Pump current issue
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The 2 pumps are connected in parallel; the standby pump starts automatically, the inlet is fully open, and the outlet has the same opening degree as the operating pump. The medium being transported is water at 160°. The current required to operate the pump has increased from 88 to 95, while the flow rate and pressure remain unchanged. I would appreciate it if an expert could analyze this situation. Thank you
Is there any internal leakage in the check valve or valve of the standby pump? Is there cavitation in the pump? Single-stage pump or multi-stage pump? What is the inlet pressure? The flow meter should be on the main pipe, right?
I don’t understand the question – when does the current reach 95? The current remains at 88 while the pump is running continuously. In order to switch to automatic mode, should the outlet of the backup pump be kept fully open, resulting in a current of 95, or should the outlet of the backup pump remain fully open and then the operating pump be started, with the current still at 88 when the outlet is closed, and rising to 95 once the outlet is opened?
The outlet head should be higher. As the natural power increases, efficiency may decrease as well, while power still increases
Check the temperature of the backup pump to see if the motor is running in reverse.
Is there anything abnormal with the shaft seal of the pump or similar components, causing increased resistance? Is increased internal leakage in the check valve of the standby pump causing local backflow?
Check the check valve on the standby pump~~ You can try closing the outlet of the standby pump to see if the current level decreases~~
What are the changes in the conditional factors compared to normal times? Let’s learn about it too... The water temperature is really high
There is no cavitation; it is a single-stage pump with an outlet pressure of 1.1 MPa
Since the vehicle started running, the backup pump has remained in this state; the current consumption of the operating pump has increased from 88 to 94 over these few days