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)
