Tom, Don't let me tell you what to do, or how to design your system, but if that were my design, and the structural engineer "signed off" on it, I'd make absolutely sure that he "signed off" in writing, and I'd keep that little piece of paper in my safe deposit box.
Just a friendly thought. 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 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. tom poisal wrote: > yeah you got it, I'll be okay, the struct engr signed off on me hanging from > my own pipe and as I suspected limited me to 7 spacing > . > > On Mon, May 31, 2010 at 6:27 PM, George Medina Jr <[email protected]> wrote: > > >> Tom, >> NFPA-13 2007, >> Sec. 91.1.6.5 All components of each hanger assembly that attach to a >> trapeze member shall conform to 9.1.1.4 and be sized to support the >> suspended sprinkler pipe. >> >> Sec. 9.1.1.6.6 The ring, strap, or clevis installed on a pipe trapeze >> shall be manufactured to fit the pipe size of the trapeze member >> >> >> George Medina Jr. >> >> >> >> >> -----Original Message----- >> From: tom poisal <[email protected]> >> To: sprinklerforum <[email protected]> >> Sent: Mon, May 31, 2010 2:43 pm >> Subject: Fwd: trapeze hangers >> >> >> ---------- Forwarded message ---------- >> rom: tom poisal <[email protected]> >> ate: Mon, May 31, 2010 at 5:40 PM >> ubject: Re: trapeze hangers >> o: [email protected] >> >> en, according to NFPA 13 (2002 handbook) I believe 9.1.1.6 is pretty clear >> n that my modulus is 0.41 thru 0.44 for 2 1/2" pipe at a span of 6' (the >> urlin spacing) and 6" sch 10 pipe is within the Table 9.1.1.6.1 (a) table, >> nd it clarifies the hanger size 9.1.1.6.5 so I use 6" rings at both ends? >> hat is what I am trying to clarify. >> >> n Mon, May 31, 2010 at 5:27 PM, tom poisal <[email protected]> wrote: >> >>> george the six inch main is directly attached to an 8" purlin, the >>> >> structural engineer has no interest in my hanging weight, as at the start >> of >> the project i was willing to give him panel point loads (weight of water >> filled +pipe), anyway it is not trapezed, the purlis are 6' o.c. so I'd >> rather keep the hose line main back against the wall like the feed >> main.....keep out of the racks way..... >> >> >> On Mon, May 31, 2010 at 5:17 PM, ParsleyConsulting < >> [email protected]> wrote: >> >> >>> Tom, >>> >>> I don't know for sure but I would believe that such an installation >>> would be outside of the listing of the rings, and I would imagine the >>> manufacturer's would not stand behind such an installation. You might >>> give one of them a call on Tuesday and ask if that's something they can >>> support, no pun intended. >>> >>> It would also seem to be at odds with the letter of the standard, which >>> requires pipe hangers to be attached directly to the structure., as >>> noted in 9.2.1.3 ('07 edition). I would also suggest that you may run >>> into structural problems with the lateral deflection of the 6" main by >>> adding loads to it that are taken into consideration, similar to the >>> lateral deflection limits that are applied for seismic bracing. >>> >>> If this is the only means you have to support the pipe I would not be >>> comfortable in using such a method unless I had a structural engineer >>> sign off on it, as noted in 9.1.1.2. >>> -- >>> 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 >>> >>> 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. >>> >>> >>> >>> >>> >>> tom poisal wrote: >>> >>>> I'm running a grid which consists of a 6" near main, 4" far main with >>>> >> 2 >> >>>> 1/2" gridded lines for a warehouse, I also have to supply several hose >>>> stations from a separate system, can I run the hose supply line (2 >>>> >> 1/2") >> >>>> direcetly below the 6" line using - 6" rings, 1/2" rod and then 2 1/2" >>>> >>> ring >>> >>>> and double up on my 6" main hanger spacing? (7' o.c.) to hang the 2 >>>> >> 1/2" >> >>>> below the grid main? >>>> >>>> >>>> >>>> >>> _______________________________________________ >>> Sprinklerforum mailing list >>> [email protected] >>> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >>> >>> For Technical Assistance, send an email to: [email protected] >>> >>> To Unsubscribe, send an email >>> >> to:[email protected]<to%[email protected]> >> <to%[email protected]<to%[email protected]> >> >>> (Put the word unsubscribe in the subject field) >>> >>> >> >> -- >> Tom Poisal, CET >> >> >> -- >> om Poisal, CET >> >> -- >> om Poisal, CET >> ______________________________________________ >> prinklerforum mailing list >> [email protected] >> ttp://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> For Technical Assistance, send an email to: [email protected] >> To Unsubscribe, send an email >> to:[email protected]<to%[email protected]> >> Put the word unsubscribe in the subject field) >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> >> For Technical Assistance, send an email to: [email protected] >> >> To Unsubscribe, send an email >> to:[email protected]<to%[email protected]> >> (Put the word unsubscribe in the subject field) >> >> > > > > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.437 / Virus Database: 271.1.1/2909 - Release Date: 05/31/10 > 18:25:00 > > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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)
