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Horizontal multistage centrifugal pumps Installation precautions


Many companies will require installation and commissioning after purchasing horizontal multistage centrifugal pumps, and some dealers do not understand installation and commissioning, and it is difficult to find manufacturers, especially multi-stage pumps with a small amount of money. Unacceptable, so most of them do not support on-site guidance, so I will introduce the installation and precautions of horizontal multistage centrifugal pumps.
Preparation before installation of horizontal multistage centrifugal pump:
1. Prepare installation tools and lifting equipment;
2. Check whether the components of the pump unit are loose or damaged during transportation;
3. Check whether the foundation is level.
2. Installation sequence of horizontal multistage centrifugal pump
1. When the unit is transported to the site, the person with the base has already calibrated the pump and motor. When leveling the base, it is not necessary to remove the pump and motor, so the installation is very convenient;
 2. Put the base on the foundation, and put a wedge-shaped iron near the anchor bolts, and pad the base by 20~40 mm high for filling with grout after leveling;
 3. Check the levelness of the base with a spirit level, fill the base with cement slurry after leveling, and check the level again after the cement dries up;
 4. When the power of the unit is high, the pump, motor and base may be packaged separately for the convenience of transportation. At this time, users need to install and calibrate the pump unit by themselves. The method is as follows:
a. Remove the dirt on the supporting plane of the base, the feet of the water pump and the feet of the motor, and place the water pump and the motor on the base;
b. Adjust the level of the pump shaft and fix the pump on the base with bolts after leveling to prevent it from moving;
c. Lift the motor, make the pump coupling and the motor coupling match, and lower the motor to the corresponding position on the base;
d. Adjust the gap between the two couplings to about 5mm, and correct whether the axis lines of the motor shaft and the pump shaft coincide. The method is to put a flat ruler on the coupling, and the outer circle of the two couplings should be aligned with the flat ruler. If they are not coincident, adjust the relative position of the motor or pump, or use thin iron pads to adjust;
e. In order to check the installation accuracy, the gap between the two coupling planes should be measured with a feeler gauge at several different positions on the circumference of the coupling. The difference between the maximum and minimum gaps on the coupling plane should not exceed 0.3mm. , The difference between the top and bottom or left and right of the center line at both ends shall not exceed 0.1mm.
5. When the unit does not have a base, it needs to be installed directly on the foundation. The method is similar to that of 4., but more attention should be paid to calibration.
Three, the installation precautions of horizontal multistage centrifugal pump
1. The pipeline should not be put on the pump during installation, otherwise the pump will be easily damaged;
2. The anchor bolts must be tightened during installation, and the unit should be inspected every certain period of time to prevent it from loosening, so as to avoid severe vibration when the pump starts running and affect the performance of the pump;
3. Before installing the pump, carefully check whether there are hard objects (such as rocks, iron sand, etc.) in the pump flow path that affect the operation of the pump to avoid damaging the flow components during the operation of the pump;
4. For the convenience of maintenance and safe use, a regulating valve should be installed on the inlet and outlet pipelines of the pump and a pressure gauge should be installed on the inlet and outlet flanges of the pump. For high-lift pumps, in order to prevent water hammer, Install a check valve in front of the outlet gate valve to cope with power loss accidents such as sudden power failure, so as to ensure that the pump runs under the best conditions and prolong the service life of the pump;
5. When the pump is used for suction lift occasions, it should be equipped with a bottom valve, and the inlet pipeline should not have too many bends, and there should be no water leakage or air leakage, so as not to affect the suction performance of the pump;
6. In order to prevent impurities from entering the pump and blocking the flow path to affect performance, a filter should be installed in front of the pump inlet;
7. Rotate the rotor parts of the water pump before installing the pipeline. There should be no friction or jamming, otherwise the pump should be disassembled to check the cause.

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