>From Denise at hydro flow:
Here are the pitot formula and coefficients for all sizes of the Hose
Monsters and Nozzle Inserts.
Q = 29.83 * √P * D2 * Coefficient
Where Q = flow rate in GPM, P = pitot pressure, D = nozzle diameter
Product Coefficient
Nozzle Insert 1 1/8” 0.99
Nozzle Insert 1 ¾” 0.975
Hose Monster 2 ½” 0.906
The 4” and 4 ½” Hose Monsters actually use a different formula
because they are not using a pitot, but these numbers work for the above
pitot formula.
Product Coefficient
Hose Monster 4” 0.71159
Hose Monster 4 ½” 0.54816
The Pitotless Nozzles are different also.
Links to flow charts for low, "normal" and high pressures:
http://www.hosemonster.com/downloads/FCHM2H.pdf
http://www.hosemonster.com/downloads/FCHM2HLP.pdf
http://www.hosemonster.com/downloads/FCHM2HHP.pdf
* * * *
Obviously, the chart is pretty darn convenient when you're in the field;
rather than use a calculator when I've gone out without the chart, I just
use my cel to call the office and ask someone for the GPM for my pitot
pressure.
Saw the pitotless nozzles last week at AFSA- pretty neat. They've come a
long way!
TGIF
glc
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:sprinklerforum-
[EMAIL PROTECTED] On Behalf Of Todd Williams - FPDC
Sent: Friday, October 24, 2008 2:35 PM
To: [email protected]
Subject: Re: Pitot Chart
Dennis,
Why would the pitot have a chart? Is this actually a diffuser or
nozzle with a built-in pitot?
What I did with my Hose Monster was to use the chart and calc
backwards to come up with the K factor, then I wrote it on the HM
with a permanent marker. That way, if I lose the chart, oh well.
At 02:10 PM 10/24/2008, you wrote:
>I have a "Sierra" brand Pitot I bought circa 1990 and my Fitter
>lost the chart yesterday while doing a flow test. I think it is the
>very similar to the one listed in the Potter Roemer catalogue. I was
>hoping someone could email or fax me a copy? Hate to buy a new one
>over the chart. Thanks in advance.
>Fax 541 245 0498
>Phone 245 0466
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