Questions and Answers

Issue 1 and Volume 87.

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 Relay Lines To the Editor: Will you kindly clear up the following points for me at your convenience? Centrifugal pumper—Increasing motor speed increases pump speed, hence greater pressure obtained. Then do we get a greater discharge of water? (Rated at about 700 g.p.m. at 120 pounds pressure.) What discharge at about 200 pounds pressure? Kindly involve a problem using two three-inch lines from hydrant to first pumper and two 2 1/2-inch lines from first to second pumper or such lines as you desire. I don’t seem to he able to match them up with rules on page 128 and 129, of “Simplified Fire Department 1 lydraulics “Where engine is operating at a pump pressure of 120 pounds, or thereabouts, the length of the hose…

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