When the HAZOP study has to be updated or reviewed on which bases?

HAZOP is a Hazard & Operability study carried during conceptual and various designing stages of a project. HAZOP study need to be updated or reviewed again whenever there is a change in the design or process at any stage of the project  

HAZOP STUDY SHALL BE DONE BEFORE COMMISSIONING

AFTER COMMISSIONING EVERY 5 YEARS

Retrospective hazop to be performed after every 5 years irrespective of any major change in plant or process. HZAOP  is critical Tier-1 documents has to be updated after every 5 years to ensure plant/process integrity is compromized.

HAZOP Stands for Hazard and Operability studies. All the Hazop study recommendations needs to be suitably closed and Issue the HAZOP Close-out report. If required Assessment of Hazop close-out study need to be performed before the Mechanical Completion/Provisional Turn over.

Once any process changes require.

Depend on the country every 5 years for critical process and 10 for non critical process

 HAZOP study need to be updated or reviewed again whenever there is a change in the design or process at any stage of the project. Usually outcome of the HAZOP study is to be updated before design and engineering issues are finalized.

HAZOP normally carried out after P&ID is issued for the IFC, so that the comments which are justifiable regarding the safe aspect shall be incorporated to reduce the major comment during the HAZOP and Safe design.

If there is a plan to introduce new equipment into operating facilities. Assessments must be completed to show potential risks or inadvertent possibilities with the introduction of this new equipment.

Hazop study is to be updated or reviewed whenever there is a change or modification in the design, process conditions, equipment, raw material and procedures.

When there are changes or modifications to equipment, procedures, raw materials, and processing conditions other than "replacement in kind."

For example, the operating procedures contain the operating paramaters (pressure limits, temperature ranges, flow rates, etc.) and the importance of operating within these limits. While the operator must have the flexibility to maintain safe operation within the established parameters, any operation outside of these parameters will result from changes in production rates which then requires review and update of the HAZOP studies with approval by a written management of change procedure.

depends on process circumestances