Ahhh practicing the fine art of expressing a different opinion in a
humble manner (ok who's on Steve's computer?????). You KNOW he over
did it.
This is one of the few areas where logic is completely thrown out the
window. If you look in the Handbook, it states that the larger area
is required to compensate for the expected delay in sprinkler
activation (I thought it use to also say something about fire
breaking out in multiple areas too). This is a physical phenomena
thats not a function of the type of sprinkler. Nonetheless, LOCATION
HAS MEANING and with it located in 11.2.3.1.4 which further states -
regardless of which of the two methods (density/area or room
design)", it applies only to spray sprinklers in the occupancy hazard
approach. Similar text was added to general section 12.1 for Storage
in the 07 edition so it applies there too. BUT it does NOT apply to
the residential approach since it is a separate. individual approach
without such text. This is explicitly supported by the Handbook too
on page 507 (that even has a question in the margin emphasizing it).
Now having said that, this will change in the 2010 edition. Come
June, you can get a copy of the ROP and see such exciting tidbits
rumbling down the pike toward you. The May issue of Sprinkler Age
will also have several articles on likely changes that occurred at
the ROP phase (since nothing is a given until the new edition is
actually released by NFPA).
As for the corridor design, that is up for debate. It is a Special
Design Area under the density/area method using spray sprinklers so
I'll sit on the It Applies debate team.
Roland
On Apr 18, 2008, at 8:35 AM, Steve Leyton wrote:
I believe the AHJ overdid it. The 4 sprinkler design area for
residential sprinklers is paramount - you don't adjust it upward. If
your design area is a corridor, I don't think you would adjust it
either. Those provisions are for spray sprinklers and the area/
density
method.
Steve Leyton
Protection Design & Consulting
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