Pump Sizing 1

[Edadunn]

I have a pump system that is pumping from an elevation of 597. From this point the force main travels up to an elevation of 605. From this point, the force main goes down to an elevation of 560 then back to the 605 elevation.

My question. Do I calculate the static head from the 597 elevation where the pumps are located or the 560 low point elevation downstream from the pumps?

Please help. Thanks.

 

[dtn6770]

Suction static head should be based on the distance between the liquid level and the pump centerline or impeller eye.

 

[rzrbk]

Static head on the discharge should be calculated from the pump location. (605'-597'=8') Friction losses should be added to that.

As a side note, the pump may need to be throttled at its discharge during initial filling of the line to keep a siphon effect from pulling it out past the end of its curve. Also, will need air bleeds at line peaks.