YS2-03-C10017-TL-SPC-Z-001 Rev. 0 (Cathodic Protection Specification)

CLIENT CONTRACTOR
FIELD GATHERING SYSTEM

TRUNKLINES DETAILED ENGINEERING
OMV (YEMEN BLOCK S2) CATHODIC PROTECTION SPECIFICATION GRIFFIN ENERGY LTD. /
EXPLORATION GMBH ZEN CHEMTECH / RISK WRITERS
Project Code: 03 Doc. No. YS2-03-C10017-TL-SPC-Z-001 Rev 0 Page 1 of 31
CATHODIC PROTECTION SPECIFICATION
TRUNKLINES DETAILED ENGINEERING PROJECT
0 8th March 2022 Issued for Design NV GP MK
APPR. BY
REV DATE REVISION DESCRIPTION PRPD. BY CHKD. BY APPR. BY
CLIENT
CLIENT CONTRACTOR
TABLE OF CONTENTS
1. INTRODUCTION .................................................................................................................................... 4
2. SCOPE OF WORK ................................................................................................................................. 5
ABBREVIATIONS .............................................................................................................................. 5
3. REFERENCE DOCUMENTS.................................................................................................................. 7
PROJECT DOCUMENTS ................................................................................................................... 7
COMPANY STANDARDS / SPECIFICATIONS ................................................................................. 7
INTERNATIONAL CODES & STANDARDS ...................................................................................... 7
4. SCOPE OF WORK ................................................................................................................................. 8
5. GENERAL REQUIREMENT ................................................................................................................... 9
6. DETAILED SCOPE OF WORK ............................................................................................................ 10
PRE-DESIGN SITE SURVEY ........................................................................................................... 10
MINIMUM REQUIREMENTS ............................................................................................................ 11
SOIL RESISTIVITY SURVEY ........................................................................................................... 12
STRAY CURRENT / INTERFERENCE ............................................................................................. 12
DESIGN ENGINEERING .................................................................................................................. 13
CATHODIC PROTECTION CRITERIA ............................................................................................. 14
DESIGN LIFE.................................................................................................................................... 15
CURRENT DENSITY REQUIREMENTS .......................................................................................... 15
CP CURRENT ATTENUATION ........................................................................................................ 15
TEMPERATURE CORRECTION ...................................................................................................... 15
POWER SOURCE ............................................................................................................................ 15
ELECTRICAL ISOLATION ............................................................................................................... 16

CLIENT CONTRACTOR
ANODE GROUND BED .................................................................................................................... 16
TEMPORARY CATHODIC PROTECTION SYSTEM ....................................................................... 17
COATING REPAIR ........................................................................................................................... 17
7. MATERIAL SPECIFICATION............................................................................................................... 18
IMPRESSED CURRENT ANODE..................................................................................................... 18
TRANSFORMER RECTIFIERS ........................................................................................................ 18
JUNCTION BOXES .......................................................................................................................... 19
TEST POSTS .................................................................................................................................... 20
BIG FINK TEST POST ...................................................................................................................... 20
NEGATIVE DISTRIBUTION / BOND BOX ....................................................................................... 21
CABLES AND CONNECTIONS ....................................................................................................... 21
POLARIZATION AND SPARK GAP ARRESTOR ........................................................................... 23
8. ENGINEERING ACITVITY ................................................................................................................... 24
9. INSTALLATION.................................................................................................................................... 25
10. COMMISSIONING ................................................................................................................................. 26
11. CATHODIC PROTECTION MANUAL ................................................................................................... 27
12. DOCUMENTATION ............................................................................................................................... 28
13. QUALITY ASSURANCE AND QUALITY CONTROL ........................................................................... 30
14. GUARANTEE ........................................................................................................................................ 31

CLIENT CONTRACTOR
1. INTRODUCTION
Griffin Energy Ltd. is pleased to support OMV (Yemen Block S2, Shabwah, Yemen)
Exploration GmbH (OMVY) to carry-out the Trunkline Detailed Engineering for two (2) 12”
Trunklines and one (1) 6” Trunkline buried between the existing Central Processing Facility
(CPF) and future three (3) Remote Manifold Stations (RMS) located at the existing EPF’s in
the field, covering an overall distance of approximately 22.443 km.
On completion of installation, it is anticipated that the Trunklines shall only be progressed up

to Ready for Commissioning (RFC) and not go in to service until upstream and downstream
facilities are completed.
Approx.
SN Trunk Line No. From To
Length (Km)
1 TL-1 (6”) Planned RMS-1 Location CPF 3.550 km
TL-2a (12”) - Option 1 Planned RMS-2 Location EPF-4 8.633 km
2 TL-2b (12”) - Option 2 BVS-1 @ TL Diversion Station Area CPF 1.765 km
TL-2c (12”) - Option 3 EPF-4 BVS-1 1.890 km
TL-3a (12”) - Option 1 Planned RMS-3 Location EPF-4 6.730 km
3 TL-3b (12”) - Option 2 BVS-2 @ TL Diversion Station Area CPF 1.765 km
TL-3c (12”) - Option 3 EPF-4 BVS-2 1.890 km

CLIENT CONTRACTOR
2. SCOPE OF WORK
Corrosion protection of the external surface of the pipelines shall be provided with high
integrity coating systems, supplemented by cathodic protection.
The document defines scope of work for temporary and permanent cathodic protection
system associated with Trunklines on project “Feed Services for Field Gathering System
Trunklines”.
ABBREVIATIONS
Abbreviation Description
3LPP 3 Layer Poly Propylene

