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Who still uses 3.5" supply lines

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  • #16
    My department uses LDH as a primary supply hose, but many of our neihboring departments use 3 inch or 3.5 inch hose for supply. We have to know how to figure friction loss if we respond to a mutual aid fire. Since we use the 2Q2+Q formula, we have to use a conversion factor based on FL of 100 feet of 2.5 inch hose.

    The conversion factors are as follows,

    2.5= 1 or 100%
    3.0 with 3.0 couplings= .40 or 40%
    3.0 with 2.5 couplings= .38 or 38%
    3.5= .20
    4.0= .10
    4.5= .05
    5.0= .03
    6.0= .01

    hope this helps.



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