14050642 100 PL SPC 0002_Rev B_ Pipeline Pigging Philosophy

7/26/2019 14050642 100 PL SPC 0002_Rev B_ Pipeline Pigging Philosophy

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EFFLUENT WATER TREATMENT AND INJECTION

PLANT (NK)

Project No. EF/1761

Class 1

CONTRACT NO. 14050642 Page 1 of 20

PIPELINE PIGGING PHILOSOPHY Rev B

Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

B 17.01.2016 Re-Issued For Approval SV AC PC

A 22.07.2015 Issued For Approval SV AC PC

Rev Date Description Prepared By Checked ByApproved

By

PROJECT :Effluent Water Treatment And Injection Plant(NK)

CONTRACT NO : 14050642

OWNER : KUWAIT OIL Company

CONTRACTOR : Dodsal Engineering & Construction Pte. Ltd.

DOCUMENT NO. : 14050642-100-PL-SPC-0002

DOCUMENT REVISION STATUS : B

DOCUMENT TYPE : E (Engineering Drawing/Document)




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REVISION RECORD:

RevisionNo.

Reason for Revision Date

A Issued For Approval 22.07.2015B Re-Issued For Approval 17.01.2016




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PAGE INDEX

Page Revision Page Revision

B C D 1 2 3 B C D 1 2 312

345

67891011 X 12

13 X 14 X 15161718

19 X 20 X




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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

TABLE OF CONTENTS

1. PROJECT DESCRIPTION ……………………………………………………………………………….. 5

2. PURPOSE OF THE DOCUMENT ………………………………………………………………….….. 6

3. TERMINOLOGY …………………………………………………………………………………..…….. 6

4. REFERENCES, CODES, STANDARDS AND SPECIFICATIONS ……………………………….. 8

5. OVERVIEW OF PIPELINE PIGGING ……………………………………………………………………… 10

6. PIPELINE REQUIREMENTS ……………………………………………………………………………….. 15

7. PIGGING PLAN AND CONSIDERATIONS ……………………………………………………………. 17

8. PIGGING FREQUENCY ……………………………………………………………………………….. 19

9. CONCLUSIONS …………………………………………………………………………………………. 20

10. RECOMMENDATIONS ……………………………………………………………………………….. 20




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Project No. EF/1761

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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

1. PROJECT DESCRIPTION

The purpose of this project is to provide sufficient injection water to meet the requirements of the North

Kuwait well injectors. To this end, the EW Treatment and Injection Plant (NK) (EWTIP) will be located

between the Sabriyah and Raudatain fields. EWTIP consists of a 950 MBWPD (1045 MBWPD design)

effluent water (EW) treatment plant and a 500 MBWPD (550 MBWPD design) EW injection facility. The

EWTIP treatment system is divided into two identical trains each designed to treat 522.5 MBWPD. The

plant includes collection tanks that receive effluent water from:

• GC-15 (200 MBWPD normal; 220 MBWPD design)




• GC-29 (240 MBWPD design)



Collected effluent water from GCs is treated in the EW treatment facility to meet the required quality

specification for injection. Prior to injection, the treated water is stored in the Treated Water Tanks.

These tanks may also receive effluent water from GC-29, GC-30 and GC-31 to maintain the required

amount of injection water, should one of the primary source GCs be shut down.

A portion of the treated effluent water is also to be transferred from the treatment plant to the effluent

water collection tank of the CIPF (EF/1071, Effluent Water Injection Plant, Phase I). To minimize the size

of the Treated Water Tanks and eliminate the need to install new dedicated treated effluent water

transfer pumps, this treated water is pumped directly from the outlet of the new effluent water treatment

plant upstream of the Treated Water Tanks.

Inline Booster and High Pressure (HP) Injection Pumps capable of maintaining 255 barg (3700 psig) at

the farthest injector wellhead are included along with injection headers and injection lines to injection

wells.




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Project No. EF/1761

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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

2. PURPOSE OF THE DOCUMENT

The purpose of this document is to establish the pigging requirements and methodology for all piggable

lines of EWTIP project scope. This document further provides the technology and methodology available

to company to carry out the post-construction cleaning, operational cleaning and inspection relatedpigging programs. The consideration includes the corrosion monitoring purpose also.

The relevant systems considered for this pigging philosophy are:

Water Injection Pipelines

Distribution pipelines

Manifold pipelines

Flowlines

Fuel gas Pipeline

Recovered oil Pipeline

This philosophy provides summary of the main requirements pertaining to the pigging of these pipelines.

