Corrosion Probes
User Manual
F200-16959-I-MU-0113 rev.02 Des 03
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
Document No.: F200-16959-I-MU-0113
Rev:
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Date:
02
2 of 66
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Contents
Chapter 1
1.1
1.2
1.3
1.4
Chapter 2
2.1
2.2
2.3
Chapter 3
3.1
3.2
3.3
Chapter 4
4.1
INTRODUCTION ....................................................................................................4
How to use this manual ..........................................................................................5
Normative references .............................................................................................6
Conformity to the Pressure Equipment Directive (PED) ..........................................6
Assistance..............................................................................................................7
MAIN DATA ...........................................................................................................8
Guarantee restrictions ............................................................................................8
Equipment Data - Probes .......................................................................................9
2.2.1 Standard ER-probes .................................................................................10
2.2.1.1 ER probe Type Repro A.................................................................11
2.2.1.2 ER probe Type Repro B.................................................................12
2.2.1.3 ER probe Type Repro C ................................................................13
2.2.1.4 ER probe Type Tubular..................................................................14
2.2.1.5 The High Sensitivity ER-probe .......................................................15
2.2.2 LPR-probes ..............................................................................................16
2.2.2.1 LPR probe Type Triple B ...............................................................17
2.2.2.2 LPR probe Type Two electrode B ..................................................18
2.2.2.3 LPR probe Type Two electrode C..................................................19
2.2.2.4 LPR probe Type Triple C ...............................................................20
2.2.3 Galvanic probes........................................................................................21
2.2.3.1 Galvanic probe Type Galvopro B ...................................................22
2.2.3.2 Galvanic probe Type Galvopro C...................................................23
Equipment data - Plugs ........................................................................................24
2.3.1 Hollow plugs .............................................................................................25
TECHNICAL DESCRIPTION................................................................................27
General information ..............................................................................................27
Probes..................................................................................................................28
3.2.1 ER-probes ................................................................................................29
3.2.2 LPR probes...............................................................................................31
3.2.3 Galvanic probes........................................................................................33
Plugs 34
PREPARATION AND INSTALLATION ................................................................35
Probes..................................................................................................................35
4.1.1 Preparation ...............................................................................................35
4.1.2 Tools/equipment .......................................................................................35
4.1.2.1 Operating a hydraulic access fitting system ...................................35
4.1.2.2 Operating a mechanical access fitting system................................37
4.1.3 Consumables/spare parts .........................................................................38
4.1.3.1 Operating a hydraulic access fitting system - ref. figures 28, 29 and
30
38
4.1.3.2 Operating a mechanical access fitting system - ref. figure 31.........39
4.1.4 Installation of corrosion probes and hollow plugs ......................................40
4.1.4.1 Installation of Probe with Hollow Plug - Hydraulic system ..............40
4.1.4.2 Installation of Hollow Plug only - Hydraulic system ........................41
4.1.4.3 Installation of Probe with Hollow Plug - Mechanical system ...........42
4.1.4.4 Installation of Hollow Plug only - Mechanical system .....................44
4.1.5 Inspection .................................................................................................45
4.1.5.1 Hydraulic system ...........................................................................45
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
Document No.: F200-16959-I-MU-0113
5.3
5.4
Chapter 6
6.1
6.2
Chapter 7
7.1
7.2
Chapter 8
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4.1.5.2 Mechanical system ........................................................................45
Testing......................................................................................................46
Commissioning .........................................................................................46
4.1.7.1 Hydraulic system ...........................................................................46
4.1.7.2 Mechanical system ........................................................................47
Plugs 47
OPERATING INSTRUCTIONS.............................................................................48
Replacement of equipment in Pressurised Systems .............................................48
Operation during normal service...........................................................................48
5.2.1 Disturbance of Operation and Corrective Actions......................................48
5.2.1.1 Hydraulic system ...........................................................................49
5.2.1.2 Mechanical system ........................................................................50
Reporting..............................................................................................................51
5.3.1 Hazards and Protective Measures ............................................................51
5.3.1.1 Hazards caused by misuse / use outside specified limits ...............51
5.3.1.2 Hazards caused by external / internal factors ................................51
5.3.2 Operational hazards .................................................................................52
Qualification Requirements and Training Program for Operators..........................53
5.4.1 Operator qualifications..............................................................................53
5.4.2 CASA training program .............................................................................53
MAINTENANCE ...................................................................................................54
General ................................................................................................................54
6.1.1 Introduction...............................................................................................54
Maintenance instructions......................................................................................54
6.2.1 Routine inspection ....................................................................................54
6.2.1.1 Probes ...........................................................................................54
6.2.1.2 Plugs .............................................................................................54
6.2.2 Periodic maintenance ...............................................................................55
6.2.2.1 Probes ...........................................................................................55
6.2.2.2 Plugs .............................................................................................55
6.2.3 Corrections and minor repairs...................................................................56
6.2.3.1 Probes ...........................................................................................56
6.2.3.2 Plugs .............................................................................................56
6.2.4 Storing, preservation and maintenance of preservation ............................56
6.2.4.1 Packing, preservation and storage.................................................56
6.2.4.2 Storing removed equipment...........................................................57
6.2.4.3 Maintenance during storage ..........................................................57
SPARE PARTS LIST ...........................................................................................59
Probes..................................................................................................................60
7.1.1 Probes with hydraulic hollow plug .............................................................60
7.1.2 Probes with mechanical hollow plug .........................................................62
Plugs 64
7.2.1 Hydraulic hollow plugs ..............................................................................64
7.2.2 Mechanical hollow plugs ...........................................................................65
REFERENCE FIGURES TABLE..........................................................................66
4.1.6
4.1.7
4.2
Chapter 5
5.1
5.2
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CHAPTER 1 INTRODUCTION
INTRODUCTION is a description of the CorrOcean ASA User Manual for the above mentioned
products which describes how the manual is structured and how it shall be used. This section
also contains contact information to the user for assistance.
This User manual covers the following corrosion monitoring equipment:
· Probes (corrosion probes for topside installation - fig.1)
· Hollow plugs (in connection with probes or separately installed - fig. 2)
Figure 1, Corrosion probes
Figure 2, Hollow plugs
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1.1 How to use this manual
This user manual contains eight sections:
1
INTRODUCTION
2
MAIN DATA
3
TECHNICAL DESCRIPTION
4
PREPARATION AND INSTALLATION
5
OPERATING INSTRUCTIONS
6
MAINTENANCE
7
SPARE PARTS LIST
8
REFERENCED FIGURES TABLE
NOTE!
Each section contains detailed descriptions made to separately fulfil the needs for different
personnel and interests.
INTRODUCTION is a description of the CorrOcean ASA User Manual for the above mentioned
products, which describes how the manual is structured and how it shall be used. This section
also contains contact information to the user for assistance.
MAIN DATA such as weight, outline dimensions, including restrictions and information about
how to order are covered herein.
TECHNICAL DESCRIPTION gives more specific descriptions of the different items of the
various products. This section is the “textbook” of the manual, where the different measuring
techniques are fully described, together with recommendations for use of the different types of
equipment.
PREPARATION AND INSTALLATION describes all necessary preparations to be carried out
before installation of the different parts of this equipment, including checklists and observations.
This section also contain - if applicable - a complete installation procedure for the actual
equipment
OPERATING INSTRUCTION contain checklists, precautions, consequences, hazards,
observations, operator qualifications and reporting during operational conditions.
NOTE!
This manual does not cover monitoring of the different types of probes. This is covered in
separate manuals depending on type of logging equipment to be used.
MAINTENANCE describes all necessary precautions and maintenance operations which
normally can be done by the user, including those which are recommended to be carried out by
CorrOcean, in order to ensure safe, reliable and economical operation. This section contains
detailed procedures for routine inspection, periodic maintenance, corrections and minor repair
with recommended spare parts, consumables, reporting requirements, relevant document
references and, if applicable, requirements for special skills and minimum crew.
SPARE PARTS LIST gives all necessary spare parts for the different equipment during
operation.
REFERENCE TABLE contains a list of all referenced information and figures used in the
manual.
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1.2 Normative references
This document has been issued in compliance with the most common international standards
for user manual documentation, including the NORSOK standards commonly used in the North
Sea.
The NORSOK standards commonly used in the North Sea are jointly developed by The
Norwegian Oil Industry Association (OLF) and the Federation of Norwegian Engineering
Industries (TBL) and administrated by the Norwegian Technology Standards Institution (NTS).
1.3 Conformity to the Pressure Equipment Directive
(PED)
To ensure safety aspects in connection with the actual equipment and conformity to
requirements in the Pressure Equipment Directive (PED), a risk assessment study has been
carried out to uncover potential hazards.
Based on the risk assessment study this user manual contains warnings wherever a potential
hazard may occur directly or by implication. The warnings are given in this way:
WARNING !
Followed by the actual warning description.
NOTE!
This user manual covers installation in non-pressurised systems only.
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1.4 Assistance
CorrOcean is an international group of companies with a worldwide product distribution. We are
one of the major suppliers of corrosion monitoring technology. In case of repair, service or
further assistance, please contact the authorised CorrOcean service centre in your area. For
information – see our Website at
www.corrocean.com
CorrOcean ASA
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CHAPTER 2 MAIN DATA
MAIN DATA gives equipment information regarding any restrictions in guarantee and use.
Weight, outline dimensions including information about how to order the different equipment,
based on typical data sheets are covered herein.
2.1 Guarantee restrictions
Visually inspect all components for shipping damage. If shipping damage is found, notify carrier
at once. Shipping damage is not covered by the warranty. The carrier is responsible for all
repair and replacement costs resulting from shipment damage.
WARNING!
Read and follow all instructions, warnings and cautions to avoid personal injury or
property damage during system operation. CorrOcean is not responsible for damage or
injury resulting from unsafe use of product, lack of maintenance, incorrect installation
of equipment and/or system operation. Contact CorrOcean when in doubt about any
applications and safety precautions described herein.
