Ten Wrong Ways Of Using Damaged Water Pump Are Discussed

The pump, as a water source conveying and pressurizing device, plays an important role in the water supply system. There are often some failures in the use of the pump, and most of the failures are caused by improper use.
1. Overload
Whether it is flow, pressure or speed, excessive deviation from the rated design point for a long time may lead to increased pump load, such as the full power of the centrifugal pump to shorten its life, or even "sudden death".
Second, abrasion
The liquid containing solid particles is transported, and the flow parts such as the pump cavity and impeller are continuously washed, so that the flow rate and head of the pump are reduced and the life is shortened.
Note: When the abrasion is severe, the abrasive surface will produce fish scales.
Three, pump body expansion and cracking
Because the outlet is blocked or the inlet pressure is too high, or the low temperature makes the liquid in the pump chamber freeze, resulting in the actual pressure of the pump chamber is much higher than its pressure, and the pump body cracks.
4. Vibration
The pump is installed on a rigid foundation that lacks vibration damping measures, or the foundation is too weak to provide sufficient strength. The lack of support in and out of the water pipe makes the force of the unit uneven bound the operation vibration of the pump, and the pump is like "jumping" on the trampoline.
Five, only close the valve, the pump is constantly powered
In addition to automatic pumps and intelligent pumps, ordinary pumps run in closed valve conditions for a long time, and there is no bypass, and all the energy consumption of the system is wasted in "heating" water, resulting in pump cavitation causing unstable operation of the pump, and even accidents.
Six, corrosion
The conveying medium corrodes the flow parts, machine seals, etc. For example, hydrochloric acid corrosion stainless steel, hydrofluoric acid corrosion silicon carbide and so on.
Note: The corroded surface will appear dense pinholes of varying sizes, like the surface of the moon.
7. Damp
1. The land pump is in a humid environment for a long time or the machine seal fails, and the leaking liquid spills into the unsealed part of the motor.
2, submersible pump seal, seal failure, the cable is not sealed, the pump in a wet environment into the moisture or cable fell into the pool, resulting in liquid intrusion into the motor cavity.
Note: There are water stains and condensation beads in the motor, and the insulation resistance is less than 50 megohm, which is regarded as damp.
8. Irregular inspection
The pump never gets enough "care", does not check and regularly maintain according to the instructions, does not regularly change the seal, iron pump, aluminum pump does not paint the pump, does not check the vibration, so that the pump from "minor illness" to "incurable disease".
Nine, poor heat dissipation
1, submersible pump motor, dehydration operation out of the water, or into the mud, making the motor slow heat dissipation, easy to lead to burning, especially the oil-filled motor poor heat dissipation there is a chance of explosion.
2, the land pump installed in a corner location or installed in a closed box, the fan can not make the surrounding air circulation, resulting in poor motor heat dissipation.
10. The medium is difficult to inhale
1, the inlet liquid level is too low, easy to produce eddy current, suction air, resulting in cavitation, flow head reduction;
2, the water inlet pipe or water inlet is blocked by foreign matter, resulting in reduced flow head;
3, the temperature of the medium increases, the vaporization pressure of the medium increases, the cavitation allowance decreases, resulting in a decrease in suction;
4, the inlet pipe is unreasonable (such as: the inlet pipe bends too much, the pipe diameter is less than the pump inlet), the pipeline loss increases, and the cavitation allowance decreases easily cause cavitation;
5. The elevation of the pump installation increases, the atmospheric pressure decreases, and the cavitation allowance decreases, resulting in a reduction in suction.