AC Alternating Current
AJB Anode Junction Box
ASTM American Society for Testing and Materials
ATEX Atmosphere Explosive
BOM Bill of Materials
CIPS Closed Interval Potential Survey
CP Cathodic Protection
CS Carbon Steel
Cu-CuSO4 Copper-Copper Sulphate
DC Direct Current
DCVG Direct Current Voltage Gradient
EPBB Equipotential Bond Box
FEED Front End Engineering Design
FSBB Foreign Service Bond Box
GEL Griffin Energy Limited
ICCP Impressed Current Cathodic Protection
IP Degree of Protection as per IEC 60529
IR Voltage Drop
IJ/IF Insulating Joints/Insulated Flange
CLIENT CONTRACTOR
Abbreviation Description
Mg Magnesium
NACE National Association of Corrosion Engineers
NDB Negative Distribution Box
OHL Overhead Power transmission Line
OMV OMV (Yemen Block S2) Exploration GmbH (Company)
PVC Polyvinyl Chloride
ROW Right of Way
RP Recommended Practice
SP Standard Practice
TCP Temporary Cathodic Protection
TR Transformer Rectifier
UV Ultra Violet
XLPE Cross Linked Polyethylene
CLIENT CONTRACTOR
3. REFERENCE DOCUMENTS
PROJECT DOCUMENTS
Document No. Document Title Rev
Scope of Work – Trunklines Installation Field

YS2-03-D09035-SOW-Y-002-05 05
Gathering System
Proposed Pipeline Route of Trunkline 1 from

YS2-03-TL1-C10017-AS-L-001 A
RMS-1 to CPF

YS2-03-TL2-C10017-AS-L-001 A
RMS-2 to CPF

YS2-03-TL2-C10017-AS-L-002 A
Diversion Station ( BVS-1) to EPF-4
Proposed Pipeline Route of Trunkline 3 from A

YS2-03-TL3-C10017-AS-L-001
RMS-3 to CPF
Proposed Pipeline Route of Trunkline 3 to from A

YS2-03-TL3-C10017-AS-L-002
Diversion Station ( BVS-2) to EPF-4
COMPANY STANDARDS / SPECIFICATIONS
Reference No. Description
YS2-03-D09035-BOD-P-001-02 Field Gathering System Project Basis of Design
INTERNATIONAL CODES & STANDARDS
Reference No. Description
Control of External Corrosion of Underground or Submerged

NACE SP0169
Metallic Piping Systems
Recommended Practice of Alternating Current and Lightning

NACE SP0177
Effect on Metallic Structures
NACE SP0286 The Electrical Isolation of Cathodically Protected Pipelines
Petroleum and Natural Gas Industries - Cathodic Protection of

ISO 15589-1
Pipeline Transportation Systems - Part 1: On-land Pipelines
CLIENT CONTRACTOR
4. SCOPE OF WORK
Impressed Current Cathodic Protection systems for pipelines shall provide sufficient current
for all underground buried surface area of the pipelines.
Cathodic protection designs shall be completed by qualified CP engineers with a

considerable cathodic protection design experience and minimum industry qualification of
NACE CP Level 3 or 4 as outlined in as per specification.
Field measurements designs for the design shall be collected by an Engineer or Technician
with a minimum of five years verifiable cathodic protection field experience and industry
certification level of NACE CP Level 2 or higher as outlined in as per specification
The scope is to provide study, calculation, reports, design of the TCP / ICCP system
comprising of Transformer rectifier, Anodes, Cathodes, Anodes and Cathodes Junction
Boxes, Header and Tail Cables, and Reference electrodes.
ICCP design shall provide but not limited to the following;
• Detailed Scope of work

• Detailed design reports
• Detailed design calculations
• Detailed drawings, layouts and sketches
• Design basis and standard compliance
• Bill of material
• ICCP equipment details
• Equipment’s specifications and data sheets
CLIENT CONTRACTOR
5. GENERAL REQUIREMENT
The cathodic protection systems shall be designed as per standard YS2-03-D09035-BOD-P-

