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