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Hazid, Hazop, Lopa & Sil Study - Process Engineering Design

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#1 ponraj_btech@yahoo.coom


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Posted 27 May 2016 - 08:43 PM

Dear Sirs,
I have knowledge on HAZOP but not able to relate other process safety studies like HAZID, LOPA & SIL.
1) I am not sure when these will be done (FEED or EPC) and in which order?
2) Please guide the basis for these studies - HAZID, LOPA & SIL
3) I know for HAZOP process engineers are responsible for closing most of the action items. Is there any such thing in HAZID, LOPA & SIL studies and who is responsible to close action items (process, instrumentation, safety)?
Please guide me. 
Many Thanks

#2 Kiran T

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Posted 28 May 2016 - 03:11 AM


Hope this will help you.





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Posted 03 June 2016 - 11:06 AM

Dear Ponraj

1. Please take note that HAZID and HAZOPS are the recommended method for HAZARDS Identification while LOPA and SIL are RISK assessment tools.

2. You can use HAZIDS or HAZOPS depending on the experience level members of the team.

2. My experience so far indicates that HAZOPS is good enough.

3. LOPA and SIL normally carried out upon recommendation by the HAZOPS team whenever the team members found that the recommended layer of protection is not good enough therefore risk will provide the justification for additional layer of protection.


Hope the above comment helps.



#4 ieseberri


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Posted 19 September 2017 - 05:07 AM

Hope this help also!



Edited by ieseberri, 19 September 2017 - 05:09 AM.

#5 sheiko


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Posted 20 September 2017 - 11:00 PM


HAZID is sometimes called PHA (Preliminary Hazard Analysis) and should be performed before HAZOP.
It deals with non-process hazards such as: plot, construction, maintenance, production, environment, people safety, fire protection interfaces, etc... and can be performed during Basic or FEED studies. It is a kind of brainstorming using a standard checklist.

On the other hand, HAZOP is best Performed during detailed design and deals with process Hazards only (including start-up, shutdown and normal operations).

Edited by sheiko, 20 September 2017 - 11:09 PM.

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