P & I Diagram for Central Plant

[smpsmp45]

I think on this forum we should come together to form the basic guidelines for P & ID based on these inputs.

US ICEman had sent a paper earlier written by him. Now we need to extrapolate on that further.

[US Iceman]

Then a pressure indicator has the XX PI 001 and a relive valve for the ammonia trap is XX PRV 001

That's the sort of logic I like. The tag relates to the specific component, the valve itself, and a unique number. Having the instrument tags arranged with this or a similar order helps to provide information on the control addresses for ease of location also.

I also like to see something for the control loops on the drawings. For example: a float switch controls a liquid line solenoid valve. A solid line connecting the float switch and solenoid shows the two are related in function. It's also common to use a different symbol for local or remote mounted instrumentation.

The amount of information you can read from a well developed P&ID is worthwhile to help understand the system.