Threaded Bowl Pressure Limits
Threaded Bowl Pressure Limits
(OP)
How do I calculate pressure a threaded bowl will hold? The bowl is an intermediate bowl of a submersible multistage centrifugal pump or a multistage vertical lineshaft bowl assembly.





RE: Threaded Bowl Pressure Limits
Also, just a comment or question really.
We have seen the better companies switching over the past years to "O" ring bowls with bolts from threaded bowls. Threaded bowls have always been a problem and most pump manufacturers have wanted to switch over but some lacked funds to do it.
What do you think?
PUMPDESIGNER
RE: Threaded Bowl Pressure Limits
RE: Threaded Bowl Pressure Limits
I know what you are talking about with the smaller bowls, it is important to avoid increasing diameter.
Sorry I cannot help more.
We established a company policy forbidding the use of threaded bowls. Everything 6" and larger we use bolted bowls only. Small stuff makes us cringe because we cannot obtain good pumps. You have any sources for good 4" submersible turbines with trimmable impellers?
PUMPDESIGNER
RE: Threaded Bowl Pressure Limits
Although we have rarely if ever trimmed that 4" impeller I see no reason why you couldn't. I have not ever tested it with a trimmed impeller. At 3450 rpm and BEP we are looking at 70gpm and 21ft per stage. The effeciency is only
about 66%. I don't know of anybody that does much better on small pumps. These are just to small to get very good efficiency. Hope we might could help you.
Thanks