001-02. Cathodic Protection Design to provide protection for the design life of buried
pipelines.
The CP system design shall meet full compliance with client requirements, recommendations
and lessons learned. The CP system design shall take into consideration all existing metallic
structures of new UG pipelines and existing facilities with their CP systems.
Attention shall also be given to those unprotected buried structures in the vicinity of the
buried CP protected structures in the scope of this work, ensuring that there will no mutual
interference.
The site survey shall be performed to collect essential information on soil resistivity,
geographical factors and existing CP systems adequacy check, unprotected structures,
existence of stray currents, overhead power lines and any other important features and
design factors. A detailed site visit report shall be submitted that shall also include
identification of sites for new installation, any relocation/demolition of the existing system and
any upgrading of the existing system.
Where the pipeline crosses or parallels an overhead and / or buried electrical lines, Engineer
shall address interference and recommend remedial measures in the study report.
CLIENT CONTRACTOR
6. DETAILED SCOPE OF WORK
The scope of work for CP system to be undertaken shall include the following as a minimum:
Temporary CP system with sacrificial anodes shall be considered for buried pipelines.
Temporary design is for a maximum of 2 years or up to when ICCP is required for
commissioning whichever is earlier.
Permanent impressed current cathodic protection systems shall be provided for pipelines
from the tie-in up to the isolation joint. Where existing CP stations are used, those need to be
modify and/ or upgrade to incorporate the new buried pipelines.
PRE-DESIGN SITE SURVEY
The CP consultant shall visit the site after the contract awarded and before starting the
design work for data collection (especially drawings for existing systems, foreign structures /
pipelines).
Before proceeding with the site survey, the CP consultant shall;
• Review the detailed route and site topographic and geotechnical survey reports and
highlight to client any additional requirements/ discrepancies,
• Perform attenuation calculations to determine the potential locations for impressed
current ground beds to ensure that the protection criteria shall be attained over the
entire length of the pipeline.
• It shall be the responsibility of the CP consultant to perform all required site surveys
and investigations to ensure the collection of all necessary site data is appropriate to
the design of the CP systems under the SOW.
• CP consultant shall undertake an extensive site survey to achieve a competent
understanding to project CP requirements in the various areas and shall submit a
comprehensive site survey report.
• If the area to be surveyed is affected by seasonal changes, these shall be considered.
If possible, a survey shall be carried out during different seasonal conditions and the
most severe conditions shall be used for the design.
The survey shall include general information about the terrain including;
• All other information that is considered relevant to the design of the CP systems.
CLIENT CONTRACTOR
• All survey and metering equipment shall be suitably calibrated and the calibration
results included as part of the survey report.
• When existing CP stations are used, it shall be modified and/ or upgraded to
incorporate the new buried pipelines. The combined use of existing and new CP
systems shall be studied and made part of an integrated system. The study and
proposed integrated system shall be submitted to client for approval.
• All field recorded information (locations where resistivity was measured, CP stations,
foreign pipelines, road/ tack/ fence crossings, start and finish parallel AC/DC OHPL,
AC/DC OHPL crossings, ground beds, or any other relevant structure) shall be
recorded.
MINIMUM REQUIREMENTS
The survey shall include, as minimum;
• Information on the limits of the structures to be protected and CP isolation points.

• Identification and characterization of existing metallic equipment, buried or at grade,
3rd party, protected by CP facilities (pipelines / flow lines / well casings / ground beds
etc.) in close proximity and that may interfere or be interfered with the CP systems of
this project,
• Identification of suitable locations for ICCP systems ground beds and TR.
• Identification of the suitable locations for anode ground beds based on resistivity soil
data and any other consideration,
• Identification and confirmation of the availability of power supply for the systems,
• The characteristics of existing CP systems, especially TR locations, installed capacity,
actual output current and voltage, to eventually cater for the new equipment,
• Any relocation / demolition of the existing system and any upgrading of the existing
systems on – going or required,
• Consultant shall investigate possible sources of AC (High Voltage Power Lines) and
DC stray currents, a study supporting the proposals to mitigate their effect in its
design shall be carried out and submitted to client for approval.
CLIENT CONTRACTOR
SOIL RESISTIVITY SURVEY
Soil resistivity measurements shall be performed according to as per standard YS2-03-

D09035-BOD-P-001-02 using the Werner method.
Soil resistivity at deep well ground bed foreseen locations shall be measured up to the
foreseeable deepest point on the active column to allow for accurate calculation of ground
bed resistivity. An appropriate technique shall be used. During drilling of ground bed
boreholes collection of borehole data shall allow confirmation of the water table depth, as
well as confirmation of the soil resistivity.
Soil resistivity measurements shall be carried out along the new pipeline routes. At least two
readings shall be taken at 1,2,3 m depths, at 1 km intervals and when there are visual
changes in soil characteristics.
STRAY CURRENT / INTERFERENCE
AC Interference
Consideration will be given to special monitoring and mitigation requirements along the
pipeline to determine the risk of, and to protect against AC corrosion in the following cases;
• Where the overhead AC power transmission lines are rated at 132 kV up to 220 kV
and the pipeline is less than 500 m from the power line over a minimum distance of
500 m.
• Where the overhead power lines are rated at 33 kV and the pipeline is separated
laterally there from by less than 15 m over a 500 m parallelism.
• Where the overhead power lines are rated at 66 kV and the pipeline is separated less
than 100m over a parallel section of 0.5Km, interference mitigation shall be
applicable.
• CEN/TS 15280 gives guidance on the length of parallelism between power line and
pipeline that requires verification. If this shows that verification is required, computer
based specialized software will be utilized to analyze possible induced and conducted
AC effects.
• Mitigation methods will meet the requirements of CEN/TS-15280 and NACE SP0177
to ensure that the pipeline is maintained in a safe condition from introduced and
conducted fault effects from the power transmission system.
CLIENT CONTRACTOR
• AC mitigation at above grade appurtenances will consist of gradient control grids or

