Review P&ID with a microscopic view:

To review P&ID with a microscopic view involves a thought process that calls to review P&ID with your eyes, ears, and brain open.

(My suggestion to drink a cup of coffee before going for an in-depth analysis of your P&ID that’s in your hand, and to keep your phone aside for a while. Didn’t like my suggestion you are free to opt-out  )

Note:

1.    Start with one piece of equipment at a time.

2.    Justify P&ID in all sense with – IMSO

Installation, Maintenance, Safety, Operation.

Let’s take an example: Review a part of a P&ID:

A Vessel.

Here’s how you can start:

●     Installation:

1.    All hardware in place?

2.    All connections appropriate? Verify with PFD, for major equipment connection.

3.    Appropriate nozzle allocated for inlet and outlet?

4.    Are spectacle blinds in place?

●     Maintenance:

1.    Vent and Drain line in place?

2.    Isolation Valves in place?

3.    Bypass line wherever necessary?

4.    Does it require Manhole or a Handhole for cleaning and maintenance, if yes, then is it indicated?

●     Safety:

1.    Does this vessel need a PSV? If yes, is it shown and indicated as per the terminology?

2.    Verify control loops are in a place where necessary.

3.    Does it require Overflow line or Blanketing line?

4.    If there’s a minimum recirculation line from discharge pump, does it show appropriately?

●     Operation:

1.    All set? Can you take water trial without any problem?

2.    Can you take a chemical trial or process run, will it be safe and smooth run?

3.    Valves are tagged with appropriate “NO” or “NC” (Normally Open/Closed).

4.    Instruments in place? Are they indicating location, whether or not accessible to the operator and so forth?

Any ambiguity must be clarified instead of assuming something. This guide post is just a tip of the iceberg. A lot goes beyond saying and writing, when one review P&ID.