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Our recycle gas compressor has a wet sealing system. We are facing frequent problems of seal leak because of which around 2 lube drums of oil is to be topped in the seal oil reservoir.
There is negative delta P(-0.2 Kg/cm2) between seal oil & reference gas.
I want to ask is only negative delta P signifies the seal leak of RGC.?
Does it signify that our reference gas line is choked?
A seal oil Overhead tank is provided above a height of 7.5 m above the seal level. Due to this head there should always be a +0.6 delta P between seal oil & reference gas.
 
Answers
29/03/2013 A: Nandhakumar Duraikkannan, TAKREER, nnandha3@gmail.com
Was the problem resolved?
08/06/2012 A: Bruce Carr, Suncor Inc, matukaze1@hotmail.com
The reference gas is normally equivalent to the suction pressure of the compressor. Systems I have dealt with the reference line comes from a port on the seal that is equalizes the pressures on the suction and discharge end (the discharge end is part of the balance piston chamber so it is also at suction pressure)... The reference line then is connected to the elevated reservoir that is what gives the delta P. If the reference pressure is below suction pressure you have a restriction.