Ron, 25 ft = 10.825 psi 25 psi = 57.7 feet Ron
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Greenman Sent: Tuesday, April 08, 2008 9:13 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.... > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) Ron Greenman ...at home _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
