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- W4240553677 abstract "One of the critical decisions that the Process Control Engineer must make is which way a control valve will move upon loss of instrument air pressure. When creating the process & instrumentation diagrams (P & IDs) for a plant, the control valves should be labeled as follows: APO (air pressure opens the valve) — APC (air pressure closes the valve). On top of the control valve, there will be the mechanism that moves the control valve stem up or down. That's called the control valve diaphragm. It is entirely possible to displace air from a control room with nitrogen when the instrument air compressor trips off. This chapter shows the outcomes while placing control valves on the discharge of centrifugal compressors and centrifugal pumps. It also shows four control valves associated with a fired heater and their failure positions in the event of a loss of instrument air pressure." @default.
- W4240553677 created "2022-05-12" @default.
- W4240553677 date "2017-03-24" @default.
- W4240553677 modified "2023-09-23" @default.
- W4240553677 title "Control Valve Position on Instrument Air Failure" @default.
- W4240553677 doi "https://doi.org/10.1002/9781119267799.ch13" @default.
- W4240553677 hasPublicationYear "2017" @default.
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