GGS Contingency Procedures

/ Petroleum Development Oman LLC / Revision:10.0
Effective: June 13

Petroleum Development Oman L.L.C.

Emergency Response Document

Part III Contingency Plan

Volume 14: Government Gas System

Document ID / PR-1246
Document Type / Procedure
Security / Unrestricted
Discipline / Government Gas Operation
Owner / Government Gas Operation Manager (GGO)
Issue Date / June 2013
Version / 10.0

Keywords: This document is the property of Petroleum Development Oman, LLC. Neither the whole nor any part of this document may be disclosed to others or reproduced, stored in a retrieval system, or transmitted in any form by any means (electronic, mechanical, reprographic recording or otherwise) without prior written consent of the owner.

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Authorised For Issue June, 2013

Version 10.0
June, 2013 / /

Revision Record:

Version No. / Date / Custodian / Scope / Remarks
Rev 6 / June 99 / GGO/2 / Post - Asset Management update
Rev 7 / July 2003 / GGO/1 / Updated to reflect changes in responsibilities due to re-organisation and OGC taking over part of GGS lines. Some changes in Technical content and emergency materials.
Rev 8 / Mar 2006 / GGO/61 / Update to incorporate new changes in the organisation, telephone numbers and add new assets.
Rev 9 / Nov 2008 / GGO/61 / Updated to reflect changes in organisation add new facilities and update telephone numbers.
Rev 10 / June 2013 / GGO/61 / Updated to reflect changes in organisation add new facilities and update telephone numbers.

Reviewed By:

Terminology:

In the documents of the PDO Emergency Response Management System the following words are used to express the level of requirement for actions described within the text:

Shall, Will : Means mandatory. Such actions must be followed

Should : Means strongly recommended

May : Means acceptable and to be considered

Distribution

Target Audience

This document is available in Livelink. If you do not have access to Livelink contact GGO/61 to obtain a copy. The following staff will receive hard copies:

· GGO, GGO/6 & GGO/61

· UIC/4 & UIC

· GGE/3

· LECC’s via Production Co-ordinators

· Corporate Emergency Control Centre (CECC) via UIC

Nominated Government Gas Adviser(s) (GGA)

List of nominated GGA can be obtained from UIC/42.

