The water pump has insufficient flow, what is the problem?
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Two water pumps of the same model, when operated alone, the flow rate of any one is about 20 cubic meters. The flow rate is the same when the two units are turned on together. It could reach 30 cubic meters before, but now it is 10 cubic meters less. Is there a leak in the intake pipe or is there a blockage somewhere?
When two pumps operate in parallel, the flow rate is not the sum of the flow rates of the two pumps. The operating point of the pump is determined by the device characteristic curve.
If there is a performance curve for this pump, you can check if the outlet valve is fully closed. Does the pressure when the flow rate is zero match the dead center of the curve? If they match, check the inlet and outlet pipes.
The outlet pipe diameter is too small and the resistance is too great.
Maybe the actual lift is too high, causing the flow rate to drop.
The outlet pipe may be too small, causing high resistance.
It should be that the actual head is too high and the flow rate has dropped. In the early days, the motor speed and pipe resistance were relatively suitable, and it could be driven up to 30 cubic meters, but now it can’t.
Please look at the outlet pressure gauge. According to the nameplate, it is about 1 bar. If it exceeds a lot, it is a problem with the outlet pipeline.
This is a self-priming pump from Chuanyuan. Check to see if the impeller is worn. It used to be able to reach the flow rate, but now it can't. It's probably a problem with the pump.