Somebody did and it was this Ron, not the one from Arizona.
On Apr 8, 2008, at 9:34 AM, John O'Connor wrote:
The weight of water in feet is .4331 per foot. 57.7 feet x .4331 =
25 PSI.
I think someone has the formula backwards.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ron
Greenman
Sent: Tuesday, April 08, 2008 11:13 AM
To: [email protected]
Subject: Re: Failed Bucket Test
Ron,
Check your math: 25.0 x 0.433 = 10.825
On Apr 8, 2008, at 8:47 AM, Fletcher, Ron wrote:
25 psi equals 57.7 feet of elevation and partially closed valves can
account for a reduced static pressure when dealing with city water
mains.
Ron Fletcher
Aero Automatic
Phoenix, AZ
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ron
Greenman
Sent: Tuesday, April 08, 2008 8:32 AM
To: [email protected]
Subject: Re: Failed Bucket Test
Brian,
Static doesn't change, even with a blockage (recovery time is slower
but
eventually reaches the pre-recorded pressure--hence the value of a
main
drain test), unless the original test was done during off-peak and
your
bucket test was done during peak, there is a pump involved that is
not
coming on or has been removed from service (your bucket test may not
have enough demand to fire it up but a hydrant test would--this begs
the
differences in static), the grid has been changed and the source, if
gravity, is lower, relative to the site, than before, the level of
the
tank was lower during your test (25 psi equals a little less than 11
feet) or the guy that produced the original numbers didn't know what
he
was doing (I got a report once that showed the residual pressure and
velocity pressure to be the same--the water guy wouldn't budge). If
you're in a residential area I'd look at the time of day and time of
year the test was done as well as the area, read grid, growth since
the
time the test was done. Mid day and mid night are off peak times as
is
winter in general during peak. The tanks may be low and your test may
have been done during or at the end of morning peak or the beginning
of
evening peak. The original test may have been done during summer at
midnight when usage was down and the tanks freshly replenished for
tomorrow's lawn watering. Lots of possibilities. I think our
reliable,
automatic water supplies are less than reliable but the alternative
seems to be stored water and pumps--extra equipment to fail.
On Tue, Apr 8, 2008 at 7:22 AM, Brian Harris
<[EMAIL PROTECTED]> wrote:
--
Ron Greenman
at home....
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