CorrOcean ASA
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2.2 Equipment Data - Probes
Probes is a collective term for equipment used to provide information relating process changes
to their effect on metal loss from corrosion and/or erosion.
There are different types of probes with different measuring techniques.
Probes based on the Electrical Resistance technique (ER technique):
· Standard ER-probes (fig. 3, 4, 5, 6)
· The High Sensitive ER-probe (fig. 7)
Probes based on electrochemical techniques:
· LPR-probes (fig. 8, 9, 10, 11)
· Galvanic probes (fig. 12, 13)
Depending on type, probes are available in both projecting and flush mounted designs.
All probes are fitted to a stainless steel plug. The measuring element are preferably moulded
into the probe face.
Performance data:
· All corrosion probes can be used with CorrOcean’s hydraulic access and retrieval system
and with any standard mechanical 2” system. The 2” system term describes the approximate
outer diameter of a mechanical access fitting.
· The following data appear for all types of corrosion probes:
Pressure rating
Pressure test
420 bar at 93 deg. C
420 bar at 93 deg. C
(6092 psi at 200 deg. F)
(6092 psi at 200 deg. F)
NOTE !
For temperatures above 93 deg. C and/or pressure above 420 bar, please consult CorrOcean.
CorrOcean ASA
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Standard ER-probes
ER probes measure corrosion rate as an increase in electrical resistance over time for a steel
element in the probe face. This increase in electrical resistance is proportional to the
accumulated corrosion for the period exposed.
Applications
ER-probes may be used in all relevant environments, such as oil, water and gas.
Restrictions in use
An ER-probe does not measure the instantaneous corrosion rate, but the accumulated
corrosion for a period exposed.
NOTE!
Some types of ER-probes are not recommended when H2S is present. Please contact
CorrOcean for advise.
How to order
Before ordering - please specify all required information on our Order Details Form 001.
CorrOcean will then calculate the correct length of the probe according to the given information.
The L- or A figure at the end of the Part Number is then replaced by the calculated length of the
probe.
CorrOcean ASA
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ER probe Type Repro A
The spiral design of the ER probe type Repro A (fig. 3) allows thick sensing elements and still
acceptable sensitivity. This gives the ER probe type Repro A a considerably longer lifetime than
usual for ER probes. The probe is therefore recommended for use where high corrosion rates
are expected. It can be delivered with three different sensing elements; 1.0mm, 2.0mm and
4.0mm deep, depending on required sensitivity and lifetime.
Sensing element
Figure 3, Repro A probe
Repro A
probe length
Element
thickness
Fixed
1.0 mm
2.0 mm
4.0 mm
1.0 mm
2.0 mm
4.0 mm
Adjustable
Element
width
0.5 mm
Probe
diameter
Probe body
material
Element
material
Part
Number
32 mm
AISI 316L
ST 52-3N
13000-L
13002-L
13001-L
13041-A
13042-A
13043-A
Probe packing is included and mounted on the probe.
Materials
Other types of material can be delivered upon request.
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ER probe Type Repro B
The strip design of the ER probe type Repro B (fig. 4) gives high probe sensitivity. However, the
probe’s lifetime will be shorter than for the ER probe type Repro A. The probe is therefore
recommended for use where corrosion rates are not expected to be very high.
Sensing element
Figure 4, Repro B probe
Repro B
probe length
Element
thickness
Fixed
0.25 mm
0.5 mm
0.25 mm
0.5 mm
Adjustable
Element
width
3.0 mm
Probe
diameter
Probe body
material
Element
material
Part
Number
32 mm
AISI 316L
ST 52-3N
13047-L
13046-L
13049-A
13048-A
Probe packing is included and mounted on the probe.
Materials
Other types of material can be delivered upon request.
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ER probe Type Repro C
The “helix” probe design of the ER probe type Repro C (fig. 5) gives an excellent combination of
long life and sensitivity. The probe is furthermore very rugged, and is therefore recommended
for use even under more extreme conditions.
Sensing element
Figure 5, Repro C probe
Repro B
probe length
Element
thickness
Fixed
0.5 mm
1.0 mm
Element
width
4.5 mm
3.0 mm
Probe
diameter
Probe body
material
Element
material
Part
Number
32 mm
AISI 316L
ST 52-3N
13011-L
13010-L
Probe packing is included and mounted on the probe.
Materials
Other types of material can be delivered upon request.
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ER probe Type Tubular
The tubular probe design (fig. 6) provides very good sensitivity combined with good temperature
stability, since the probe’s reference element is located within the tubular element.
Protective shield
Sensing element
Figure 6, Tubular probe
Tubular fixed
probe length
Element
thickness
Element
length
Probe
diameter
Probe body
material
Element
material
Part
Number
T10
T20
0.25 mm
0.51 mm
55 mm
75 mm
29 mm
ST 52-3N
ST 52-3N
13073-L
13100-L
Probe packing is included and mounted on the probe.
Materials
Standard probe body and sensors element material is ST 52-3N (carbon steel). Same material
is used in both probe body and element to avoid galvanic effects.
Protective shield for measuring element
Protective shields are available and will always be supplied in the same material as the probe in
order to avoid galvanic effects:
Description
Protective shield for T10
Protective shield for T20
Material
ST 52-3N
Part Number
13082
13088
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The High Sensitivity ER-probe
The High Sensitivity ER probe (fig. 7) combines improved probe design and state of the art
instrument features.
Offering an accuracy of +/- 0.025 micrometers, the High Sensitivity ER probe is ideal for testing
and monitoring corrosion inhibitors, providing accurate and rapid information about inhibitor
performance.
Sensing
element
Figure 7, The High Sensitive ER-probe
HSER probe
length
Element
thickness
Element
width
Probe
diameter
Probe body
material
Element
material
Part
Number
Fixed:
Adjustable:
0.1 mm
4.0 mm
32 mm
AISI 316L
ST 52-3N
13122-L
13122-A
Probe packing is included and mounted on the probe.
Materials
Other types of material can be delivered upon request.
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LPR-probes
By use of LPR probes corrosion rates are determined electrochemically (by Stern-Geary’s
equations) from the measured polarisation resistance. LPR probes may also be used with other
electrochemical techniques, like AC impedance and electrochemical noise measurements.
Applications
LPR probes require a conducting electrolyte. LPR probes are therefore recommended for water
systems. LPR probes are designed for long life and corrosion rates are measured
instantaneously. LPR probes are furthermore a good alternative where rapid detection of
changes in corrosion rates is required.
Restrictions in use
· Since the LPR-probe uses an electrochemical technique, it requires sufficient conductivity in
the electrolyte to give reliable measurements. The LPR-probe should therefore be limited to
use in water systems or systems with a high water content.
· This probe should also be avoided for systems with rapid fluctuations in water conditions;
slugs, two-phase flow etc., since the readings can be difficult to interpret and misleading
information can be the result.
· LPR probes will not reflect metal loss caused by erosion.
· Amount and quality of coatings and corrosion products on the measuring elements will affect
the readings. Hence it is important that a regular schedule for inspection and maintenance of
a LPR probe is established.
How to order
Before ordering - please specify all required information on our Order Details Form 001.
CorrOcean will then calculate the correct length of the probe according to the given information.
The L- or A figure at the end of the Part Number is then replaced by the calculated length of the
probe.
CorrOcean ASA
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LPR probe Type Triple B
The LPR probe type Triple B (fig. 8) is designed for three electrode LPR readings. The LPR
probe type Triple B has a flat face consisting of three elements; working, counter and reference.
LPR probes require a conducting electrolyte. LPR probes are therefore recommended for water
systems. LPR probes are designed for long life and corrosion rates are measured
instantaneously.
Three electrode LPR probes can also be used for electrochemical experiments, such as full
polarisation or cyclical polarisation tests.
Working element
Reference element
Counter element
Figure 8, Triple B probe
LPR Triple B probe length
Fixed:
Adjustable:
Probe
diameter
Probe body
material
Element
material
32 mm
AISI 316L
ST 52-3N
Probe packing is included and mounted on the probe.
Electrode areas
Working : 300 mm2
Counter
: 120 mm2
Reference : 120 mm2
Materials
Other types of probe body material can be delivered upon request.
Part
Number
13021-L
13045-A
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LPR probe Type Two electrode B
The LPR probe type Two electrode B (fig. 9) is designed for two electrode LPR readings. The
LPR probe type Two electrode B has a flat face consisting of two elements; working and
counter.
LPR probes require a conducting electrolyte. LPR probes are therefore recommended for water
systems. LPR probes are designed for long life and corrosion rates are measured
instantaneously.
Working element
Counter element
Figure 9, Two electrode B probe
LPR Two electrode B
length
Fixed:
Probe
diameter
Probe body
material
Element
material
Part
Number
32 mm
AISI 316L
ST 52-3N
13025-L
Probe packing is included and mounted on the probe.
Electrode areas
Working : 300 mm2
Counter
: 300 mm2
Materials
Other types of probe body material can be delivered upon request.
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LPR probe Type Two electrode C
The LPR probe type Two electrode C (fig. 10) is designed for two electrode LPR readings. The
LPR probe type Two electrode C has two projecting elements; working and counter. The
projecting design may be beneficial in order to avoid deposits on the electrodes, which
otherwise might reduce the reliability of the LPR measurements.
LPR probes require a conducting electrolyte. LPR probes are therefore recommended for water
systems. LPR probes are designed for long life and corrosion rates are measured
instantaneously.
Working element
Counter element
Figure 10, Two electrode C probe
LPR Two electrode
C length:
Probe
diameter
Projecting
length
Probe body
material
Element
material
Part
Number
Fixed:
32 mm
10.5 mm
AISI 316L
ST 52-3N
13022-L
ST 52-3N
13028
Spare part
Electrode/insulator, set of 2 pcs
Probe packing is included and mounted on the probe.