All Manifold pipelines and Flowlines are provided with temporary pig trap facilities and other pipelines

are provided with permanent pig trap facilities.

It shall be noted that all water injection distribution headers, manifold and flow lines shall have no

operational and intelligent pigging. Only cleaning pigs shall be used provided the pigs does not damage

HDPE lining.

Pigging is normally required for the Inspection of Pipelines in terms of corrosion, Pipeline integrity and to

clean the debris and other unwanted materials deposited inside the Pipelines.

3. TERMINOLOGY

For the purpose of this document, the words and abbreviations listed below shall have the explanations

as follows:




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3.1. DEFINITIONS

COMPANY Kuwait Oil Company (K.S.C)

CONTRACTOREPC Contractor nominated to carry out the project,

Dodsal Engineering and Construction Pte Ltd.

PROJECT Works related to contract no: 14050642.

WORK Activities required to be completed by the CONTRACTOR

SHALLThe word “SHALL” is understood to be mandatory to

comply with the requirements.

SHOULD

The word “SHOULD” is understood to be strongly

recommended to comply with the requirements.

3.2. ABBREVIATIONS

API American Petroleum Institute

ASME American Society of Mechanical Engineers

EWTIP Effluent Water & Treatment Injection Plant

CIPF Central Injection Pumping Facilities

GC Gathering Centers

CA Corrosion Allowance

CP Cathodic Protection

KM Kilo meters

FEED Front End Engineering Design




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FG Fuel Gas

HSAW / SSAW Helical or Spiral Submerged Arc Weld

LSAW Longitudinal Submerged Arc Weld

LP Low Pressure

NACE National Association of Corrosion Engineers

SMLS Seamless

TCP Temporary Cathodic Protection

CS Carbon Steel

P&ID Piping & Instrumentation Diagram

HDPE High Density Poly Ethylene

FBE Fusion Bonded Epoxy

SOP Standard Operational Procedure

4. REFERENCES, CODES, STANDARDS AND SPECIFICATIONS

KOC performs pigging activities based on its specification 015-IH-1004. Thus this philosophy is incompliance with the requirements of that specification.This document is developed with reference to the latest revisions of the following standards /specifications:

4.1. KOC STANDARDS

KOC-G-007 - Basic design Data

EWTIP-00-GE-BOD-0001 - Basis of Design

015-IH-1001 - Pipeline Construction

015-IH-1002 - Pipeline Design




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EWTIP-20-PL-SPC-0002 - Addendum to KOC Specification: Pipeline Design (015-

IH-1002 rev1)

015-IH-1004 - Pipeline Pigging and Hydrostatic test

EWTIP-20-PL-SPC-0015 - Addendum to KOC Specification: Pipeline Pigging and

Hydrostatic Test (015-IH-1004 rev1)

015-IH-1005 - Pipeline Dewatering, Drying and Purging

KOC-MP-005 - Standard for Pipeline Pig Trap Systems

KOC-MS-002 - Induction Bends

KOC-MS-001, PART 1 - KOC Material Specification for Line Pipe for Sour Service

4.2. KOC STANDARD DRAWING

55-04-72 - Typical Barred Tee Details

4.3. CODES AND STANDARDS

ASME B31.4 - Pipeline Transportation Systems for Liquids and Slurries

ASME B31.8 - Gas Transmission and Distribution Piping Systems

NACE SP0102-2010 - In-Line Inspection of Pipelines

API RP 1163 - In-Line Inspection Systems Qualification

API RP 1110 - Recommended practice for pressure testing of liquid petroleum

pipelines

4.4. PROJECT DOCUMENTS

14050642-100-PL-DBM-0001 - Pipeline Design Basis

14050642-700-PR-DBM-0001 - Process Design Basis and Design Criteria




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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

5. OVERVIEW OF PIPELINE PIGGING

5.1. GENERAL

This pigging philosophy assess the minimum requirements of pigging activities that consist of post-

construction cleaning, operational cleaning and inspection related pigging of all applicable lines to clean

and determine any potential wall thickness losses and to check any other geometrical defects.

All pipelines shall be cleaned, gauged and hydro tested in accordance with the project pigging and

hydro static testing specification 015-IH-1004 and its addendum EWTIP-20-PL-SPC-0015.

