need help

Can not remember the formula for friction loss if there is any body that can please HELP
I need for 1 1/2,1 3/4, 2 1/2,5 inch hose. Been to long since I have used this knowledge and now I can not remember it.

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Permalink Reply by Kathy Appleby on June 21, 2009 at 2:47pm

i googled your question and here is a website that i think you will find very helpful. good luck. i marked this site for myself too.

http://www.fly2pbia.org/fire/pdfs/TrainingAndSafety/COPD/DriverOper...

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Permalink Reply by Ben Waller on June 21, 2009 at 3:02pm

I don't remember the IFSTA Coefficient for friction loss in 1.5 inch hose, but here are the rest:

1.75 inch - C=15.5
2.5 inch - C = 2
5 inch - C = 0.08

The formula is C(Qsquared)L where C is the hose coefficient, Q is the quantity of gallons per minute flowing divided by 100, and L is the length of the hoseline on feet divided by 100.

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Permalink Reply by Ben Waller on June 21, 2009 at 3:04pm

My department is finishing a hose coefficient test involving every engine crew, a couple of very good hydraulics instructors, and Akron representatives. We've derived actual 1.75 hose coefficients at an average of around 10. The range we derived was 8.65 to 11.67.

Our live tests have shown that our 2.5 inch and 5 inch C's are so close to the IFSTA numbers it's not worth discussing the difference.