mats and polarization cells, where determined necessary by the AC interference
study.
DC Interference
Consideration will be given to special monitoring and mitigation requirements along the
pipeline to determine the risk of, and to protect against DC corrosion Interference in case of
pipeline crossing or paralleling, or in case of stray current due to foreign pipelines.
Interference with other buried pipelines or installation shall be measured while the CP system
is energized. Interference measurements shall be conducted as follows;
• Measure both the foreign pipeline and the interfering pipeline pipe-to-soil potentials
while the relevant sources of CP current that can cause interference are
simultaneously interrupted.
• Measure the pipe-to-soil potential at the other pipeline or installation while the CP
system is energized.
• The mean change of potential at any part of another pipeline or installation from
interference should not cause potentials outside the potential criteria not being
remedial action shall be taken to eliminate the interference.
• All installations and requirements shall be in accordance with the client specification
and international standards as applicable.
DESIGN ENGINEERING
Following acceptance by client of the site survey report, detailed design for the CP system
shall be carried out, according to YS2-03-D09035-BOD-P-001-02.
The cathodic protection systems, temporary and permanent, shall be designed so that any
external corrosion on the equipment is mitigated and any adverse stray current effects on the
equipment or on surrounding are avoided.
The design stage shall contain all information required for the procurement of CP equipment,
construction, commissioning, monitoring and hand over of the CP systems.
CLIENT CONTRACTOR
Consultant for CP feed shall provide any temporary system that is required until the final CP
systems are completed and up and running. Temporary design is for maximum 2 years or
when ICCP is required for commissioning whichever comes first.
CP consultant is fully responsible for;
• Developing CP documents in the EPC stage incorporating all applicable vendor data,
• Verifying vendor data and drawings before submitting them for client review,
Obtaining client final approval.
• The design shall also incorporate all items required for allowing the periodic
monitoring of CP System performance, including, as minimum, the following
monitoring facilities:
• Potential monitoring test posts,
• Isolation joints / isolation flange test posts,
• Buried CP coupon test stations, reference electrodes,
• HT Line test stations,
• Foreign service bonding test stations,
• Road / track / Fence crossings test stations,
• or other deemed necessary
Where AC power is not available and if required, suitable solar powered ICCP system
comprising of solar array, charge regulator, battery bank, DC distribution, etc. shall be
considered during the design by the consultant.
Updating of all specifications including any additional information, data, specification, etc. not
included in this SOW document and those necessary to be provided to complete the EPC,
shall be prepared by consultant as a part of the scope.
Typical drawings are attached to this SoW. Any additional drawing not included in this sow
documents or required modifications necessary to be provided to complete the EPC, shall
also be prepared by consultant as a part of the scope.
CATHODIC PROTECTION CRITERIA
The applicable CP criteria are defined in YS2-03-D09035-BOD-P-001-02 given as below;

CLIENT CONTRACTOR
Instant OFF potentials with respect to Cu/Cuso4 should be -950mv to -1200mv in soil
applications. Instant OFF potentials with respect to Ag/Agcl should be -900mv to -1150mv in
soil applications.
Where such level of protection is not achievable, and subject to company approval, the
system shall meet the criteria of 100mv polarization decays as per NACE SP0169Sections 2.
DESIGN LIFE
During Construction phase the temporary CP system shall be provided by using sacrificial
anodes for 2 years design life or till commissioning of the permanent CP system.
The permanent CP system shall be provided using MMO Tubular Titanium anodes by
feeding through Transformer Rectifier unit for 30years design life once sacrificial system
deactivated.
CURRENT DENSITY REQUIREMENTS
The design current densities shall be following for temporary cathodic protection system,
0.02 mA/m2 (0.1%) considered for coating breakdown initial) shall be considered for 2 years
design life.
For permanent cathodic protection system up to and including 30˚C temperature, 0.2 mA/m2
(1%) coating breakdown against 3LPP considered for 30 years design life.
CP CURRENT ATTENUATION
Sub-Contractor/Vendor shall demonstrate that the CP attenuation will be such that the
protection criteria shall be attained on the entire length of the pipelines. So it is necessary to
carry out attenuation calculation.
The control of the current output from the transformer rectifier unit to each of the pipelines
shall be achieved by adjusting variable resistors in the Cathodic Junction Box (CJB).
TEMPERATURE CORRECTION
For pipeline operating at elevated temperature, current density value shall be increased 25%
for each 10˚C rise in operating temperature above 30˚C
POWER SOURCE
DC power sources required for the CP systems should be;

CLIENT CONTRACTOR
• Oil cooled type in an IP65 enclosure with continuous electronic adjustment.

• TR Rating shall be defined as per design document.
• Location - TRs shall be located generally at ground bed locations (minimum 100
meters from wellhead) in non-hazardous or non-classified areas.
• Wherever, transformer rectifiers are used, powered from existing 415/240V sources,
separate earthing 35 mm2 wire shall be sued to connect the transformer body to the
distant existing earthing point at the power source side. All metallic points, non-
current carrying metallic equipment, structures, fence platform etc. shall in turn be
bonded to the transformer rectifier body through bonding conductor 16 mm2 and
earth bar as required. Where an earthing system is already in place, the CP
equipment shall be bonded using earthing conductor.
ELECTRICAL ISOLATION
Cathodically protected surface shall be electrically isolated from existing structure or earthing
system and at pipeline ends in accordance with standard YS2-03-D09035-BOD-P-001-02.
The resistance across isolation joints shall be measured immediately before welding onto
pipeline and it should be more than 1 MOhm.
ANODE GROUND BED
The following minimum design criteria shall apply to anode ground beds. Details can be
taken from standard YS2-03-D09035-BOD-P-001-02.
Anode ground beds shall be deep well type, with Mixed Metal Oxide (MMO) tubular anodes,
and individual Kynar insulated leads and a HMWPE outer insulated sheath and calcined
petroleum coke breeze back-fill.
Ground bed shall be located minimum 100 meters from any underground foreign metallic
structures, and minimum 150m from other ground beds.
The top of the active column shall be installed 10 meters below the minimum water table.
The top anode shall be installed 5 meters below the top of the active coke breeze column.
The bottom of the borehole shall be 3 meters below the bottom of the deepest anode.
The number of anodes will be 5 or 10 as proposed by CONSULTANT based on the design

