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Center Centrifugal Compressor

Center Centrifugal Compressor

Center Centrifugal Compressor

(OP)
Greeting all,
we have a center centrifugal compressor with a seal oil system has PDCV SET @ 35 PSIG above the suction pressure.
Why we need a seal oil system , the Mechanical Seal is it enough to do the sealant ?
Why we keep it above the suction pressure not the discharge pressure?
what will happen if the difference pressure in the seal system reach 0 PSIG or the seal pump get shutdown, the gas will escape out side?
Is there a relation ship between the seal oil system and the balance line ?

I worked in Oil Gas plant and I need to Ander stand the seal oil system.

RE: Center Centrifugal Compressor

Why we need a seal oil system , the Mechanical Seal is it enough to do the sealant ?
the rpm is to high to use mechanical seal
options are gas seal or oil seal
Why we keep it above the suction pressure not the discharge pressure?
because normally a compressor is designed to have suction pressure on the seal (via compensating holes in the impeller or via external pipe)
what will happen if the difference pressure in the seal system reach 0 PSIG or the seal pump get shutdown, the gas will escape out side?
gas will accumulate inexpansion vessel of seal oil system
balance line connects seal area to suction side (hence the pressure at the seal=suction pressure)

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