Following requirements should be fulfilled to ensure pigging is a viable option and to minimize the risk of

the pig becoming stuck in the line:

a) Appropriate pig traps for launching and receiving the tool. The Barrel diameter shall be two

pipe sizes larger than the pipeline size. All Launcher / Receiver shall be capable of accepting

intelligent pigs and bi-directional capable of launching as well as receiving.

b) Sufficient flow rate and pressure to provide the required tool speed and stability. Design

pressure and flow shall be at least as high as the connecting pipe segments.

c) Pipeline should be clean and free of obstructions. Bends shall have a minimum radius of five

pipe diameters. All valves and other inline devices shall be full bore to enable pig passage.

d) Evaluation of bore restrictions and over-bore pipe by means of gauging pig: this should be

evaluated to ensure tool drive and minimum distances between sensors and pipe wall.

e) Use of adjacent and unbarred tees to avoid the tool becoming stuck inside the pipe.

f) All necessary hose connections with isolating flanges are to be considered for use of mobile

pig launcher / receivers.

5.2. TYPES OF PIGGING ACTIVITIES

1. Pipeline Pre-commissioning




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Following the completion of pipeline construction, a cleaning operation using a suitable pig train shall be

carried out. All metallic pipelines in the EWTIP Project shall be subjected to post construction pigging

activities which will form part of the acceptance testing as shown below:

Line cleaning to remove any loose debris and mill scale.

Gauging to confirm minimum diameter, weld beads and any possible damage during installation.

Metallic pipelines with HDPE internal lining shall be inspected prior to the lining.

Water filling activities for hydrostatic testing.

Water removal and where necessary, drying of the pipeline (for gas pipelines).

2. Operational Pigging

The pipeline may be expected to contain entrained solids or debris within the process fluids which may

restrict or obstruct the bore of the line pipe, preventing free flow of fluids. The objectives of the

operational pigging shall be to carry out all or some of the following activities during the life of the

pipeline:

To swab pipelines with chemicals, methanol or corrosion inhibitor.

To periodically remove liquids, scale, dirt, debris and / or sand.

Emergency line clearance in case of blockages.To maintain product flow efficiency throughout the pipeline operating life.

Note: Pipelines with HDPE and FBE internal lining shall not be subject to inspection - caliper / gauge

type pigging as it may damage the lining.

5.3. CONSIDERATIONS AND SELECTION

a) During Construction, various types of Pigs are to be used. For cleaning purpose

(scrappers), Filling & Dewatering (Polyurethane or cup type), Detection of dents (gaugingPigs).

b) Additionally to select an appropriate inspection tool, consideration should be taken into

account of:

Detection Sensitivity.

Differentiation between types of anomalies.

Sizing accuracy.

Location Accuracy.

Requirements for Defect Assessment.

B

B




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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

c) The operator should also assess the general reliability of the inspection method by reviewing

the following:

Confidence level of the inspection method.

History of the inspection method / tool.

Success rate / failed surveys.

Ability of the tool to inspect the full length and circumference of the section.

Similarly, the purpose of a particular run determines the type of pig to be used; there are a variety of

reasons for pigging:

Initial Cleaning – to remove construction debris, thereby increasing the pipelines efficiency

and preventing damage to equipment.

Bore Proving Run – to gauge or survey any restrictions or pipe deformations such as dents

and buckles.

Dewatering – to remove water after hydro-testing from the newly constructed pipeline.

Commissioning – to provide a barrier to separate batches of nitrogen and hydrocarbon.

In Service Cleaning – during operation, pipelines may accumulate water, corrosion products

(rust scale), condensate (gas pipelines) and compressor oil as well as sand or dust, all of

which must be cleaned out on a regular basis to maintain efficiency of operation.

Basic line survey shall be carried out prior to Commissioning to identify dents, gouges

wrinkles etc.

Pipeline Corrosion Control / Mitigation – to perform anti-corrosion chemical treatments (by

inhibitors and/or bactericides).

Evaluation of the above requirements should be carried out by the experienced tool vendor

to ensure that the pig can safely pass through the line without any problem.

The following section describes the application of the various pigging technologies and outlines the

capabilities of the different tools during operational activities as well as defect detection and

discusses tool selection for particular applications, namely Pipeline Cleaning, Bore Proving, and

Anti-Corrosion Treatments.




PLANT (NK)

Project No. EF/1761

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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

5.4. TYPES OF PIGS

5.4.1. Gauging Pig

A gauging plate formed out of aluminum with a diameter of 95% of the nominal diameter will be

used to prove that the pipeline has a minimum clear bore from one end to the other.

5.4.2. Polly Pig

The flexible polyurethane pig is ideal for applications when the pipeline condition is not well known,

and the primary requirement is to ensure the pig does not block the pipeline.

