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Managing System Integrity of Gas Pipelines Jegadeesh Nagaraj - PDF document

19-03-2018 Managing System Integrity of Gas Pipelines Jegadeesh Nagaraj Manager (O &M), GSPL 14 th March, 2018 at CIDM ABOUT GUJARAT STATE PETRONET LTD GSPL was set up in 1998 to complement the efforts of GSPC. While GSPC harnesses and


  1. 19-03-2018 Managing System Integrity of Gas Pipelines Jegadeesh Nagaraj Manager (O &M), GSPL 14 th March, 2018 at CIDM ABOUT GUJARAT STATE PETRONET LTD � 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. ���������������������� ������� 1

  2. 19-03-2018 Natural Gas Pipeline System Pipeline � • 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 ���������������������� ������� � Prevention of Pipeline failure through Integrity Management System What happens when disaster strikes… ���������������������� ������� 2

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  4. 19-03-2018 WHAT IS INTEGRITY 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 ���������������������� ������� What is Integrity Management System ? “A comprehensive, systematic and integrated process that includes all the activities that are required to prevent a failure” ���������������������� ������� 4

  5. 19-03-2018 Background of Integrity Management System Regulation- India • PNGRB ( Integrity Management System for Natural Gas Pipelines) Regulation, 2012 notified No: F. No. Infra / IM/NGPL /1/2010 dated 05/11/2012. Standards (Non-mandatory) • 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 Contd.. ���������������������� ������� Integrity Management System a life cycle approach…. It involves all aspects of the Pipeline system right from Design, Construction, Operation & Maintenance (O&M) and Integrity Management . Contd.. ���������������������� ������� 5

  6. 19-03-2018 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 � ���������������������� ������� 6

  7. 19-03-2018 Integrity Management Program Integrity Management Program Elements (IMP) IMP elements Management of Quality IMP Performance Communication Change control Plan Plan Plan plan Plan ���������������������� ������� IMP - Process Flow Diagram ���������������������� ���������������������� ���������������������� ���������������������� ���������������������� ���������������������� ���������������������� ���������������������� ������������������� ������������������� ������������������� ������������������� �������������������� �������������������� �������������������� �������������������� ������ ������ ������ ������ ��������������� ��������������� ��������������� ��������������� �� �� �� �� ������������ ������������ ������������ ������������ ��������� ��������� ��������� ��������� � ! � ! � ! � ! �������������������� �������������������� �������������������� �������������������� ����������������������� ����������������������� ����������������������� ����������������������� ���������������� ���������������� ���������������� ���������������� 7

  8. 19-03-2018 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.” ���������������������� ������� Risk Identification “A Systematic process in which potential hazards from facility operation are identified, and the likelihood and consequences of potential adverse events are estimated” • 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 Contd.. ���������������������� ������� 8

  9. 19-03-2018 Integrity Management PIPELINE THREATS Contd.. ���������������������� ������� Integrity Management Pipeline Threats (ASME31.8S) 22 Threats (for 1threat, cause-unkown) 21 threats are divided in 9 Categories and grouped in 3 time factors 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) Contd.. ���������������������� ������� 9

  10. 19-03-2018 Integrity Management Pipeline Threats 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 Contd.. ���������������������� ������� Integrity Management Pipeline Threats III ) Time Independent 7) Third Party / Mechanical Damage * Damage inflicted by 1 st , 2 nd , 3 rd 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 ���������������������� ������� 10

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