I've read pressures off a hose bib, but never tried to pitot one.....
The other issue is that I don't think any fire fighter within earshot
of this Forum would want to hook up a 2-1/2" hose to a hydrant fed by
a 1-1/2" main and head toward a burning building.
At 10:21 AM 4/27/2007, you wrote:
Todd,
You don't really need a hydrant to do a flow test if all you want to
determine is the static and residual pressures, and the available
flow at some point. All you need are gages and an outlet or
two. As long as you know the size of the outlet, and the
configuration for the coefficient of discharge, you can put those
three numbers together.
Lot's of stuff about this in that enormous two-volume Fire
Protection Handbook. It's particularly interesting if you have a bad
case of insomnia or noisy neighbors and can't get any sleep.
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
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Todd Williams - work wrote:
Since most hydrants (that I'm aware of) are 5" or 6" , I doubt is
many would be connected to an1-1/2" line.
At 02:05 PM 4/26/2007, you wrote:
Ed,
In order to conduct a flow test on an 1-1/2" line wouldn't you
just have to find a way to provide an open orifice who's size and
coefficient of discharge, based on the configuration of the outlet, were known?
I've spent a little time reading through NFPA-291 (studying for
certification exams). It would seem possible to rig up some kind
of outlet to be flowed, and a port for a 50 or 60 psi gage on the
opposite side of the outlet, which would eliminate the need for a pitot tube.
Information in 291 suggests a gage so configured will yield
results approximately the same as a pitot.
I don't know, just thinking that one through.
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> e-mail
www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website
Ed Kramer wrote:
Scott - verify the size of main in the street. NFPA 13D doesn't require a
traditional flow test (only a static pressure), but it's based on the
assumption the public water main is 4" minimum.
If the main is indeed less than 4", a traditional flow test is justified.
Even at the low total flow of 2 residential sprinklers, the pressure drop
(residual pressure) in the 1 1/2" main can be significant. Now how to
conduct a flow test on a 1 1/2" line is a whole different can of worms.
Ed Kramer
Littleton, CO.
Do you recommend flow tests for residential systems?
I want one, but most people are telling me, the 1.5 inch pipe out in
the street with 50 psig is enough. (1.5 inch?????)
Does not seem like enough information to me. Don't have a level of
comfort with it. Have 2 stories above grade and want to use extended
coverage heads.
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