P&ID 是什么意思? p&id is an initialism that could mean: 1.piping and instrumentation diagram - a schematical diagram showing piping, equipment and instrumentation connections within process units in oil refineries, petrochemical and chemical plants, natural gas processing plants, power plants, water treatment and similar plants. 2.process and instrumentation diagram - a family of functional one-line diagrams showing hull, mechanical and electrical (hm&e) systems like piping, and cable block diagrams. a p&id is a full diagrammatic representation of a process plant. each piece of equipment is shown along with its connectivity to other equipment. it may be regarded as an enhanced process flow diagram which shows, in addition to the process itself, details such as control and instrumentation equipment, pump and pipe sizes etc. each instrument / piece of equipment is shown by a symbol denoting its type (pump, sensor, valve etc.) and a unique identification number or tag for differentiation from others. p&id shows all of piping including the physical sequence of branches, reducers, valves, equipment, instrumentation and control interlocks. the p&id are used to operate the process system. a p&id should include: instrumentation and designations mechanical equipment with names and numbers all valves and their identifications process piping, sizes and identification miscellaneous - vents, drains, special fittings, sampling lines, reducers, increasers and swagers permanent start-up and flush lines flow directions interconnections references control inputs and outputs, interlocks interfaces for class changes seismic category quality level annunciation inputs computer control system input vendor and contractor interfaces identification of components and subsystems delivered by others intended physical sequence of the equipment [ ]查看更多
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