Dissolving broken taps

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Lew_Merrick_PE:

--- Quote from: Ned Ludd on July 29, 2010, 02:23:32 PM ---As already said CHILL, we are talking about, maybe, half a teaspoons worth of not too concentrated Nitric acid, not buckets full. You will have to find your own equivalent to a teaspoon on the other side of the pond, but you should get the idea of the quantities involved.
--- End quote ---

Ned, A suggestion of "70%" concentration was made. That's a lot more than "not too concentrated." I regularly work with hypergolic fuels, so my "measure" is fuming red nitric acid -- and I think accordingly. Garden variety muriatic acid (15% concentration of HCl) sends several dozen people to the hospital every year just in western Washington because of inhaled fumes. I was not hearing enough think safety in this discussion (at least as I see things). Concentrated acids have dangers. It is not "dangerous materials" that frighten me, it's people handling "dangerous materials" without having though things through that scares me.

AdeV:

--- Quote from: Lew_Merrick_PE on July 29, 2010, 10:14:16 PM ---
I was not hearing enough think safety in this discussion (at least as I see things). Concentrated acids have dangers. It is not "dangerous materials" that frighten me, it's people handling "dangerous materials" without having though things through that scares me.

--- End quote ---

Lew,

It's true that I've not handled concentrated acids since my school days, which is more years ago than I care to remember. It's also true that I'm not sure what acid dissolves what - I had absolutely no idea that Nitric acid would leave aluminium alone whilst dissolving steel, for example. Google helped there.

What I DO have left over from my school days is a very healthy respect for the dangers of concentrated acid, and the need to handle them with extreme caution. Not quite as much caution as you, perhaps, but I'm expecting that if you're de-scaling steel, you're using quite a lot more acid than I am...

raynerd:

--- Quote ---I regularly work with hypergolic fuels, so my "measure" is fuming red nitric acid
--- End quote ---
I can`t imagine the OP is working with the red fuming rocket propellant type! - I`m pretty convinced it`ll be good old white HNO3.

--- Quote ---Garden variety muriatic acid (15% concentration of HCl) sends several dozen people to the hospital every year just in western Washington because of inhaled fumes.
--- End quote ---

It wouldn`t supprise me that the vast majority of irresponsible people were sniffing the stuff from the bottle! ... but I did hear that 87% of statistics are made up.

Anyway...AdeV - any more progress today????

John Stevenson:

--- Quote from: craynerd on July 30, 2010, 04:21:39 AM ---
--- Quote --- ... but I did hear that 87% of statistics are made up.

--- End quote ---

I heard 88.67 but don't know how true it is ?
--- End quote ---

Ned Ludd:
Hi Lew,
If you look back to when I mentioned using Nitric acid, in the form of "cartridge case cleaner", I mentioned no specific concentration. The Delway product is already diluted and the label says it can be diluted further by up to 90% with water. This I do not consider to be 'concentrated' or particularly dangerous. I remember one teacher at school using Nitric acid to clean a Brass fitting on a book and deliberately putting some on his finger to show how safe it was! Although I personally would not do this, as the thought of it getting in a cut makes me wince. You might only think in terms of exotic compounds used upper echelon technologies but WE are talking of commercial over the counter products. I doubt in this day and age of those-who-should-know-better's paranoia, that concentrated Nitric acid is easily available to the general public because of its use in things that go "whoosh-bang-ooh-nasty". :(

So, I repeat "Chill", and stop looking for the worst and start looking for the best. Credit some people with a little common sense, you might be surprised that the majority of the population can survive even without your education or experience, both of which I respect :bow:, but please keep it "real".
Ned

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