Chris,
I'd suggest you call the individual who made the proposal for this
change, which was voted down in it's original language at the ROP, and
then revised, and adopted at the ROC. There's a fairly lengthy set of
explanatory notes in the ROC. See ROP 13-479, Log #298 which was
rejected, and ROP 13-312, Lot #280, which was accepted in principle.
I thought it had a problem when I read it, but what do I know. The
wording that troubled me was "point of connection of the branch line
furthest from the source." That just didn't make much sense.
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
On 3/13/2013 2:46 PM, Cahill, Christopher wrote:
Not what you think by the subject. Working out of NFPA 13 '13 23.4.4.1.1.5.
This is new and confusing us greatly.
I have a 20,000 sq.ft. heated LH building. And a 2,000 sq.ft. area that needs a
dry system. Not an auxiliary dry system. My starting required design is
0.1/3,900. I calc the system at 2,000 sq.ft. (cuz that's all I have) and get
for discussion sake 220 gpm. Then I subtract from 390 (3,900 x 0.1 per
23.4.4.1.1.5) and I get 170 gpm. Then I go back to the calc and redo but this
time I add 170 at the end of the main. Now this has the effect of overflowing
all the rest of the BL's such my final calc is more than 390.
!@#$^#
What if I have a 500 sq.ft. building and the next building is 20 miles away
@#$@# are we calc'ing this extra area for?
Can someone 'splain if we got it right and then why in the world this got into
the standard?
Chris Cahill, PE*
Senior Fire Protection Engineer, Aviation & Facilities Group
Burns & McDonnell
8201 Norman Center Drive
Bloomington, MN 55437
Phone: 952.656.3652
Fax: 952.229.2923
[email protected]<mailto:[email protected]>
www.burnsmcd.com<http://www.burnsmcd.com/>
Proud to be one of FORTUNE's 100 Best Companies to Work For
*Registered in: MN
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