So you are telling us unequivocally that per their listing, there is
no separation requirement from the main drain?
Roland
On Feb 9, 2007, at 7:59 AM, Tim Frankenberg wrote:
The alarm check valves are not an issue for installing a vane type
flow switch. There is not enough of a water surge in the alarm
checks to create a problem. The standard specifically prohibits the
installation of a vane type flow switch on a dry pipe system.
Please contact me off of the forum if you need more detailed answers.
Kind Regards,
Tim Frankenberg, CFPS
Tim Frankenberg, CFPS
Fire/Security Product Manager
Potter Electric Signal Company
www.pottersignal.com
800-325-3936
[EMAIL PROTECTED] 2/8/2007 5:39 pm >>>
I have been told that when the flow switch is too close to an alarm
valve
the sudden flow can damage or tear off the vane. Just what I was
told once,
notta clue if it's a valid concern
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Roland
Huggins
Sent: Thursday, February 08, 2007 6:26 PM
To: [email protected]
Subject: Re: WATERFLOW SWITCHES
I suspect their use of the term LAMINAR FLOW is being applied too
casually.
It actually occurs only at very low flows. In a 1 inch pipe its
maximum is
around 1 gpm. I assume the concern was excessive turbulence
(whether real
or probably just imagined since listed assemblies can be much closer).
Roland
On Feb 8, 2007, at 3:13 PM, Thom McMahon wrote:
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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