5.4.3. Foam(Swabbing) Pig

Foam pigs are used to remove dust or fluids from the pipeline. They are very flexible and have bi-

directional capability. They are capable of passing through reduced internal pipe diameters and/or

partial obstructions and then expand back to their original normal size.

5.4.4. Cup Pig

These pigs are designed for use in long runs in which wear may be a special concern. They are

specified for commissioning of pipelines as an alternative to bi-directional pigs, and for separation of

different media. These pigs can be fitted with a gauging plate.

5.4.5. Brush Pig

The brush pig is a bi-directional cleaning tool that cleans without scraping the interior wall of the

pipeline. It uses both metallic and non-metallic brushes, and is as vigorous and versatile as other bi-

directional pigs.

5.4.6. Circumferential Brush Pig

The circumferential brush pig is similar to a regular brush pig, but its cleaning brushes are non-

segmented and therefore cover the full 360 degrees of pipe wall.

5.4.7. Bi-Directional Pig

Disc displacement pigs are used for standard pigging operations such as filling and dewatering

during hydrostatic testing, routine batching operations, product removal, or any pigging operationrequiring bidirectional use. These pigs are also very effective for product separation. They are

available in sizes from 2" through 48" with configurations including 2-disc and 4-disc as standard.

When equipped with a gauging plate, they are used to prove pipe roundness and to ensure

B




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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

excessive weld penetration or debris does not exist. Also, they are used to prove minimum bend

radius prior to intelligent pig use.

5.4.8. Pig Suppliers

Pig suppliers shall be selected from the KOC approved contractors list.

5.5. TYPES OF PIGGING FUNCTIONS

Following types of pigs are required for the EWTIP Project pipelines:

a) Cleaning pigs, with one or more plastic cups or discs at each end and polyurethane blades or

hardened steel brush units in between, attached to a central steel body by springs to maintain

pressure against the pipe wall as the blades / brushes wear down.

b) Batching pigs, similar to the cleaning pig but without the blades and brushes.

c) Gauging pigs, carrying a thin metal disc that is a little smaller than the pipeline internal diameter, tobe run during pre-commissioning or ahead of an inspection pig to check for obstructions.

5.6. PIGGING REQUIREMENTS

The use of the pigs listed above, either alone or in combination, should be defined by a procedure

for particular conditions. Consideration needs to be given to running pigs in the various KOC

pipelines to fulfill the following duties:

1. Cleaning, gauging, hydrostatic test filling and dewatering during commissioning.2. Wax, asphaltenes, rust and scale removal in liquid lines.

3. Separated water phase removal in liquid lines.

4. Liquids removal from liquid lines on shutdown for repair.

The main reason for requirement of pigging is to maintain the pipeline at its optimum throughput

capacity, and thus at maximum efficiency. The cleaning programme for the pipeline should be

formulated so as to minimise the buildup of wax and sand deposits, accumulation of debris and

settlement of liquids. If any of these conditions are expected during the lifetime of the pipeline, then

facilities for launching and receiving cleaning pigs and other types of pigs should be installed.

B




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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

6. PIPELINE REQUIREMENTS

The design parameters that are acceptable are set out below:

6.1. BENDS

All pipelines shall be designed with a minimum bend radius of 5D. Mitre bends are not permitted. Straightruns of pipe between bends shall be 1m minimum. This distance can be reduced if the bend radius is

more than 5D.

6.2. PIG HANDLING

The jib cranes (davits) will be capable of handling operational pigs listed with approximate weight in the

table below (to be confirmed with manufacturers of pigs).

Pipeline NB (inch) Transported product Cleaning pig weight (Kg)20 Injection Water 54 – 67 Kgs

14 Injection Water 16 – 19 Kgs




6 Injection Water / Recovered Oil / Fuel

Gas

4 – 5 Kgs

Source: T D Williamson Pigging Products Catalog

Space must be provided at the rear of the pig traps to enable pigs to be inserted into and retrieved from

the traps. It is recommended to have a working area with a distance of at least the longest pig length

plus 1 meter along the axis of the pig trap and a distance of 1.8m for pipelines 4” to 32” and 3.0m for

pipelines greater than 32” in transverse direction as in Figure below:




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Figure: Working Area

6.3. TEES

All Branch connections on main pipelines that are equal or greater than 50% of the main pipeline

diameter shall be provided with barred tees. Sphere tees are not to be used due to corrosion concerns.

