Issue 10 and Volume 143.

FRICTION LOSS FOR 1 3/4-INCH HOSE TRAINING NOTEBOOK For some years now the 1 3/4-inch handline has been working its way into the fire service as a replacement for the ever-faithful 1 1/2inch line. The 1 3/4-inch has some advantages over the 1 1/2-inch line, among them larger gpm flows, less friction loss, and less pump discharge pressure needed. However, to the best of my knowledge there hasn’t been a fast and easy way to calculate friction loss in 1¾inch hose. Usually the pump operator either memorizes the friction loss for each gpm he’s flowing or carries a calculator with him. Here’s an easy-to remember method that I’ve developed and found to be accurate. Turn the palm of your left hand up as you would for calculating friction loss in 2 1/2-inch hose. Assign numbers in order to your finger tips, with the thumb tip being number 1 and the…

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