Leadership

Questions and Answers

Issue 2 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 Pressures with Multiple Layouts To the Editor: Will you kindly solve the following problem? If we want a certain pressure at a nozzle we can find the correct engine pressure, and if we have a certain engine pressure we can find the nozzle pressure. These can be solved by the Underwriters’ formulas. This is all well and good for single lines off the pump. What I would like to know is this: How can I figure engine pressure and nozzle pressure when there are two or three lines off of the pump? If a pump has one line of 2 1/2-inch hose of 500 feet length with a one-inch nozzle, and 80 lbs. nozzle pressure is wanted, the engine pressure must be 167 lbs.…

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