Refer to KOC Standard Drawing 55-04-72 for fabrication details of barred tees for the Fuel gas,

recovered oil & Water Injection pipelines.

6.4. PIG SIGNALLERS

Bi-directional intrusive type pig signallers shall be installed on both sides of each pig trap isolation valve,

and any sectionalizing valves, if applicable.

Pig signallers shall not be located closer to any in-line valve or barred tee than the maximum pig length

to be used, to ensure that signaller activation does not occur until the rear of the pig has passed through

the obturator of the valve or the branch opening of the tee. Pig signallers shall be intrusive type

(mechanical flag with an electrical switch on pipeline and only mechanical type on pig trap), equipped

with double flanged isolation valves and retractable under full pipeline pressure.

Reference is made to the KOC standard for pipeline pig trap systems, KOC-MP-005 Section 8.14 for

further information on pig signalers (pig alerts).




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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

7. PIGGING PLAN AND CONSIDERATIONS

In order to operate this EWTIP project pipeline systems effectively, the inside of the pipeline has tobe periodically cleaned or inspected. This is performed using a Pipeline Internal Gauge (PIG) tool.

SOP for pigging during normal operation shall be developed by commissioning / operation team tosuggest type of pig, pigging frequency, pigging velocity & pressure drop during pigging, flow rate tobe maintained in different sizes of pipelines. This SOP shall be prepared case to case well before

the pigging schedule to facilitate smooth pigging operation.

SOP shall be separately prepared for the oily water (recovered oil) considering sludge removal forthis pipe line. As well, a separate SOP shall be prepared for FG pipelines. Also the SOP for injectionwater system shall address the debris entering into wells during pigging and method to stop thedebris entering into wells shall be developed.

The basic procedure for using Pigs is stipulated below as an outline to develop SOP:

7.1. GENERAL PIGGING ACTIVITIES

The pipelines covered in this EWTIP project shall carry the fluids as below:

Pipe Line Fluid OperatingFlow Ratein m3/hr *

OperatingPressurein Barg *

OperatingTemperature

in degC *

Line Pipe Material

20” SabriyahDistribution Header

InjectionWater

1308278 30-60

Carbon Steel Pipe with internalHDPE lining / Incoloy cladding

20” RaudatainDistribution Header

InjectionWater

1308278 30-60

Carbon Steel Pipe with internalHDPE lining / Incoloy cladding

14” Manifold lines InjectionWater

Max 427.3 -Min 313.3

278 30-60Carbon Steel Pipe with internalHDPE lining / Incoloy cladding


248.4 278 30-60 Carbon Steel Pipe with internalHDPE lining / Incoloy cladding


Max 265.0 -Min 192.1


10” Flow Lines InjectionWater

99.38 278 30-60Carbon Steel Pipe with internalHDPE lining / Incoloy cladding


Max 99.38 -Min 33.13



Max 99.88 -Min 66.25


6” Recovered OilLine

Oily Water31.34 8.41 30-50

Carbon Steel Pipe with internalFBE coating

6” Fuel Gas Line Gas 18326Nm3/hr

25.5 30-50 Carbon Steel internally barePipe

* Note: Flow rate and pressure shall be verified and confirmed before preparation of SOP.




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Doc. No. : 14050642-100-PL-SPC-0002 Date 17.01.2016

For EWTIP project, all metallic pipelines are piggable. Either permanent pig traps or temporary pigtraps are employed for the pigging purpose. The types of pig traps are as below:

Pipe Line From To Pig Trap Type

20” Sabriyah DistributionHeader

EWTIP Sabriyah Field Permanent

20” Raudatain DistributionHeader

EWTIP Raudatain Field Permanent

Manifold lines Distribution Headers Manifolds Temporary

Flow Lines Manifolds Wells Temporary

Recovered Oil Line EWTIP GC-15 & GC-25 Permanent

Fuel Gas Line BS-131 EWTIP Permanent

The Distribution headers shall be equipped with Bi-directional pigging facilities at each end. Otherpipelines shall be equipped with Uni-directional pigging facilities at each end.

Cleaning pig trains shall be displaced at a minimum of 0.3 m/s but not more than 1.0 m/s.

Pig train shall be continuously locatable. The first and last pigs in every pig train shall be fitted withpig locator devices.

Size of pig train shall be determined. Pigging procedure manual in line with 015-IH-1004 and EWTIP-20-PL-SPC-0015 shall be prepared prior to commissioning and approved by the company.

