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Old 10-07-2010, 12:41 AM
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AJinNZ AJinNZ is offline
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Default Tinning help

As I now have a bunch of dogs, and the price of dog food has gone from silly to outrageous.....I am going to make my own.

I have a wood fired boiler arrangement I can use. Was looking around for a stainless container but couldnt find anything big enough and getting one made will be expensive.

I have several used water heaters and have the inside copper cylinder out of one, which is the perfect size. What I want to do is tin the inside so it doesnt give any problems with what I cook in it.

I can get sticks of pure tin, or paste which is ground tin with the flux in it. The fella I spoke to said the flux washes off with soap and water after the job is done. He said I would have to use flux with the solid bar tin anyhow.

I might have this all wrong, but I am sure I read something somewhere that said to just heat the copper and let the chunk of tin roll around and deposit a film all over. Just like butter in a frypan. It didnt mention flux.

Do I need flux if the copper is clean?

Is flux toxic?

If I do need to flux, can I use something that is not at all toxic?
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Old 10-07-2010, 09:41 AM
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Lu47Dan Lu47Dan is offline
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AJ, when we put together a copper potable water system we use flux while soldering the joints. After the system is in operation the flux gets flushed out of the system by the water. A few systems we have installed required the cold water side to be flushed with hot water. The flux will wash away in hot water.
If soldering an open vessel the vessel can be washed with soap and water to remove the flux.
Just do not gob the flux on, you just need a light coating over cleaned copper to do the job. Self tinning flux makes the job easier. On copper above 2" you need to tin the pipe before soldering. You still need to flux it before you tin the joint, flux removes the last of the impurities from the surfaces of the joint.
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Old 10-08-2010, 06:34 AM
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Thanks for the info Dan
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Old 10-08-2010, 01:20 PM
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copper has been cooked in for years and never gave a problem so i don't understand why you want to tin it.
When we do apple butter in copper kettel we just use salt, lemon juice or vinegar and scrub it clean before use.
Now if you don't clean the copper and OOOOHHHH lets say " cook" a clear liquid in it, it will turn blue " copper sulfite".
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Old 10-08-2010, 03:21 PM
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It was more to make sure that it wouldnt cause a problem.

Too much copper in the system of a person can cause Wilsons Disease. That comes with personality changes, which is fine when you can ask questions and work out what went wrong, but with a pooch........

As they will have their daily food cooked in this thing I decided to play it safe.
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Old 10-08-2010, 05:31 PM
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LW Hiway LW Hiway is offline
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Quote:
As they will have their daily food cooked in this thing I decided to play it safe.
AJ, some years back I was looking for cheaper(as I'm somewhat cheap) s/s tanks etc for a few projects and after pulling hair at not finding anything ready made, I was turned on to 'used resturant and school type kitchen s/s benches, warmer pans etc etc.

With having s/s ability with MIG and TIG here at the shop, I was able to make some pretty nifty cooking items out of very nice 'kitchen/cooking grade S/S items.

On one trip up through East Texas, I happened upon a scrap dealer in the piny woods that dealt with aircraft scrap etc. I picked up two 40 gallon s/s thin walled potable water tanks that made some very nice bbq pits and 30 gallon hydraulic tank of .128" wall that has become the 'premo' of crawfish boiling pots. All bought very cheaply during that cold and snowy winters day of rummaging around the yard with the self-professed 'old coot' owner operator.

Just a thought. BTW, I'm with Boilerman on this one. Just cleaning after each use should keep you safe, especially knowing what the copper tanks previous life involved.
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Old 10-09-2010, 04:38 AM
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LW, I am cheap too.

Comes of having no money for a while. Being poor sucks but it does make for a good bit of creativity.

I have some stainless shower trays that are good material, but no MIG or TIG. I wouldnt like to bet on my arc welder or my abilities with such thin metal either.

The aircraft scrap is a good idea. No idea where our dead planes go to but I might try and find out as there could be some good stuff to be had.

The cylinder I was going to use is a little too big in diameter, so am taking apart a smaller model.
The bigger one I will set up to work off a woodburner to heat water and put it inside two 44 gallon drums with fibreglass insulation. When I move and get a new shop it can be hooked up there and become a second source of hot water.
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