How to judge whether a single-stage centrifugal pump needs exhaust
To determine whether a single-stage centrifugal pump needs to be exhausted, the following methods can be used:
1. Observe the operating status of the pump
Pump body sound: Listen to the sound of the centrifugal pump when it is working. If there is gas residue in the pump body, abnormal noise such as cavitation or knocking may be generated. In contrast, the working sound of a pump with complete exhaust should be relatively stable.
Pressure gauge and vacuum gauge: Observe the readings on the vacuum gauge at the inlet of the centrifugal pump and the pressure gauge at the outlet. Before starting up, if the numbers on the vacuum gauge and the pressure gauge are both 0, it may mean that the air in the pipeline has been exhausted, but this also needs to be combined with other judgment methods. After starting up, if the pressure gauge reading is low or fluctuates greatly, it may indicate that there is still air in the pump or pipeline that has not been exhausted.
2. Check the pump body and pipeline
Exhaust pipe observation: If the exhaust pipe of the centrifugal pump is transparent, you can judge whether the exhaust is complete by observing whether there are bubbles inside the exhaust pipe. If there are bubbles, it means that there is still air in the pump or pipeline.
Pump body vibration: When there is air in the pump body, it may cause the pump body vibration to intensify. Therefore, you can judge whether exhaust is needed by observing the vibration of the pump body.
3. Based on operating experience and fault phenomena
Starting load: If the pump is loaded with a large load or difficult to start at startup, it may be caused by the presence of air in the pump or in the pipeline. At this time, exhaust operation is required.
Drainage situation: If the pump is not draining smoothly during operation or the liquid is cut off after drainage, it may also be caused by the presence of air in the pipeline or the gas in the pump is not completely exhausted. In this case, exhaust treatment is also required.
4. Comprehensive judgment
In actual operation, it is often necessary to combine the above methods to determine whether a single-stage centrifugal pump needs to be exhausted. At the same time, it is also necessary to pay attention to the use environment and operating conditions of the pump, such as water source conditions, pipeline layout, pump installation location, etc., which may affect the exhaust effect and operating status of the pump.
Precautions
Before performing the exhaust operation, make sure that the pump has stopped running and cut off the power supply to avoid accidents.
During the exhaust process, pay attention to the changes in the pump body and pipeline, and adjust the exhaust method and time according to the actual situation.
If the pump still cannot operate normally after exhaust or there are other faults, contact professional maintenance personnel in time for inspection and treatment.
