Slurry pump impeller is strictly Prohibited from rotating in reverse, it is so important that all Slurry pumps maintenance engineers need to know this.
If the impeller reversed,it will fall off from the pump shaft,what is more serious is that it will result in damage to the entire pump,so this problem must be paid enough attention. Here are some serious consequences if Operating pump in reverse rotation :
1. Slurry pump impeller falls off
Slurry pump impeller and shaft are connected by a one-way thread, when the normal operation ,shaft  screw threads will be able to get a good grip,slurry pump impeller will be tightened up ,the more you use it, the more easy operation. But if the impeller is reversed,it will fall off at once.
2. Slurry pump wet end parts damage
When slurry pump operates, the impeller rotates at very high speed, and slurry pump impeller are very heavy,and made of high chrome alloy, so once the impeller reverses and falls off,it will slam into the slurry pump volute liner,you need to replace new slurry pump wet parts.
3. Slurry pump mechanical seal damage
The mechanical seal is made of 316 stainless steel,rigid substances,not flexible materials.When reversal occurs and impeller falls off,opposite acting force will move shaft back to the motor,resulting in stationary ring and dynamic ring collision. The moment of impact is very large, it can directly damage the huge split mechanical seal.
4. Slurry pump shaft bend
Once the pump reversal occurs, impeller reaction force may directly impact on the shaft, if there is a lack of rigidity and strength,will directly cause shaft bend,unbalanced pump shaft will cause excessive shaft vibration,and result in lots of big noise.
5. Slurry pump bearing overheat
Slurry pump shaft which is not straight may causes abnormal wear on all its bearings, and bearing temperature will rise sharply,could reduce the service life of the bearing.
Reverse rotation often occurs during the commissioning of new pumps or new motors,So we must determine the correct direction of rotation before the motor is connected to the slurry pump.