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Reviewing P&IDs and process safety

  • 1.  Reviewing P&IDs and process safety

    Posted 08-14-2019 11:46
    As a process engineer, I have to review P&IDs for the project I am working on. Sometimes process safety with addition of few safety critical equipment is taken as a gold plating. It is my practice that, one should keep safety window open during design reviews. What are your thoughts on this?

    Ali Qayum
    Project Engineer - Process & Performance
    Lahore Gpo

  • 2.  RE: Reviewing P&IDs and process safety

    Posted 08-16-2019 09:27
    During any project, there should be a step in which process safety is assessed (i.e. HAZOP or PSM) analysis.  To have a good review, you need a good set of P&IDs in order to have those sessions.  As a process engineer, you create an accurate P&ID as much as possible using best practices and experience.  But the process engineer doesn't have all of the responsibility.....the project team has.  This way, you always have more than one brain assessing and building the P&IDS (which is always better than just one brain).  Focus on data and facts, and try to keep the emotions out of the decision process.  As professional engineers, we have an obligation to try and make processes that we help design for the best of the company as well as the community.  There will always be a balance between process safety and financial constraints.  It is all about managing relative risks using data and facts (not opinions and emotions).  Having said all of that, if you truly know that there is a fundamental safety issue that isn't being addressed to your satisfaction, then don't sign the P&IDs.  In Canada, we are part of a professional engineering society that we (as professional engineers) are legally held responsible for the decisions we make.    Our obligation to the safety of the public and community out weights the client or company you work for.  ​In well developed teams, some conflict is good.....and I am sure that there are always a way to address safety issues wrt P&ID develop for the team's, client's, company's, and community's best interests.

    John Howell PE
    Senior Process Engineer
    Fredericton NB

  • 3.  RE: Reviewing P&IDs and process safety

    Posted 08-17-2019 01:19
    John, you deliberation on Development of P&ID and Associated safety  issues for a specific facility is something interesting and important too, for the project owner/Manager and the asset owner. The following actions/activities seems useful to contain the project cost and deliver the asset as intended to be operated safely. 

    1. All reviewers should have a check list to focus in his/her respective area aligning the projects scope and design intent/scope. 
    2. Asset owner should know his risk appetite to set parameters in Risk diagram and QRA 
    3. Safety review on P&ID in few stages, besides HAZOP/HAZID etc
    4. 3D model review, Constructability review and safety review - done as an individual event and jointly on a common platform. 
    5. Post start-up safety review to close all project query based punch points raised.   

    Lastly, but not the least, I do agree that the involvement of professional Engineers/Managers from all disciplines is critical in decision making.         

    Tushar Poddar

  • 4.  RE: Reviewing P&IDs and process safety

    Posted 08-25-2019 09:08
    Hi Ali

    If you are working as safety in design, usually typical workflow for reviewing P&IDs from engineering team is when Management of Change (MoC) submitted, as safety engineer (process safety/risk engineer/loss prevention engineer) you should be able to review the potential hazard if any changes i.e modification, implementation, installation (it is applicable if the MoC is not in same specification with existing, if same specification MoC is not mandatory to use).

    My suggestion if you are incharge as safety engineer as above, urgent matters you should consider to review the P&ID:
    - Use your company HAZOP guidewords for determining the deviations i.e No Flow, Low Flow, High Flow etc
    - Marking the P&ID line with marker, it is really matters to determine your scope of work for conducting HAZOP
    - Use your company risk assessment form and follow the best practice i.e CCPS, IOGP etc

    Muhammad Shidqi