C Value 2" Flexible Hose 1

[cr1973]

Anyone know the C values for 1" rubber hose, or 2" and 3" flexible hosing, commonly used on hydrant outlets?

I've been assuming 90 or 100.

 

[bimr]

Typical values of c for commonly used rubber-lined hoses are as follows:

Hose diameter c value
1" 150
1-1/2" 24
2" 8

The values of c for various hoses, can be found in the Fire Protection Handbook published by the National Fire Protection Association (NFPA).

http://www.msha.gov/regs/complian/ppls/2006/PPL06-V-2appendix.pdf

 

[LHA]

Note the NFPA equation the c bimr gave is not the H-W equation. So the NFPA c does not equal the C in the H-W equation, if that is what you wanted.

Engineering is the practice of the art of science - Steve

 

[cr1973]

Sorry, I should have been more clear - I am looking for the Hazen Williams C value.

Anyone have a rough idea, am I pretty close using a c of 100?

 

[bimr]

C=100 for rubber hose is probably a conservative value and hardly think that anyone would second guess you for that.

 

[blueoak]

I have seen values of 130 that correspond with manufacturer friction loss tables, a little higher than probably occurs with an older hose.