Mark,
What about maintaining adequate flue spaces, and no solid shelves? It
sounds like your bin boxes/shelf units have neither, ragardless of storage
height. 150,000 sq.ft. is an fairly large area for something that doesn't
really conform to the intent of ESFR protection. Are you maybe thinking
this is an ordinary hazard occupancy, and ESFR is allowed over OH
occupancies?
Jeff Hewitt, PE, SET, SFPE (Professional Member)
Corporate Engineer
Bi-State Fire Protection Corporation
241 Hughes Lane
St. Charles, MO 63301
636-946-0011
636-946-5172 (FAX)
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----- Original Message -----
From: "Phelps, Mark" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, June 23, 2008 3:23 PM
Subject: RE: ESFR Sprinklers over 8' library shelves
Joe,
Thanks for the response. To give you a little more detail, the shelf units
are approximately 14" deep by 4' wide with 5 shelves high to 6'. The
shelving is all sheet metal with solid backs and ends. The shelves are
arranged in rows, back to back, and share a common divider, (like double row
racks without a longitudinal flue). They have 4' aisles and are open on the
top shelf. This storage arrangement occupies an area of about 150,000 square
feet in a building that encloses 500,000 square feet. There are 2 X 4 foot
light fixtures, AC ductwork up to 26 inches in diameter and banks of conduit
up to 3" in diametter and over 2' wide through-out the ceiling space of this
building.
To clarify your second paragraph, when you refer to "meet the obstruction
rules", I assume you mean these obstructions at the roof, as I have just
discribed, and not the shelves themselves?
Thanks again,
Mark at Aero
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Joe
Hankins
Sent: Friday, June 20, 2008 7:21 PM
To: [email protected]
Subject: Re: ESFR Sprinklers over 8' library shelves
Mark,
First and foremost, this is an application that (due to what I presume
are solid shelves) takes advantage of none of ESFRs strengths but is
subject to all of their weaknesses. Unless these shelves are in a small
area of a facility that is otherwise a good fit with ESFRs, ESFRs are
the wrong choice.
If the ESFR protection is already existing and the shelves meet all
definitions of shelf storage, then you are OK as long as you meet the
obstruction rules.
The bottom line is that, in order for suppression to reliably occur, you
have to meet the obstruction rules, regardless of storage height. While
lowering the storage height makes a fire easier to suppress, increasing
the clearance makes it harder. The solid shelves further exacerbate the
challenge.
Joe
Phelps, Mark wrote:
Mr. Joe Hankins, If you are on line, could you comment on the application
of ESFR (K14 at 75 PSI) installed below a 40' high roof protecting class I
thru IV misc storage on library style shelves (not an actual library). My
specific question is, " do all of the design requirements and obstruction
requirements (conduit banks, lights, ducts, etc.) and exceptions apply
equally as if it were double row racks of I thru IV stored to 30'?
Mark at Aero
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