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What fails in a centrifugal pump when it runs dry?

A 3/4 HP 10 GPM shallow well pump for irrigation ran dry for a couple hours due to a technical failure where a feeding valve mounted at the pump inlet blew out of its hole. All the water being pumped ...
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Why would 2 different sprinkler zones cause pressure at the pump to drop to 0?

Why would 2 out of 3 sprinkler zones cause the pressure reading at the pump to drop to 0? This is a well irrigation system and it is separate from the home's well. The pump is a 3/4 HP, has a flow ...