Reasons why the fire pump shaft coupling will not start
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Today I replaced the check valve at the pump outlet, and after installation I found that the pump would not start due to the shaft being stuck. Any suggestions?
1. Unbalanced three-phase current, 2. Issues with the bearings
1. Foreign objects have entered between the impeller and the pump casing； 2. Damaged motor bearings ； 3. The motor stator and rotor are stuck together.
With such a small pump, if it can’t rotate. It’s better to check it in detail. Whatever the reason, it is abnormal. If it is started recklessly, it may cause greater damage or accidents.
Remove the mechanical seal and turn the motor fan blades; if they won’t turn, it’s a problem with the motor
Upon inspection, it was found that there is a problem with the impeller – it is too tight
It has nothing to do with whether a check valve is used or not. The pumps in the photo are arranged too closely together.