Thanks for the clarity Kyle.
Now I'll have more confidence about it.
Brad.
Quoting "Kyle.Montgomery" <[email protected]>:
You have to start somewhere. So whether you 'tentatively' space them
at 40 feet or less than that, you have to run a calc and then check
it against those tables. Just like with hydraulics, you get better
at guessing where to start the more often you do it.
You are right about going from one size main to another, you always
to double check against the chart. Often we find that it is less
costly to upsize a main from, say, 2-1/2" Sch 7 to 3" Sch 10 because
you can save on the bracing.
Also, keep in mind that if you use lighter wall pipe (such as Sch 7,
Eddyflow, Dynaflow, etc.) that you either need to use the Sch 5
table or get the data from the manufacturer. In my experience, it is
worth it to use the manufacturer's data because it is way more
robust than Sch 5.
Kyle Montgomery
Aero Automatic Sprinkler Co.
21605 N. Central Ave.
Phoenix, AZ 85024
Direct: 623.580.7820
Cell: 602.763.4736
[email protected]
-----Original Message-----
From: Sprinklerforum
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Monday, November 27, 2017 12:16 PM
To: [email protected]
Subject: [EXTERNAL] Re: Quick swaybrace calc question
Thanks Ken, yes, I understand this.
And I understand the zone of influence and so forth.
But these Max Load Tables threw me when I got into them more- they
seemed 'backwards'. In terms of calcing the loads in the Z.O.I., the
40' spacing will be greater than the 20' spacing. But I read
Appendix E and figured it had to due with pipe deflection, not just
total weight. So If these tables apply I cannot 'tentatively' space
lateral braces at 40'. And I cannot know my calc for 4" main at 40'
works and assume my 2.5" main at 40' works because it is 'less
demanding'.
I hope this makes sense.
thanks again,
Brad
Quoting Parsley Consulting <[email protected]>:
Brad,
Perhaps a better look at the form is in order.
The form template can be used for either longitudinal or lateral
seismic bracing.
Should the form be used for calculating the longitudinal bracing Fpw
the limitations in 9.3.5.5.2 do not apply. The clarification of this
is provided in the text of the section which notes, in part,
"_*Lateral*_ sway bracing shall be in accordance with either Table
9.3.5.5.2(a) through Table 9.3.5.5.2(l)..."
As I am a member of the hanging and bracing committee please see the
disclaimer below.
sincerely,
*Ken Wagoner, SET
*Parsley Consulting***
*350 West 9th Avenue, Suite 206
*Escondido, California 92025
*****Phone 760-745-6181*
Visit the website
<http://secure-web.cisco.com/17PcVWmbS7XM7PrloyKHHeDdU-OXeudygwp52YcFP
HYjAw2gjLUc2kV6L9_jwnj573IRSyKPY6skje5vfIje1QTXTh_C1zVqwN4aAiVDpUbPHx4
Eo3lAy8I71dKi1a1ZM4AVANcee8J9HjYjgDQj3Y5Vym2pmmHY08bXVUUKj8LV6RvclwYEh
716f6LipsLjDpIbDiJlWBinSyHwAVOUVYRtazQhtyjEXvTl4_B4vpseD44xK757uB0XpWp
nd-puXWSE-FhgDh295OWiNgTLERw/http%3A%2F%2Fwww.parsleyconsulting.com%2F
> ***
*IMPORTANT NOTICE: This correspondence is not a Formal Interpretation
issued pursuant to NFPA Regulations. Any opinion expressed is the
personal opinion of the author and does not necessarily represent the
official position of the NFPA or its Technical Committees. In
addition, this correspondence is neither intended, nor should it be
relied upon, to provide professional consultation or services**
**
**It should be noted that the above is my opinion as a member of the
NFPA Automatic Sprinkler System Hanging and Bracing Committee in
accordance with the NFPA Regulations Governing Committee Projects and
should therefore not be considered, nor relied upon, as the official
position of the NFPA or its Committees*
On 11/27/2017 9:15 AM, [email protected] wrote:
Please refer to NFPA 13 (2016).
Figure A.9.3.5(b) is a sample sway brace calc.
at the bottom it says "Maximum Fpw per 9.3.5.5.2 (if applicable)."
My question is--
are those max load tables based on lateral brace spacing ever NOT
applicable?
thanks,
Brad
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