with Section BC 1704.19,
regardless of gas pressure.
The Special
Inspector will verify the qualifications of
the welder
b.
Seismic inspection will be performed in
accordance with Sections BC 1707.7 and FGC
403.5.3
Notification: Before any work is commenced on an
item of construction requiring Special Inspection,
all
persons
responsible
for
such
Special
Inspections shall be notified in writing at least
seventy two (72) hours prior to such commencement.
3.15 INSTALLATION OF GAS SUB-METER AND GAS PRESSURE TRANSMITTER
A.
Coordinate with the temperature control contractor (TCC)
for instructions on where to locate and to install gas
sub-meters. Sub-meters shall be kept at minimum 3 feet
away from heating boiler, water heater or other sources
of ignition. If placed in a room or inside a space,
combustible material my not be stored within 5 feet of
the sub-meter. In addition, such room or space shall be
ventilated.
B.
For future maintenance and replacement of the device,
provide valve-by-pass and unions around the sub-meter(s).
1. Plumbing Contractor shall coordinate installation of
gas sub-meters with the temperature control contractor
(TCC) who is responsible for interfacing sub- meters’
output signals with the projects’ LONWORKS network.
C.
The plumbing contractor shall coordinate with the TCC for
the proper location, orientation and other pertinent
considerations to ensure accurate and proper orientation
and maintenance of the gas pressure transmitters.
3.16 FLEXIBLE GAS PIPE PASSING THROUGH A BUILDING SEISMIC JOINT
A.
NYCSCA
Install braided stainless steel flexible pipe connector
at building expansion joints and/or where required to
manage pipe movement that is due to a seismic event. Pipe
connector should not be subjected to torsional, tensile
or excessive bending stresses.
GAS PIPING SYSTEM 15416 - 31
11/30/15
DESIGN NO. _____
1.
Installation guidelines shall
manufacturer’s instructions.
be
as
per
the
2.
Protect flexible pipe connector against mechanical
injury.
3.
Installation of the flexible pipe connector is
subject to the special inspection requirements of
Chapter 17 of the NYC Building Code.
4.
Special inspector shall possess qualification
requirements for “mechanical systems” category as
defined in 1 RCNY section 101-06, Appendix A.
5.
All shipments and deliveries of this flexible pipe
shall be accompanied by a certificate or label
declaring that the materials shipped or delivered
are equivalent to those tested and approved.
3.17 INSTALLATION OF CATHODIC PROTECTION
A.
Before backfilling, all piping shall be visually
inspected to verify that coating or mill wrapping was not
damaged during the installation and that no bare pipe
area remains exposed.
B.
Before covering the pipe trench, provide pipe tracer for
safety reasons and for protection during future ground
excavation.
C.
An acceptance test shall be performed to ascertain the
effectiveness of the cathodic protection system installed
for underground corrosion prevention. National Grid
reserves the right to require an acceptance test before
gas service can be turned on. Rules established by Con
Edison make the acceptance test compulsory.
D.
Prior to backfilling pipe trenches, the contractor shall
make the necessary arrangements with the serving utility
company to inspect the installed work and to provide any
relevant sign-off affidavit such as the “New Steel Gas
Pipe Corrosion Record” form that Con Edison issues.
E.
This contractor shall obtain from the utility company
having jurisdiction a letter accepting the installed
cathodic protection system and authorizing backfilling of
the pip
e trench, as part of the sign-off requirement
and the issuance of a pink/blue slip.
NYCSCA
GAS PIPING SYSTEM 15416 - 32
11/30/15
DESIGN NO. _____
3.18 INSTALLATION OF GAS PRESSURE REGULATORS
A.
5
Provide access to the regulator and ensure that the
device is properly installed by following the arrow
indicating the gas flow direction.
Line pressure
regulator must be installed in a horizontal position if
the device is equipped with a vent limiter.
3.19 COMMISSIONING REQUIREMENTS
A.
B.
Plumbing Contractor shall comply with the Commissioning
Requirements of Contract Specification S01660 for gas
piping system.
All gas piping hydrostatic testing and gas booster pump
testing shall be completed prior to commencement of the
commissioning process of the domestic water heater.
END OF SECTION
HC
11/30/15
Notes to Specifier (Delete from Specification)
1.
Centrifugal Gas Booster System shall be specified in its
entirety when a pressure above 4" WC is required and low
pressure (4" WC) gas is supplied by the Consolidated Edison
Company.
2.
Be sure to include specification Section 15431: "Tags, charts
and identifications".
3.
Verify that the gas vents are indicated on the Contract
Drawings.
Gas vent piping shall be located to be as
unobtrusive as possible. The 2014 NYC Plumbing Code requires
a minimum vent termination of 2’-0” from any opening be
maintained, but the SCA preferred distance is 10’-0” as per
the specification. Designer may use discretion if a lesser
number than 10’-0” will result in a less obtrusive layout of
the vent piping. Where gas vent pipe must run up the building
to above the parapet level, select paint color(s) appropriate
for the façade color(s) to minimize the impact of the vent on
the building aesthetic.
