force main, overestimate?
force main, overestimate?
(OP)
I just got a call about a force main. They tell me it is 1100 feet long, fairly level( 10 feet differential), 8 inch line. This line is feed by a pump capable of 450 gpm at 31 feet total design head. But they also state that this line is operating at 150 psi. Since it is a sewer line, it outfalls to atmospheric. Can this operating pressure be possible?





RE: force main, overestimate?
However i think they may have got there figures wrong, when they spoke with you or have you been to site & checked ?
A quick check using a submersible pump would require something in the range of 6 to 7.5 kwatt motor, giving the required flow, normal solids handling say 4", velocity 1.0 m/sec ( sorry metric )
Even with a blocked or partial blocked line, they would still need one big big motor & for what to pump 450 gpm?
Suggest that you ask them to check there readings or visit site.
Electricsub
RE: force main, overestimate?
RE: force main, overestimate?
Also always remember, no matter what is wrong or goes wrong its always the pumps fault.
Electricsub