Leadership

QUESTIONS and ANSWERS

Issue 1 and Volume 97.

QUESTIONS and ANSWERS Wherein are answered questions relating to current problems in Fire Protection. Finding Engine Pressure on Branched Layout To the Editor: Five hundred feet of 3-inch hose is branched into two lines, one of which is 150 feet of 2 1/2-inch hose with 1-inch tip and the other, 150 feet of l 1/2-inch hose equipped with a 5/8inch nozzle. The 1-inch nozzle has 50 pounds nozzle pressure. What is the nozzle pressure on the 5/8-inch nozzle? What is the engine pressure on the layout? D. C. Answer: The solution to the problem you give is as follows: First find the discharge from the 1inch nozzle, at 50 pounds pressure. Discharge = 29.7 x d x d x √P = 29.7 x 1 x 1 x √50 = 29.7 x 7.07 = 210 gallons per minute. Next find the friction loss in the 150foot line of 2 1/2-inch hose.…

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