managing system integrity of gas pipelines by jegadeesh... · • nace rp –0102 in-line...
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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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The energy lifeline of Gujarat
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
The energy lifeline of Gujarat
.Prevention of Pipeline failure through Integrity
Management System
What happens when disaster
strikes…
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The energy lifeline of Gujarat
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
The energy lifeline of Gujarat
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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The energy lifeline of Gujarat
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)
The energy lifeline of Gujarat
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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The energy lifeline of Gujarat
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
The energy lifeline of Gujarat
Pipeline Integrity Management System
.
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The energy lifeline of Gujarat
Integrity Management Program
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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The energy lifeline of Gujarat
Integrity Management Program
What Can a Risk Assessment Do??
“A risk assessment, no matter what method, it cannot be precise
because risk is not a precise concept.”
The energy lifeline of Gujarat
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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The energy lifeline of Gujarat
Integrity Management
Contd..
PIPELINE THREATS
The energy lifeline of Gujarat
Integrity Management
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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The energy lifeline of Gujarat
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
Integrity Management
Pipeline Threats
The energy lifeline of Gujarat
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
Integrity Management
Pipeline Threats
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The energy lifeline of Gujarat
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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The energy lifeline of Gujarat
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
The energy lifeline of Gujarat
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