Issue 2 and Volume 97.

QUESTIONS AND ANSWERS Wherein are answered questions relating to current problems in Fire Protection. Complex Layout To the Editor: Two pumpers are pumping into a turret nozzle (wagon gun) at a second alarm mill fire. The first pumper is a 1200-gallon, two stage parallel-series centrifugal pump. It is pumping through two 400-foot lines of 2 1/2-inch hose employing 1 1/4-inch nozzles, with a third 2 1/2-inch line 300 feet long leading into the gun. The pumper is working from a hydrant giving 30 pounds residual pressure. The second pumper is a 850-gallon (actual test) rotary gear pump and is pumping through one line of 2 1/2-inch hose 500 feet long. This line is equipped with 1 1/4-inch nozzle. A second line 500 feet long is supplying the gun. Hydrant residual pressure is 40 pounds. What pressure does each pumper maintain in order to supply this gun? Nozzle pressure is 80…

Subscribe to unlock this content

Subscribe Now