Electrode areas
Working : 300 mm2
Counter
: 300 mm2
Materials
Other types of probe body material can be delivered upon request.
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LPR probe Type Triple C
The LPR probe type Triple C (fig. 11) is designed for three electrode LPR readings. The LPR
probe type Triple C has three projecting elements; working, counter and reference. The
projecting design may be beneficial in order to avoid deposits on the electrodes, which
otherwise might reduce the reliability of the LPR measurements.
LPR probes require a conducting electrolyte. LPR probes are therefore recommended for water
systems. LPR probes are designed for long life and corrosion rates are measured
instantaneously.
Three electrode LPR probes can also be used for electrochemical experiments, such as full
polarisation or cyclical polarisation tests.
Working element
Counter element
Reference element
Figure 11, Triple C probe
LPR Triple C
length
Fixed:
Probe
diameter
Projecting
length
Probe
body
material
Element
material
Part
Number
32 mm
10.5 mm
AISI 316L
ST 52-3N
13023-L
ST 52-3N
13027
Spare parts:
Electrode/insulator, set of 3 pcs
Probe packing is included and mounted on the probe.
Electrode areas
Working : 300 mm2
Counter
: 300 mm
2
Reference : 300 mm2
Materials
Other types of probe body material can be delivered upon request.
CorrOcean ASA
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Galvanic probes
Galvanic probes are used in water injection systems to monitor the corrosivity caused by traces
of oxygen. This is achieved by monitoring the galvanic current in the circuit between a steel and
a brass electrode, which is particularly sensitive to the amount of oxygen in the water.
Applications
Although the galvanic current within certain restrictions is proportional to the oxygen
concentration in a system, it may not replace an oxygen sensor. Other parameters affecting the
galvanic current are temperature, product flow rate and not least the amount and quality of
coatings and corrosion products forming on the electrode surfaces. This also explains why
galvanic currents may be relatively high initially after installation of a probe when the electrodes
are clean. Gradually, as deposits build up on electrodes the galvanic current drops off until a
steady state is achieved. If calibrations of the probe readings versus oxygen concentrations are
attempted, this should be done after such steady state conditions have been obtained.
Restrictions in use
· Although the galvanic current within certain restrictions is proportional to the oxygen
concentration in a system, it may not replace an oxygen sensor. Hence the galvanic probe is
recommended for early rapid detection of changes in oxygen content, rather than
quantification of the oxygen level.
· Amount and quality of coatings and corrosion products on the measuring elements will affect
the readings. Hence it is important that a regular schedule for inspection and maintenance of
a Galvanic probe is established.
How to order
Before ordering - please specify all required information on our Order Details Form 001.
CorrOcean will then calculate the correct length of the probe according to this given information.
The L- or A figure at the end of the Part Number is then replaced by the calculated length of the
probe.
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
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Galvanic probe Type Galvopro B
The Galvanic probe type Galvopro B (fig. 12) has a flat face consisting of two elements; one
carbon steel element and one brass element.
Galvanic probes are recommended for water injection systems to monitor traces of oxygen
which can influence the corrosivity level.
Steel electrode
Brass electrode
Figure 12, Galvopro B probe
Galvopro B length
Probe
diameter
Probe body
material
Fixed:
32 mm
AISI 316L
Element
material
Part
Number
ST 52-3N / Brass
13031-L
Adjustable:
13059-A
Probe packing is included and mounted on the probe.
Electrode areas
ST 52-3N element : 300 mm2
Brass element
: 300 mm2
Materials
Other materials for the probe body can be delivered upon request.
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Galvanic probe Type Galvopro C
The Galvanic probe type Galvopro C (fig. 13) has two projecting elements; one carbon steel
element and one brass element. The projecting design may be beneficial in order to avoid
deposits on the electrodes, which otherwise might reduce the reliability of Galvanic
measurements.
Galvanic probes are recommended for water injection systems to monitor the corrosivity caused
by oxygen traces.
Steel electrode
Brass electrode
Figure 13, Galvopro C probe
Galvopro
C length
Probe
diameter
Projecting
length
Probe body
material
Fixed:
32 mm
10.5 mm
AISI 316L
Element
material
Part
Number
ST 52-3N /
Brass
13032-L
ST 52-3N /
Brass
13035
Spare parts:
Electrodes/insulators, set of 2 pcs
Probe packing is included and mounted on the probe.
Electrode areas
ST 52-3N element : 565 mm2
Brass element
: 565 mm
2
Materials
Other materials for the probe body can be delivered upon request.
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2.3 Equipment data - Plugs
Plugs is a collective term for equipment used to mount different types of monitoring equipment
into a line or vessel trough access fittings. Plugs are manufactured from stainless steel bar.
There are two main different types of plugs:
· Hollow plugs (used in connection with probes only)
· Solid plugs (used in connection with coupons and injection equipment or separately for
blind off, pressure testing and flushing of pipe)
The hollow and solid plugs carry the pressure seal in the access fitting, and are also the
retrievable carrier for the monitoring device.
Both solid-and hollow plugs are available in two different designs:
· The 2” hydraulic system design (fig. 14)
· The 2” mechanical system design (fig. 15)
Plugs with hydraulic design are used in connection with standard hydraulic access fittings and
when a mechanical access fitting is rebuilt to hydraulic system using a hydraulic adapter.
Please observe that the same plug can not be used with the standard hydraulic access fitting
and hydraulic access fitting adapter.
Plugs with mechanical design are used in connection with mechanical access fittings.
The standard plug seal is made in PTFE (25% glass filled).
NOTE!
Metal seals are available for high temperature service.
Figure 14: Hydraulic hollow plug
Figure 15, Mechanical hollow plug
NOTE!
This manual only covers hollow plugs in connection with probes or separate installation.
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Hollow plugs
The hollow plug assembly is a retrievable carrier for monitoring with different probe types.
The following assembly drawings show the different types installed in access fittings with
corrosion probe:
Hollow plug
Hydraulic access fitting
Figure 16, Hydraulic hollow plug
The hydraulic hollow plug for adapter compensates forthe difference in length when a
position is rebuilt with a hydraulic adapter. Thus, the old monitoringequipment probe or
coupon holder, can still be used.
Hollow plug
Hydraulic adapter
Mechanical access fitting
Figure 17, Hydraulic hollow plug for
adapter
Hollow plug
Mechanical access fitting
Figure 18, Mechanical hollow plug
The hydraulic type is of a unique design with no external threads. The design eliminates galling,
which may be a problem with traditional mechanical plug types.
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Description
Hydraulic hollow plug assembly (fig. 16)
Hydraulic adapter hollow plug assembly (fig. 17)
Mechanical hollow plug assembly, PTFE coated
threads (fig. 18)
Rev:
Page:
Date:
Material
Weight
Part
Number
AISI 316L
Duplex
6 Mo
AISI 316L
Duplex
6 Mo
AISI 316L
1 kg
1 kg
1 kg
1.3 kg
1.3 kg
1.3 kg
0.8 kg
12550
12552
12554
12570
12574
12572
11550
Duplex
6 Mo
0.8 kg
0.8 kg
11555
11559
Materials
Other materials are available upon request.
Restrictions in use
Hollow plugs can only be used in connection with probes (or installed separately).
How to order
Please state:
· Description
· Material quality
· Part Number
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CHAPTER 3 TECHNICAL DESCRIPTION
This section gives a more specific description of the different items of the various products and
is the “textbook” of the manual; different measuring techniques are fully described, together with
recommendations for use of the different types of equipment.
3.1 General information
Based on general corrosion monitoring philosophy, an internal corrosion monitoring system
shall detect the general corrosivity in the system and give a measure of the corrosion metal loss
and corrosion rates in the system. If the rates exceed a specified limit, further inspection and
corrective actions should be carried out.
The corrosion monitoring system shall give early warnings for changes in corrosivity in the
system, e.g. due to changed inhibitor efficiency or increased water content.
The general philosophy is that corrosion monitoring should be applied for carbon steel piping
where corrosion is a possible problem.
Normally each monitored position is equipped with a pair of sensors; e.g. one ER-probe and
one weight loss coupon, for independent monitoring and comparison.
LPR-probes are frequently used in water systems for monitoring of rapid changes in corrosivity.
Galvanic probes are recommended for control of efficiency of the de aeration in the water
injection system, and to monitor oxygen leakage into the system.
Additional
Injection- and sample equipment is used to inject inhibitor chemicals directly into the process
flow and take samples of the process medium.
NOTE!
This manual only covers monitoring with corrosion probes.
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3.2 Probes
Probes is a collective term for equipment used to provide information relating process changes
to their effect on metal loss from corrosion and/or erosion.
There are different types of probes with different measuring techniques.
Probes based on the electrical resistance technique:
· Standard ER-probes
· The High Sensitive ER-probe
Probes based on electrochemical techniques:
· LPR-probes
· Galvanic probes
Probes are available in both projecting and flush mounted types.
Probes are fitted to a stainless steel plug. The measuring elements are preferably moulded into
the probe face.
Figure 19, Corrosion probes
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ER-probes
Measuring principle
ER-probes (Electrical Resistance probes) measure the
corrosion rate as an increase in electrical resistance over
time for an exposed steel element in the probe face. The
measurement element may be a strip, tube or wire. The
ER-probe also has a reference element that is not
exposed to the environment. The ER measurement is the
relative change in resistance for the measurement
element compared to the resistance of the reference
element. ER readings increase over the whole exposure
time of the element until the circuit is broken. The
resistance of the element is measured, and is usually
plotted on a graph. A simple formula converts a pair of
readings over a time interval to a corrosion rate. Probes
can be left installed indefinitely to measure extremely low
corrosion rates, and readings are not affected in the same
way as LPR probes by deposit build-up on the material
surface.
