What is Hazard Study 2?

A hazard study 2 (HazID) aims to identify the main process safety hazards in the process and ensures that appropriate safeguards have been put in place. It asks questions like:

• Is it possible to have a fire/explosion? And what could be the causes of that?
• Could we overfill one of our tanks?, and if so, what would the consequences be?
• Are there any situations which could result in an overpressure?
• Could we expose our operators to toxic substances?

The main difference between HS2 and HazOp (HS3) is that HS2 uses a “top-down” approach, whereas HazOp uses a “bottom-up” approach. HS2 also requires less detailed design information than HS3, and takes less time to do. Carrying out a HS2 saves time and money for the project by hopefully identifying any serious issues before the design has progressed too far. To get the best value from HS2, it should be carried out once process flow diagrams (PFDs) are available, but before full piping & instrumentation diagrams (P&IDs) have been produced. Sufficient time should be allowed in the project program to allow actions raised at HS2 to be completed before the design is frozen for HazOp.

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