Piping and Instrumentation Drawing P&ID’s are the first and most important document for any engineering project.
The document/drawing which act as the input /starting point for many disciplines.
Just to simply define P&ID:- It is a diagram which shows the interconnection of process equipment and the instrumentation used to control the process.
P&ID is rich source of information which is required as input for preparing specification and various other documents. P&ID can looked for follwoing information.
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Instrument Type
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Line number
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Line size
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Line properties
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Insulation requirement
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Vessel/Tank trim material
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Vessel/Tank pressure/temperature rating