GAIL (India) Limited is a Central Public Sector under the Ministry of Petroleum & Natural Gas (MoPNG), Government of India. GAIL operates a network of Natural Gas Pipelines of about 11000 Km & LPG Pipeline network of about 2000 Km.
Presently GAIL – KG Basin, Andhra Pradesh, operates nearly 900 KM of Natural Gas Pipe Line Network and GAIL intends iFluids Engineering to carry out Complete Risk assessment of 900 KM Natural Gas Pipeline Network and Terminals in line with PNGRB Regulations & ASME B31.8S :2016, OISD Standard & IEC 31010.
Pipeline Research Committee International (PRCI) / PNGRB guidelines represents 22 root causes for threat to pipeline integrity. One of the causes reported by the operator is “unknown”. The remaining 21 threats have been classified into three groups based on time dependency and further in to nine categories of related failure types according to their nature and growth characteristic as below:
Time Dependant threats
- External Corrosion
- Internal Corrosion [Internal corrosion due to off spec. gas, as per Petroleum and Natural Gas Regulatory Board (Access Code for Common Carrier or Contract Carrier Natural gas pipelines) Regulations, 2008, also to be considered]
- Stress Corrosion Cracking
Stable threats
- Manufacturing related defects
- Defective pipe seam
- Defective pipe
- Welding/ fabrication related
- Defective pipe girth weld
- Defective fabrication weld
- Wrinkle bend or buckle
- Stripped threads / broken pipe / Coupling failure
- Equipment
- Gasket O-ring failure
- Control / relief equipment malfunction
- Seal pump packing failure
- Miscellaneous
Time independent threats:
- Third party / mechanical damage:
- Damage inflicted by first, second or third party (instantaneous / immediate failure)
- Previously damaged pipe (delayed failure mode)
- Vandalism
- Incorrect Operational procedure
- Weather related and outside force
- Weather related
- Lightening
- Heavy rains or floods
- Earth movements
Scope Of Work
- The risk assessment shall be carried out for below installations such as
- Pipe Lines
- Receipt / Despatch Terminals
- SV Stations
- IP Stations in the jurisdiction of 5 Maintenance Base Stations spreading in three districts of Andhra Pradesh
- Risk assessment for pipelines shall be conducted to identify the location-specific events or conditions, or combination of events and conditions that could lead to loss of pipeline integrity, and provides an understanding of the likelihood and consequences of these events.
- Risk assessment shall be carried out for pipeline installations such as Sensationalizing Valve stations (SVs) / Intermediate Pigging stations (IPs) / Dispatch / Receiving Terminals.
- A Full Scale Initial Risk Assessment of KG Basin Pipe Line Network During the First Year.
- The Risk assessment of all the KG Basin Pipe Line Sections shall be done in line with PNGRB Regulations 2012 and ASME B 31.8S
- Review of Risk Assessment done after one year of completion of the Initial Risk assessment for updating I incorporating any new risks identified due to changes in Pipe Line System or its environment and submission of Updated Risk assessment considering the major pipeline integrity jobs carried out in the last year.
- Review of updated Risk assessment done after Second year of completion for updating I incorporating any new risks identified due to changes in Pipe Line System or its environment considering the major pipeline integrity jobs carried out in the last year.
- Risk assessment training to be provided for GAIL officials for making the required changes in the Pipe Line Network during the Initial, and Subsequent risk assessment phases
- Full-scale Risk Assessment shall be conducted in the first & subsequent years, the assessment done during the first year shall be updated for any changes those might have occurred in the pipeline system or its environment.
Software Used
PHAST SAFETI 8.4
Standards & Regulations
- Petroleum and Natural Gas Regulatory Board (Integrity Management System for Natural gas pipelines) Regulations, 2012
- ASME B31.8S (Latest Version): Managing System Integrity of Gas Pipelines
- ISO / IEC 31010:2009 – Risk Management – Risk assessment Techniques
- Applicable OISD standards
Project Duration
The duration of the Project is 03 years
Deliverables
- Soft copy of all formats used in Risk Assessment Models to be submitted.
- Preparation & Submission of Reports