Your points are quite well taken. One of the concepts for which I
gained a better understanding during the six-story building seismic
testing in 2012 was the real value of flexible couplings in certain
locations to protect the sprinkler system from damage during an
earthquake. The goal for that protection along with the bracing and
restraint is to have the sprinkler system still be functional after an
Some of the video from that testing also reinforced the requirement
in 126.96.36.199 mandating that bracing shall not be attached to sections
with differential movement. It was very surprising to see how much
oppositional movement between adjacent structural members took place
during the testing.
Some of the videos are available on Youtube. An introductory look
is here <https://www.youtube.com/watch?v=6oJ-4Oq5YRA>. The overall
report video is here <https://www.youtube.com/watch?v=6LA3uLEE2jY>.
Proud to say that I was a small (on the sub-atomic level) of this
*Ken Wagoner, SET
*350 West 9th Avenue, Suite 206
*Escondido, California 92025
Visit our website <http://www.parsleyconsulting.com/> ***
On Sep 21, 2016 7:30 PM, "Bruce Verhei" <bver...@comcast.net
I don't have 13 in front of me. But personal experience is that
pipe that is attached to roof, and then down to columns, racks, or
(tilt-up) walls is subject to breaking when the ground moves. This
seemed worse when attachment to one surface is rigid, i.e.
Unistrut-type channel and clip. Walls and racks seemed worse than
I was quite shocked at how effective flex couplings were at
Many breaks I saw were in auxiliary drain and inspector's test
drops. 1". While causing property damage flow would not have
caused system to fail to control fire. Would larger hose stream
supply pipes failures cause inadequate flow to remain in system?
Hmm. I don't know that 13 identifies a goal. Sufficient
post-earthquake integrity to control fire? Or very few failures
causing property damage?
See wikipedia, Nisqually earthquake. Silty, with some layers of
muck, soils of the Kent valley.
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