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Fire hose friction loss cheat sheet 2025

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The document is a comprehensive cheat sheet for drivers/operators in firefighting, detailing calculations for friction loss, nozzle pressure, appliance loss, and general flow rates for various hose sizes. It includes rules of thumb for pump pressures based on hose length, guidelines for drafting and hydrant GPM classifications, and essential firefighter math for calculating water flow and pressure requirements. The document serves as a quick reference to ensure effective water supply management during firefighting operations.

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Click ‘Get Form’ to open the fire hose friction loss cheat sheet in the editor.
Begin by reviewing the Friction Loss (FL) formula at the top of the sheet. Familiarize yourself with the variables: C (Coefficient), Q (Quantity), and L (Length of line).
Fill in the Length of line (L) based on your specific hose length, dividing by 100 as indicated. Use the provided coefficients for different hose sizes to calculate FL.
Next, input your Nozzle Pressure (NP) based on your nozzle type. Refer to the specified pressures for combination and smooth bore nozzles.
Calculate Appliance Loss (AL) if applicable, using the values listed for various appliances like Wye/Siamese or Deck Guns.
Utilize the Rules of Thumb section for quick reference on pump pressures based on hose lengths and types.

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How to reduce friction loss in fire hose?

For example, if youre going to flow 150 gpm, multiply the number at the tip of your middle finger (3) with the number at the base (9). The friction loss in a 100-foot section of 1 3/4-inch line flowing 150 gpm is 27 psi.

What is the friction loss per 100 feet of 1 3 4 fire hose?

Figure 2. The Hand Method (2-Inch Hose) Divide the number at the base of the finger by 100 (e.g., 100 = 1, 150 = 1.5, 200 = 2). Multiply that number by the number at the tip to find the friction loss in 100 feet of hose. Find 250 on your hand (between index and middle fingers). Divide 250 by 100: 250 100 = 2.5.

How do you calculate friction loss for a fire hose?

Replacing the hose with a larger diameter fire hose will reduce the friction loss because it increases the volume of water compared to the interior sides of the hose. Therefore, just going from a 1-inch diameter hose to a 1 inch diameter hose could decrease the friction loss by a factor of 7⁸.

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