hose valve pressure loss

[Todd Williams - work]

Someone in the Forum recently made a reference to friction loss in 
fire hose valves being around 3 psi with some higher. Is there any 
documentation for that? I haven't be able to locate any. Thanks.

Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com 

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