Thanks Ken!
/Thank you,
Bob Knight, CET III//
/*/Fire by Knight, LLC/*/
//208-318-3057/
FIREBYKNIGHT
On 5/9/2026 11:19 AM, Parsley Consulting wrote:
Bob,
I reviewed §18.5.6.1 which tells me that as long as the overall length
of the branch lines you're longitudinally bracing don't exceed 80'
overall, and §18.5.6.4 which lets me know what the end of the pipe to
the longitudinal brace doesn't exceed 40' the single longitudinal
brace on the branch line would permit the weight of the water filled
branch line to be omitted from the Fpw on the main, per §18.5.9.6.
From the sketch you've provided, I would conclude the single
longitudinal brace on each branch line would permit the omission of
that load against the main.
sincerely,
*Ken Wagoner, SET*
*Parsley Consulting
3002 Younger Drive
Harrisonville, Missouri 64701-3909*
*Phone: (760) 745-6181 *
*Visit the website
<https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.parsleyconsulting.com%2f&c=E,1,Y5zKJKPEh1mBEBqSR-VE9cUKl5y-eyP8BpvmE_5j9ZqW2eJbNphYzrCMBZ-2YuX6d-RRkHI4gQ1FV-cvOeCfRC58uZS9NiToZv2mx7909oCqLvCW_n5hDHeK&typo=1>
*
On 5/6/2026 10:03 AM, Bob Knight wrote:
I have a situation where there is a high Cp value of 1.17. The
project is an old wood structure requiring
seismic bracing. There is noway to brace this without adding
longitudinal braces to the branch lines.
NFPA 13 (2025), 18.5.9.6 The zone of influence for lateral braces
shall include all branch lines, drops, sprigs, and mains tributary to
the brace, except branch lines that are provided with longitudinal
bracing.
My question is, can one longitudinal brace that would span both sides
of the cross main satisfy the requirement?
The brace will be within 40' of either end and will calculate for a
80' long zone of influence.
As well, the riser nipples will be included in the lateral brace
calculations per 8.5.9.6.1.
--
/Thank you,
Bob Knight, CET III//
/*/Fire by Knight, LLC/*/
//208-318-3057/
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