2 replies to this topic

[deltaChe]

I have an cause effect question and hope any master in
process /I&C field can help.
interlock is to prevent accidental opening of circulation loop drains of V-67251

When the following conditions is happened,
XV-400 opened (holding vessel bottom valve)
XV-431 opened or XV-435 opened or XV-432 opened or XV-434 opened or
XV-436 opened
P-67251 running (holding vessel circulation pump)

the Action of following will start
XV-402 can not open (nitrogen to circulation loop at bottom of holding vessel)
XV-422 can not open (ODR, organic drain waste)
XV-423 can not open (EDR, aqueous drain waste)

My question is very sample.Why the orgainc waste drain valve and aqueous drain valve will
be closed as if the P-67251 is running.

Thank you very much for your kindly help.

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[daryon]

They are probably inhibited from opening whilst the pump is running to prevent the suction line draining and the pump running dry.

[iyer]

I agree, has to be to prevent pump cavitation. Is this a high capacity multistage pump? If so it makes even more sense