Bill, I do not see the definition that way. I think you are reading into it to much. The Pipes supplying sprinklerS, either directly, or Through.. Sprigs, drops, etc.... It is making a distinction in the different ones, further clarified by the definitions for sprig, drop, armover., etc..
R/ Matt Matthew J. Willis Living Water Fire Protection, LLC. 1160 McKenzie Rd. PO Box 877 Cantonment, FL. 32533 850-937-1850 Voice 850-937-1852 Facsimile [EMAIL PROTECTED] ----- >-----Original Message----- ----- >From: [EMAIL PROTECTED] ----- >[mailto:[EMAIL PROTECTED] On ----- >Behalf Of [EMAIL PROTECTED] ----- >Sent: Thursday, June 19, 2008 7:57 AM ----- >To: [email protected] ----- >Subject: RE: Restraint of Branch Lines ----- > ----- >A branch line can be a single head per the definition in ----- >NFPA 13. Does this mean each arm-over, drop, or return ----- >bend regardless of length must have a branch line ----- >restraint? It seems sprigs are given special attention ----- >in Chapter 9 but the other categories of branch line are not. ----- > ----- >I guess I'm getting back to the confusion over the ----- >definition of a branch line. From the feedback it seems ----- >no one is providing restraint when a single head is involved. ----- > ----- >Bill Brooks ----- > ----- >William N. Brooks, P.E. ----- >Brooks Fire Protection Engineering Inc. ----- >372 Wilett Drive ----- >Severna Park, MD 21146 ----- >410-544-3620 Phone ----- >410-544-3032 FAX ----- >412-400-6528 Cell ----- > ----- >-------- Original Message -------- ----- >Subject: RE: Restraint of Branch Lines ----- >From: "Thom McMahon" <[EMAIL PROTECTED]> ----- >Date: Wed, June 18, 2008 4:50 pm ----- >To: <[email protected]> ----- > ----- >13 defines restraint as a lesser level of control than ----- >Brace. We have always favored the 12Ga. 440 Lb. Ceiling ----- >wire restraint on the end of branchlines (9.3.6.1 end ----- >Head) If it doesn't have heads on it, it is a feed or ----- >cross main and requires bracing. (See branchlines over ----- >2")(This includes all head types, SSU, SSP and HSW even ----- >flex heads if the last head on the line is a flex head) ----- >The new 2007 hanger with 2nd hanger at 45' angle may ----- >appeal to some. In any case when you're doing seismic ----- >the end of branchlines must be restrained.(I always try ----- >to keep my hangers less than 6" and it's a lot ----- >easier.) ----- > ----- >The more difficult restraint requirement A9.3.6.4 is ----- >when your close to other objects that can damage the ----- >branchline in a seismic event. ----- >Components of the structure, duct work or large ----- >mechanical piping. Also your always required to use ----- >restraint per 9.3.6.4 (see table) on longer branchlines. ----- >Again a little clarification that this is not ----- >cumulative, it is based upon the smallest pipe size in ----- >the branchline.(13 HB committee, yes or No?) (Part of ----- >this answer depends upon weather the other trades are ----- >providing seismic bracing, and a good feel for how close ----- >is too close, NOT YET DEFINED BY 13) ----- > ----- >Example:( A branchline which follows pipe schedule sizes ----- >with every head 12' from the last with a 21/2" starter ----- >piece, and 10 heads total. ----- >(112'-0" total length) you have your end restraint, the ----- >with a Cp 0.58 you space your next restraint 38' from ----- >the end one. Then since your now on a 11/2" piece of the ----- >branch line do you space 38' again or 43'? The end ----- >answer is it doesn't really matter, you need the end on ----- >plus two more either way, but I see both sides of that, ----- >and it's not real clear.) ----- > ----- >Thom McMahon, SET ----- >Firetech, Inc. ----- >2560 Copper Ridge Dr ----- >P.O. Box 882136 ----- >Steamboat Springs, CO 80488 ----- >Tel: 970-879-7952 ----- >Fax: 970-879-7926 ----- > ----- > ----- > ----- >-----Original Message----- ----- >From: [EMAIL PROTECTED] ----- >[mailto:[EMAIL PROTECTED] On ----- >Behalf Of [EMAIL PROTECTED] ----- >Sent: Wednesday, June 18, 2008 12:54 PM ----- >To: [email protected] ----- >Subject: Restraint of Branch Lines ----- > ----- >2007, 9.3.6.3 - The end sprinkler on a line shall be ----- >restrained against excessive vertical and lateral movement. ----- > ----- >1. Can I assume the word line means "branch line" based ----- >on the title of 9.3.6? ----- >2. Would the end sprinkler include sprinklers on drops, ----- >arm-overs, and return bends? ----- >3. Would "excessive" be defined as using a restraint not ----- >listed for vertical and/or lateral movement or not ----- >meeting 9.3.6.1(5)? ----- > ----- >Someone has asked me to approve a particular brace but ----- >then I realized I had no idea how many needed to be installed! ----- > ----- >(Getting old but still learning) ----- > ----- >Bill Brooks ----- > ----- >William N. Brooks, P.E. ----- >Brooks Fire Protection Engineering Inc. ----- >372 Wilett Drive ----- >Severna Park, MD 21146 ----- >410-544-3620 Phone ----- >410-544-3032 FAX ----- >412-400-6528 Cell ----- > ----- > ----- >_______________________________________________ ----- >Sprinklerforum mailing list ----- >[email protected] ----- >http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum ----- > ----- >To Unsubscribe, send an email ----- >to:[EMAIL PROTECTED] ----- >(Put the word unsubscribe in the subject field) ----- > ----- >_______________________________________________ ----- >Sprinklerforum mailing list ----- >[email protected] ----- >http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum ----- > ----- >To Unsubscribe, send an email ----- >to:[EMAIL PROTECTED] ----- >(Put the word unsubscribe in the subject field) ----- > ----- > ----- >_______________________________________________ ----- >Sprinklerforum mailing list ----- >[email protected] ----- >http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum ----- > ----- >To Unsubscribe, send an email ----- >to:[EMAIL PROTECTED] ----- >(Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
