Managing System Integrity of Gas Pipelines - cidm.in by Jegadeesh Nagaraj... · Managing System...

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Managing System Integrity of Gas Pipelines

14th March, 2018 at CIDM

Jegadeesh Nagaraj

Manager (O &M), GSPL

The energy lifeline of Gujarat

�GSPL was set up in 1998 to complement the efforts of GSPC. While GSPC harnesses

and procures natural gas, GSPL is building the infrastructure that transmits the gas

across the state of Gujarat and ultimately allows last-mile linkage to the end-user.

�GSPL is laying a gas grid, to facilitate gas transmission from supply points to

demand centers. Equipped with the latest bi-directional gas transmission

technology to enable two-way gas flow. The network is continuously monitored

using SCADA systems integrated with GIS technology.

�GSPL is India’s second largest natural gas transmission company by network length

operating 2618 kms in Gujarat. First company to start services on common carrier

principle.

�Connected to all major sources like Petronet LNG Dahej, Shell LNG Hazira, Cairn ,

Panna-Mukta-Tapti (PMT), Reliance KG Basin with RGTIL’s East-West Pipeline,

ONGC - same is being delivered to 23 districts in the State.

ABOUT GUJARAT STATE PETRONET LTD

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Natural Gas Pipeline System

.

• Designed for High Pressure Natural Gas Transmission

• Buried(Under ground), Highly Safe for bulk transmission,

Reliable Network

• Every 20~25 Kms

Emergency Isolation and

Remote Operation

• Master Control Room

Monitoring all technical

parameters through SCADA 24X7

• Cathodic Protection to prevent corrosion for under

ground pipeline

• Connecting Gas Source to Demand Centers

Pipeline


.Prevention of Pipeline failure through Integrity

Management System

What happens when disaster

strikes…

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WHAT IS INTEGRITY

.

� The quality of being honest and having strong moral

principles. Doing the right thing even when nobody's

looking. your moral or ethical convictions.

� Persons having integrity means

you are true to yourself and

would do nothing that demeans

or dishonours you.

� FOR PROCESS –

integrity means doing the right thing in a right time and

reliable way

INTEGRITY


What is Integrity Management System ?

“A comprehensive, systematic and integrated

process that includes all the activities that are

required to prevent a failure”

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Background of Integrity Management System

Contd..

• PNGRB (Integrity Management System for Natural Gas

Pipelines) Regulation, 2012 notified No: F. No. Infra /

IM/NGPL /1/2010 dated 05/11/2012.

• ASME B31.8S (Managing System Integrity of Gas Pipelines).

Supplement for ASME 31.8

• NACE RP – 0102 In-Line Inspection of Pipelines

• NACE RP – 0502 External Corrosion Direct Assessment

• NACE SP – 0206 Pipeline Internal Corrosion Direct

Assessment Methodology

Regulation- India

Standards (Non-mandatory)


Integrity Management System

Contd..

a life cycle approach….

It involves all aspects of the Pipeline system

right from Design, Construction, Operation &

Maintenance (O&M) and Integrity

Management.

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Integrity Management Program

•Identifying potential pipeline impact by threat

•Gathering, reviewing and integrating data

•Risk assessment

•Evaluate all threats

•Integrity assessment

•Response to integrity assessment and mitigation


Pipeline Integrity Management System

.

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Integrity Management Program Elements (IMP)

IMP elements

IMP

Plan

Performance

Plan

Communication

Plan

Management of Change

Plan

Quality control

plan

IMP - Process Flow Diagram

Identifying potential Identifying potential Identifying potential Identifying potential

pipeline impact by pipeline impact by pipeline impact by pipeline impact by

threatthreatthreatthreat

Gathering, reviewing, Gathering, reviewing, Gathering, reviewing, Gathering, reviewing,

and integrating dataand integrating dataand integrating dataand integrating data

Risk AssessmentRisk AssessmentRisk AssessmentRisk Assessment

All threats All threats All threats All threats

evaluatedevaluatedevaluatedevaluated

Integrity AssessmentIntegrity AssessmentIntegrity AssessmentIntegrity Assessment

Responses to integrity Responses to integrity Responses to integrity Responses to integrity

assessments and assessments and assessments and assessments and

NONONONO

YESYESYESYES

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What Can a Risk Assessment Do??

“A risk assessment, no matter what method, it cannot be precise

because risk is not a precise concept.”


Risk Identification

Contd..

• RISK = Probability (degree of belief) * Consequences

• Any Pipeline segment the Risk Identification is a MUST

• The Risk can be categorized into three levels:

– Low

– Medium

– High

“A Systematic process in which potential hazards from facility

operation are identified, and the likelihood and consequences of

potential adverse events are estimated”

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Integrity Management

Contd..

PIPELINE THREATS



22 Threats (for 1threat, cause-unkown)

21 threats are divided in 9 Categories and grouped in 3 time

factors

Contd..

Pipeline Threats (ASME31.8S)

I.Time Dependent

1)External Corrosion (EC)

2) Internal Corrosion (IC)

3) Stress Corrosion Cracking (SCC)

II) Stable

4) Manufacturing related threats

- Defective pipe seam welds

- Defective Pipe (Lamination, Hard Spots)

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Contd..

Construction

5) Construction/Welding/Fabrication Threats

-Defective Pipe Girth Weld

-Defective Fabrication Weld

- Wrinkle Bend

- Stripped Threads/Broken Pipe/ Coupling failure

6) Equipment

-Gasket, O-ring Failure

-Control/Relief Valve Failure

- Seal /Pump packing failure

- Miscellaneous


Pipeline Threats


III) Time Independent

7) Third Party / Mechanical Damage

* Damage inflicted by 1st, 2nd, 3rd Parties

* Previously Damaged Pipe

* Vandalism or Terrorism

8) Incorrect Operation

*Incorrect Operational Procedure

9) Weather Related & Outside Force

* Cold Weather

* Lightning

* Heavy Rains or Floods

* Earth Movements


Pipeline Threats

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Pipeline Threats- Assessment Techniques

Contd..

Threats Assessment Methods

Internal

/External

Corrosion

�In-line inspections / Geometry/ Gauging inspections

�Cathodic Protection evaluation - PSP

�PSP ON/OFF Survey

�CIPL / DCVG, CAT Survey

�Peel off Test

�Soil Resistivity assessment

Third Party

Damage

�ROU/ROW details

Location Class, Crossings, HCA, PDI

�Patrolling records

�Identification of High Consequence Areas

Equipment/

Operation

Errors

�Pipeline monitoring -Pressure,Temp.,Flowrate,Flow Velocity, Quality

�In-line inspections / Geometry/ Gauging inspections

�Pipe Thickness records

�Equipment breakdown records

�Gas leakage/ Failure records

�Subsurface gas detection survey

�Depth /Dig Verification Survey

Under ground pipe

DC

Power

Coating Damage

Series of Anodes (auxiliary structure)

+ -

Underground

Above ground

Soil

T/R Unit

Coating

BASIC CP INSTALLATION & ITS WORKING

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Pipeline Threats- Major Assessment Techniques

Contd..

• In-line inspections / Geometry/ Gauging

inspections Video Clip

• Coating integrity survey (CIPL / DCVG & CAT

Survey)

• Stress corrosion cracking study Video clip

• Corrosion Coupons

• Regular aerial & Foot patrolling

• Cathodic Protection monitoring


It is very important to have a good pipeline design,

well supervised construction and professionally

managed Operation & Maintenance to have a better

results of IMP

Contd..

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THANK YOU

THANK YOU

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