For the same pump, the head measured in open-circuit testing is 20 meters lower than that measured in closed-circuit testing
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RT, I’ve thought about it over and over but still can’t figure it out; please help
This post was last edited by 3983596_FPPZ on 2018-10-11 at 13:33. The difference shouldn’t be this large; it’s likely a fault with the instrument or an error in the operation
I tested it several times: as long as the test bench was filled with water, the reading would be several dozen meters high, and it dropped by several dozen meters once it was connected to the atmosphere
The outlet valve should be controlled so that the pressure in front of the valve is at the design value; try that again. Because the flow rate into the atmosphere starts to increase, the pressure decreases. It’s worth a try.