seal pressure
seal pressure
(OP)
On an end suction single stage centrifugal pump, how can you determine the pressure at the mechanical seal? Also what would be the approximate flow around the seal relative to gpm through the pump?
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RE: seal pressure
As for seal flush flow, a good rule of thumb is a gallon a minute per inch of shaft size, for a Plan 11 recirculation from discharge. You can regulate that with an orifice or use one of the many flow and pressure control devices that seal mfgs offer.
RE: seal pressure
RE: seal pressure
The heat generated at the seal faces and minimum flow can be calculated. You might want to contact the seal vendor as they will have information about the seal face friction that is important for this. This way you can find the requirements of your worst case scenerio.
How restricted?
RE: seal pressure
RE: seal pressure
Perhaps a minimum flow loop or a motor power monitor would help. (Power monitors are cheap, and can be set up to get the operator to check out the pump before re-starting it. That way the operator can learn why the pump stopped in the first place.)
There are a few tricks that can be done to help the seal survive this but they really boost the price of the seal. Unless the deadheaded operation is impossible to get around I'd try to fix that first. In the long run the damage to the pump isn't worth it.
RE: seal pressure