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I got a question. In the P&ID, the pipe will have information such as size, spec, service, insulation size/type and etc. For signal line, is it necessary to have these kind of information? or they just a graphic representation with no information?

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It may be dependent on the industry, but in my experience that type of information is not included on a P&ID for instrumentation lines. Instead, there is an Instrumentation Installation Specification which defines the requirements for these lines, including material, size, routing, type and location of valves, etc.

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  • $\begingroup$ I see, so not all information is compulsory to be in the P&ID especially the instrumentation lines. Thank you for your sharing sir. $\endgroup$ Nov 23 '20 at 1:41

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