14050642 100 PL SPC 0002_Rev B_ Pipeline Pigging Philosophy

EFFLUENT WATER TREATMENT AND INJECTION PLANT (NK) Project No. EF/1761 CONTRACT NO. 14050642 PIPELINE PIGGING PHILOSOPHY Doc. No. : 14050642-100-PL-SPC-0002

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Page Rev Date

1 of 20 B 17.01.2016

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)

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 By

Approved By

EFFLUENT WATER TREATMENT AND INJECTION PLANT (NK) Project No. EF/1761 Class 1

CONTRACT NO. 14050642 PIPELINE PIGGING PHILOSOPHY Doc. No. : 14050642-100-PL-SPC-0002

Page Rev Date

2 of 20 B 17.01.2016

REVISION RECORD: Revision No. A B

Reason for Revision

Date

Issued For Approval

22.07.2015

Re-Issued For Approval

17.01.2016


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PAGE INDEX Page B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

X X X

X X

C

D

1

Revision 2 3

Page B

C

D

1

Revision 2 3

3 of 20 B 17.01.2016



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4 of 20 B 17.01.2016

TABLE OF CONTENTS ……………………………………………………………………………….. 5

1.

PROJECT DESCRIPTION

2.

PURPOSE OF THE DOCUMENT

3.

TERMINOLOGY

4.

REFERENCES, CODES, STANDARDS AND SPECIFICATIONS

5.

OVERVIEW OF PIPELINE PIGGING ……………………………………………………………………… 10

6.

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

7.

PIGGING PLAN AND CONSIDERATIONS

8.

PIGGING FREQUENCY

9.

CONCLUSIONS

10.

RECOMMENDATIONS

………………………………………………………………….….. 6

…………………………………………………………………………………..…….. 6 ……………………………….. 8

……………………………………………………………. 17

……………………………………………………………………………….. 19

…………………………………………………………………………………………. 20 ……………………………………………………………………………….. 20


1.


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5 of 20 B 17.01.2016

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-25 (200 MBWPD normal; 220 MBWPD design) • GC-23 (150 MBWPD normal; 165 MBWPD design) • GC-24 (200 MBWPD normal; 220 MBWPD design) • GC-29 (240 MBWPD design) • GC-30 (240 MBWPD design) • GC-31 (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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6 of 20 B 17.01.2016

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 related pigging 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

CONTRACTOR

Kuwait Oil Company (K.S.C) EPC 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

SHALL

SHOULD

The word “SHALL” is understood to be mandatory to comply with the requirements. 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

7 of 20 B 17.01.2016


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4.

Page Rev Date

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

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REFERENCES, CODES, STANDARDS AND SPECIFICATIONS KOC performs pigging activities based on its specification 015-IH-1004. Thus this philosophy is in compliance 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

Page Rev Date

9 of 20 B 17.01.2016

-

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



KOC-MP-005

-

Standard for Pipeline Pig Trap Systems



KOC-MS-002

-

Induction Bends



KOC-MS-001, PART 1 -

-

Pipeline Dewatering, Drying and Purging

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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OVERVIEW OF PIPELINE PIGGING

5.1. GENERAL This pigging philosophy assess the minimum requirements of pigging activities that consist of postconstruction 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. B  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. B 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 (gauging Pigs). 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.


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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.



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5.4. TYPES OF PIGS 5.4.1. Gauging Pig

B

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 bidirectional 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 bidirectional pigs. 5.4.6. Circumferential Brush Pig

The circumferential brush pig is similar to a regular brush pig, but its cleaning brushes are nonsegmented 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 operation requiring 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


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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, to be run during pre-commissioning or ahead of an inspection pig to check for obstructions.

B 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. 2. 3. 4.

Cleaning, gauging, hydrostatic test filling and dewatering during commissioning. Wax, asphaltenes, rust and scale removal in liquid lines. Separated water phase removal in liquid lines. 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.


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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. Straight runs 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) 20 14 12 10 8 6

Transported product Injection Water Injection Water Injection Water Injection Water Injection Water Injection Water / Recovered Oil / Fuel Gas

Cleaning pig weight (Kg) 54 – 67 Kgs 16 – 19 Kgs 15 – 17 Kgs 13 – 15 Kgs 8 – 9 Kgs 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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17 of 20 B 17.01.2016

PIGGING PLAN AND CONSIDERATIONS In order to operate this EWTIP project pipeline systems effectively, the inside of the pipeline has to be 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 to suggest type of pig, pigging frequency, pigging velocity & pressure drop during pigging, flow rate to be 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 for this pipe line. As well, a separate SOP shall be prepared for FG pipelines. Also the SOP for injection water system shall address the debris entering into wells during pigging and method to stop the debris 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