Design and sensitivity
ER-probes are available in numerous designs, both
projecting designs and flush mount designs. Strip
elements can be mounted flush with the pipe surface,
simulating flow conditions across the pipe surface and
conditions of deposit formation in the system. The probe’s
sensitivity depends mainly on the measurement element
thickness. Probes are available with measurement
element thickness from 0.1 mm up to 6 mm. The probe
selection will therefore be a compromise between
required sensitivity and probe life. High Sensitive (thin
element) probes will be selected for inhibitor testing and
where the corrosion rates are expected to be low.
Figure 20: ER-probes
ER readings and temperature
Electrical resistance changes with temperature and electrical resistance probes generally
includes a temperature compensation system, but this can be affected by rapid temperature
changes when highly misleading results may be obtained - such as negative corrosion rates.
Fouling and cleaning of ER-probes
Due to fouling, ER probes should be removed from the system at regular intervals, checked for
fouling, cleaned and reinstalled. The results will be much improved if this is done. A 4-month
interval between services should be satisfactory.
Frequency of ER readings
ER monitoring by use of standard ER-probes is not generally sensitive enough to justify more
than weekly readings and in rare cases twice weekly. There is no instantaneous response, but
there are definite advantages in taking readings as often as probe sensitivity allows. A good
frequency for ER readings is weekly. The High Sensitivity ER-probe has a high sensitivity, and
readings with hourly intervals can be useful for test situations, e.g. inhibitor tests.
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Applications
· Due to the measuring technique, an ER-probe may be used in all relevant environments,
such as oil, water and gas.
· ER monitoring can produce results even when the element is only partially exposed to the
water phase, so this type of probe is particularly recommended for use in oily water systems.
· The High Sensitive ER-probe is particularly recommended for inhibitor testing.
Restrictions in use
· ER probes do not measure instantaneous corrosion rates, but corrosion rates based on
comparison of different readings over time.
· Thin element probes shall not be used in systems where corrosion rates are expected to be
high.
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LPR probes
Measuring principle
An LPR-probe (Linear Polarisation Resistance probe)
consists of 2 or 3 exposed electrodes in steel quality equal
or similar to that of the pipe wall. The LPR technique is
based on electrochemical principles and measures the
electrical current response for a small polarisation of the
probe’s working electrode potential. When the polarisation
voltage and current is known, the polarisation resistance
can be calculated directly in the instrument. The corrosion
rate is inverted proportional to the polarisation resistance.
The measurement gives the instantaneous corrosion rate
directly.
Design
LPR-probes are available with projecting electrodes or
flush mount electrodes in various designs.
Capabilities
LPR, if its full capability is exploited, can give information
on the timing of changes in corrosion rate, the effect of
intermittent changes in oxygen concentration, the build-up
and decay of inhibitor films, and the effect of deposit buildup on localised corrosion, while also providing a corrosion
rate reading in a conductive medium at a point in time.
More advanced potentiostatic equipment can provide
mechanistic information on inhibitor behaviour using the
same probe. AC Impedance monitoring is also possible by
use of LPR probes.
Figure 21: LPR-probes
Use and maintenance of LPR probes in the field
LPR electrode surfaces are best activated prior to installation. New electrodes should be first
rinsed in a hydrocarbon solvent to remove any grease or vapour phase inhibitor. The electrodes
are the fitted to the probe body (if replaceable), and immersed in dilute HCl until bubbles appear
on the electrode surface.
The electrodes are then carefully rinsed, avoiding contact with the hands, then installed in the
system. This procedure, described as “activation” ensures that the electrode surface is clean
and freely corroding when installed.
At each point, following installation of freshly cleaned and activated electrodes, readings should
be taken 3 - 4 times daily for the first 3 - 4 days, and the readings plotted. High readings will be
obtained for a short period after installation, but if conditions in the system are steady, the probe
should start to produce steady readings after 1 - 3 days, at which time the probe is reading the
true corrosion rate at the monitoring point. In an inhibited system with a relatively low corrosion
rate (less than 0.05 mm/yr.), the results are likely to agree closely with coupon data for the next
4 - 6 weeks of exposure of the LPR probe.
The readings tend to diverge from coupon data progressively, due to the insulating or
conductive effects of deposit build-up, variations in rest potential between the electrodes (which
also tends to increase with time) and because the response to pitting is different from that of
coupons.
These progressive effects may give rise to slow response, corrosion rates which rise off the
scale, erratic and unsteady readings and wider variance between Cathodic and Anodic
readings. These effects are often observed in offshore fields where retrieval service is carried
out at less frequent intervals, and can be reduced or eliminated by the introduction of a regular
schedule for inspection and maintenance of LPR probe electrodes. The effects can be seen
more rapidly in systems with high corrosion rates, or where thick deposits tend to form on the
coupons in short periods of time. The divergence from coupon rates is usually greater at higher
corrosion rates, above 0.125 mm/yr.
In systems or locations where the electrodes are not continuously exposed to conductive water
phase, areas of pipework exposed to free water are likely to corrode faster than the LPR
electrodes indicate. It is most important to install the electrodes in free water, under these
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conditions. If this is not possible in the flowing stream, a trap should be considered. Once filmed
with oil, the electrodes often do not return to a 100% water wet condition until removed for
cleaning. In tank or vessel water drain lines particularly, readings less than 0.0075 mm/yr. may
be obtained in oily water, while the true corrosion rate as measured in oil free water may be
over 10 times higher.
Frequency, timing and value of LPR readings
Each LPR reading is a unique data point and has involved a complete polarisation experiment.
They are not points on a curve, like the weight loss of a coupon or the resistance of an ER
probe. However frequent the readings, it is possible for them to miss a moment of high
corrosivity in between, such as a momentary increase in oxygen concentration. Fortunately,
there is a dampening effect, and the corrosion rate measured takes a finite time to change when
system conditions change. Following a major, general reduction in oxygen level, it can take 2-4
hours for the corrosion rate to stabilise, while sudden small increases in oxygen at lower
corrosion rates can produce an almost instantaneous response.
Continuous LPR monitoring is not in fact continuous, but a series of separate readings taken
automatically at constant intervals, and plotted as single points on a continuous chart. To
simplify this process, in most cases only one of the Cathodic / Anodic readings is taken. Since
manual readings can take into account the rate of response (indicating type of deposits), the
difference between Cathodic and Anodic readings and Offset readings (indicating difference in
rest potential between the electrodes), manual readings provide more diagnostic data than
continuous readings.
The advantage of continuous readings is complete coverage of time periods identifying the
exact time and severity of upsets, and giving an indication of the average corrosion rate.
Continuous readings can be made to operate an alarm, and can be used to rapidly monitor the
effect of changes in treatment dosages. However, probes used for continuous monitoring
require service as frequently as probes read manually, i.e. monthly.
Experience with LPR monitoring in the field has shown that upsets tend to take place during the
day, when changes in operating conditions may take place. At night, conditions tend to be
steadier and corrosion rates are likely to be lower. LPR readings taken only in the daytime can
in some cases give a higher average than readings taken only at night. It is recommended that
some night-time readings be included for comparison, and the time should always be recorded
with the reading.
LPR-probes and correlations with other methods
Correlation with other methods, such as weight loss coupons seems to be best with corrosion
rates below 0.05 mm/yr. which are under inhibitor control. However, much valuable diagnostic
information on film characteristics and the localisation of attack can be obtained by an
experienced or well trained operator. The presence of oxygen or bacterial activity can effect
readings in a predictable manner, so the useful information available from an LPR type
measurement is not limited to the corrosion rate.
Close agreement with coupon data is more important in inhibited systems at low corrosion
rates, so even when the corrosion rate is low it is recommended to remove electrodes at regular
intervals for cleaning and reactivation.
Applications
LPR-probes are recommended for water systems only to monitor instantaneous corrosion in the
system.
Restrictions in use
LPR-probes are not to be used for other systems than water systems due to the measuring
technique.
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Galvanic probes
Measuring principle
The galvanic probe consists of two dissimilar metal
electrodes, normally brass and carbon steel. Under
strong oxidising conditions, the corrosion rate tends
to vary with the degree of Anodic polarisation, which
in turn varies with oxygen concentration. The use of
a steel anode with a brass cathode produces a
current flow which relates closely to the oxygen
concentration.
This behaviour is the basis for the use of galvanic
probes to monitor oxygen scavenger treatments.
Figure 22, Galvanic probes
Design
Galvanic probes are available with projecting or flush mount electrodes.
Use of galvanic probes
In oil field production, internal corrosion more commonly takes place under reducing conditions,
with the rate dependent on factors which influence the cathode reaction, such as Cathodic
depolarisation and Cathodic corrosion inhibitors. Galvanic probes using steel as the cathode
and a Zn/Hg/Al electrode as the anode have been used to study the effect of inhibitors on the
cathode reaction in production systems.
With a general corrosion attack taking place on a metal surface, the anode and cathode areas
are roughly equivalent in size, whereas with localised corrosion the Anodic areas are much
smaller than the Cathodic areas, and the Cathodic areas have a much lower current density
than the Anodic areas.
Galvanic probes respond well to variations in the oxidising power of the fluid, related to
changing oxygen and chlorine concentrations. Welds are areas susceptible to galvanic
corrosion, and the effect of improving welding procedures and materials is to reduce the
sensitivity of the weld to such changes. Thus a galvanic probe is probably a good model of a
susceptible weld. Changes which reduce the current monitored by a galvanic probe are very
likely to reduce selective weld corrosion also.
Applications
Galvanic probes are recommended for monitoring the oxygen level in water injection systems,
to monitor the efficiency of oxygen scavengers and to detect possible oxygen leak’s into the
system.
Restrictions in use
· Galvanic probes do not replace an oxygen detector.
