April 2003

Special Report: Maintenance/Reliability

Diagnostics capabilities of Foundation fieldbus pressure transmitters

Tests in an FCC unit showed both instrument and process problems could be detected

Eryurek, E., Emerson Process Management; Raterman, M., Szanyi, R., ExxonMobil Research and Engineering Co.

Over the past two years, the ExxonMobil Research and Engineering group tested the self-diagnostic capabilities of pressure transmitters with Foundation fieldbus (FF) capability installed on a refinery FCC unit. This project involved conducting a series of tests on the ability of the devices to diagnose plugged impulse lines. A typical purged instrument detail for a pressure transmitter in service on an FCC unit where catalyst is present is shown in Fig. 1. Three types of problems associated with the pressure transmitters and purge systems on an FCC unit, and with the FCC process itself, can be detected with the diagnosti

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