I want to verify the pump curve of a regenerative turbine pump. The manufacturer doesn't supply any pump curve of it.
This is the test setup.
With the discharge valve shut off (plugged) and water line opened. I measured the following discharge pressure of 28 psi.
This is the inlet or suction pressure of 14.3 psi.
Is it correct to deduct the discharge pressure from the suction pressure to arrive at the head dead pressure? It is 28 psi - 14.3 psi = 13.7 psi.
So 13.7 psi is the pump dead pressure right?
I made a lot of measurements with pressure gauges and water flow rates to get some idea of the pump curve which the pump doesn't have
This is the pump specs. 8 is the meter in heads or about 11.7 psi.
This is my bathroom minipump connected to a heater and shower with 2 gauges label by A and B. The green arrow is the water pipe entry to the bathroom with 1/2 diameter hole. It can produce 10 liter per minute (2.64 gallon per minute) when directly measured with a container without all the hoses which are 1/4" in diameter (note all tankless heaters use the same 1/4" flexible hoses).
Without the pump turn on. I'm getting 4 liters per minute (about 1 gallon per minute) of water in the shower. With pump turn on. I'm getting 6 liters per minute (about 1.6 gallon per minute of water in the shower).
With and without the pump turned on. The gauge in the bathroom pipe entry labeled in A read 13 psi.
Without the pump turned on. The pressure gauge at B (after pump) reads 10 psi. With the pump turned on. The pressure gauge (after pump) reads 20 psi.
Do the actual test data above support the pump specs shown above?
From my existing water of 6 liter/minute (1.5 gallon per minute). I want it to be at least 2.5 gallon per minute (or 9.4 liter per minute). So i need to understand pump curve to be sure i got the right one.