concur, we ignore even rated walls unless using room design method.
There is new guidance on how to address small subsystems (such as dry-
pipe on loading docks or preaction in computer room) in the 2013
edition of NFPA 13. This use to be a particularly tricky issue when
applying logic for an answer when the sub-system like a loading dock
uses spray sprinklers and the adjacent warehouse system uses ESFR.
See the June issue of Sprinkler Age for more information.
Roland
On Aug 31, 2012, at 10:57 AM, Cahill, Christopher wrote:
1. Assuming they are the same system. Yes, where does it say you
can reduce the area below 2,535? Getting the total area is almost a
Cardinal rule. Only way out is room design method if it applies.
But that entails being reasonably sure the required walls will
remain after the legendary cable guy comes through. One reason the
room design method is flawed, owners can take down walls without
even thinking sprinklers (as long as they are 6' apart). I
guarantee during inspection no one knows if it room design or not.
I know we can't plan for the future.
2. Same answer.
Chris Cahill, PE*
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