Identification of components and subsystems delivered by others.Miscellaneous - vents, drains, flanges, special fittings, sampling lines, reducers and swages.Control inputs and outputs ( sensors and final elements, interlocks).isolation, shutoff, relief and safety valves, valve interlocks) Valves and their types and identifications (e.g.Process control instrumentation and designation (names, numbers, unique tag identifiers), including:.Permanent start-up, flush and bypass lines.Process piping, sizes and identification, including:.Bursting discs, restriction orifices, strainers and filters, steam traps, moisture traps, sight-glasses, silencers, flares and vents, flame arrestors, vortex breakers, eductors.Pressure vessels, columns, tanks, pumps, compressors, heat exchangers, furnaces, wellheads, fans, cooling towers, turbo-expanders, pig traps (see 'symbols' below).They usually contain the following information: The primary schematic drawing used for laying out a process control installation.The instrument symbols used in these drawings are generally based on International Society of Automation (ISA) Standard S5.1 In the process industry, a standard set of symbols is used to prepare drawings of processes. A diagram which shows the interconnection of process equipment and the instrumentation used to control the process.A piping and instrumentation diagram (P&ID) is defined as follows:
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