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air bubbles in pump discharge

It's just a normal flange connection centrifugal pump from Flowserve.  The work I'm doing requires me to run the feed tank very low, and with the low NPSH I vortex at times.  Finally figured out a great new vortex breaker.
And with tightening the bolts on the pump casing, there's no more air in the system.  Uber happy.

What i've noticed, since I work with tri-clamp, is on some of the discharge piping, if I have a high enough velocity, it works kinda like a venturi or jet pump.  It will suck air there instead of leak.  So many strange things.
1gibson, I tightened the bolts on the housing.  8 bolts.  eahc turned about 1/8th of a turn.  And the bubbles went away.

I guess i don't understand why it didn't leak under high pressure.  But it's fine now.

I spent all morning trying different combinations with the pump and the system to see if i could isolate where the air was coming from, finally decided it was the pump and tightened the bolts.. viola.Pneumatic and electric  diaphragm pumps

2011-06-02

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