Subject: Honestly, nothing.
Author:
Posted on: 2013-12-12 09:29:00 UTC

I don't even work at that particular site. But the equipment in question is part of an electrolyser, which splits salt water into chlorine, hydrogen, and sodium hydroxide (or 'caustic'). Normally it then releases the hydrogen to the air (because it's light and harmless), and reacts the chlorine with the caustic to make bleach.

Thing is, we added a new system, one that would take the hydrogen and chlorine and make hydrochloric acid. To get it to work, we had to skim off a little bit of the chlorine, which left an excess of hydrogen. We then scrubbed the removed chlorine, leaving only the tiny amount of oxygen that's in it... and then piped that oxygen into a confined space with the hydrogen excess.

Yeah - that wasn't too bright. We used to have a 2-storey tank of caustic - now we have bits of said tank. Turns out hydrogen + oxygen = bang.

(The reason we did this? No-one bothered to think about where the excess hydrogen would go. They/we just sort of assumed it would vanish into the ether. Oops)

hS

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