I have to admit in embarrassment that I had not looked at the annex
information in A.9.1.1.8. You were entirely correct, Ryan, it does
identify that the sprinkler piping itself can be used to support other
sprinkler piping if the five criteria in 9.1.1.2 are followed. Those
include:
1. Support 5x weight of water filled pipe + 250#
2. Point of support adequate to support the system
3. Spacing cannot exceed limits of 9.2.2.1(a) or (b).
4. Hanger materials shall be ferrous
5. Detailed calculations must be submitted when required by AHJ showing
stresses developed and safety factors involved.
What has always held me back from starting down this path is items 1, 2,
and 5. I don't know if the 5x+250 rule includes both the upper and
lower sprinkler piping, of if the point of support evaluation is for a
load applied on sprinkler piping or the building structure for the
combined loads, and I don't have enough structural engineering
understanding to even attempt to develop calculations to show the
stresses and safety factors.
For me it's always been less expensive to use a trapeze than to hire a
structural engineer to provide the calculations.
sincerely,*
Ken Wagoner, SET***
Parsley Consulting****
350 West 9th Avenue, Suite 206*****
Escondido, California 92025*******
Phone 760-745-6181*******
Visit our website <http://www.parsleyconsulting.com/> ***
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