Contents

1 Introduction 7

1.1 Objectives of the Emergency Response Management System 7

1.2 Purpose of the Document 7

1.3 Scope 7

1.4 Structure of this Document 7

1.5 Document Ownership and Maintenance 8

1.6 Review and Update 8

2 Emergency Procedure 9

2.1 PDO Emergency Response 9

2.1.1 Additional Instructions for GGS Emergencies 9

2.2 Strategy for Gas Pipelines Failures 9

2.3 Area Safeguarding and Access Control 9

2.3.1 Locating the Site of the Leak 9

2.3.2 Gas Testing & Area Isolation 10

2.3.3 Emergency Site Communications 10

2.3.4 Leak Isolation 10

2.3.5 Emergency Equipment 10

2.3.6 Emergency Material 11

2.4 Assessment of Leaks 11

2.5 Stand Down of the Emergency Team 11

2.6 Contingency Scenarios 11

2.6.1 Failure with No Gas Release 11

2.6.2 Failure with Gas Release 12

2.7 Risk Assessment 12

2.7.1 People 12

2.7.2 Environment 12

2.7.3 Assets 12

2.7.4 Supply 13

3 Government Gas System Technical Details 15

3.1 Overview of Government Gas Operations 15

3.2 Assets 15

3.2.1 Pipelines 15

3.2.2 Block Valve Stations (BVS) 16

3.3 Pipeline Technical Data 17

3.3.1 Pipeline Operating Data 17

3.3.2 Distance, vol and max gas content between Block Valve Stations on 48” Pipeline 18

3.4 Gas Consumers 19

3.5 Service Contracts 19

4 Emergency Repairs 23

4.1 System Preparation 23

4.1.1 Line Isolation and Depressurisation 23

4.1.2 Line Degassing 23

4.2 Repair Methods 23

4.2.1 Temporary Repairs 23

4.2.2 Permanent Repairs 24

4.2.3 Hot Tapping and Stoppling 24

4.2.4 Outline Procedure for In Line Block Valve Removal 25

4.2.5 Outline Procedure for In Line Pipe Spool Removal 26

4.2.6 Line Re-Commissioning 28

5 Business Resumption Plan 29

5.1 Introduction 29

5.2 Objectives 29

5.3 Action Plan 29

5.4 Business Resumption Process 30

6 APPENDICES 32

6.1 Abbreviations 32

6.2 Emergency Telephone Numbers GGS 33

6.3 User Feedback 35

Tables and Figures

Table 1: Hazardous Areas vs. Leak Rates 14

Table 2: Gas Pipelines Operating Data 17

Table 3: Volumes between BV’s, 48” QA to Sur Line 18

Table 4: Gas Customers 19

Figure 1: Emergency Demarcation Points 20

Figure 2: Schematic of Gas Distribution System in Oman 21

Figure 4.2.4a Installing Pressure Testing Flange for Inline BV Removal 25

Figure 4.2.4b Install Bypass for Inline BV Removal 26

Figure 4.2.4c Hot Tapping for Inline BV Removal 26

Figure 4.2.4d Removing Inline Block Valve 26

Figure 4.2.5a Bypass Installation for Inline Pipe Spool 27

Figure 4.2.5b Hot Tapping for Inline Pipe Spool 27

Figure 4.2.5c Pipe Cutting for Inline Pipe Spool 27

1 Introduction

1.1 Objectives of the Emergency Response Management System

A prime objective of PDO in emergencies is to ensure that activities are carried out with the following priorities:

· Safeguard Lives. Personnel P

· Protect the Environment. Environment E

· Protect Company or Third Party Assets. Assets A

· Maintain the Company Image/Reputation. Reputation R

Personnel involved in dealing with emergency shall follow these priorities when making decisions and developing action plans.

1.2 Purpose of the Document

This document describes specific response and recovery arrangements for emergencies occurring on the Government-owned, PDO-operated gas pipeline system.

The initial response to emergencies involving Government Gas Assets will be managed by area emergency control teams. This document details actions over and above generic emergency response activities which need to be considered by emergency response personnel when responding to an emergency on the GGS.

1.3 Scope

This manual covers the Government-owned, PDO-operated, gas pipeline system that consists of:

· 48” gas pipeline from Saih-Rawl Central Processing Plant (CPP) to the Liquefied Natural Gas Company (OLNG) in SUR.

· 48” loopline from Saih Nihaydha Gas Plant to Al-kamil BVS-9A

· 10” Al-Kamil Power Plant Spur-line connected from the 48” line near BVS-9.

· 12” OMIFCO and 3” Sur PRT Spurlines.

· 30” Sur IPP Spur line.

· 20” and 36” pipeline from Yibal Government Gas Plant (GGP) to Fahud BVS-2.

· 28” Inter-link Pipeline from Saih-Rawl CPP to Fahud BVS-2.

· 10” and 16” SOGL inter-connector from 48” line to Saih-Nihaydah.

· 36” gas pipeline from Kauther to FHD BVS-2.

1.4 Structure of this Document

This document is designed to be used in conjunction with Part II Company Procedure PR-1065 which details the PDO emergency call out system and generic roles and responsibilities for Area Emergency Control teams. The manual is structured as follows:

· Specific emergency procedures for the Government Gas Pipelines.

· Government Gas Pipeline System Technical Details.

· Emergency Repairs.

· Business Resumption Plan.

This manual does not include the detailed repair for pipelines. Reference should be made to:

Pipeline Emergency Repair Manual GU379.

SP-1210 & SP-1211.

PR-1659

1.5 Document Ownership and Maintenance

Document Owner

Document Owner is the Government Gas Operations Manager [GGO]. GGO is responsible for:

· Approval of the document following review and revision.

· 2 yearly Confirmation to UIC that the plan is still ‘Fit for Purpose’.

· Ensuring the document defines an organisation and identifies resources to enable PDO to adequately respond to identified scenarios.

Document Holder

Document Holder is the Maintenance Support Team Leader GGO/6. GGO/6 is responsible for:

· The technical accuracy of the document.

· Ensuring the update, review and revision of the document is carried out not later than every 2 years and whenever there are significant changes to the company organisation, resources or assets addressed in the document.

Delegation of maintenance and implementation of the document is via a document Custodian.

Document Custodian

The Custodian of this document is the Government Gas Pipeline / Flow line / Static Support Engineer (GGO/61). On behalf of the document holder, GGO/61 is responsible for maintenance and implementation of this document. This includes:

· Ensuring updates are distributed.

· Implementing review and update.

· Planning and executing emergency response exercises.

Related Forms

Users who identify errors, inaccuracies or ambiguities in this document are requested to advise the custodian by returning the Change Control form (Appendix D) and a copy of the relevant page(s) with their comments.

1.6 Review and Update

This document will be reviewed following major changes to the asset, PDO or Government Gas organisations or operations process. Notwithstanding the above, as a minimum it is required that it should be reviewed not later than every two years.

