QRA for SV- 4G and 4″ LMC Binani Natural Gas pipeline around 30 KM for GAIL, Goa

GAIL (India) Ltd was acknowledged as a Central Public Sector Undertaking (PSU) under the Ministry of Petroleum & Natural Gas (Mo P & NG) in August 1984. GAIL commissioned Dabhol – Bengaluru Natural Gas Pipeline in February 2013, designed to carry a gas volume of 16 MMSCMD (Million Standard Cubic mtrs per day).

The 30.9 Km long 4″ line was commissioned in the year 2019 and is being used to supply gas to M/s Goa Glass Fiber Ltd(GGFL) and M/s GNGPL. At present the cumulative consumption of gas being flown through the pipeline is approximately 30,000 SCMD. The pipeline starts from GAIL SV-04 G station. There is one SV station at chainage 15.0 Km.

Gail (India) Limited has entrusted iFluids Engineering to carry out Quantitative Risk Assessment (QRA) study for the Gail-SV 4G and 4” LMC Binani Natural Gas Pipeline.

The aim of quantitative risk assessment is to evaluate the risk levels for personnel due to unintentional release of hazardous materials due to loss of containment scenarios from the facilities and to analyze and exhibit that individual risks lie within the broadly acceptable regions. The main objective of the study is to evaluate the potential risk levels for personnel due to accidental release of hazardous materials from loss of containment scenarios and to exhibit that individual risks lies within the broadly acceptable region.

The Objectives of QRA are as follows:

  •  To Identify Hazards and Major Loss of Containment (LOC) events.
  • To calculate physical damage and effects of failure case scenarios which include Estimation of Jet Fire, Pool Fire heat radiation distances, Flammable gas dispersion distances, BLEVE and overpressure explosion distances.
  • Failure Frequency evaluation.
  • To quantify societal risk and estimate Potential Loss of Life.
  • To perform risk assessment to confirm that risk can be reduced consistent with the ALARP principle according to the UK HSE risk acceptance criteria.
  • Recommending appropriate measures to reduce risk and ensuring whether all risks are in ALARP or Acceptable region.