· Galvanic probes do not give corrosion rates, but a galvanic current value depending on the
oxygen level in the system.
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3.3 Plugs
Plugs is the collective term for equipment used to
mount different type of equipment into line or
vessels such as probes, coupons in connection
with coupon holders and injection equipment. Plugs
are manufactured from stainless steel bar.
The standard plug seal is made in PTFE (25%
glass filled).
NOTE!
Metal seals are available for high temperature
service.
Figure 23, Hollow plugs
There are two main plug type:
· Hollow plugs
· Solid plugs
Hollow plugs (fig. 23) are used in connection with probes only:
· All types of ER-probes
· LPR-probes
· Galvanic probes
Solid plugs are used in connection with the following equipment:
· Strip- or disc coupon holders in connection with strip- or disc weight loss coupons
· Strip coupon holder in connection with scale coupons
· Bio coupon holder in connection with bio coupons
· Injection equipment
Depending on the type of access fitting, both solid- and hollow plugs are available in a
mechanical type with external threads and a hydraulic type with no external threads.
The hydraulic design with no external threads eliminates galling, which may be a problem with
traditional mechanical plug types. By using a hydraulic adapter it is possible to rebuild traditional
mechanical access fittings to the hydraulic system. By using a long version of the hydraulic
plug, the old monitoring equipment can still be used.
NOTE!
This manual only covers hollow plugs in connection with probes or separate installation.
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CHAPTER 4 PREPARATION AND INSTALLATION
This section describes all necessary preparations to be carried out before installation of the
different parts of this equipment, including checklists and observations. This section also
contain - if applicable - a complete installation procedure for the actual equipment
All preparations and installation guidelines until the equipment is ready for normal operation are
described in this chapter for the following equipment:
· Corrosion probes
· Plugs (in connection with probes or separately installed)
It is possible to install this equipment in two different ways:
· Manually by use of hand tools before system start up or during shut down when the line or
vessel is empty and unpressurised.
· By use of a special retrieval tool during full operational conditions of the system.This method
is covered in the user manual for the hydraulic retriever tool.
NOTE!
Different guidelines are given depending on which hydraulic- or mechanical system is being
operated.
4.1 Probes
4.1.1
Preparation
WARNING !
Installation of a probe as described below requires a depressurised, drained and
ventilated pipe or vessel.
Sufficient working space must be available
4.1.2
Tools/equipment
The following tools and equipment are needed:
4.1.2.1
Operating a hydraulic access fitting system
Ref.pos.
fig. 24 & 25
1
2
3
4
5
6
7
9
10
-
Description
Adjustable spanner
Unbraco key
Unbraco key
Open-end spanner
Open-end spanner
Open-end spanner
Open-end spanner
Cleaning fluid for probe element
(neutral solution; no acidic or
alkaline solution)
Non-sparking hammer (brass or
plastic)
Lubrication grease
Cleaning rags
Size / type
Quantity (pc)
12 “
2,5 mm
10 mm
1” or 26 mm
30 mm
1 ¼” or 32 mm
105 mm
Degreasing
agent
1
1
1
1
1
1
1
-
-
1
Approved type
-
-
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6
4
3
2
5
4
9
Figure 24, Hydraulic access fitting system
Figure 25, Hydraulic hollow plug
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4.1.2.2
Operating a mechanical access fitting system
Ref. pos.
fig. 26 & 27
1
2
3
4
5
6
7
Rev:
Page:
Date:
Description
Unbraco key
Open-end spanner
Open-end spanner
Hook spanner
Adjustable spanner
Non-sparking hammer (brass or plastic)
Cleaning fluid for probe element (neutral
solution; no acidic or alkaline solution)
Lubrication grease
Cleaning rags
Size / type
Quantity
(pc)
2,5 mm
1” or 26 mm
30 mm
60-90 mm
12”
Degreasing agent
1
1
1
1
1
1
-
Approved type
-
-
5
5
4/6
1
1
3
2
2
7
Figure 26, Mechanical hollow plug
Figure 27, Mechanical access fitting system
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Consumables/spare parts
All parts are normally assembled on the access fitting, hollow plug and probe, but the following
spare parts should be available for one probe location:
4.1.3.1
Pos.
1)
Operating a hydraulic access fitting system - ref. figures 28, 29 and 30
Description
Part
number
Quantity
(pc)
1
2 (1)
3
4
Primary packing, PTFE
Probe packing, PTFE
Wear ring, PTFE
Locking pin
1
1
2
4
5
6
O-ring for locking pin, Viton A
Set screw, M5x5, SIS 2342 (A4)
Set screw, M5x5, Duplex
Set screw, M5x5, Titanium
11505
11554
12504
12596
12630 1)
12597
11503
11510
11515
8
1
1
1
Comments
Using hollow plug in AISI 316L
Using hollow plug in Duplex
Using hollow plug in 6Mo
For use with PED 97/23/ ECapproved access fittings.
WARNING!
(1)
Pos. 2 “Probe packing” is not shown on figures 29 and 30. The packing is loaded
inside the hollow plug nut. Ensure that the packing is in place.
2
1
3
4
5
Figure 28: Probe location spare parts
Figure 30, Probe in hydraulic fitting
Figure 29, Probe in hydraulic adapter
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Operating a mechanical access fitting system - ref. figure 31
Pos.
1
2 (1)
3
Rev:
Page:
Date:
Description
Primary packing, PTFE
Probe packing, PTFE
Set screw, M5x5, SIS 2343 (A4)
Set screw, M5x5, Duplex
Set screw, M5x5, 6Mo
Part
number
Quantity
(pc)
11505
11554
11503
11510
11516
1
1
1
1
1
Comments
Using hollow plug in AISI 316L
Using hollow plug in Duplex
Using hollow plug in 6Mo
WARNING!
(1)
Pos. 2 “Probe packing” is not shown on figure 31. The packing is loaded inside the
hollow plug nut. Ensure that the packing is in place.
1
3
Figure 31, Probe in mechanical fitting
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Installation of corrosion probes and hollow plugs
4.1.4.1
Installation of Probe with Hollow Plug - Hydraulic system
WARNING !
Installation of a probe as described below requires a depressurised, drained and
ventilated pipe or vessel.
Probes can only be installed in combination with hollow plugs.
The probe and the hollow plug should be assembled and installed following the procedure
described below, (see also fig. 32).
Note:
Before installation it is important to check that the diameter of the hole through the access
fitting
and the pipe wall is at least 35 mm. If the hole is too small, it will cause problems
during
installation and the probe might be damaged.
Step
Description
1
Check and, if necessary, replace the wear-rings on the hydraulic hollow plug.
2
Loosen set screw 2 on the hollow plug. Remove the sealing plug. (NOTE! left-hand
threads). Remove the probe packing from the sealing plug. (The probe packing might
also be located inside the packing nut).
WARNING!
Check the probe packing, and replace if necessary.
3
Remove the packing nut (loosen set screw 1 first).
WARNING!
Check and, if necessary, replace the primary packing. Then see to it that the
packing is correctly mounted.
4
Mount the packing nut again, and tighten it as much as necessary to hold the primary
packing in a fixed position.
WARNING!
It should not be possible to rotate the primary packing.
5
Check the probe to be installed. If it is preserved with grease or any other protective
compound, this protection must be removed and the probe front must be cleaned with
e.g. acetone.
6
Mount the probe packing on the probe.
7
Screw the probe into the packing nut. Tighten it, and then tighten set screws 1 and 2. The
hollow plug and the probe are now assembled.
8
Remove the heavy protective cover from the hydraulic access fitting with the 105 mm
open spanner.
9
Unscrew the four locking pins. Check the O-rings and replace, if necessary. Also lubricate
the threads.
10
Slide the assembled hollow plug and probe into the access fitting. Then tighten the
locking pins. Mount protective plastic caps on the locking pins.
11
Lubricate external threads on access fitting and the o-ring surface (for service valve).
Then put on the heavy protective cover (cover with hole). Tighten it to make the cover
hold the plug/probe in position. (The locking pins only hold the plug in position during
retrieval operations).
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WARNING !
It is very important not to use excessive force, because this may cause the hydraulic
cover to become loose.
4.1.4.2
Installation of Hollow Plug only - Hydraulic system
WARNING !
Installation of a hollow plug as described below requires a depressurised, drained and
ventilated pipe or vessel.
Pipe plug
Wear ring
(P/N 12504)
Hollow body
plug
Wear ring
(P/N 12504)
Primary packing
(P/N 11505)
Pobe packing
(P/N 11554)
Packing nut
Set screw 1
Set screw 2
Sealing
plug
Probe
Figure 32, Hydraulic hollow plug
WARNING!
If the hollow plug is to be installed without a probe, the sealing plug must be
used instead of the probe to prevent leaks through the internal hole of the
hollow plug.
Installation of the hollow plug may be done by following the procedure described for hollow
plug/probe (step 1 to 11) with the exception of the following:
Step
Description
5
6
Not applicable.
Mount the probe packing on the sealing plug.
WARNING!
Check the probe packing, and replace if necessary.
7
Screw the sealing plug into the packing nut. Tighten it and then tighten set screw 1
and 2.
10
Slide the hollow plug into the access fitting. Then tighten the locking pins. Mount
protective plastic caps on the locking pins.
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WARNING !
It is very important not to use excessive force, because this may cause the
hydraulic cover to become loose.
4.1.4.3
Installation of Probe with Hollow Plug - Mechanical system
Probes can only be installed in combination with hollow plugs. The probe and the hollow plug
should be assembled and installed following the procedure described below, (see also fig. 33).
WARNING!
Before installation, it is important to check that the diameter of the hole through
the access fitting and the pipe wall is at least 35 mm. If the hole is too small, it
will cause problems during installation and the probe might be damaged.
