mrelet
Mechanical
- Nov 1, 2001
- 49
I am running tests that measure the pressure response beneath a pool drain after the drain is blocked suddenly and then the pump is turned off 1/2 to 1 second later. I am finding that a limit is reached in the effect of increasing pump size and flow rate on the time (dT) for pressure to equalize after the blockage. I surmise this is due to the pressure dropping towards a vacuum, but of course never exceeding it. However, it is difficult to explain why a larger pump could have dT less than a smaller one. Could it be that larger pumps have larger internal passageways and so relieve pressure faster than smaller pumps? The pumps are Starite Dura-Glas P2RA5EL(1 hp) and Pentair Challenger CHII-NI-3FE (3 hp).