Any proposals for review or revision must be presented to the document custodian GGO/61 and agreed by the document holder GGO/6.

Any user who identifies an inaccuracy, error or ambiguity is requested to notify the custodian so that appropriate action can be taken. The user is requested to return the User Feedback Page, (see Appendix 7.5), fully completed, indicating precisely the amendment(s) required.

2 Emergency Procedure

2.1 PDO Emergency Response

PDO have local emergency control centres (LECC’s) to manage emergencies. For gas pipeline emergencies, the LECC of the area within which the emergency site is located will provide the response to the emergency.

· MaF LECC: Shall respond to emergencies on the 48” pipelines, from BVS-5 to OLNG including the Al-Kamil, OMIFCO, Sur PRT and Sur IPP spur-lines.

· Qarn Alam LECC: Shall respond to emergencies for the 48” pipelines from CPP/ SNGP to and including BVS-5 and SOGL 10” Interconnector, the 28” pipeline up to 28” BVS-2 (Km 66 from CPP).

· Yibal LECC: Shall respond to emergencies for the 20” and 36” pipelines up to and including BVS-1 (Km 29 from GGP) and 36” Kauther pipeline up to and including BVS-1.

· Fahud LECC: Shall respond to emergencies downstream of 20” and 36” BVS-1 to Fahud BVS-2; And downstream of 28” BVS-2 to Fahud BVS-2, and downstream of 36”Kauther line BVS-1 to the receiver end near Fahud BVS-2.

View Figure 1, page 18, for the interfaces.

2.1.1 Additional Instructions for GGS Emergencies

In addition to generic emergency response actions as detailed in Part II Company Procedure PR-1065, the following actions are required to be taken for emergencies involving GGS assets:

· LEBC to inform the duty GGA of the emergency.

· GGA to provide technical support to LEBC.

· gga calls out government gas personnel to assist as required.

· gga notifies consumers if there is any interruption of supply. GGA will be responsible to notify consumers in the Sharqiyah region and OGC for affected OGC supply.

2.2 Strategy for Gas Pipelines Failures

The strategy for a confirmed leak is to stop all input sources of the gas, then isolate the leak by closing the adjacent upstream and downstream block valves.

The public are to be prevented from approaching the area and all ignition sources must be eliminated. When site control is established, recovery, repair and clean-up can proceed.

· Stop gas resources.

· Isolate leaking section.

· Prepare area for safe working.

· Repair leak.

· Resume operation.

· Clean up and restore.

2.3 Area Safeguarding and Access Control

2.3.1 Locating the Site of the Leak

The search team will approach the area of the suspected leak using extreme caution depending on the nature of the leak as follows:

Leak location obvious with ignition; i.e. when ignition has occurred, the search vehicle shall park a safe distance upwind or crosswind from the site of the leak or flame front and approach the leak area with care to try and ascertain the approximate dimension of the leak..

Leak location is obvious but no ignition; then the search team will park upwind or crosswind so that the search vehicle will not enter the gas release envelope. Personnel shall use breathing apparatus and using gas detectors try and establish the approximate edges of the gas cloud at ground level. If practical and but only if deemed safe to do so, an attempt may be made to ascertain the size of the hole in the pipeline.

Leak location not obvious; a search will be undertaken using the following procedures as relevant:

Gas Testing Procedure PR-1154.

Entry into a Confined Space Procedure PR-1148

Note in any doubt about the extent of any gas leak immediately stop vehicles and switch off the engines and proceed on foot donning breathing apparatus and gas detectors.

Detecting the leak will depend upon the size and location of the leak. A large leak from a medium or full line rupture, or a leak which has ignited, will be easy to detect. A small leak from a pinhole or mechanical joint in a remote area could be located during a gas leak detection survey or during routine inspections on the terminals. Leaks will be detected by the sound of gas escaping, disturbance of the ground within the vicinity of a pipeline or by ignition of gas.

The 48” pipeline system has a leak detection system (LDS) installed. Pipeline monitoring is performed by the LDS workstation. Field data is passed from the SCADA system to the LDS which performs calculations and returns the results to the SCADA system.

2.3.2 Gas Testing & Area Isolation

In the event of a leak, the surrounding area must be cordoned off AS SOON AS POSSIBLE with hazard warning tape, signs or whatever other means are available.

The affected area will be tested for the presence of toxic or explosive gas and the boundaries will be assessed for possible ignition sources. Wind direction and speed will be monitored and taken account of in the zone isolation. Gas testing, and atmospheric conditions will continue to be monitored throughout the activity period and the hazard boundaries and restrictions modified accordingly. As a minimum, the surrounding area will be cordoned off in accordance with the Leak Rate Table 1.0