Multistage centrifugal pump head can not be reached by a variety of reasons, The technical staff of Zoomlian Pump industry summarized the reasons and solutions for the following four multi-stage centrifugal pump heads to reach.
First, check the suction part of the pump
1. Ensure that the suction pipe is well sealed:
Carefully check the various connection parts of the suction pipe, including flanges, threaded interfaces, etc., to see if there is gas leakage. If a leakage point is found, replace the sealing gasket and tighten the connection bolts in time to ensure the tightness of the pipeline and prevent air from entering the pump and affecting the normal water absorption and pressure establishment.
2.check whether the suction filter is blocked
If the suction filter is blocked by debris, slag, etc., it will increase the resistance of water flow into the pump, resulting in insufficient pump suction water, and then cause the outlet pressure to decrease. The suction filter should be cleaned regularly to remove the debris attached to it to ensure that the water flow enters the pump body unimpeded.
Second, check the internal components of the pump body
1.check the impeller condition:
The impeller is the key work component of the pump, if the impeller appears wear, corrosion or debris entanglement, it will affect its work ability to water, resulting in the head can not reach. The pump body can be opened to check the impeller, if the impeller is seriously worn, it is necessary to replace the new impeller in time; If there is debris entanglement, should be carefully cleaned up.
2. check the pump seal
Damage to the mechanical seal or packing seal may lead to water leakage in the pump, reducing the amount of water actually involved in the delivery, resulting in a drop in outlet pressure. Check the wear of the seal, if it is a packing seal, the filler can be added or replaced appropriately; If the mechanical seal is damaged, replace it with a new mechanical seal component.
Third，Check the motor and transmission parts
1.check the motor speed
Insufficient motor speed will directly affect the operating condition of the pump, resulting in insufficient outlet pressure. Use a tachometer to measure the actual speed of the motor and compare it with the rated speed of the pump. If the motor speed is lower than the rated speed, it is necessary to further check whether the power supply voltage of the motor is normal and whether the motor is faulty. If the power supply voltage is insufficient, adjust the power supply system to ensure that the voltage is stable within the specified range. If the motor fails, the motor should be repaired or replaced.
2.check the coupling or belt drive
For multi-stage pumps with coupling or belt drive, if the coupling is loose, different hearts or belts slip, etc., it will cause the power transmission efficiency to be reduced, so that the pump can not run at normal speed, and then the head can not reach the situation. Check whether the connection of the coupling is firm, whether the concentricity meets the requirements, if there is a problem, adjust in time; If the belt drive, to check the tension of the belt, appropriate adjustment of the tension wheel to keep the belt to maintain a suitable tension, to avoid slipping.
Fourth，Consider operating conditions and other factors
1. check the outlet pipeline condition:
If there is blockage in the outlet pipeline, such as scaling inside the pipeline, foreign matter accumulation, etc., it will increase the resistance of water discharge, resulting in limited pressure rise at the pump outlet. You can check the outlet pipes in sections and use the dredging tool to clear the blockage in the pipes. In addition, if there is leakage in the outlet pipeline, the actual output pressure will be reduced, and it is necessary to find and repair the leak point in time.
2. Check whether the operating parameters match
Ensure the correct selection of the pump, its flow, head and other parameters to match the actual operating conditions. If the head required for actual operation is higher than the rated head of the pump, the head may not be reached. At this time, it may be necessary to re-evaluate the working condition and replace the appropriate pump model, or to meet the operating requirements by connecting other pumps in series or parallel.
When dealing with the problem of multi-stage centrifugal pump head can not reach, it is necessary to carefully investigate the possible causes, and take appropriate measures according to the specific situation. If you cannot accurately determine or solve the problem, it is recommended to contact professional maintenance personnel or equipment suppliers in time.