I'n not sure. The heat will start collecting in the space between the purlins. Then flow through the 10" space above the joists (assuming the purlins are 10" deep)and maybe even across the purlins, depending on the depth and momentum. If classified as obstructed construction, then the deflector can be upto 16" below the deck (for this example). Is that okay?
If the beam/purlin construction is obstructed construction, shouldn't there be a minimum depth before it is termed such. Take the case of wood bar joist construction. The wood top chord can be any depth, but classified as unobstructed construction. The purlins can be the same depth, and further apart (than the wood bar joists), and still be classified obstructed construction? Tony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roland Huggins Sent: October 19, 2007 2:25 PM To: [email protected] Subject: Re: ceiling heights The definition refers to BOTH issues. If you think about for a second, I suspect you'll change your position on ceilings. It's the lower ceiling that will have the higher propensity for rolling over the obstruction (like Katrina or any other female when laying down the law - of physics or anything else). The evaluation for ceiling pockets highlighted that momentum plays such a key role in initial activation/ heat flow. The higher ceiling will have lower velocities Roland On Oct 19, 2007, at 12:51 PM, å... .... wrote: > I thought the obstructed definition referred to "obstructing" > the sprinkler spray pattern. But if we are talking about obstructing > the flow of heat, as well, > > > did anyone mention entrainment height, and what effect that will have > on ceiling jet depth. if the ceiling is high enough, the jet is going > to roll over the purlin obstructions like Katrina over a levee, only > MORE so. > > definitions are good for making discussions and decisions but the > ceiling jet is listening to the laws of physics i bet > > scot deal > excelsior fire engineering > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:Sprinklerforum- > [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)
