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On Mon, 3 May 2004 14:50:56 +0000 (UTC), Aaron Coolidge
wrote: Roger Halstead wrote: snip : With the airflow through most small aircraft I'm not sure the CO2 : extinguisher would be all that effective. I was in the engine room of a cargo ship that had a CO2 extinguisher - I would think the cargo hold would be a lot tighter than the typical small plane where the draft would blow out a match. technically called a "smothering system" activate. Let's just say that you *DO NOT* want to be anywhere near a CO2 system that's been activated. About the only one safe for a confined space is Halon. You'll choke on a dry chemical. The stuff is terrible even in an office, let alone an airplane. As I recall, two men who couldn't get out were killed. The ship's engines stopped within a minute due to lack of oxygen. I would *NEVER* shoot off a CO2 extinguisher in any kind of confined space. I once was able to put my yearly training to use when we had a fire in one of the construction trailers on site. It was Winter and very cold. They had one of the old style Kerosene stoves that were used in many homes. For safety it was set in a metal pan about an inch to inch and a half deep. Thing was probably 4 feet wide, two and a half across and maybe three feet tall. Of course it was located way back at the end of the trailer which made good sense. They had flooded it and when it started it got hot in a hurry, plus there was a good half inch (or more) of kerosene in the pan. The flames were boiling up and then following the ceiling about 20 feet to the door where they were rolling out. I had a 25# dry (Purple-K) extinguisher in each hand. I took a deep breath and went in on my knees. (standing up would not have been conducive to good health. It looked just like the training films with the flames billowing across the ceiling the full length of the trailer). I don't remember how many extinguishers the construction crew had used, but there were a bunch of them on the ground by the door. They had been trying to put out the flames instead of the fire. It took less than the one extinguisher to put out the fire, but that kerosene was boiling hot and was filling the room with fumes... fast. As soon as the flames were out, so was I. :-)) If that sucker relit it was going to be noisy. I was able to hold my breath long enough to go in, put out the fire, and get out. With the heat and fumes, breathing in there would not have been healthy. (It was Hot!) You never, ever use CO2 in any confined space. That would be pressure vessels, holes in the ground, and air tight rooms. They are fine in the normal open office spaces. CO2 does warn you though. It makes you feel like you need to breathe. It is what keys, or triggers the breathing reflex, not the lack of Oxygen. For instance with nitrogen in a confined space you have absolutely no warning. You just go to sleep. Hence the requirement for the complete harness and an outside safety man when entering pressure vessels or holes in the ground. We had a number of underground pumping stations. When I hired in, we'd just go out, open the hatch, go in and check the instruments. By the time I went back to college we couldn't even go in alone. Complete harness and outside backup were minimum. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
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