Step
1
Description
Loosen set screw 2 on the hollow plug. Remove the sealing plug. (NOTE! left-hand
threads). Remove the probe packing from the sealing plug. (The probe packing might
also be located inside the packing nut).
WARNING!
Check the probe packing and replace, if necessary.
2
3
Remove the packing nut (loosen set screw 1 first).
WARNING!
Check and, if necessary, replace the primary packing. Then see that the packing
is correctly mounted.
Mount the packing nut again, and tighten it as much as necessary to hold the primary
packing in a fixed position.
WARNING!
It should not be possible to rotate the primary packing.
4
Check the probe to be installed. If it is preserved with grease or any other protective
compound, this protection must be removed and the probe front must be cleaned with, for
example, acetone.
5
Mount the probe packing on the probe. New probes are normally delivered with the probe
packing already mounted.
WARNING!
Check the probe packing, and replace if necessary.
6
Screw the probe into the packing nut. Tighten it, and then tighten set screws 1 and 2. The
hollow plug and the probe are now assembled.:
7
Lubricate threads on hollow plug with a suitable lubricant (like Copaslip)
8
Screw the assembled hollow plug and probe into the access fitting. Tighten it properly
using the 29 mm open spanner (14 - 15 turns).
WARNING!
Ensure that the assembly is properly tightened by counting the turns.
9
Lubricate external threads on access fitting and the o-ring surface (for service valve). Put
on the protective cover (the 60-90 mm hook spanner may be used).
10
Screw the pipe plug into the hexagonal part of the hollow plug and tighten it.
CorrOcean ASA
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Pipe plug
Hollow plug body
Primary packing (P/N
11505)
Probe packing
(P/N 11554)
Set screw 1
Set screw 2
Sealing plug
Probe
Figure 33, Mechanical hollow plug
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Installation of Hollow Plug only - Mechanical system
WARNING!
If the hollow plug is to be installed without a probe, the sealing plug must be
used instead of the probe to prevent leaks through the internal hole in the
hollow plug.
Installation of the hollow plug may be done by following the procedure described for the hollow
plug/probe (step 1 to 10) with the exception of the following:
Step
4
5
6
8
Description
Not applicable.
Mount the probe packing on the sealing plug.
WARNING!
Check the probe packing, and replace if necessary.
Screw the sealing plug into the packing nut. Tighten it, and then tighten set screws 1 and
2.
Screw the hollow plug into the access fitting. Tighten it properly using the 29 mm open
spanner
(14 - 15 turns).
WARNING!
Ensure that the assembly is properly tightened by counting the turns.
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Inspection
4.1.5.1
Hydraulic system
When the probe/hollow plug (or only the hollow plug) is installed, check the following - see
figure 34:
· Protective cover should be tightened properly with the 105 mm open spanner.
· All locking pins are to be tightened slightly until they stop.
WARNING !
It is very important not to use excessive force, because this may cause the hydraulic
cover to become loose.
· Mount protective plastic caps.
· The pipe plug on the top of the hollow plug is to be mounted if the probe is not connected for
online monitoring, to protect the internal threads of the hollow plug.
4.1.5.2
Mechanical system
When the probe/hollow plug (or only the hollow plug) is installed, check the following - see
figure 35:
· The hollow plug should be installed with at least 14 turns - see figure 31:
· The protective cover is to be mounted to protect the threads on the access fitting.
· The pipe plug on the top of the hollow plug should be mounted if the probe is not connected
for online monitoring, to protect the internal threads of the hollow plug.
Pipe plug
Protective
cover
Locking pin
Figure 34, Hydraulic system
Figure 35, Mechanical system
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Testing
If possible - the following should be tested after installation:
Step
4.1.7
Description
1
Take a measurement of the probe and compare with the probe certificate to ensure that
the probe is OK before the system is pressurised.
2
Check that there is no leakage when the system is pressurised.
3
Take a new measurement after the system is pressurised to ensure that the probe is still
OK.
Commissioning
4.1.7.1
Hydraulic system
The following commissioning is to be carried out every time the probe/hollow plug or the hollow
plug only is withdrawn:
Probe with hollow plug
The following packings shall always be changed:
· Primary packing
· Probe packing
The following shall be changed if necessary (due to damages):
· Wear rings
· Set screws
Hollow plug only
The following packings shall always be changed:
· Primary packing
The following shall be changed if necessary (due to damages):
· Wear rings
· Set screws
Wear ring
(P/N 12504)
Wear ring
(P/N 12504)
Probe packing
(P/N 11554)
Probe
Set screws
CorrOcean ASA
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Mechanical system
Probe with hollow plug
The following packings shall always be changed:
· Primary packing
· Probe packing
The following shall be changed if necessary
(e.g. due to damages):
· Set screws
NOTE!
Outer threads on hollow plug shall always be checked, cleaned and lubricated with grease
before reinstalling. If threads are damaged, they shall be repaired if possible, or the plug shall
be changed.
Hollow plug only
The following packings shall always be changed:
· Primary packing
The following shall be changed if necessary (e.g. due to damages):
· Set screws
NOTE!
Outer threads on hollow plug shall always be checked, cleaned and lubricated with grease
before reinstalling. If threads are damaged, they may be repaired if possible, or the plug should
be changed.
Pipe plug
Outer threads
Primary packing
(P/N 11505)
Probe packing
(P/N 11554)
Sealing plug
Set screws
Probe
4.2 Plugs
· Hollow plugs are normally installed in connection with probes.
· Hollow plugs can also be installed separately without probes.
For both possibilities, with all required information regarding preparation before, and guidelines
during installation - see clause 4.1
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CHAPTER 5 OPERATING INSTRUCTIONS
This section contain checklists, precautions, consequences, hazards, observations, operator
qualifications and reporting during operational conditions for the following products:
· Probes
· Plugs
Due to type of equipment, operating instructions in this User Manual are limited to the following:
Equipment
Description
Probes
Instructions in user manual for MultiCorr- and/or MultiLog are to be
followed.
Plugs
Not applicable during operational conditions. Plugs are normally not
operated other than during change and service of equipment in
connection with regular replacement programs.
After installation of probes, they may be operated in two different ways:
· Manually by use of portable instrument for probe measurements.
· Automatically by use of online monitoring system.
5.1 Replacement of equipment in Pressurised Systems
Replacement of corrosion monitoring equipment in pressurised systems is not described in this
manual. See the user manual for the retriever tool.
5.2 Operation during normal service
WARNING!
Dismantling of any part of an access fitting assembly (cover, locking pins, plug or
probe) shall not take place during normal service.
5.2.1
Disturbance of Operation and Corrective Actions
Disturbance of operation and corrective actions regarding monitoring of corrosion probes are
covered by the user manual for MultiLog- and/or MultiCorr instrument.
Hence this user manual only covers the following described disturbance and corrective actions
for the installed equipment during operation.
CorrOcean ASA
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Hydraulic system
See figure 36:
Disturbance of Operation
Corrective Action
Leakage through the primary packing
Tighten the heavy protective cover with a 105
mm open-end spanner to try to stop the leakage
by compressing the primary packing.
Protective cover
Primary packing
Figure 36, Hydraulic system
WARNING !
If the described corrective action does not stop the leakage, the probe/hollow plug must be
withdrawn either manually during shut down, or by a special retrieval tool during operational
conditions - see user manual for the retrieval tool. Both primary packing and probe packing must
be changed, following the reversed steps in clause 4.1.4.1. (Probe packing is not shown on drawing
- the packing is loaded inside the hollow plug nut). Metal primary packing is to be used for
temperatures above 93 degrees C.
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Mechanical system
See figure 37:
Disturbance of Operation
Corrective Action
Leakage through the primary packing
Remove the protective cover. Tighten the hollow
with a 29 mm open-end spanner to try to stop the
leakage by compressing the primary packing.
For 29 mm open spanner
Protective cover
Hollow plug
Primary packing
Figure 37, Mechanical system
WARNING!
If the described corrective action does not stop the leakage, the probe/hollow plug must
be withdrawn either manually during shut down, or by a special retrieval tool during
operational conditions - see user manual for the retrieval tool.Both primary packing and
probe packing must be changed, following the reversed steps in clause 4.1.4.3. (Probe
packing is not shown on drawing - the packing is loaded inside the hollow plug nut).
Metal primary packing is to be used for temperatures above 93 degrees C.
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5.3 Reporting
Reporting should be carried out using the following page.
Independent of type of equipment installed, the following should be reported to the supplier in
the form of registrations and observations:
· Any visible leakage in the installed equipment in the access fitting during operational
conditions.
5.3.1
Hazards and Protective Measures
Hazards that may occur during operation are limited to the following:
· Leakage through the access fitting assembly due to faulty installation of equipment.
· Leakage through the access fitting assembly due to high temperature (above maximum
operational temperature)
Hazards assosiated with leaks:
· Hot liquid/gas
· Toxic liquid/gas
· Radioactive liquid/gas
· Flammable liquid/gas
Operators working on or close to a hydraulic access fitting assembly with a leak must take
necessary precautions with regards to protective equipment and clothing to avoid injuries
caused by the leaking substance. Necessary precautions must also be taken to avoid
fire/explosion if the leaking substance is flammable.
5.3.1.1
Hazards caused by misuse / use outside specified limits
Hazards can occur as a result of changes in operational or environmental conditions, which
might cause the pressure or temperature to exceed the specified pressure and temperature
limitations. Such situations can cause leaks, with the assosiated hazards described above. The
operator must ensure that the operating limits are not exceeded to avoid such hazards.
5.3.1.2
Hazards caused by external / internal factors
External / internal factors can cause leaks with the hazards described above. Such external /
internal factors are e.g.:
· external impact
· internal impact (slugs etc.)
· corrosion (causing change in the access fitting)
· fire / explosion (in close proximity, causing seal failure due to high temperature)
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Operational hazards
A leakage may occur through the access fitting if the probe/hollow plug is not installed
according to procedure, or if the temperature in the location is higher than given in the
specifications (packings may melt). Please report using this page and send it to your nearest
CorrOcean service centre.