20” Sabriyah Distribution Header 20” Raudatain Distribution Header 14” Manifold lines

Injection Water Injection Water Injection Water Injection Water Injection Water Injection Water Injection Water Injection Water Oily Water

Operating Flow Rate in m3/hr * 1308

Operating Pressure in Barg *

Operating Temperature in degC *

Line Pipe Material

Carbon Steel Pipe with internal HDPE lining / Incoloy cladding Carbon Steel Pipe with internal 1308 278 30-60 HDPE lining / Incoloy cladding Carbon Steel Pipe with internal Max 427.3 278 30-60 HDPE lining / Incoloy cladding Min 313.3 12” Manifold lines Carbon Steel Pipe with internal 248.4 278 30-60 HDPE lining / Incoloy cladding 10” Manifold lines Carbon Steel Pipe with internal Max 265.0 278 30-60 HDPE lining / Incoloy cladding Min 192.1 10” Flow Lines Carbon Steel Pipe with internal 99.38 278 30-60 HDPE lining / Incoloy cladding 8” Flow Lines Max 99.38 Carbon Steel Pipe with internal 278 30-60 Min 33.13 HDPE lining / Incoloy cladding 6” Flow Lines Max 99.88 Carbon Steel Pipe with internal 278 30-60 Min 66.25 HDPE lining / Incoloy cladding 6” Recovered Oil Carbon Steel Pipe with internal 31.34 8.41 30-50 Line FBE coating 6” Fuel Gas Line Gas 18326 Carbon Steel internally bare 25.5 30-50 Nm3/hr Pipe * Note: Flow rate and pressure shall be verified and confirmed before preparation of SOP. 278

30-60


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

Pipe Line 20” Sabriyah Distribution Header 20” Raudatain Distribution Header Manifold lines Flow Lines Recovered Oil Line Fuel Gas Line

From EWTIP

To Sabriyah Field

Pig Trap Type Permanent

EWTIP

Raudatain Field

Permanent

Distribution Headers

Manifolds

Temporary

Manifolds EWTIP BS-131

Wells GC-15 & GC-25 EWTIP

Temporary Permanent Permanent



The Distribution headers shall be equipped with Bi-directional pigging facilities at each end. Other pipelines 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 with pig locator devices.



Size of pig train shall be determined. Pigging procedure manual in line with 015-IH-1004 and EWTIP20-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 following flushing 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 of storage 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/or mixtures.

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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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.

B

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

Pipe Line

20” Sabriyah Distribution Header

20” Raudatain Distribution Header

Manifold lines

Flow Lines

Recovered Oil Line

Fuel Gas Line

Pig Type and Frequency Cleaning Filling / Dewatering / Drying Type: Metallic circumferential Type: Bi-Directional pig. brush pig. Frequency: For hydro test, Frequency: Once before hydro as many times as required. test and HDPE lining. Type: Metallic circumferential Type: Bi-Directional pig. brush pig. Frequency: For hydro test, Frequency: Once before hydro as many times as required. test and HDPE lining. Type: Metallic circumferential Type: Bi-Directional pig. brush pig. Frequency: For hydro test, Frequency: Once before hydro as many times as required. test and HDPE lining. Type: Metallic circumferential Type: Bi-Directional pig. brush pig. Frequency: For hydro test, Frequency: Once before hydro as many times as required. test and HDPE lining. Type: Foam pig. Type: Uni-Directional Frequency: Once before hydro Foam pig. test. Frequency: For hydro test, as many times as required. Type: Metallic circumferential Type: Uni-Directional pig. brush pig. Frequency: For hydro test, Frequency: Once before hydro as many times as required. test. Drying after Hydro test to be ensured before charging line with gas.

B Gauging Not applicable

Not applicable

Not applicable

Not applicable

Not applicable

Type: Gauging pig. Frequency: Once after hydro test.


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The summary of pigging frequency during operation is as below:

Pipe Line 20” Sabriyah Distribution Header 20” Raudatain Distribution Header

Manifold lines Flow Lines Recovered Oil Line Fuel Gas Line

9.

Pig Type and Frequency Swabbing / Scrapping Type: Foam pig. Frequency: As applicable during operation.

B

Type: Foam pig. Frequency: As applicable during operation. Type: Foam pig. Frequency: As applicable during operation. Type: Foam pig. Frequency: As applicable during operation. Type: Foam pig. Frequency: Monthly / 6 Monthly (Once in 6 months). Type: Metallic Brush pig. Frequency: Yearly (Once in a year).

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.

14050642 100 PL SPC 0002_Rev B_ Pipeline Pigging Philosophy

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