Joe,
It was removed prior to the 2007 edition, that's what the little dot
means between 8.6.4.1.4.3 and the renumbered 8.6.4.1.4.4.
Comment 13-145 (Log #269) in the 2006 ROC showed the reasons to delete
it, and allow the text of 8.3.4.3 to cover the issue. Our friend Cecil
was the submitter on that comment. The substantiation read as follows:
The new verbiage for 8.3.4.3 allows K-4.2 sprinklers and would therefore
allow the 4.2 k factor sprinkler in attics when the 20 psi minimum would
not necessarily be required.
Vote in favor of this comment was 29-0 in favor of accepting.
Further information on 4.2k sprinklers and galvanized pipe is also in
Comment 13-157 (Lot #240) in that same document. The substantiation for
that read as follows: The only reason for section 8.6.4.1.4.4 in the
2002 edition was to allow k-4.2 sprinklers in dry-pipe systems in this
one situation, since section 8.3.4 did not generally allow such
sprinklers. Now that section 8.3.4 has been modified by proposal 13-202,
there is no need for this section to appear in the attic rules. The
section also causes problems for wet pipe systems using k-4.2
sprinklers. AHJ’s have argued that in order to use k-4.2 sprinklers on a
wet pipe system, the pressure needs to be 20 psi. This was never the
intent of section 8.6.4.1.4.4 but the words can be read that way. The
problems are all resolved if the section is eliminated and the rules for
k-4.2 sprinklers are all in section 8.3.4 where they belong.
Vote on this comment was 29-0 in favor of accepting in principal, and
referred back to 13-145.
That's the best info I could find.
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 12/7/2010 11:19 AM, Joe Burtell wrote:
Where did this section go from the 2002 in the 2007 or 2010?
8.6.4.1.4.4 Nominal K-4.2 orifice sprinklers shall be permitted for use at
the 20 psi minimum pressure option for wet pipe systems and dry pipe systems
where piping is corrosion resistant or internally galvanized.
Best regards,
Joe Burtell, SET, CFPS
Burtell Fire Protection
Phone: 406.652.7697
Fax: 406.652.7743
Cell: 406.861.4507
Email: [email protected]
Web Site: http://www.burtellfire.com
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