Jim,
Maybe I missed the intro to what Craig was asking about, but I had the
impression that these systems were existing. That would make it very
difficult if not impossible to replace the sprinklers and fittings with
higher rated devices.
Craig? Existing or new?
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
[email protected] <mailto:[email protected]>e-mail
www.ParsleyConsulting.com <http://www.ParsleyConsulting.com>website
On 8/25/2011 8:35 AM, Jim Davidson wrote:
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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