Problem: A landfill in the state of New York was having to repair their pumps every year. It was found that they were removing the factory installed check valve so that the pump discharge line would drain back through the pump to prevent freezing during cold weather. This drain back at the time was great enough to cause the pump and motor to turn backwards. During wet weather the level in the sump would rise fast enough that the level sensor would send a signal to the pump to start while it was still turning backwards. This caused damage and wear to the coupling between the pump and the motor.
Consequence: A coupling wears and the pump will start to vibrate. This vibration will cause the pump and motor to wear faster and faster until there is a failure.
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