Procedure for HAZOP Study:
During each session, the changes required in addition to the safeguards available for deviations resulting in hazardous/ operability
consequences are discussed and noted. Points requiring verification can be obtained from the concerned disciplines. Points requiring action
are noted in HAZOP recommendation sheets.
The technique for hazard and operability study was developed to assess the safety and operability of the plant in a systematic manner.
The typical procedure for HAZOP study is given below
1. Select the node (line, equipment or a system) on the P&ID.
2. List out intention & process parameters for the node.v
3. Apply first guideword.
4. Develop meaningful deviations.
5. Develop various causes of the deviations.
6. Examine consequences of the deviations.
7. Identify safeguards already provided in the system.
8. Suggest remedial actions if required.
9. Repeat step 4-8 for all guide words.
10. Mark node as having HAZOP Software.
11. Repeat step 1-10 for all the nodes.
12. Repeat step 1-11 for all the P&IDs.
13. Finally, the ‘recommendations’ emerging from all the systems studied are compiled for easy reference.
The important terminology of the study is mentioned in the table below:
