Bill,
You are correct. Sometimes politics prevails.
Joe
Brooks, Bill wrote:
Joe,
I thought I understood your train of thought until I started considering the
area reduction for quick response sprinklers. How many rings are there with
a 10 ft ceiling height QR design? 900 sq ft or 5 heads.
Can I conclude the ring theory falls apart when this design approach is
used? It looks like you don't have your 1 ring cushion in this case.
Bill Brooks
Pittsburgh, PA
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Joe
Hankins
Sent: Friday, March 16, 2007 11:56 AM
To: [email protected]
Subject: Re: Minimum Supply Pressure
The idea that there is a huge difference between a 5-sprinkler fire and
a 15- or 30-sprinkler fire seems logical on the surface, but if you know
how sprinklers operate, you know they operate in rings. The heat that
operates sprinklers spreads in a circle from the fire origin. For
symetrically-spaced sprinkler system where the fire starts centered
among 4 sprinklers, there are 4 sprinklers in the first ring around
ignition, so there is virtually no difference between a 1-sprinkler
fire and a 4-sprinkler fire. If those sprinklers don't control the fire,
then any (and all) of the 12 sprinklers in the next ring can operate,
meaning that there is very little difference betwen a 5-sprinkler fire
and a 16 sprinkler fire. If you get into the next ring, then the number
is 36 sprinklers. So, the 1-ring "safety factor" between 4 and 16
sprinklers is the same as the 1-ring safety factor between 16 and 36
sprinklers. A 1-ring "safety factor" is not overkill in my book!
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