4.
Install Gas safety shut-off valve when any of the following
occurs:
a.
NYCSCA
Either a gas meter room or a gas-fired water heater is
located inside the building.
GAS PIPING SYSTEM 15416 - 33
11/30/15
DESIGN NO. _____
b.
Boilers are installed inside the building.
c.
Gas supply piping to water heater or any other gasburning equipment
Delete articles if valve is not required.
5.
This article is intended for projects that must comply with the
NYC Green Schools Rating System and projects that must comply
with the system commissioning requirements of the 2014 NYC
Energy Conservation Code (generally all capacity projects and
CIP projects that have domestic water heater system work).
Delete for all other projects.
6.
Plumbing system designer shall coordinate power requirement
with the electrical engineer. The plumbing engineer shall also
coordinate these system features with the HVAC system designer
such that the following occurs:
a.
If the HVAC control system is a full BMS (15970), then
the gas booster pump shall be specified to be furnished
with the communication option and the gas meters shall be
specified with pulse outputs.
b.
If the HVAC control system is DDC-Only (15971), then the
communication module shall not be specified with pulse
outputs. Remove these references from this section.
c.
7.
Capital projects require a Building Management System (BMS).
For these projects, the designer must do building filing that
includes a schedule B for gas sub-meter(s) which are furnished
and installed by the plumbing contractor. The designer must
also show the sub-meter(s) on a gas riser diagram. Designer is
to coordinate power requirement with the electrical engineer
8.
Verify that exterior vent piping is required for regulators
and high/low gas valves for water heaters. Indicate vent
piping on drawings. Vent pipe sizing shall conform to
instructions received from the manufacturer. If regulator is
less than 1¼” and is equipped with a vent- limiter,
independent vent piping is not required.
9.
Plumbing design engineer shall indicate in drawings, specially
gas-riser diagram, a gas safety shut-off valve (Maxon valve)
installed in gas supply piping to waters heaters and other
gas-burning equipments.
NYCSCA
GAS PIPING SYSTEM 15416 - 34
11/30/15
DESIGN NO. _____
10.
Applies
only
jurisdiction.
to
those
projects
within
Con Edison’s
11.
Delete paragraphs and references to the utility company that
doesn’t apply to the project.
12.
This paragraph applies to projects where the utility’s gas
service pressure is 1/2 psig or less.
Project with this
pressure will require a gas booster pump. Delete this
paragraph if the pressure supplied is greater than 1/2 psig.
13.
This paragraph applies to projects where the utility’s gas
service pressure is greater than 1/2 psig but less than 15
psig, even if the utility provides a service regulator to
maintain the pressure at 1/2 psig.
14.
This paragraph applies to projects where high pressure service
(15 psig or greater) is provided, but likely limited to the
boiler room for supplying boilers. Delete if not applicable
to the project.
15.
The designer is to provide line pressure regulators based on
DR 6.1.8 and shall show locations of same, including
calculations, on the drawings.
Even though the utility
provides service regulators to limit distribution piping
pressure in the building to less than 1/2 pisg when the
utility’s street piping pressure is greater than 1/2 psig, the
line regulators are to be provided for mechanical units and
boilers due to the potential for emergency exposure that may
be reached when demand to the unit is stopped.
16.
Where gas booster is placed outdoors or other area
Edit to
indicate that control panel for gas booster pumps when placed
outdoor or other non-gas meter room location shall be rated
NEMA-4, which is suitable for placement in wet locations.
17.
Designer is to ensure that special inspection (TR-1) form is
filed for and is provided for installation of braided
stainless steel multi-legs flexible pipe used in gas system.
18.
Verify with Architect if interior piping may be exposed to
public view inside the building and if so indicate on the
drawings those lines to be painted.
* * *
NYCSCA
GAS PIPING SYSTEM 15416 - 35
11/30/15
DESIGN NO. _____
LIST OF SUBMITTALS
SUBMITTAL
DATE SUBMITTED
DATE APPROVED
Product Data:
______________
_____________
______________
_____________
1.
2.
3.
4.
Mfr's Product Data
Installation Instructions
Capacities
Gas Booster Manufacturer’s
Design Data Sheet
Shop Drawings:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Gas piping materials
Gas Piping Layout
Gas Safety Shut-off Valves
Master Gas Control Valve
Gas Lubricated Plug Valves and Gas Cocks
Gas Pressure Booster System
Strainer
Pipe Joint Compound
Flanges and Gaskets
Pulsating Gas Meter
Relay & Control Panel
Gas Pressure Regulators
Wiring Diagrams:
______________
_____________
Certifications:
______________
_____________
______________
____________
Warranty:
______________
_____________
Con Edison “New Steel Gas
Pipe Corrosion Record”
______________
_____________
1.
2.
Welder Qualifications
Gas Booster Manufacturer’s
Schedule:
1.
10
Installation/Welding
of Gas Piping
* * *
NYCSCA
GAS PIPING SYSTEM 15416 - 36