7.2. POST PIGGING CONSIDERATIONS

EPC Contractor ’s commissioning team shall develop procedures (SOP) to allow the followingflushing operations to be carried out in the event of a planned or emergency shut-down. Pipelines

Flushing procedures shall address, as a minimum, availability of flushing medium, availability ofstorage for displaced product, availability of pump capacity.

Pigging facilities shall include a pig handling davit suitable for handling the heaviest operational pigs.

The safe removal, collection and disposal of pig trap contents on completion of each pigging run.This shall include consideration of the potential for toxic, flammable or explosive residues and/ormixtures.

7.3. PIGGING MOTIVE FORCE

The motive force for pigging of the pipelines after commissioning shall be the pipeline contents

itself: Injection Water for water injection pipelines, fuel gas for the Fuel gas pipelines, and Recovery

oil for the Recovery oil pipeline.




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8. PIGGING FREQUENCY

The recommended cleaning / Gauging pigging frequency based on industry experience is one run

during the line commissioning, then after the first year of operation and thereafter every 2 years or

more, depending on cleaning requirement for efficient operation.

A swabbing tool shall be run through each pipeline prior to commissioning. For pipelines with HDPE

liner, Swabbing / scrapping shall be done prior to lining. After lining, only foam pig shall be used.

Only Foam pig shall be used in internal FBE coated recovered oil pipeline.

The summary of pigging frequency during and after Construction (pre-commissioning) is as below:

Pipe Line Pig Type and Frequency

Cleaning Filling / Dewatering /Drying

Gauging

20” Sabriyah

Distribution Header

Type: Metallic circumferential

brush pig.Frequency: Once before hydrotest and HDPE lining.

Type: Bi-Directional pig.

Frequency: For hydro test,as many times as required.

Not applicable

20” RaudatainDistribution Header

Type: Metallic circumferentialbrush pig.Frequency: Once before hydrotest and HDPE lining.

Type: Bi-Directional pig.Frequency: For hydro test,as many times as required.

Not applicable

Manifold lines Type: Metallic circumferentialbrush pig.Frequency: Once before hydrotest and HDPE lining.


Not applicable

Flow Lines Type: Metallic circumferentialbrush pig.Frequency: Once before hydrotest and HDPE lining.


Not applicable

Recovered Oil Line Type: Foam pig. Frequency: Once before hydrotest.

Type: Uni-DirectionalFoam pig.Frequency: For hydro test,as many times as required.

Not applicable

Fuel Gas Line Type: Metallic circumferentialbrush pig.Frequency: Once before hydrotest.

Type: Uni-Directional pig.Frequency: For hydro test,as many times as required. Drying after Hydro test to

be ensured beforecharging line with gas.

Type: Gauging pig.Frequency: Onceafter hydro test.

B

B




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The summary of pigging frequency during operation is as below:

Pipe Line Pig Type and Frequency

Swabbing / Scrapping 20” Sabriyah Distribution Header Type: Foam pig.

Frequency: As applicable during operation.

20” Raudatain Distribution Header Type: Foam pig.Frequency: As applicable during operation.

Manifold lines Type: Foam pig.Frequency: As applicable during operation.

Flow Lines Type: Foam pig.Frequency: As applicable during operation.

Recovered Oil Line Type: Foam pig.Frequency: Monthly / 6 Monthly (Once in 6 months).

Fuel Gas Line Type: Metallic Brush pig.Frequency: Yearly (Once in a year).

9. CONCLUSIONS

The pigging of the EWTIP Project pipelines system considering the considerable number of

pipelines involved will require careful planning. The launch and receive procedures shall require

careful development to ensure maximum safety levels are achieved and maintained. The SOP shall

be prepared considering all these key points and thus act as a governing procedure during pigging.

10. RECOMMENDATIONS

The design of all permanent and temporary pigging facilities shall be as per normal industry

standards and must adhere to all KOC standards and procedures.

Launch and receive facilities shall be designed and fabricated such that corrosion attack from H2S

and other potential corrosive elements is reduced / eliminated.

All permanent and temporary pigging facilities should be suitable for the pressure and fluid type

being handled, which includes both post construction and operational activities.

Detailed operational pigging procedures (SOP) shall be developed by commissioning and operation

team to ensure maximum safety levels are achieved and maintained. All pipeline components shall be suitable for the passage of pigs, including valves, barred tees,

corrosion coupons, transition spools and scraper traps.

B

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14050642 100 PL SPC 0002_Rev B_ Pipeline Pigging Philosophy