How are foam cups not an expanded plastic?
Joe
[EMAIL PROTECTED] wrote:
By definition I could consider this unstable as you described no actual
container, just the cups encapsulated in plastic holding up the next
pallet. When heated, they are going to change shape and could
potentially collapse the stack.
Honestly don't see a way to get around not changing the sprinklers.
Control mode (for unstable) would put you at .51/2500, but can the
piping network deal with that increase without excessive pressure drops
and velocities?
ESFR might be a nightmare in an existing pipe network plus the water and
pressure issues.
Your 15/50 was for expanded plastics, foam cups would not be expanded.
Craig L. Prahl, CET
Fire Protection Group
Mechanical Department
CH2MHILL
Lockwood Greene
1500 International Drive
PO Box 491, Spartanburg, SC 29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
[EMAIL PROTECTED]
http://www.ch2m.com
Fletcher, Ron wrote:
We have an existing building with Viking large drop heads at .45/2000.
Storage is being changed to 18 ft high Group A unexpanded plastic. 40
oz cups nested inside each other, shrink wrapped on four sides,
cardboard over the top on pallets on the floor, 32 ft. roof, no racks.
We want to add a pump without changing the sprinklers but I can't find
any criteria that suits the 32 ft. roof with LD heads. The closest we
can come to finding appropriate criteria is 15 heads at 50 psi but
it's for a 30 ft.
roof. The existing pipe size won't support 1.1/2500 and we are not
sure if we could classify the storage array as unstable to get to
.6/2500.
Is there a way to determine pile stability without a burn test or is
test data out there that I haven't found? Ideas appreciated.
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