criteria and commissioning current requirements.
CLIENT CONTRACTOR
Coke breeze consumption rate, anode ground bed current rating, ground bed resistance and
design life shall be considered for finalizing the active column of the deep ground bed.
Its resistance to earth allows max calculated current demand to be met at 80percentage or
less than the voltage capacity of the DC Source.
In general, client will approve the proposed locations for all new ground bed specifically
considering the possibility of any interfering upcoming/future structures coordinating fully with
the Concept Selection Engineer/Specialist of the particular field.
TEMPORARY CATHODIC PROTECTION SYSTEM
In case the installation of the permanent ICCP system is delayed and cannot be installed
during the pipe installation, a temporary cathodic protection by consumable Mg or Zn anodes
shall be installed.
Temporary CP system shall be designed and installed to cover the period until the expected
commissioning of the permanent cathodic protection system. Design of temporary CP shall
be submitted to client for approval.
Anode connections shall be constructed such that they can easily be connected/
disconnected during and/or after commissioning of the permanent system. The permanent
monitoring facilities connected to the pipeline shall be installed by the Pipeline Contractor
simultaneously with the pipeline to allow monitoring of the performance of the temporary
system.
COATING REPAIR
All below and aboveground cable connections shall be fully encapsulated with coating repair
material (Belzona 121 or Intergard 821) and holiday test shall be conducted after cable to
pipe joint encapsulations before backfilling.
Pin Brazing shall use specially designed cable lugs and brazing pins to braze the cables
directly onto pipeline and shall be approved by client. Welded pad used at IJ and drain
points.
CLIENT CONTRACTOR
7. MATERIAL SPECIFICATION
IMPRESSED CURRENT ANODE
The impressed current anodes for the CP of buried pipelines shall be made of MMO tubular
anodes compliant with client specifications.
The location of the ground beds is finalized after the site survey, normally in an area of lower
resistance. For this project, deep well ground beds are preferred then Shallow surface
ground beds for the following reasons;
• There is a risk of shielding by other pipelines (specially for parallel pipeline) or Buried
structures
• There is a risk of stray currents on adjacent installations
• There is a risk of a strong seasonal change in surface soil conditions. In general, the
surface conditions cannot meet the required anode resistance.
• Risk of damage by excavation (Surface ground beds)
Coke breeze backfill shall be used around impressed current anodes to enhance the CP
system efficient. The backfill will reduce the anode-to-ground resistance and will increase
anode life. Anodes shall be preferably purchased pre-packaged in backfill.
For regular monitoring and assessment of efficiency of cathodic protection system, the CP
system shall include different test posts including Big fink test posts.
TRANSFORMER RECTIFIERS
The Transformer-Rectifier (T/R) units shall be oil-cooled unit. Input supply will be 415V ± 5%
A.C, 50 Hz, 3-phase. Continuous A.C input voltage at 10% above the nominal value shall not
damage the transformer, the diode bridge assembly, or exceed any component ratings.
Moreover, the T/R shall be capable to withstanding a short circuit to up to 15 seconds
duration at the output terminal without damage to any of its devices.
The T/R shall be of a proven design and shall be designed to operate with minimum
maintenance over a 30 year-life in a remote, unattended desert environment at ambient
temperatures. They shall be located outside of the perimeter of hazardous area.
CLIENT CONTRACTOR
The units shall be provided with meters for the output voltage, current and permanent
reference electrodes voltage.
The T/R shall be supplied with an electronic timer ON/OFF switch. This shall be capable of
operating cyclically with a variable time period “ON” and “OFF” between 0.1 second and 100
second.
An earthing lug and manufacturer’s name / rating plate shall be fitted to the T/R enclosure.
The enclosures shall be made of 316 stainless steel externally coated.
JUNCTION BOXES
Junction boxes (AJB, CJB and BB) corresponding to anode, cathode and bonding junction
boxes respectively shall be made of stainless-steel type 316L, and shall be located outside of
the perimeter of hazardous area in accordance with safety regulations.
The Junction boxes shall be suitable for outdoor installation with a minimum ingress
protection of IP 55 as per IEC 60529. Cables shall run into the boxes in conduits along the
steel support and shall be terminated at the box bottom through cable glands.
Each junction box shall be provided with a mounting frame fabricated from suitably sized
steel angles and flats. The minimum size of the angle shall be 50 mm x 50 mm x 6 mm. The
minimum height of the frame shall be 1.5 m from the grade.
According to the experience obtained from previous projects, chlorination and deterioration of
anode junction box (AJB), anode cable lugs and terminals are observed, due to gas entering
from deep well to anode junction box through the GI conduit. In order to avoid this, all anode
cables need to be glanded separately and connected with anode junction box. In addition,
anode junction box and T/R installation should be higher than the ground level to avoid sand
accumulation.
The internal components, such as the number and sizes of tinned copper strips, cable
terminals, resistors, meters, any other particular components, shall be defined in the detailed
design carry out by Sub-Contractor and subject to client approval.
CLIENT CONTRACTOR
TEST POSTS
For regular monitoring and assessment of efficiency of cathodic protection system, the CP
system shall include different test posts including Big fink test posts. The test box shall be
made of stain less steel type 316L and shall be coated.
Test box shall have sufficient space for termination of test cables and for the installation of
bonding cables, resistors and shunts etc. as per the system requirements.
Depending on the type of CP monitoring system, different test facilities shall be installed
and, are classified as below;
• Monitoring Test Facility

