You are allowed to move up to 1-ft. to avoid obstructions to discharge, either along branch lines, or between lines, but not both at the same time.
Jeff Hewitt, PE, SET, SFPE (Professional Member) Corporate Engineer Bi-State Fire Protection Corporation 241 Hughes Lane St. Charles, MO 63301 636-946-0011 636-946-5172 (fax) 314-574-6989 (cell) Fire Sprinklers Save lives. Can You Live Without Them? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ken Holsopple (forum) Sent: Thursday, June 25, 2009 12:49 PM To: [email protected] Subject: ESFR Spacing NFPA 13 2002 vs. 2007 Dear forumites, I have a situation on a building where have have been contracted to do the addition. The building is 40'+ at the peak. The existing and new building are all protected (to be protected) with ESFR. The problem is that the existing layout consists of several places where the branchlines (running perp. to the bar joists) are spaced greater than 10'-0". The increased spacing runs anywhere from 10'-1" to 10'-9". Each of the existing sprinklers does not exceed the 100 sq. ft. In reading NFPA 13 ('02) Section 8.12.2.2.3 I see that an additional 1'-0" is allowed along the branchline when trying to miss obstructions created by trusses/barjoists as long as the listed criteria is met. Note that this only allows moving ESFR ALONG the line. No mention of increased spacing between lines till you get to Section 8.12.2.2.4. But this section only applies to running parallel with the steel. I will also note that the equivalent in the 2007 edition expands 8.12.2.2.3 to include wind bracing (what I would call x-bridging and/or Horizontal Bridging). But it still states that sprinklers can only be moved along the line. The GC would like us to continue with the spacing of the original layout. I am resisting. My contention is that no matter what, the distance between the branchlines should not exceed 10'-0". Am I right in questioning the additional spacing between the lines or am I being to literal in my interpretation? Best Regards, Ken Holsopple Designer Rowe Sprinkler Systems, Inc. _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
