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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 adjustments. 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 document. Familiarize yourself with the variables: C (Coefficient), Q (Quantity), and L (Length of line).
Locate the Coefficient values for different hose sizes. Input your specific hose size to find its corresponding coefficient, which is crucial for accurate calculations.
Fill in the Quantity (Q) based on your flow rate in GPM. Remember to divide by 100 as indicated in the cheat sheet.
Calculate Appliance Loss (AL) based on your equipment. Refer to the provided psi values for various appliances and input them accordingly.
Utilize the Rules of Thumb section for quick reference on pump pressures based on hose lengths, ensuring you have a practical understanding of operational needs.

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We have answers to the most popular questions from our customers. If you can't find an answer to your question, please contact us.

How to do the hand method?

2:26 8:03 So what were doing as thats always our baseline. And then we just have to pick the extra step toMoreSo what were doing as thats always our baseline. And then we just have to pick the extra step to convert it to 2 and 1/2 which is times 2. So the in between numbers.

What is the hand method for fire hose friction loss?

The Hand Method Its not your standard friction loss formula, but it still gets the job done. Assign each gpm setting to a finger: 95 gpm to your thumb, 125 gpm for your index, 150 gpm for middle, 175 gpm for ring finger and 200 gpm for your pinkie. Number each finger, 1 through five, starting with your thumb.

How do you calculate friction loss for a fire hose?

Consider the equation: FL = c (gpm/100)2 L/100. The c term is the so-called friction loss factor and measures the pressure loss per 100 feet. This is multiplied by the square of the volume flow (gpm) and hose length (L) to get total friction loss.

What is the Q method for friction loss?

2:15 3:50 Minute. Its going to be 10 squared is going to be 100 100 / 5 is going to be 20. So we have 20 psiMoreMinute. Its going to be 10 squared is going to be 100 100 / 5 is going to be 20. So we have 20 psi friction loss per 100 ft of hose in a 4in hose then a 5 in hose.

What is the friction loss of a 4 hose?

The friction loss in four-inch hose flowing 500 gpm is approximately five psi. Dividing 40 psi by five psi equals eight. This means that this hydrant will flow 500 gpm for 800 feet using four-inch supply hose.

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How do you calculate friction loss in a fire hose?

1:46 5:14 Loss. If we remove two sections or a hundred feet of our hose. We will see that our total frictionMoreLoss. If we remove two sections or a hundred feet of our hose. We will see that our total friction loss drops to 42.

What is the hand method for friction loss?

The thumb is 1, the index finger is 1.5, the middle finger is 2, the ring finger is 3, and the pinkie is 4. To determine the friction loss per 100 feet of hose at the desired flow, select the finger with the desired flow, and multiply that number by the number at the tip of the same finger.

How to use the hand method to calculate fireground pressure losses?

3:42 8:22 Example. So what were going to do is determine the friction loss. First were going to have 150MoreExample. So what were going to do is determine the friction loss. First were going to have 150 gallons per minute out of 100 ft. So its 3 *. 12 36 so friction loss is going to be 36 the nozzle.

Fire hose friction loss cheat sheet 2025

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What is the friction loss of a 4 hose?

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