Quantitative Risk Assessment is a technique used to systematically calculate the risks from hazardous events. It involves predicting the size of consequences associated with a hazard, and the frequency at which a release of the hazard may be expected to occur. These aspects are then combined in order to obtain numerical values for risk – usually risk of fatality.
Hazard and Operability (HAZOP) Study is a technique to evaluate the potential hazards which are associated with the Existing facilities and for proposed new facilities of Operation and Maintenance. This study is carried out by a team of engineers from different disciplines. The team looks at each section of a plant or system or operation, considers potential hazards from intended operation and analyses their consequences against any existing safeguards.
M/s Hindustan Petroleum Corporation Limited has a Bulk Marketing cum Tap off point Oil at HPCL Cassimode Depot. The terminal handles FO, Bitumen products.
At Terminal, the operating process is receipt of FO, Bitumen their Storage in respective storage Tanks & then dispatch to market through Distributers. The products are distributed to market through Tank Trucks.
Risk Assessment study for HPCL Cassimode BOT terminal included the following steps.
- Identification of Hazards (Fire / Explosion uncontrolled release of Hazardous material / Flash Fire / Jet Fire / Over Pressure Explosion etc.)
- Identification of Maximum Credible Accident (MCA) scenario.
- Frequency Analysis using internationally accepted database and Evaluation of the -likelihood of occurrence of possible events.
- Consequence modelling and analysis for the identified hazard covering impact on people and potential escalation
- Estimation of Individual Risk(IR) and Societal Risk (SR)
- Identify the hazards inherent to the proposal.
- Identify the credible human and/or equipment instrument failures likely to lead to accident scenarios/Operability Problems.
- Qualitatively assess the risk and provide recommendations to overcome the hazards if required.
- In addition to these issues, HAZOP identifies items which could improve unit operations and efficiency