I once had an old fire extinguisher, a large one, I think a 20. Not sure exactly what it was but about twice the size of a normal office one(5A-10BC etc) It was a discard from an old office building we were remodeling, expired etc, sent to the dumpster, but not put in it, just left sitting there. I eventually threw it in the car and took it home, but it wound up in the storage for about ten years, then in the barn for another 5 or so.
Eventually I was working with a guy who had once worked refilling/recharging them, and one time he was by the house and I had it setting out, and asked him what he thought about it. I had long presumed it would still been good but after he bumped it around awhile, took a rubber mallet to it, and anything else he could think of, decided the powder inside must been caked.
Prior to moving from there I had thoughts of tossing it into a dumpster, but the reading on the pressure gauge still worried me(picturing some guy on a dozer at the landfill running over and it blowing up on him). Well, I finally did the un-imaginable, pulled the pin, and then the trigger. Never test one this way, or it will be ruined for dependable use(I've heard once that powder gets across the seal they'll no longer dependably hold a charge)
Anyway, I walked to a side of the place where, if it chose to do so, it could disperse harmlessly across a wide open space. Well, it did... that thing spewed... and spewed.....and spewed....I could have put out ten major fires with that monster before it finally stopped
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