I don't know that it is written anywhere for walls, but if rack shelves
can be considered open with wire mish shelving more than 70% open, the
same would go for walls.
I was just responding to your statement that it was a grocery stock room
and was class IV. If they have specified how they want it done, why are
you worried about the wall?
Joe
Bobby Gillett wrote:
Joe,
Thanks for your reply as well.
I was hoping that the 70% was accurate, but could only find it applied in
8.6.5.2.2 as stated in an earlier response, which is for light hazard. Is
there somewhere else that states that this applies to something other than
LH?
As far as the hazard classifications, this is an pre-engineered set of
drawings that has us calc'ing two different ways in the same area. The
design engineer firm wants these areas calc'd .45/2000 and .55 for the most
4 demanding sprinklers. That is our instruction and other than the town,
they are the AHJ along with the insurance company and they agree w/the
design engineer for the project. We have no storage info other than how to
do it and they state in writing this is how they want it done.
Bobby Gillett
Project Manager
[EMAIL PROTECTED]
(731)-424-0130
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Joe Hankins
Sent: Monday, October 22, 2007 3:33 PM
To: [email protected]
Subject: Re: Vertical mesh wall
Bobby,
If the "wall" is 70% open or more, it would not be an obstruction to
sprinkler discharge. You would, however, have to extend the higher
density beyond the "wall" because in terms of sprinkler operation, it
would be absolutely no different than no wall.
As an aside, there isn't a grocery store stock room anywhere in the real
world that meets the criteria for a class IV commodity. Commodity
classification is done on a pallet load/carton basis, not the overall
mix in the room. If there are plastics or other higher hazard
combustibles in the room, then it should be protected for that. If there
is nothing worse than a class III, then that's your design. Unless it
is filled with products having no more than 15% plastic in each carton
or pallet load, it's not class IV.
At some time of day and season of the year, any grocery store stock room
is going to have lots of plastic or worse. You're not designing a
sprinkler system to work some of the time.
Joe
Bobby Gillett wrote:
I guess my replies got lost, try again.
This is Class IV comm and we have EC sprinklers (storage room in
Grocery/Shopping store). Wall of mesh keeps people out of a certain areas
in
the back store room.
Bobby Gillett
Project Manager
<mailto:[EMAIL PROTECTED]>
[EMAIL PROTECTED]
(731)-424-0130
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