Just follow through one line from its starting point (like from wellhead) at one page till the end (like flare) that might continued at another page(s). I believe anyone would be able to read a P&ID as long as they have a good imagination and attention span. Scope of work vendor-contractor interface (if any).Vents and drains except the one required for hydrotesting.Mechanical equipments with its identification tag numbers and nozzles rating.Intrumentations and its identification tag numbers.Valves and its identification tag number.Line number which you could define pipe sizes, system, and materials.Usually P&ID comes with the information of It might be shown very straight short line in P&ID and yet it is a long winding piping system in real world. It shows almost all of the piping material take-off (MTO) except for the elbows and length of pipes. This diagram is like a master document for everything we are going to build in piping system. P&ID is a non-proportional and not-drawn-to-scale schematic illustration that shows process flow of a piping system, connected with instrumentations and system equipments.
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