LIGHT HYDROCARBON (VOC) SEALING CENTRIFUGAL PUMP
LIGHT HYDROCARBON (VOC) SEALING CENTRIFUGAL PUMP
(OP)
What's the best solution for light hydrocarbon(LPG, propane, etc.)centrifugal pump sealing? I use dual seals API Plan 11/52, but I think It is very expensive,not so reliable and the operation is not so simple. I have read some papers about dry contacting secondary containment seal. I would like to know whether someone is using that. Is that really good? What about failure rate?
Regards, Javã
Regards, Javã





RE: LIGHT HYDROCARBON (VOC) SEALING CENTRIFUGAL PUMP
RE: LIGHT HYDROCARBON (VOC) SEALING CENTRIFUGAL PUMP
RE: LIGHT HYDROCARBON (VOC) SEALING CENTRIFUGAL PUMP
These seals do a really good job, if you are sure that you never get liquid on the secondary dry seal. Something I believe you cannot guarantee in a liquid propane application. You will at least sometimes during start up see some liquid propane in the buffer cavity.
why not look at some other dry seconrdary seal options. There are more rudimentry dry gas seals that have lift off pads machined in the carbon face and not in the hard face as is the case for the JC type 28 seal. My personal experience is that they do a very good job and they withstand liquid contamination by wet HC's at start up.
Don't get me wrong the JC 28 is a great seal. and will have less leakage than the more rudimentary seals I describe. It's just a bummer to have to pay so high a price for the repair parts if they have been started up with liquid contamination.
What type of pump are we talking about?
Best Regards.
Scalleke
RE: LIGHT HYDROCARBON (VOC) SEALING CENTRIFUGAL PUMP
RE: LIGHT HYDROCARBON (VOC) SEALING CENTRIFUGAL PUMP
John Crane has a 28VL seal, that is special for it. It is not necessary to use a Plan 52, maybe the inicial cost is high comparative than the wet seal, but then the seal will pay itself quickly because its maintenance cost will be lower.