Why not use 250 psi rated high pressure sprinklers and use 300 psi
rated fittings, pipe and pipe joining devices such as Vic Grooved
product and 300 psi rated ductile threaded fittings. These products
were developed to reduce the number of PRVs in high rise buildings.
There should be no problem with using 250 psi rated sprinkler heads
and 300 psi rated pipe and fittings. You just need to check the
rating with the manufacturer's working pressure.
Have a fire safe day.
Jim Davidson
Davidson Associates
Fire Protection * Medical Gas * Code Consulting 302-994-9500
Fax:302-234-1781
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Thursday, August 25, 2011 9:46 AM
To: [email protected]; [email protected]
Subject: RE: Pressure reducing valves on system risers
I've already been told, no changes to the pumping systems or their
settings.
The idea of a large one with a smaller on a bypass may be the way to
go but I have to wait to see if the owner wants one on the run-in or
one on each system riser off the manifold.
Craig L. Prahl, CET
Fire Protection
CH2MHILL
Lockwood Greene
1500 International Drive
Spartanburg, SC 29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
CH2MHILL Extension 74102
[email protected]
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Joe
Sent: Thursday, August 25, 2011 8:58 AM
To: [email protected]
Subject: Re: Pressure reducing valves on system risers
Also what is the highest demand sprinkler or standpipe system ? Is
pump is overdesign see if modification to fire pump be done I.e.
Change impeller
Sent on the Sprint® Now Network from my BlackBerry®
-----Original Message-----
From: "Morey, Mike"<[email protected]>
Sender: [email protected]: Thu, 25 Aug
2011 08:44:07
To:<[email protected]>
Reply-To: [email protected]
Subject: RE: Pressure reducing valves on system risers
Can you provide a pair of PRVs at each manifold? Typically we'd look
at a large valve (say 6 or 8") with a bypass through a smaller valve
(maybe a 3"). Large PRVs have a minimum flow rate much higher than
one sprinkler would flow so the smaller PRV allows for low flows like
those that would be found when a single sprinkler activates.
Mike Morey, SET, CFPS
Sprinkler Designer
BMW Constructors, Inc.
O: 317.651.0596 | C: 317.439.2695
www.bmwc.com
________________________________
From: [email protected] on behalf of
[email protected]
Sent: Thu 8/25/2011 8:32 AM
To: [email protected]
Subject: RE: Pressure reducing valves on system risers
Ah there's the rub. This is a multi-building manufacturing site.
HUGE! A mixture of very large buildings and some not so large,
multi-story and single story. But a single story could be 50 ft
high. The problem is that the pump is overdesigned. Not sure if
the municipal supply changed or just a bad pump selection. Either
way doesn't matter. Already been told that they will not make any
changes to the pumps. So, any corrective action will be provided at
the risers.
They have a standard that dictates that buildings be zoned and that
each zone is served by a separate riser. Case in point, a new
2-story, 60 ft high, 60,000 total sq. ft. building has 8 system
risers fed off two manifolds, one at each end of the 300ft long
building. I can't do combination standpipe risers either.
Welcome to my world.................
Craig P
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Matt
Grise
Sent: Thursday, August 25, 2011 8:25 AM
To: '[email protected]'
Subject: RE: Pressure reducing valves on system risers
What is the building like? (are there upper floors that wont need
PRV's?) what is the water supply like?
Matt Grisé PE*, LEED AP
Sales Engineer
Alliance Fire Protection
130 w 9th Ave.
North Kansas City, MO 64116
*Licensed in KS& MO
913.888.0647 ph
913.888.0618 f
913.927.0222 cell
www. AFPsprink.com
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Thursday, August 25, 2011 7:21 AM
To: [email protected]
Subject: Pressure reducing valves on system risers
Got a major client whose system was poorly designed. They have their
jockey pump set for about 200 psi and their main fire pump is putting
out 180-190 psi. The local fire marshal has mandated that they
provide pressure reducing valves on the system risers for all new
systems. Anyone ever done this? Any recommendations?
Forget about doing the logical thing and looking at the pump, there
is very little common sense here and the process of change is long
and painful.
Craig P
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