Quote:
Originally Posted by Amail
Thanks for the video. In there he shows pressure sensors on both the suction and discharge side of the pump. If you close off the pipe on the discharge side, I see how you get pressure (thanks, pump!). How do you get any pressure on the inlet side though? For instance, my pool water level is about a foot above the inlet of the pump, so I could see measuring a foot of head on the inlet side. But my friend's pool has the pump higher than the water level, so wouldn't it measure suction?  |
Suction on a centrifugal pump is measured in PSIA, not PSIG. Absolute pressure so it would be just under 15 psia at atmospheric pressure.
Then it would be converted to net positive suction head (required and available).
But that's a mute point (I know, it was on porpoise) because the suction on a swimming pool pump is going to be pretty stable, I can't see it changing much at all.