Single Hydrant Flow Test 1

[gjeppesen]

Hi,

I need to get the available fire flow on a dead end line with one hydrant at the end. At the tap of this dead-end line is a fire backflow preventer. Since there is only one hydrant, we don't have a gauge hydrant. The fire contractor did a "single hydrant" flow test, which I've never seen before. Are these accurate?

 

[Shawner]

This is sort of the procedure that I use to flow test the hydrants in our municipality and determine what color to paint them.

http://www.firehydrant.org/info/ftest1.html

Basically, you
- take static pressure
- flow hydrant
- take residual pressure
- take flow reading (pitot)
- calculate the max flow possible with hazen-williams equation.

Can use this online calculator on the same website

http://www.firehydrant.org/info/hycalc.html