• Test Facility across IJ
• Test facility for High Voltage Overhead Transmission Line facility
• Reference Cell and Coupon Test Facility
• Foreign Service Test Facility
• Cased Crossing Test Facility
The number of test facilities to be installed shall be determined by Subcontractor during

detailed design. Two types of test posts enclosures shall be used.
BIG FINK TEST POST
Big Fink type test post is to be used where no large component is required as per the circuit
requirements.
Test post shall comprise of terminal board, cap and base. The components shall be made of
high strength polycarbonate. The color of the big fink shall be Orange. It shall be suitable for
mounting on 3” conduit. The test post head shall have a concealed link to lock it to the base
plate.
It shall be provided with minimum five terminals for the termination of monitoring cables. The
material of terminals shall be nickel plated brass or stainless steel.
The support post shall be hot dip galvanized steel pipe, 3” dia and minimum thickness shall
be 5 mm. The length of the pipe shall be 2 m. The bottom 0.5 m shall be covered with
concrete foundation. The size of the foundation shall be 0.3 m x 0.3 m x 0.5 m.
CLIENT CONTRACTOR
NEGATIVE DISTRIBUTION / BOND BOX
The test post enclosures shall be fabricated from stainless steel type 316 L. It shall be
painted with one coat of urethane paint and the total dry film thickness (DFT) shall be 50-75
micron. The color shall be light grey to RAL 7036.
As an alternative the test posts enclosures may be of sheet steel construction. However it
shall have different painting specifications as per the following details;
The steel surfaces shall be blast cleaned to near white metal finish complying with NACE no.
2 or SSPC – SP10.
Before any visible darkening of the surfaces has occurred and within 3 hours of blasting, the
surfaces so prepared shall be coated as follows;
• One coat of epoxy primer (zinc rich or red oxide) – 50 microns

• One coat of high-build epoxy (polyamide cured) – One coat of recoat able urethane
finish. Total minimum dry film thickness - 150 microns
• The final paint color shall be light grey to RAL color no. 7036.
• The enclosure shall be weatherproof and minimum degree of ingress protection shall
be IP-55 in accordance with BS EN 60529.
The enclosures shall be suitably sized to accommodate all the components. These shall
have sufficient room to dissipate the heat generated without overheating the components or
enclosure.
These shall be provided with hinged door to provide easy access to all the internal
components.
The test post shall be provided with 6 mm thick phenolic panel to mount the components as
per the system design. All cable entries shall be through properly designed and rated double
compression cable glands. The enclosures shall be provided with gland plate(s).
CABLES AND CONNECTIONS
Cable sizes shall be selected and specified so as to have sufficient copper conductor cross
section to carry the maximum designed current load of the circuit without excessive voltage
(IR) drop in meeting the overall resistance requirements.
CLIENT CONTRACTOR
Minimum Conductor Insulation / Outer Outer

Application
Size (mm2) Sheath Colour
Potential Monitoring – Structure side 10 HMWPE XLPE / PVC Black
Potential Monitoring - Plant side, foreign

10 HMWPE XLPE / PVC Red
Structure
Sacrificial Anode tail cable 10 HMWPE XLPE / PVC Red
Coupon Cable 10 HMWPE XLPE / PVC Red
Reference cell cable 10 HMWPE XLPE / PVC Yellow
Bonding Cable – Structure side 16 HMWPE XLPE / PVC Black
Bonding Cable – Foreign Structure 16 HMWPE XLPE / PVC Red
XLPE / PVC (or)

Anode header cable 16 Black
Kynar / HMWPE
Power feed cable, anode header cable 16 HMWPE XLPE / PVC Red
Zinc grounding cell 25 HMWPE XLPE / PVC Red
Grounding cable at OHL mitigation 35 HMWPE XLPE / PVC Black
Negative Header cable 50 HMWPE XLPE / PVC Black
Positive Header cable 50 HMWPE XLPE / PVC Red
The cable connection to the pipeline/ structure shall be designed to ensure adequate
mechanical strength and electrical continuity and to prevent damage to pipeline and
structure.
All below grade cable connection shall be fully encapsulated to comply with the original
coating standards. A holiday test shall be conducted before backfilling.
Following methods are recommended for cable connections;
Method of Cable Connection

Structure
Current Carrying Cable Monitoring Cable
Existing Pipeline Pin brazing Pin brazing
New Pipeline Pin Brazing Pin brazing
CLIENT CONTRACTOR
POLARIZATION AND SPARK GAP ARRESTOR
Polarization cells shall be soil state devices designed to simultaneously provide isolation for
DC current and low resistance path for AC current. The device shall require minimum
maintenance. The device shall have weather proof enclosure and shall be suitable for
mounting inside a test station. Unless otherwise specified in the project specifications/ data
sheet the DC blocking voltage shall not be less than 1.2 Volts. The DC leakage current at 1.2
volt shall not be more than 0.5 mA.
The device shall be suitable for continuously conducting AC steady state current and short
time AC short circuit current as indicated in project specifications/data sheet.
Explosion proof surge diverters / spark gaps shall be used for the protection of Isolation
Joints / Isolation Flange Kits against lightning surges and fault currents. The units shall be
supplied complete with 25 mm2 flexible interconnecting cable of minimum length 0.3 m and
cable terminations suitable for installation across monolithic Isolating Joints (MIJ) and
Isolation Flange (IF).
CLIENT CONTRACTOR
8. ENGINEERING ACITVITY
The design package submitted by Subcontractor for review shall contain at minimum;
• Site survey report

