Kevin, since your in this neck of the woods and since you are where you are.... Acoustic ceiling grids must be seismically reinforced to the building, the tiles must be clipped into the grid, if you use flex tubing to complete the drop you must use the carrier that that goes with the drop attached to the grid and tube properly. If you have rigid drops you need a two inch hole with an ugly (according to some) trim ring so the pipe can move around in the hole. I don't believe you need any other bracing on the drop in this case but there may be something about if the drop exceeds a certain length. I am sans books so I can't look it up. Ken would know though. Also, I had meant to get back to you about the sprinklers in houses question but it just got away from me. If you care to chat give me a call.
On Wed, Mar 16, 2011 at 6:16 PM, Law, Kevin W <[email protected]> wrote: > Anything of note for rigid drops to drop ceilings with ceiling tiles? > > > Kevin Law, PE > Sr. Fire Protection Engineer > HVAC/Fire Protection, M&PE > Bechtel National - WTP Project > Ph. 509-371-3280 > Cell 509-531-5715 > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Chris Mak > Sent: Wednesday, March 16, 2011 6:10 PM > To: [email protected] > Subject: RE: supporting/bracing long drops > > Sorry - have been very busy and have not had time to read the posts, so > if my comments are out of kilter.... > > We have had two major earthquakes in the city of Christchurch, last > September and in late February. > > A report on the New Zealand's efficacy of sprinkler system seismic > design standards will be published in the near future by our Fire > Protection Association. > > One of the things that has become apparent is that on some sites, that > hard piped drops to fixed ceilings did not perform well - the ceilings > damaged/sheared the heads off. However, on the same sites, where > flexible droppers were used, no issues were noted. > > > Trust this helps > > > Regards > > > > Chris Mak | Aon New Zealand > Sprinkler Certification Manager > Level 1, 4 Fred Thomas Drive,;PO Box33-1240 Takapuna > t: +6494869761 | f: +6494860112 | m: +64274344058 > e: [email protected] > > Please consider the environment before printing this email. > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Todd > Williams > Sent: Thursday, 17 March 2011 11:17 AM > To: [email protected] > Subject: Re: supporting/bracing long drops > > I'm not going to get into the seismic debate with the clouds. That's for > the Building inspector and the building owners. I'm just going to deal > with this as an existing condition. (I believe that the last major > earthquake in NE was 1755 off the MA coast. Although there was one off > Newfoundland in 1929 that caused a tsunami along the New England coast). > I figure I need to keep the drop fairly rigid to maintain the integrity > of the system. The Flexheads should be able to compensate for any > movement. > > > At 04:49 PM 3/16/2011, you wrote: >>I don't think you need to support your drop horizontally but being from > >>the shaky side of the country I would. But then the ceiling could not >>be as described. So if you were here, the ceiling would need to be >>seismically joined to the structure. The clouds would need to be >>seismically one with the structure. The system would also be >>seismically joined to the structure so the building, system and ceiling > >>would move together. All very Zen. The flex would be rigid to the cloud > >>and absorb any stray accelerations of the drop itself, or the drop >>could be rigid to the cloud making all one. The concept is to keep all >>the parts moving in the same direction at the same time. You have >>problems when you cloud is still moving south (given your description >>this is the most lagging element in a seismic shift) when everything >>else has reversed and is moving north. >> >>On Wed, Mar 16, 2011 at 1:31 PM, Todd Williams <[email protected]> wrote: >>> I looked at a building today with 4 10ft x 10ft ceiling clouds that > need to have protection underneath. Three of them are at 12' and one at > 10'. The clouds are suspended from above on wires and are not rigid. The > suspended ceiling in the room is 22'. >>> >>> Given the geometry of the space, the only realistic way to get > protection under the clouds is to drop a line from the system above the > suspended ceiling at 22 ft. What I would like to do is to run 4 drops > down through the ceiling to a point about 1 ft above the clouds and > connect to sprinklers using 2 ft Flexheads. The drop length will be 10' > to 12' (figuring 1 ft above the ceiling. My question is how to support > the drop. My thought is an arm-over from the main to the drop with a > hanger 6" from the elbow. In addition, attach a horizontal brace from > the drop to a structural member above the ceiling. >>> >>> Any thoughts or experience? >>> >>> Todd G. Williams, PE >>> Fire Protection Design/Consulting >>> Stonington, CT >>> 860.535.2080 >>> www.fpdc.com >>> >>> _______________________________________________ >>> 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) >>> >> >> >> >>-- >>Ron Greenman >>Instructor >>Fire Protection Engineering Technology >>Bates Technical College >>1101 So. Yakima Ave. >>Tacoma, WA 98405 >> >>[email protected] >> >>http://www.bates.ctc.edu/fireprotection/ >> >>253.680.7346 >>253.576.9700 (cell) >> >>Member: >>ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC >> >>They are happy men whose natures sort with their vocations. -Francis >>Bacon, essayist, philosopher, and statesman (1561-1626) >>_______________________________________________ >>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) > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860.535.2080 > www.fpdc.com > > _______________________________________________ > 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) > > > > This communication (and any attachments) is directed in confidence to > the addressee(s) listed above, and may not otherwise be distributed, > copied or used. The contents of this communication may also be subject > to privilege, and all rights to that privilege are expressly claimed and > not waived. 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We do not accept liability in connection with computer > virus, data corruption, delay, interruption, unauthorised access or > unauthorised amendment. > > _______________________________________________ > 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) > _______________________________________________ > 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) > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ 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)
