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What's the common issue causing magnetic drive pump failures?

If basic preventive maintenance measures are taken, the sealless magnetic drive pump does not often fail. However, in order to have better pump quality and operating efficiency, there are several basic concepts which we need to know. The following describes the main problems that may be encountered when using a pump.

1. Pump Dry Running

When the flow rate is insufficient or the liquid is not filled with the pump, dry running will occur. If the pump run dry, its internal components (such as impellers, bearings, etc.) will be rubbed, resulting in a lot of frictional mechanical heating and pressure, which will cause the magnet to demagnetize and then damage the pump.

2. Motor Overload

Motor overload occurs when a motor is under excessive load. The primary symptoms that accompany a motor overload are excessive current draw. The main reasons for the excess current are the increased load at the outlet of the pipeline, high lift, poor heat dissipation, blockage of the pipeline, wrong selection of the motor or pump, etc. At this time, the operating power will increase. During a long-time operation insufficient torque and overheating, the motor may cause burn out. 

During the operation of the pump, if the pressure of the pumped liquid drops to the vaporization pressure of the liquid at the current temperature due to the large resistance of the inlet pipeline and the large gas phase of the conveying medium in the local area of ​​ the overcurrent part (commonly found in the impeller), the liquid begins to vaporize to form bubbles. After the bubbles enter the impeller with the liquid, the surrounding high pressure causes the bubbles to shrink sharply and even burst.

At the same time when the bubbles are condensed and broken, the liquid particles fill the cavities at a high speed, which produces a strong water hammer at this moment, and hits the metal surface with a very high impact frequency.
Cavitation is the most harmful to the pump.
When cavitation occurs, the pump vibrates violently and makes noise, which will cause damage to the pump bearing, rotor or impeller.

4. Decoupling
As the temperature increases, the strength of the magnetic is weakened or the viscosity of the fluid is too high, the transmittable torque is less than the required torque, and if it continues to operate without cooling or sufficient torque, there will be demagnetization problems, which will cause the magnet to demagnetize and then damage the pump, resulting in failure.

In order to avoid these problems, the dry run protector is used to monitor the current or power of the pump motor when it is running. When the current is too high or too low, an immediate warning or automatic shutdown will be issued, which greatly reduces the probability of pump failure and maintenance costs.

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