Ron,
How about this, from the 2007 edition of NFPA-13?
11.2.3.4 Special Design Areas.
11.2.3.4.1 Where the design area consists of a building service chute
supplied by a separate riser, the maximum number of sprinklers that
needs to be calculated is three each with a minimum discharge of 15 gpm
(57 L/min).
11.2.3.4.2* Where an area is to be protected by a single line of
sprinklers, the design area shall include all sprinklers on the line up
to a maximum of seven.
11.2.3.4.3 Sprinklers in ducts as described in Section 7.10 and 8.15.12
shall be hydraulically designed to provide a discharge pressure of not
less than 7 psi (0.5 bar) at each sprinkler with all sprinklers within
the duct flowing.
I'm not sure, but I think at least some of that applies to what you're
describing.
PARSLEY CONSULTING
Ken Wagoner, SET
760.745.6181 voice
760.745.0537 fax
[email protected] <mailto:[email protected]> e-mail
www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website
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