Hello Mike,
We have used AA x AA Male/Female extensions where both sizes are the same.
I have seen them in 1/2 3/4 1 lengths.
Thursday, May 8, 2008, 5:21:16 PM, you wrote:
Quick (I hope) question.
I don?t recall seeing this thread before. Are ½? x 1? male female nipple
extenders
I have recently had a disagreement with a AHJ on how to determine the
protection area of coverage for a sprinkler.
In my situation, we have an OH II area which has extended coverage
sprinklers (14x14) and one standard throw sprinkler.
The distance between the extended and standard sprinkler is 12
United Brass makes a 1/2 by 1/2 male by female and a 3/4 x 3/4 male by
female extender. These can be used to extend a drop that is cut too short.
AFSA in the past had a BEST PRACTICE written about the use of these. There
is some argument that these should not be used but they can be
I have a job site which is 10ft higher than the water supply. A gauge
on the water supply hydrant reads 55 PSI static pressure while two
gauges on the system riser after the BFP read 37 PSI? The total
elevation change between the system gauges and the supply gauge is about
17ft. Why would there
Gage calibration is my 1st thought. Check all the gages or use your own
calibrated gages.
Art
ATCO/Tiroly
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Dewayne
Martinez
Sent: Friday, May 09, 2008 1:55 PM
To: sprinklerforum@firesprinkler.org
Subject:
Perhaps there is trapped thermal pressure or surge pressure on the system
side of the BFP.
Russell R
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Dewayne
Martinez
Sent: Friday, May 09, 2008 1:55 PM
To: sprinklerforum@firesprinkler.org
Subject: Change
Look at the cut sheet on the BFP. Some BFPs require a significant
amount of pressure to open at very low flows. For example, an 12 Ames
2000SS requires almost 6 psi to operate at very low flow so it can sit
there all day with an upstream pressure nearly 6 psi higher than the
system side
Dwayne,
Were the pressures read on the gauges on the hydrant and the BFP at
the same time? Was any water flowing when these were read? We had a
situation recently where we had differing pressures and what we found
out was that the city had a 30 psi fluctuation in the street they did
not know
No, they were not read at the same time. The gauges on the BFP were
read last night and the hydrant information was read this morning by the
city water department. This is starting to make sense now. The fire
department said that the water tower is refilled at night so this might
account for the
Thanks,
I will look into the cut sheet. The fitter preformed an alarm test so
only a small amount of water was flown.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Paul
Pinigis
Sent: Friday, May 09, 2008 1:22 PM
To: sprinklerforum@firesprinkler.org
The BFP should trap the highest pressure on the system side so that
the up and down fluctuations will happen on the supply side. This will
read the same as the two gages on an alarm check valve when it is
acting as the only system/supply check. The water tower seems the
culprit. The elevation
If water was flowed on the system side of the BFP there can be a lower
pressure on the system side vs. the supply side due to the on-off
action of some axial-check BFPs. This is not the same phenomenon as the
pressure difference across an ACV because the ACV uses a simple
side-hinged check.
The starting point is the explicit guidance that addresses the last
sprinkler or branch line against a wall. You apply the longest
dimension from either side for both S and L. This places the
sprinkler in the center of the imaginary rectangle. The same
philosophy applies to
If the solution is not evident when you re-check, have the city put a
pressure recorder on the hydrant. That will show the ups and downs
over a period of time. In my situation it was 3 tanks that filled at
random times.
At 02:57 PM 5/9/2008, you wrote:
No, they were not read at the same
My thought is open up the BFP and check for rocks. The one time I've
seen odd numbers at the BFP it was due to rocks introduced by the
site plumber altering the incoming service unbeknownst to the fire
protection contractor who had already installed his stuff. Using the
numbers given, 55
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