I'm in a position now where I'm reviewing P&ID's for vendor-supplied equipment.  In the past I've been in Operations where I merely updated these types of drawings.

I was wondering if you all would be able to provide some general guidelines as to any sort of procedure you use to review the drawings, and the things you ask yourself/look for while reviewing.

On the surface this probably seems like a stupid question, and perhaps it is, but I tend to like to turn my tasks into logical processes so I can check things off so I don't leave anything out.

For example:

Line Specs
Electrical
Process Control Schemes
Line Overpressure Situations
Proper Line Ratings and Spec Breaks
Potential Pocketed Lines
Incorrect connections between units (pumps, towers, vessels, etc.)
Needed isolation valves
Unneeded isolation valves

and so on...

In addition to the P&ID's look at the corresponding piping spec issues.  Do you want weld end valves in acid gas?  Assure that the elastomers are compatible with amine.  Does the chiller have a way to vent inerts without losing the refrigerant?

Are there seperate control systems, i.e. a basic process control system or DCS; and a safety instrumented system or shutdown system?  Do shutdown valves reflect position indication?  Do they use transmitters for shutdown signals instead of switches such as pressure switches or temperature switches?  Do they use newer measurement technologies or older technologies?  For examples consider radar / guided wave radar / magnetic level gauges; other than orifice & dp for flow, ...

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