Actually the pressure differential across the #1 check is a MINIMUM of 2
PSI. So if the MFG has put heavier springs in their device, they can reduce
them and maintain their listings, as long as the differential is 2.000+ Psi.
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: Tuesday, May 01, 2007 1:02 PM
Subject: Re: Ames RPZ BFP
Are the BFP's also listed with the weaker springs?
This is a known problem especially with low static pressures. The device
mfg were suppose to address it but I believe all they have done is to
point at the trapped air and say, "Not our problem".
Roland
On Apr 30, 2007, at 1:35 PM, Ed Kramer wrote:
Many, many times. It's always been the same manufacturer. To their
credit, they've been pretty good about supplying checks with weaker
springs, as Tom mentioned. Have the owner/contractor contact the local
rep.
Ed Kramer
Littlton, CO
During waterflow alarm testing on a Wet Pipe NFPA-13 System I witnessed
a phenomena wherein the vane type waterflow switch fluctuated back in
forth appx every 10 seconds making it impossible to set a 30 second
retard. Supply Pressure is 60 psi static, 55 psi Residual at 2" Main
Drain Test. The WF Switch is mounted horizontally in a straight length
of 6" Sch 10 48" from closest change in direction. Inspectors test is
located downstream end of a branch line 1/2" orifice in place.
The sprinkler contractor suspects theres a problem with this particular
BFP. Anyone had a similar problem.
Thanks
John Drucker
Fire Protection Subcode Official (AHJ)
New Jersey
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