This is with regard to the shutdown signals of a four stage Reciprocating COmpressor for process Air service (disc pressure of 32 barg). The compressor is of API618 compliance...As per table 5 of API 618, there are four signals that calls for shutdown of the equipment.
All the four signals ( Vibration, Lube oil pressure, Inter stage Separator moisture /water level and inter-stage air temp). The first two are already connected to ESD system where as the Inter stage separator level and air temp are presently connected to DCS system to initiate trip when these two parameters go for HiHi. We also have pre-alarm Hi for the above two signals.
The clarification here is whether these two signals are also to be connected to the ESD as a part of Equipment protection? It is argued that DCS system is not reliable as ESD. How shall we approach this ? IPF study has been conducted and it allowed these two signals to get connected to the DCS system but Client does not agree to this ....
Thanks to guide .