1. Steering error
If the pump flow and head are lower than the normal value and the motor current is less than the normal value, the pump is a new installation or just change the motor, often this phenomenon. When the pump flow is not enough, we must first pay attention to the investigation, attention to observe whether the motor is correct, such as the reverse, adjust the motor wiring can be.
2. Pump lid runner not on
For double support of the pump, and has just been maintenance, test no pressure, need to check whether the pump cover up and down, this phenomenon can be observed from the appearance, such as the case is indeed the case, the disintegration of the re.
3. Pipe leakage
Inlet flange gasket or flange bolt is not good, may cause leakage of pipelines and pipeline centrifugal pump flow and pressure. Tighten screws or gaskets to solve problems.
4. Impeller mounted counter
Two impeller outlet direction is wrong, can lead to no pressure.
5. Impeller shaft fracture
Multistage centrifugal pump without flow, pressure and reduce the motor current, pump has been in operation for a long time, listen carefully, listen to sound of a flowing medium that impeller does not turn, we must overhaul maintenance, to determine the shaft is broken.
6. Impeller assembly key damage
This phenomenon usually occurs in the operation of the pump for a long time, the key serious wear and tear, can not drive the impeller rotation, the need for new parts
7. Impeller mouth ring and pump body mouth ring gap is too large
Long period operation of the pump, probably because the mouth ring gap is too large caused by pump flow is reduced, but this amount of change should not suddenly becomes small, but is a slow process, if the pump operation for a long time not serviced, the flow becomes smaller but smooth operation, is likely to export ring caused by wear must be disintegration inspection can be found. The solution is to replace the new pump body inlet and impeller ring.
8. Pump cover runner or impeller channel blockage
If the device has been a major overhaul or new equipment to drive soon, the media, the pipeline is dirty, it is possible to cause the impeller, pump casing blockage, flow rate decreases, the flow rate must be reduced.
9. Pump outlet diffuser damage
In the small flow, high lift pump, the outlet diffuser damage, can significantly reduce the flow and pressure of the pump, because the rotor intact, so will not produce vibration, the disintegration of inspection and maintenance.
10. Pump selection is wrong
If the medium viscosity, density, or other parameters and the pump capacity is not consistent, it is not the ideal state, the need to consider the type of pump selection.
