HAZOP meeting and 30% Model Review
HAZOP meeting and 30% Model Review
(OP)
Dear Engineers
Please kindly be informed that our project is Gas treating and sweetening Plant.
In our Contract with client , 30% 3D model review (in PDMS) is the precedence of "HAZOP" study meeting but I can not understand any relation between HAZOP and 30% of 3D Model review meeting. According to your opinion why we can not execute HAZOP study before the said meeting?
P.S. For your information we have three meetings in our project regarding 3D ( 30% , 60% and 90% model review)
Please kindly be informed that our project is Gas treating and sweetening Plant.
In our Contract with client , 30% 3D model review (in PDMS) is the precedence of "HAZOP" study meeting but I can not understand any relation between HAZOP and 30% of 3D Model review meeting. According to your opinion why we can not execute HAZOP study before the said meeting?
P.S. For your information we have three meetings in our project regarding 3D ( 30% , 60% and 90% model review)





RE: HAZOP meeting and 30% Model Review
On the other hand if you can argue that this is not the case and that moving up the HAZOP will be a benefit then why should the client object?
Best regards
Morten
RE: HAZOP meeting and 30% Model Review
RE: HAZOP meeting and 30% Model Review
Best regards
Morten
RE: HAZOP meeting and 30% Model Review
HAZOP at www.curryhydrocarbons.ca
RE: HAZOP meeting and 30% Model Review
I know that HAZOP shall perform after reaching P&ID to the proper quality but what is the relation between HAZOP and 3D modeling. Our client insist to perform 30% model review before performing the HAZOP study.
RE: HAZOP meeting and 30% Model Review
Best regards
Morten
RE: HAZOP meeting and 30% Model Review
The HAZOP study should preferably be carried out as early in the design phase as possible - to have influence on the design.
On the other hand; to carry out a HAZOP we need a rather complete design. As a compromise, the HAZOP is usually carried out as a final check when the detailed design has been completed.
lm
RE: HAZOP meeting and 30% Model Review
RE: HAZOP meeting and 30% Model Review
Best regards
Morten
RE: HAZOP meeting and 30% Model Review
RE: HAZOP meeting and 30% Model Review
We are going through a project doing hazard studies at 25% design and beyond becuase we are late and unresourced. It is horrible managing actions and making changes at 25% pipework modelling. The EPC hates it and so do we. But , we are making a few observations from the modelling and equipment size that need management.
Good project management would have you completed HAZOP and possibly a QRA or HAZAN, Process hazard REVIEW (IEC61508) type review after FEEP/FEP. When detailed design starts ideally you should only be implementing the study actions.
There is no point doing a study unless you plan to manage the actions but at the stage of you are at. Change should be difficult by having robust change management and cost control.
RE: HAZOP meeting and 30% Model Review
I believe that 30% model review prior to the HAZOP study is an arbitrary goal that your contractor set and has little to do with reasoning. It mostly reflects contractor philosophy.
Purely from an economic perspective, I would like to share my experiences with you. I have facilitated HAZOP studies prior and after the first model review. Here are my thoughts:
HAZOP Study conducted prior to first model review:
PROS - Shorter model review duration, reduced man hours. Model review can focus on 3D shortcomings of the unit instead of process upsets/hazards due to poor design parameters (i.e. lack of safeguards, MAWP/T) - assuming that such issues would be covered in the HAZOP study
CONS - P&IDs lacking detailed information regarding safety features. Increased number of action items, resulting in more man-hours close out with proper documentation. Increased HAZOP session duration.
HAZOP Study conducted after the first model review:
PROS - Shorter HAZOP review session duration.
CONS - I can't really think of any...
I hope this was helpful. I believe that the main point is that the initial HAZOP study should be performed either immediately prior to or shortly after the 30% review to reduce the man-hours associated with follow-up.