Quantitative Risk Assessment Study Of SV Station

The Dabhol – Bangalore Natural Gas pipeline is running from Dabhol, Maharashtra to Bangalore, Karnataka and it is owned by GAIL (India) Limited.  An 18” Tap-off is taken from 30” mainline in Bangalore. The Spur line is of 72.9 km in length. GAIL India Limited want to carry out QRA study for SV station in the Spur line.

The main objective of this study is to evaluate the potential risk levels for personnel due to accidental release of hazardous materials from loss of containment scenarios from the facilities and to demonstrate that individual risks are within the broadly acceptable regions. The Objectives of QRA are as follows:

  • Identification of the Hazards involved and possible failure scenarios for SV station.
  • Calculation of physical effects of failure case scenarios which include Estimation of Jet Fire, Pool Fire heat radiation distances, Flammable gas dispersion distances, and overpressure explosion distances.
  • Failure Frequency evaluation.
  • Societal risk quantification and Potential Loss of Life estimation.
  • Perform a risk assessment to confirm that risk can be reduced consistent with the ALARP principle according to the UK HSE risk acceptance criteria.
  • Recommend risk reducing measures such as Prevention, Detection, Control, Mitigation and Emergency response to ensure that all risks are in ALARP or in Acceptable region.

Risk is the general measure of potential economic loss or human injury in terms of the probability of the loss or injury occurring and magnitude of the loss or injury if it occurs. Risk thus comprises of two variables; magnitude of consequences and the probability of occurrence. The hazards and consideration arises from its tolerability to personnel, the facility and the environment. This involves the identification of initiating events, possible accident sequences and likelihood of occurrence and assessment of the consequences. This study tries to quantify the risks to rank them accordingly based on their severity and probability.