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Water Pump Maintenance

Published on 2019/09/03

In the long-term use of water pumps, due to wear and tear, corrosion, dirt damage, aging and other reasons. Their efficiency will gradually reduce, trouble will also occur. Therefore, we want to extend the service life and improve the efficiency of sewage treatment of the pump, the works of water pump maintenance must do will. In the face of the pump prone to failure, it is necessary to judge the failure timely. Taking targeted measures to eliminate the trouble, and ensure the stable operation of the pump.

Water pump maintenance in daily

1. Carry out regular preventive maintenance
In strict accordance with the regular maintenance plan and periodic arrangements, a regular check of the pump and surrounding equipment to ensure the normal operation of the pump. Daily Inspection and maintenance mainly include: check the pump pipeline and joint loose phenomenon, screw plug, leather pad and other loose or wear. Water pump oil room whether flooding water. Whether the bearings need to replace the lubricating oil. Whether the impeller wear.

2. Real-time Monitoring
The operating parameters and performance of a water pump are monitored under working conditions. The operating conditions can be accurately grasped by observing the mechanical vibration and noise and referring to the relevant data such as pump current, flow rate, pressure, etc. Early detection of problems and corresponding maintenance treatment.

Water pump maintenance in daily

Method of finding trouble

Although the daily or regular maintenance of the pump, the pump the fault will still occur in the operation. It requires staff to have the ability to identify different faults.

1. Auscultatory method
The voice is regular when pumping operation in normal. When hearing abnormal noise, the staff can be based on the noise to infer whether there is loose inside the pump, an unbalanced place whether debris into the pump impact. Further judgment is to use an electronic stethoscope to diagnose, the electronic stethoscope can be mechanical equipment vibration into electronic signals and amplification. The staff through the public address equipment to carefully identified. The abnormal qualitative judgment carried out to avoid the interference of other noises.

2. Observation method
Workers can observe the pump parts to determine the trouble. If all kinds of parts whether have loose and crack. Whether the lubricating grease is normal. Whether the instrument which on the water pump equipment is normal to display. Then recording the observed situation. Analysis of all the relevant information in comprehensive.

3. Vibration and temperature measure method
This method is mainly aimed at the analysis of the shaft and bearing of the water pump. The water pump is very sensitive to the damage of the bearing. The vibration parameter meter can measure exactly how big the vibrations are. Through multiple monitoring of different sensor positions, the frequency distribution of multiple monitoring results is analyzed and compared. The position corresponding to the data with prominent frequency is the position where the bearing appears abnormal.

water pump oil leakage
Common troubles and maintenance plan

When identifying all kinds of troubles, we need according to the pump equipment type, file records and daily maintenance records comprehensive analysis and judgment, then make the corresponding maintenance. Through the daily work summarizes the common breakdown and the maintenance method is as follows.

1. No water
① water isn’t filled, increase the water pump inlet height or reduce the installation position. ② The suction pipe is leaking, it need to replace the suction pipe. ③ Debris blocking, this is a common situation. There is debris lead to the impeller abnormal operation, or the pump head of the check valve block, resulting in the motor running slow. As long as the timely clearance of debris in the impeller channel can be.

2. Insufficient lift
The head of the pump is insufficient mainly because the outlet pressure can not meet the needs of the working condition. The causes of this kind of failure are generally cavitation of the pump and serious wear and tear of the impeller after long-term use Matching motor speed is lower than the required speed of the pump, etc. The troubleshooting method is to increase the water pump inlet height or reduce the pump installation position, the replacement of serious wear impeller.

3. Pump heating
The blockage of the impeller will lead to a heat pump. Pump heat may also the pump bearing bending, damage, rolling shaft clearance is too small. Timely replacement of bearings, in the bearing housing and bracket cover between the installation of gaskets, adjust the concentricity of bearings can solve the pump heating failure.

4. Low-speed or overload operation
Low speed or overload operation of the water pump. One case is man-made. When the original distribution motor has trouble, a motor is randomly assigned for use. The motor and the loading capacity of the pump are mismatching, then results in operation trouble. We should strictly in accordance with the pump model requirements to replace matching the corresponding motor model.

In addition, the bending deformation of the pump shaft, the actual operation beyond the range of design parameters, the friction of the rotating parts and so on. At this point, it needs to check and correct the pump shaft, control the pump capacity. To keep within the parameters allowed. If necessary, to open the pump body to check and eliminate friction.

5. Mechanical seal failure
The mechanical seal makes the two end faces of the pump tightly combine. a layer of oil film is placed on the end face to achieve the sealing effect. If the mechanical seal damage, the body will appear leakage, oil leakage. Leakage will wet the motor winding, the value of insulation resistance of the winding will reduce and the leakage current will form.

When the leakage current switches on, the leakage protector will trip. At this time, the motor needs to be removed to dry, and the mechanical seal needs to be replaced. When there is an oil mark in the inlet regulating place, first needs to unscrew the oil hole screw in the inlet regulating place and observe whether the oil chamber is filled with water. If the oil chamber into the water, the seal is bad, it should replace the seal box.

Another need to pay attention to a leakage situation is that the water pump cable root oil, this is the motor oil leakage. Generally is the sealing poor or motor winding lead unqualified or broken water pump wiring board caused. After confirming the inspection, replace the new accessories.

In addition, the staff should take an active part in the maintenance, summarize the maintenance rules, find the root causes. Through the common trouble of the pump preventive treatment, to completely eliminate the failure.