Customer:
Installation:
Tag no.:
System:
P.O.No. (when applicable):
Other references:
Description of disturbance
Sketch of other type of access fitting than
shown; e.g. flanged
· Use arrows on the appropriate picture below to show the visible disturbance
Figure 38, Hydraulic fitting
Figure 39, Hydraulic adapter
Figure 40, Mechanical fitting
NOTE!
The figures shown will cover all possible disturbances, independent of access fitting type used,
but any access fitting type other than these should be described in the table with a sketch.
CorrOcean ASA
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5.4 Qualification Requirements and Training Program
for Operators
5.4.1
Operator qualifications
There are two different ways to install equipment covered by this manual:
Method
Description
1
Manually during shut down or non operational conditions with unpressurised and
empty line or vessel
2
By use of a special retriever tool during operational conditions
For method 1, mechanics following instructions strictly in this User Manual can perform the
installation of equipment.
For method 2, only specially trained personnel certified by CorrOcean can perform the
installation of equipment - see information given in clause 5.4.2.
5.4.2
CASA training program
CorrOcean has established a well structured training concept called the CorrOcean Training
Institute (CTI). This concept was primarily meant to cover the internal training needs of all
personnel working for the CorrOcean group of companies, but over time many of the technically
related courses have been adapted to fit clients’ needs as well. Now we are continuously
working to further develop the courses for both internal and external purposes.
The CorrOcean Training Institute is structured into different levels and modules within each
area, which makes it possible to select a desired “package” of courses. A two-week training
period covering most of the technically related courses (at level 2) is held once or twice a year
at CorrOcean’s premises in Trondheim. Otherwise, both standard and client specific courses
may be held at the client’s premises as agreed.
CorrOcean ASA
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CHAPTER 6 MAINTENANCE
This section describes all necessary precautions and maintenance operations which normally
can be done by the user, including those which are recommended to be carried out by
CorrOcean, in order to ensure safe, reliable and economical operation. This section contains
detailed procedures for routine inspection, periodic maintenance, corrections and minor repair
with recommended spare parts, consumables, reporting requirements, relevant document
references and, if applicable, requirements for special skills and minimum crew.
6.1 General
6.1.1
Introduction
Due to type of equipment, no maintenance of the equipment covered by this User Manual is
applicable during normal operational conditions. Only limited routine inspection is applicable.
6.2 Maintenance instructions
6.2.1
Routine inspection
This section of the maintenance instructions consists of the regular inspections carried out by
the operation and/or maintenance personnel. The inspections consist of what can be measured,
seen, heard or felt without interference in the equipment both during an operation and while at
standstill.
6.2.1.1
Probes
The following inspections can be carried out:
· Measurements (by portable or online equipment) to verify the condition of the probe; see
user manual for MultiCorr- and/or MultiLog instrument.
6.2.1.2
Plugs
No inspection during operational conditions is applicable.
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6.2.2 Periodic maintenance
6.2.2.1
Probes
Periodic maintenance on probes shall be carried out at regular intervals. For recommended
maintenance intervals for the different probe types - see clause 3.2.
The following maintenance shall be carried out:
Probe type
Description
ER-probes
Exposed element shall be cleaned by a degreasing solvent like acetone.
(incl. The High
Sensitive ER-probe)
Note!
No mechanical cleaning is to be used (like grid paper)
LPR-probes
Exposed elements shall be cleaned preferably with a solvent (a
degreasing solvent like acetone). Mechanical cleaning (e.g. with fine
graded grit paper) may be used.
For probe with replaceable elements; elements are to be replaced with
new ones.
Galvanic probes
Exposed elements shall be cleaned preferably with a solvent (degreasing
solvent, e.g. acetone). Mechanical cleaning (e.g. with fine graded grit
paper) may be used.
For probe with replaceable elements; elements are to be replaced with
new ones.
6.2.2.2
Plugs
The following periodic maintenance shall be carried out on plugs in connection with
maintenance on probes or change out of coupons:
Plug type
Hydraulic hollow
plugs (incl. hydr.
adapter plugs)
Mechanical hollow
plugs
Description
Primary packing shall always be replaced
Probe packing shall always be replaced
Wear rings shall be replaced if they are
damaged
Threads in connection with the probe shall
be repaired if necessary
Required tool
Threading Die ¾”-16L
Primary packing shall always be replaced
Probe packing shall always be replaced
Outer threads and threads in connection
with the probe shall be repaired if
necessary
Threading Die ¾”-16L
Threading Die 1” ¾-12
UN2A
(for repair of damaged
threads on hollow plug)
(for repair of damaged
threads on hollow plug)
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Corrections and minor repairs
This clause covers - when applicable - information about:
· Replacement of broken parts
· Repairs which can be done on site or in a normally equipped maintenance shop
6.2.3.1
Probes
Generally:
Repairs of probe elements are not applicable.
Probe
Type
Repro A
Repro B
Repro C
HSER *
ER-probes
Tubular
LPR-probes
All types
Galvanic
probes
Description
Required tool
Repair of damaged threads when needed
Threading Die for 1”14 UNS-L threads
Repair of damaged threads when needed
Replacement of protection shield when
needed
Repair of damaged threads when needed
Repair of damaged threads when needed
* HSER = High Sensitive ER probe
6.2.3.2
Plugs
The only repair applicable is repair of damaged threads - see clause 6.2.2.2
6.2.4
Storing, preservation and maintenance of preservation
6.2.4.1
Packing, preservation and storage
Probes
Packing
Probes should be packed separately in cardboard boxes, which are marked with Probe Type,
Part No. and Serial No. The boxes will also be marked with other information (e.g. P.O. No.,
P.O. Item No., Stock No., Tag No.), if this is required by purchaser.
Preservation
For all probes except those with replaceable electrodes, the probe front is to be protected by the
"hot-dip" preservation compound, which will provide protection both against corrosion and
mechanical damages.
For probes with replaceable electrodes (LPR Triple C and Galvopro C), a polyethylene bag with
a silica gel package inside should be taped to the probe front.
When preserved this way, probes can be stored for a period of up to 2 years without any
additional preservation being required, provided the probes are stored as described below.
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Storage
Probes shall be stored indoors in a dry area.
Probes are to be stored in the original cardboard box, and not to be unpacked until just before
installation.
Plugs
Packing
Plugs may be packed separately in cardboard boxes, marked with Type and Part No. The
boxes will also be marked with other information (e.g. P.O. No., P.O. Item No., Stock No., Tag
No.), if this is required by purchaser.
Preservation
Plugs are made in stainless steel and therefore no preservation is required.
Storage
Plugs are to be stored indoors in a dry area.
It is recommended to store plugs in the original packing.
6.2.4.2
Storing removed equipment
Probes
If probes are removed and are to be installed again later, the probe first must be cleaned
carefully.
For all probes, the probe front should then be protected by the "hot-dip" preservation compound,
which will provide protection both against corrosion and mechanical damages. If the “hot-dip”
preservation is not accessible, other kinds of protection; e.g. corrosion inhibited envelope, may be
used to preserve probe elements.
When preserved using the “hot-dip” compound, the probes can be stored for a period of up to 2
years without any additional preservation being required, provided the probes are stored as
described below. Using other kinds of preservation, additional preservation at a later stage is
recommended.
Probes are to be stored indoors in a dry area. If possible, removed probes should be stored in
the original cardboard box.
Plugs
If plugs are removed and are to be installed again later, the plugs must be cleaned carefully.
Plugs are made in stainless steel, and therefore no later preservation is required.
Plugs must be stored indoors in a dry area. If possible, removed plugs should be stored in the
original packing.
6.2.4.3
Maintenance during storage
Probes
If probes are preserved using another method than the “hot-dip” compound, special care must
be taken during the storage period. The probe must be visually inspected at short intervals to
ensure that the elements do not corrode.
Probes must be stored indoors in a dry area.
Probes are to be stored in the original cardboard box, and shall not be unpacked until just before
installation.
Before reinstallation of the probe, the measuring element(s) must be carefully cleaned by a
degreasing solvent; e.g. acetone.
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Note!
· Measuring element on ER-probes shall only be cleaned with a degreasing solvent (not grid
paper or any other mechanical cleaning method).
· LPR- and Galvanic probes with replaceable elements shall be equipped with new elements.
· LPR- and Galvanic probes with non replaceable elements, may be cleaned with a fine grade
grid paper if needed
Plugs
Plugs are made of stainless steel and therefore no special maintenance during storage is
needed, provided the plugs are stored as described below.
Plugs must be stored indoors in a dry area.
No special care is needed before reinstalling.
CorrOcean ASA
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CHAPTER 7 SPARE PARTS LIST
This section gives all necessary spare parts for the different equipment during operation.
All components which may require replacement due to destruction, wear, etc., are noted in a
separate spare parts list for the following type of equipment:
· Probes
· Plugs
The components are identified and described so that the necessary spare parts may be
obtained. All lists are illustrated.
The spare parts list includes
·
·
·
·
reference to figure and position number
description with material statement
the CASA parts number
if applicable - reference to national or international component standards
All recommended spare parts are normally stock equipment.
The list is made in such a way that spare parts intended for installation and commissioning, and
spare parts intended for two (2) years operation, are identified separately.
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7.1 Probes
7.1.1
Probes with hydraulic hollow plug
Ref. Figure 41, Figure 42 and Figure 44(different material for some pos. no’s depend on material in hollow
plug)
Pos.
1
Spare part
Locking pin
Part
No.
