I think (and that's dangerous so take it for what it's worth) that you're on to something with the rack storage concept. You've got two tiers of racking at less than twelve feet. Just how combustible is a car and how will the fire likely spread? What would be the horizontal spread rate of the fire (car to adjacent cars, the one above will be at least damaged before the sprinks respond) so how big a design area? How much surround and drown water would you need? Now I could say increase the density to OH2 and the area to 2500 sqft but that would be simply speculation on how to obtain a result. But I don't think one car on top of another is any big deal unless somebody really thinks that if one car ignites you can save every other car from damage. Even when we have a single layer we allow (and should expect) damage to anything within the design area (I figure that's about fifteen cars).
On Wed, Sep 1, 2010 at 10:49 AM, Steve Leyton <[email protected]> wrote: > Was there ever a consensus on how to deal with two-high car stackers? > I know we've discussed this and there are two obvious issues: density > and obstruction. I'm not sure that stacking changes the occupancy from > S-2 but the Ordinary Hazard Group 1 thing is certainly subject to > consideration. If you consider the obstruction issue, there's really > no way to realistically get water below the upper car except drops to > below the obstruction as we'd do for doors or columns. Which isn't > viable as this particular facility will have aisles like a rack storage > occupancy. If we overlook the concept of obstruction, we could call it > solid piled storage of automobiles, but I'm not sure what class that > would be. Has anyone completed a stacker application successfully and > if so, what was the approved basis of design? > > > Steve Leyton > Protection Design & Consulting > San Diego, CA > > > _______________________________________________ > 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 Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 253.680.7346 Member: AFSA, SFPE, ASCET, NFPA, NFSA, AFAA, ASEE, 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)
