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Friction Loss Data

The document provides a table detailing pressure loss in fire hoses based on various flow rates and hose diameters, measured in psi per 100 feet. It includes a formula for calculating friction loss and lists coefficients for different hose types and sizes. The data is sourced from the National Fire Protection Association and the International Fire Service Training Association, noting that figures may vary by manufacturer and hose age.

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Dante Corioriles
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68 views1 page

Friction Loss Data

The document provides a table detailing pressure loss in fire hoses based on various flow rates and hose diameters, measured in psi per 100 feet. It includes a formula for calculating friction loss and lists coefficients for different hose types and sizes. The data is sourced from the National Fire Protection Association and the International Fire Service Training Association, noting that figures may vary by manufacturer and hose age.

Uploaded by

Dante Corioriles
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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National Fire Equipment Ltd. Theoretical Friction


Interior Fire Protection - January 2003 Loss in Fire Hose

Pressure Loss per 100 feet (psi)


Hose Diameter
gpm flow 3/4" 1" 1 ½" 1 ¾" 2" 2 ½" 3" 3 ½" 4" 4 ½" 5" 6"
12 16 2 0
20 44 6 1 1 0
23 58 8 1 1 0
30 99 14 2 1 1 0
45 223 30 5 3 2 0
60 396 54 9 6 3 1 0
95 135 22 14 7 2 1 0
125 234 38 24 13 3 1 1 0
150 338 54 35 18 5 2 1 0
200 96 62 32 8 3 1 1 0 0
250 150 97 50 13 5 2 1 1 1 0
300 216 140 72 18 7 3 2 1 1 0
350 294 190 98 25 10 4 2 1 1 1
375 218 113 28 11 5 3 1 1 1
400 248 128 32 13 5 3 2 1 1
450 314 162 41 16 7 4 2 2 1
500 200 50 20 9 5 3 2 1
550 242 61 24 10 6 3 2 2
600 288 72 29 12 7 4 3 2
650 338 85 34 14 8 4 3 2
700 98 39 17 10 5 4 2
750 113 45 19 11 6 5 3
800 128 51 22 13 6 5 3
850 145 58 25 14 7 6 4
900 162 65 28 16 8 6 4
950 181 72 31 18 9 7 5
1000 200 80 34 20 10 8 5
1250 313 125 53 31 16 13 8

References: National Fire Protection Association (NFPA) Fire Protection Handbook - 17th Edition
International Fire Service Training Association (IFSTA) Fire Protection Publications - Fire Stream Practices - 7th Edition
These figures may vary depending on manufacturer and age of hose.

Formula for Friction Loss: FL = CQ² L


FL = Friction Loss in psi Q = Flow rate in hundreds of GPM
C = Friction Loss coefficient L = Hose length in hundreds of feet
Hose Diameter and Type (Inches) Coefficient Hose Diameter and Type (Inches) Coefficient
¾" booster 1,100 3" with 2 ½ couplings 0.8
1" booster 150 3 ½" 0.34
1½" rubber lined 24 4" 0.2
1 ¾" with 1 ½" couplings 15.5 4 ½" 0.1
2" rubber lined with 1 ½" couplings 8 5" 0.08
2 ½ "rubber lined 2 6" 0.05

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