Not an issue. In a birdcage the riser is not serving and area greater than
5000 sq.ft. (usually). There may be dozens or dozens of dozens of risers.
And it's not exactly clear in the definitions but in a birdcage the vertical
piping more closely matches the definition of a branch line.
Chris Cahill, P.E.
Fire Protection Engineer
Sentry Fire Protection, Inc.
763-658-4483
763-658-4921 fax
Email: chr...@sentryfiremn.com
Mail: P.O. Box 69
Waverly, MN 55390
Location: 4439 Hwy 12 SW
Waverly, MN 55390
-----Original Message-----
From: sprinklerforum-boun...@firesprinkler.org
[mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Ed Kramer
Sent: Monday, March 30, 2009 10:06 PM
To: sprinklerforum@firesprinkler.org
Subject: Birdcage systems
Another post got me thinking (stand back). Section 8.15.21 and its
commentary seem to require a multistory building be designed so each floor
can be isolated while leaving the remainder of the system operational. If
that's the case, birdcage systems are doo-doo. Now I've designed a lot of
these type systems, so no high horse here. Just wondering how everybody
(especially AHJ's) interprets or enforces this section.
Ed Kramer
Littleton, CO
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