I agree the tunnel testing is an interesting discussion. And relevant to a degree to this topic.
However, let's again look at the problem- It's ONE trailer parked in a sprinklered building with protection suitable for 14' hi Group A. How many deaths to we expect? The shielded area is likely 8' wide x 40' long, so we could probably cover most of the 320 SF area with printouts on 8.5x11 paper of these posts. In modular home plants, we have dozens of these combustible structures, so we use a 3 or 4k SF MRA. Here we have a 320 SF problem to address, hence my original thought of putting an extra head down and pointed in the back of the trailer. glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of å... .... Sent: Thursday, January 07, 2010 10:17 AM To: [email protected] Subject: trailer parked inside No. A non-sprinklered fire will be smaller than a sprinklered fire. But, the scenario described where a trailer is parked wholly-inside a building seems to have some details of interest. 1. The trailer prevents most brake and engine area ignitions from involving the transported goods, at least for 5 - 10 minutes in light walled trailers. 2. The trailer walls enable flashover 3. Flashover would entrain sprinkler droplets into the trailer 4. The trailer walls/ceiling would shield direct sprinkler spray from reaching the fire. 5. Light walled trailers (rental truck style) will have walls/ceilings that fail to flashover exposure in a short time (5-10 minutes) 6. Once the trailer walls fail, the fire is no longer ventilation limited, but it also is exposed directly to sprinkler water and subsequently will be contained. However, in the case of the tunnel test (or in the case of trailers parked inside structures without sprinklers), the lack of walls now gives the fire all the air it needs to grow to a size which has been measured to grow 10-20 times bigger). 6. Heavier walled trailers and steel containers will shield the trailer fire from direct sprinkler spray for the fire duration. With the overhead sprinkler system and inside-parked trailer scenario as described, a fire burning solid commodity inside the trailer would not extend further than the immediate vicinity of the trailer. While the trailer walls/ceiling are still intact, the fire will continue burning, albeit at slightly lower strength. Spill control around the trailer would be a favorable factor. scot deal excelsior fire _______________________________________________ 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)