• Professionally drafted full size CP drawings including the proposed location for each
piece of CP equipment (rectifiers, anodes, junction boxes, bond stations, test
stations and ground beds), with a numbering system (sequential order) for test
points and junction boxes.
• All calculations and applicable field data required to verify design compliance with
the specification and all cathodic protection Engineering Standards listed in this
specification
• Measurement and mitigation of electrical interference from foreign sources
• Commissioning and start up procedure
• DCVG & CIPS test reports
• Installation procedures
• Operating and maintenance manual
Any deviations from the set criteria for design, to be highlighted in the Survey report for
COMPANY approval
Contractor shall accompany COMPANY Operations and Construction staff for mutual
agreement and approval on Ground Bed and CP compound locations where required.
CLIENT CONTRACTOR
9. INSTALLATION
The installation of the CP systems shall be carried out under the supervision of a NACE
certified Cathodic Protection specialist. Installation, testing and commissioning of the entire
cathodic protection shall be in accordance with client Specifications and as per the approved
construction drawings and approved design package. All modifications to approved
drawings/specifications, if approved by client and implemented during construction shall be
recorded on marked up as built drawings.
A detailed installation procedure shall be submitted to client for approval prior to the
installation. It shall include;
• Written procedures for the installation of the CP system.

• A time schedule for the installation of the system.
• Written procedures of all tests required to demonstrate the specified quality of
installation (Inspection and Test Plan).
• All relevant construction drawings including but not limited to locations of cathodic
protection test facilities, cable routing, single line schematics, wiring diagrams etc.
• Written procedures to ensure safe working practices during the installation and
operation of the cathodic protection system.
• Written procedures for pre-commissioning, testing, inspection and commissioning of
the new installations.
• The CP Commissioning shall include as a minimum for each pipeline a Close
Interval Potential Survey (CIPS), a Direct-Current Voltage Gradient survey (DCVG)
and interference detection and mitigation.
CLIENT CONTRACTOR
10. COMMISSIONING
A detailed commissioning procedure shall be submitted to COMPANY for approval along with
the detailed design of the CP system.
Pre-commissioning checks shall be performed to ensure that the equipment have been
properly installed and shall perform as per the project requirement. They include:
• Testing of the ground-beds, including resistance to earth,

• Testing of the power source
• Testing of Junction Boxes and test facilities
• Verification of electrical resistance of isolation devices (MIJs, IF Kits)
Corrective action, as dictated by pre-commissioning checks shall be undertaken before

energization of the system.
Commissioning checks shall follow strictly the guidelines of client engineering specifications
which describe in detail the minimum checks to be performed;
• Impressed Current cathodic Protection

• Temporary Cathodic Protection
For ICCP systems, particular attention shall be given to the possible interference between
the new structures and existing structures (foreign). Interference tests between structures
require interrupting the power sources and recording the swing at the other structure.
Mitigation measures shall be implemented if a positive swing of more than 20 mV is
observed.
CLIENT CONTRACTOR
11. CATHODIC PROTECTION MANUAL
A cathodic protection manual shall be submitted by the Sub-Contractor / Vendor after

successful commissioning. The manual shall be in accordance with client specifications and
as a minimum includes the following:
• Description of the system and system components and their purpose.

• Potential criteria for the system
• Pre-commissioning and commissioning results.
• As-Built Drawings.
• Contractor’s documentation for equipment and materials installed.
• Monitoring procedures for each of the monitoring facilities.
• Guidelines for the safe operation of the cathodic protection system.
• Method statements, test procedures and test plan and Spare parts list for major
equipment.
CLIENT CONTRACTOR
12. DOCUMENTATION
The following minimum documents to be submitted by the CP consultant to client for

review/approval as applicable to client.
• Deliverable list of CP documents and drawings.

• Engineering Document and Materials deliverable schedule.
• Weekly and Monthly progress Report (Engineering and Installation)
• Pre design site survey procedure.
• Pre design site survey report (with study report for the existing ICCP system).
• Detailed Engineering design report (TCP / ICCP system)
• Design and Layout drawings
• Equipment layout and Construction drawings.
• CP Bill of materials.
• Installation schedule for Test Post, TCP anodes, CP Cable and JB’s,
• Materials data sheet for all CP Materials and Equipments.
• TR unit specification and circuit diagram.
• FAT Procedure for CP Materials and Equipments
• FAT Report for CP Materials and Equipments
• ITP for Installation, pre commissioning and Commissioning.
• ICCP & TCP Installation procedure and check sheets.
• ICCP & TCP Commissioning procedure and check sheets.
• CIPS / DCVG survey procedure.
• DC interference survey procedure and report
• AC Interference study procedure
• Computer Modelling and study report for AC Interference
• AC Mitigation design and installation procedure.
• Pre commissioning and commissioning report.
• CIPS / DCVG survey report and recommendation.
• List of Spare Parts (for 2 year Operation and Maintenance).
• As built drawings.
CLIENT CONTRACTOR
• Operation and maintenance manuals (shall be compiled with Design Reports,

Installation Procedure, Installation, pre commissioning and Commissioning
check sheet, Material data sheet, performance test certificate for all CP
materials, Commissioning Procedure, Commissioning Report, As Built Drawing,
Spare Parts List, and Operation and maintenance manual).
CLIENT CONTRACTOR
13. QUALITY ASSURANCE AND QUALITY CONTROL
Quality Systems shall be submitted by Sub-contractor / Vendor for review and approval. As a
minimum the quality system must meet the requirements of ISO 9000 and as further detailed
in the project instructions.
A detailed Quality System shall be provided with the offer. The client reserves the right to
carry out a quality and technical review at Sub – Contractors Vendors’ facilities.
CLIENT CONTRACTOR
14. GUARANTEE
The sub-contractor / Vendor shall be responsible for providing against defects in design,
materials and workmanship for a period specified in the Contract. Defects found, if any, shall
be required at VENDOR’s own cost within the agreed time.

