Questions and Answers

Issue 11 and Volume 93.

Questions and Answers NOTE—Readers are invited to send in questions, which will be answered in the order received. Names are omitted from questions unless otherwise specified Pump Priming To the Editor: Pumping water from draft with a centrifugal type pump, I have witnessed the following: The fire department takes the pumper to a body of water and primes the pump. The pump takes water and shows 100 pounds pressure on the gauge throwing a good fire stream and, after a short period of time, the pressure on the gauge gradually drops and eventually the pump has lost all the water. The pump can be primed the second time and will take the water, pump a stream at the same pressure and then gradually lose the water. What is the cause of the pump’s operating thus G. M. Answer: The performance of the centrifugal pump, which loses suction, after it has…

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