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-   -   Cutting and welding 5 gallon cornelius "corny" kegs to be smaller? (http://www.homebrewtalk.com/f35/cutting-welding-5-gallon-cornelius-corny-kegs-smaller-265188/)

thumper64 08-27-2011 08:31 AM

Cutting and welding 5 gallon cornelius "corny" kegs to be smaller?
 
My dad and I are getting all the stuff to start brewing and we're looking into storage vessels right now. Either we're going to have to bottle the beer, and that doesn't sound fun since we only have 1/2 as many bottles as needed for a 5 gallon batch and cleaning nearly 50-16oz bottles doesn't sound fun. Or, need at least one small keg and still bottle part of it.

I can get 5 gallon cornelius kegs for $30-35 shipped. The 2.5 and 3 gallon kegs are at least $100. My question is if it would work to cut the kegs, remove some amount of the metal and TIG weld the two halves back together? In theory, it should work, right? I may need another tank of gas to back purge the tank, or T off my regular tank.

Anyone know offhand what alloy the kegs are? Are they coated with anything, or just plain stainless steel?

broadbill 08-27-2011 10:56 AM

Don't bother cutting the keg, just put whatever volume what want in a 5 gallon keg and proceed as normal.

In theory it should work, but why bother? I don't know if your welds will hold pressure (i.e. if it is possible or if you are good enough of a welder to do it).

Kegs are stainless steel. Also, you will need nearly 50-12oz bottles for a 5 gallon batch, not 50-16oz bottles.

strat_thru_marshall 08-27-2011 11:47 AM

your weld would have to be 100% sanitary and pressure tight.

Why not just brew a 5 gallon batch for your 5 gallon keg? Thats what most of us do.

jeepinjeepin 08-27-2011 11:51 AM

The $30 keg is used and probably has not been refurbed. The $100 kegs should be brand new. A sanitary weld and one that looks good are two different animals. No offense, but if you are asking you probably don't have what it takes.

Beerrific 08-27-2011 12:30 PM

It can be done. The problem though, unless you know someone that will do it for you for beer or free, it will likely cost you more to have it done than it would cost to buy a new 2.5-3 gallon corny.

Discussed here:
http://www.homebrewtalk.com/f51/2-5g-keg-thoughts-cutting-one-down-16076/#post151334

Yooper 08-27-2011 01:13 PM

I know Yuri_rage did one a few years back. I remember him saying it was not easy, as the stainless for the kegs is very very thin.

PurpleJeepXJ 08-27-2011 02:35 PM

Welding may not be the right mindset. Brazing with stainless steel silver phosphate rods would be my suggestion.

beaksnbeer 08-27-2011 03:55 PM

Years ago worked at a shop that made the Bunn ice tea tanks (make great fermenters) a tight weld that is sanitary it also has to be polished inside. I repaired several cornies some of my own. If you consider cost of gas 308L rods cleaning pads, a used 3gallon corny goes under 100 on ebay...........my.02

Golddiggie 08-27-2011 04:27 PM

Rebel Brewer has brand new 3 gallon kegs for just under $90 (plus shipping). Order two and the shipping per keg is really sweet (somes to about $13 to get two shiped to me). IMO you would be better off getting properly sized kegs than hacking up larger ones.

Also, it only takes about 36-40 pint bottles for a 5 gallon batch (assuming you're actually bottling a full 5 gallons. Most of the time I would get just under 5 gallons for bottles, so I dont think I ever used three cases of the swing top bottles.

thumper64 08-28-2011 08:11 AM

My bad on the count, it'd take 40 bottles exactly if I got all 5 gallons, so more like 35-39 realistically.

I was unaware of how thin these kegs were. I was expecting a little thicker metal, like sheet metal on a car. 1/16" tungstens are small, but not small enough for that with limited means of sharpening them and polishing them fine enough.

PurpleJeepXJ, I'm looking for brazing rods but I'm seeing a lot of silver soldering stuff.


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