Material
Qty. for
Installation /
commissioning
Qty. for two
years
operation
12596
12630
NiCrMo
4
4
8
1
16
8 (1)
1
8 (1)
1
N/A
4
1
4)
2
3
O-ring for locking pin
Probe packing (for all type of
probes)
12597
11554
4
Primary packing
11505
5
6
12504
13082
13088
ST 52-3N
N/A
1
7
Wear ring
Prot. shield for T10 Tubular
probe (only for probe P/N
13073-L)
Prot. shield for T20 Tubular
probe (only for probe P/N
13100-L)
Set screw M5x5
Viton A
PTFE, 25%
glass filled
PTFE, 25%
glass filled
PTFE
ST 52-3N
8
Hollow plug nut
9
Pipe plug
10
11
O-ring (for all type of probes)
Electrode/insulator, set of 2
(only for probe P/N 13022-L)
Electrode/insulator, set of 3
(only for probe P/N 13023-L)
Electrodes/insulators, set of 2
(only for probe P/N 13032-L)
11503
11510
11515
11552
11557
11562
11506
11511
11514
25758
13028
SIS 2343
Duplex
6Mo
AISI 316L
Duplex
6 Mo
AISI 316L
Duplex
6Mo
Viton
ST 52-3N /
PTFE
ST 52-3N /
PTFE
ST 52-N /
Brass / PTFE
1
1
1
N/A
N/A
N/A
N/A
N/A
N/A
1
N/A
2
2
2
1
1
1
1 (2)
1 (2)
1 (2)
1
2 (3)
N/A
2 (3)
N/A
2 (3)
6
12
13
13027
13035
WARNING!
(1)
Depending on interval for service/maintenance of the probe. To be changed every
time probe is withdrawn.
(2)
Only required when probe is monitored by use of portable instrument.
(3)
Depending on interval for service/maintenance of the probe. To be changed every
time probe is withdrawn.
(4)
For use with PED 97/23/EC approved access fittings
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
Document No.: F200-16959-I-MU-0113
Rev:
Page:
Date:
9
5
2
1
5
4
7
7
8
Probe
Figure 41: Hydraulic system with flush probe
10
3
12
11
6
13
Figure 42: Corrosion probes
02
61 of 66
09.12.03
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
Document No.: F200-16959-I-MU-0113
7.1.2
Rev:
Page:
Date:
02
62 of 66
09.12.03
Probes with mechanical hollow plug
Ref. fig. 43 and 44. (different material for some pos. no’s depend on material in hollow plug)
Pos.
Spare part
Part
No.
Material
PTFE, 25%
glass filled
PTFE, 25%
glass filled
8 (1)
1
8 (1)
13082
N/A
1
13088
N/A
1
1
1
1
N/A
N/A
N/A
N/A
N/A
N/A
1
N/A
2
2
2
1
1
1
1 (2)
1 (2)
1 (2)
1
2 (3)
N/A
2 (3)
N/A
2 (3)
Probe packing
11554
2
Primary packing
11505
3
4
Protective shield for T10 Tubular
probe
Protective shield for T20 Tubular
probe
Set screw M5x5
5
Hollow plug nut
6
Pipe plug
7
8
O-ring (for all type of probes)
Electrode/insulator, set of 2
(only for probe P/N 13022-L)
Electrode/insulator, set of 3
(only for probe P/N 13023-L)
Electrodes/insulators, set of 2
(only for probe P/N 13032-L)
10
Qty. for two
years
operation
1
1
9
Qty. for
Installation /
commissioning
11503
11510
11515
11552
11557
11562
11506
11511
11514
25758
13028
13027
13035
SIS 2343
Duplex
6Mo
AISI 316L
Duplex
6 Mo
AISI 316L
Duplex
6Mo
Viton
ST 52-3N /
PTFE
ST 52-3N /
PTFE
ST 52-3N /
Brass / PTFE
WARNING!
Depending on interval for service/maintenance of the probe. To be changed every
time probe is withdrawn.
(1)
(2)
(3)
Only required when probe is monitored by use of portable instrument.
Depending on interval for service/maintenance of the probe. To be changed every
time probe is withdrawn.
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
Document No.: F200-16959-I-MU-0113
Rev:
Page:
Date:
4
4
2
Probe
Figure 43: Mechanical system
10
3
12
11
6
13
Figure 44: Corrosion probes
02
63 of 66
09.12.03
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
Document No.: F200-16959-I-MU-0113
Rev:
Page:
Date:
02
64 of 66
09.12.03
7.2 Plugs
The following spare parts are recommended when a hollow plug is installed without probe:
7.2.1
Hydraulic hollow plugs
Ref. fig 45. (different material for some pos. no’s depend on material in hollow plug)
Pos.
Spare part
Part No.
1
Locking pin
2
3
O-ring for locking pin
Probe packing (1)
12596
12630 2)
12597
11554
4
Primary packing
11505
5
6
Wear ring
Set screw M5x5
7
Hollow plug nut
8
Pipe plug
9
Sealing plug
12504
11503
11510
11515
11552
11557
11562
11506
11511
11514
11553
11558
11563
Material
Qty. for
Installation /
commissioning
Qty. for two
years operation
NiCrMo
4
4
Viton A
PTFE, 25% glass
filled
PTFE, 25% glass
filled
PTFE
SIS 2343
Duplex
6Mo
AISI 316L
Duplex
6 Mo
AISI 316L
Duplex
6Mo
AISI 316L
Duplex
6Mo
8
1
16
2
1
2
1
1
1
1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4
2
2
2
1
1
1
1
1
1
1
1
1
WARNING!
(1)
Pos. 3 “Probe packing” is not shown on picture of hollow plug. The packing is loaded
inside the hollow plug nut.
(2)
For use with PED 97/23/EC approved equipment
9
7
4
5
6
1
2
5
9
3
5
4
Figure 45: Hydraulic hollow plug spare parts
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
Document No.: F200-16959-I-MU-0113
7.2.2
Rev:
Page:
Date:
02
65 of 66
09.12.03
Mechanical hollow plugs
Ref. fig 46.(different material for some pos. no’s depend on material in hollow plug)
Pos.
Spare part
Part
No.
Material
1
2
3
Probe packing (1)
Primary packing
Set screw M5x5
4
Hollow plug nut
5
Pipe plug
6
Sealing plug
11554
11505
11503
11510
11515
11552
11557
11562
11506
11511
11514
11553
11558
11563
PTFE, 25% glass filled
PTFE, 25% glass filled
SIS 2343 (for 316L plug)
Duplex
6Mo
AISI 316L
Duplex
6 Mo
AISI 316L
Duplex
6Mo
AISI 316L
Duplex
6Mo
Qty. for
Installation /
commissioning
Qty. for
two
years
operation
1
1
1
1
1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
2
2
2
2
2
1
1
1
1
1
1
1
1
1
WARNING!
(1)
Pos. 1 “Probe packing” is not shown on picture of hollow plug. The packing is loaded
inside the hollow plug nut.
5
2
4
3
3
6
Figure 46: Mechanical hollow plug
CorrOcean ASA
Document Title: USER MANUAL FOR CORROSION PROBES
Document No.: F200-16959-I-MU-0113
Rev:
Page:
Date:
02
66 of 66
09.12.03
CHAPTER 8 REFERENCE FIGURES TABLE
This section contains a list of all referenced information and figures used in the manual.
Figure 1, Corrosion probes...................................................................................................4
Figure 2, Hollow plugs..........................................................................................................4
Figure 3, Repro A probe.....................................................................................................11
Figure 4, Repro B probe.....................................................................................................12
Figure 5, Repro C probe ....................................................................................................13
Figure 6, Tubular probe......................................................................................................14
Figure 7, The High Sensitive ER-probe ..............................................................................15
Figure 8, Triple B probe .....................................................................................................17
Figure 9, Two electrode B probe ........................................................................................18
Figure 10, Two electrode C probe ......................................................................................19
Figure 11, Triple C probe ...................................................................................................20
Figure 12, Galvopro B probe ..............................................................................................22
Figure 13, Galvopro C probe..............................................................................................23
Figure 14: Hydraulic hollow plug ........................................................................................24
Figure 15, Mechanical hollow plug .....................................................................................24
Figure 16, Hydraulic hollow plug ........................................................................................25
Figure 17, Hydraulic hollow plug for adapter.......................................................................25
Figure 18, Mechanical hollow plug .....................................................................................25
Figure 19, Corrosion probes...............................................................................................28
Figure 20: ER-probes.........................................................................................................29
Figure 21: LPR-probes.......................................................................................................31
Figure 22, Galvanic probes ................................................................................................33
Figure 23, Hollow plugs......................................................................................................34
Figure 24, Hydraulic access fitting system..........................................................................36
Figure 25, Hydraulic hollow plug ........................................................................................36
Figure 26, Mechanical hollow plug .....................................................................................37
Figure 27, Mechanical access fitting system.......................................................................37
Figure 28: Probe location spare parts.................................................................................38
Figure 29, Probe in hydraulic adapter.................................................................................38
Figure 30, Probe in hydraulic fitting ....................................................................................38
Figure 31, Probe in mechanical fitting.................................................................................39
Figure 32, Hydraulic hollow plug ........................................................................................41
Figure 33, Mechanical hollow plug .....................................................................................43
Figure 34, Hydraulic system...............................................................................................45
Figure 35, Mechanical system............................................................................................45
Figure 36, Hydraulic system...............................................................................................49
Figure 37, Mechanical system............................................................................................50
Figure 38, Hydraulic fitting..................................................................................................52
Figure 39, Hydraulic adapter ..............................................................................................52
Figure 40, Mechanical fitting ..............................................................................................52
Figure 41: Hydraulic system with flush probe......................................................................61
Figure 42: Corrosion probes...............................................................................................61
Figure 43: Mechanical system............................................................................................63
Figure 44: Corrosion probes...............................................................................................63
Figure 45: Hydraulic hollow plug spare parts ......................................................................64
Figure 46: Mechanical hollow plug .....................................................................................65