Actually this is part of the pre 1896 pipe schedule system I mentioned in
previous posts. The branch line sizing is less that the 1896 standards. No
major renovation >20%. Density requirements would be approx .24/2000.
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT
860-535-2080 (ofc) 860-608-4559 (cell)
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On Wed, Apr 27, 2016 at 8:31 AM, John Paulsen <j...@crwnfire.com> wrote:
Todd:
I have come across this situation a couple of times and in my experience,
you are waltzing in a mine field.
I am going to assume for the sake of argument that:
The existing pipe scheduled system is per the OLD Extra Hazard pipe
scheduled guidelines.
The Class IV storage usage is a change from the building's original
use.
And that the building has not undergone a > 20% area renovation
recently.
The commodity being stored would normally require the overhead
system to meet a design density consistent with an Extra Hazard demand.
NFPA 13, 23.5 relegates pipe scheduled systems to only being acceptable as
an existing situation and in my experience, any major change in use is an
excuse to prove it hydraulically and 23.5.4 states that all Extra Hazard
systems must be hydraulically calculated. However the part of your email
that states the AHJ has approved it, tells me that you could be picking the
wrong fight. You could do a quick calculation and show the existing system
to be woefully inadequate, then inform the owner and fire prevention. At
least you would have documentation that you brought it to their attention
in
the event of a fire.
John Paulsen - SET
Crown Fire System Design
6282 Seeds Rd.
Grove City, OH 43123
P - 614-782-2438
F - 614-782-2374
C - 614-348-8206
-----Original Message-----
From: Sprinklerforum
[mailto:sprinklerforum-boun...@lists.firesprinkler.org]
On Behalf Of Todd Williams
Sent: Wednesday, April 27, 2016 6:28 AM
To: sprinklerforum@lists.firesprinkler.org
Subject: Existing pipe schedule and storage
I am working at a facility where there is an existing OH pipe schedule
system over 12ft palletized Class IV storage. The fire department has
approved it, but I question whether it will provide adequate protection. I
did not see anything in NFPA 13 that requires storage occupancies to be
hydraulically calculated. Am I missing something?
This is outside of the project I am working on, but as an FPE, I feel
obligated to notify someone if I see a potential hazard such as this.
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT
860-535-2080 (ofc) 860-608-4559 (cell)
Sent using CloudMagic
[https://cloudmagic.com/k/d/mailapp?ct=ti&cv=6.0.64&pv=8.2]
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