YS2-03-C10017-TL-SPC-Z-001 Rev. 0 (Cathodic Protection Specification)

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YS2-03-C10017-TL-SPC-Z-001 Rev. 0 (Cathodic Protection Specification)

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CLIENT CONTRACTOR

FIELD GATHERING SYSTEM

Project Code: 03 Doc. No. YS2-03-C10017-TL-SPC-Z-001 Rev 0 Page 1 of 31

CATHODIC PROTECTION SPECIFICATION

TRUNKLINES DETAILED ENGINEERING PROJECT

0 8th March 2022 Issued for Design NV GP MK

Project Code: 03 Doc. No. YS2-03-C10017-TL-SPC-Z-001 Rev 0 Page 2 of 31

2. SCOPE OF WORK ................................................................................................................................. 5

PROJECT DOCUMENTS ................................................................................................................... 7

COMPANY STANDARDS / SPECIFICATIONS ................................................................................. 7

INTERNATIONAL CODES & STANDARDS ...................................................................................... 7

4. SCOPE OF WORK ................................................................................................................................. 8

5. GENERAL REQUIREMENT ................................................................................................................... 9

6. DETAILED SCOPE OF WORK ............................................................................................................ 10

PRE-DESIGN SITE SURVEY ........................................................................................................... 10

MINIMUM REQUIREMENTS ............................................................................................................ 11

SOIL RESISTIVITY SURVEY ........................................................................................................... 12

STRAY CURRENT / INTERFERENCE ............................................................................................. 12

DESIGN ENGINEERING .................................................................................................................. 13

CATHODIC PROTECTION CRITERIA ............................................................................................. 14

CURRENT DENSITY REQUIREMENTS .......................................................................................... 15

CP CURRENT ATTENUATION ........................................................................................................ 15

TEMPERATURE CORRECTION ...................................................................................................... 15

POWER SOURCE ............................................................................................................................ 15

ELECTRICAL ISOLATION ............................................................................................................... 16

Project Code: 03 Doc. No. YS2-03-C10017-TL-SPC-Z-001 Rev 0 Page 3 of 31

ANODE GROUND BED .................................................................................................................... 16

TEMPORARY CATHODIC PROTECTION SYSTEM ....................................................................... 17

COATING REPAIR ........................................................................................................................... 17

IMPRESSED CURRENT ANODE..................................................................................................... 18

TRANSFORMER RECTIFIERS ........................................................................................................ 18

JUNCTION BOXES .......................................................................................................................... 19

TEST POSTS .................................................................................................................................... 20

BIG FINK TEST POST ...................................................................................................................... 20

NEGATIVE DISTRIBUTION / BOND BOX ....................................................................................... 21

CABLES AND CONNECTIONS ....................................................................................................... 21

POLARIZATION AND SPARK GAP ARRESTOR ........................................................................... 23

8. ENGINEERING ACITVITY ................................................................................................................... 24

10. COMMISSIONING ................................................................................................................................. 26

11. CATHODIC PROTECTION MANUAL ................................................................................................... 27

12. DOCUMENTATION ............................................................................................................................... 28

13. QUALITY ASSURANCE AND QUALITY CONTROL ........................................................................... 30

14. GUARANTEE ........................................................................................................................................ 31

Project Code: 03 Doc. No. YS2-03-C10017-TL-SPC-Z-001 Rev 0 Page 4 of 31

On completion of installation, it is anticipated that the Trunklines shall only be progressed up

TL-2a (12”) - Option 1 Planned RMS-2 Location EPF-4 8.633 km

2 TL-2b (12”) - Option 2 BVS-1 @ TL Diversion Station Area CPF 1.765 km

TL-2c (12”) - Option 3 EPF-4 BVS-1 1.890 km

TL-3a (12”) - Option 1 Planned RMS-3 Location EPF-4 6.730 km

3 TL-3b (12”) - Option 2 BVS-2 @ TL Diversion Station Area CPF 1.765 km

TL-3c (12”) - Option 3 EPF-4 BVS-2 1.890 km

Project Code: 03 Doc. No. YS2-03-C10017-TL-SPC-Z-001 Rev 0 Page 5 of 31

3LPP 3 Layer Poly Propylene

Project Code: 03 Doc. No. YS2-03-C10017-TL-SPC-Z-001 Rev 0 Page 6 of 31

Project Code: 03 Doc. No. YS2-03-C10017-TL-SPC-Z-001 Rev 0 Page 7 of 31

Document No. Document Title Rev

Scope of Work – Trunklines Installation Field

Proposed Pipeline Route of Trunkline 1 from

Proposed Pipeline Route of Trunkline 2 from