I believe the distance was 5 pipe dia., this came originally from those
pesky Mech. engineers, and was to allow the turbulence from the valve to
subside, into a more laminar flow, which at the time was considered
necessary for the operation of vane water flow switches. Since we want to
measure any flow (as low as .7 gpm or less for some MFG.'s) Turbulent flow
actually is more likely to activate the vane switch than laminar flow at
those low flow rates, hence the very short distance from the valves to the
FS in the riser assemblies, and floor control assemblies.
I believe I have correctly re-stated the info given to me by the Potter rep.
at the last convention.
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "Roland Huggins" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, February 08, 2007 4:00 PM
Subject: Re: WATERFLOW SWITCHES
once upon a midnight dreary, the listing required vane type water flow
switches to be a minimum distance away from the main drain. Although,
if the same switch was part of a listed shotgun riser assembly, it could
be installed much closer to the main drain. I haven't looked lately.
Truth can be stranger than fiction.
Roland
On Feb 8, 2007, at 11:38 AM, <[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
wrote:
FYI The distance from a fitting or valve is only a "should" not a shall.
There are no UL or NFPA requirements regarding distance. There are a
number of riser assemblies on the market that put the switch closer than
the stated 24" from a valve or drain. If the switch works during the
test after installation it's a good installation.
Mike Cabral
---- Steve Leyton <[EMAIL PROTECTED]> wrote:
Look at the tech data sheet for the switch. For Potter Signal products
in the installation guidelines ...
Steve Leyton
Protection Design & Consulting
-----Original Message-----
From: Loren Johnson [mailto:[EMAIL PROTECTED]
Sent: Thursday, February 08, 2007 11:06 AM
To: Sprinkler Forum
Subject: WATERFLOW SWITCHES
Forum:
Can anyone direct me to where it indicates that a
waterflow switch for a wet pipe system has to be so
many inches away from the control valve or an
elbow/tee?
I seem to have seen this somewhere before, but now I
am unable to locate it. I thought it was in a pre-
vious edition of 13, but I'm not sure.
Thank you.
Loren Johnson - CFPS, CET
Fire Protection System Consultant
The Hitchcock Company
Peoria, IL
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