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I am building a new 3 torch forge after a year+ of playing around and spending a lot of cash. I ended up with Frosty's T-burner single torch forge using black pipe, floor flange and bell's. It works good but I want better. I have been thinking about the propane delivery system to use and today it entered my decision to use 1/4" or 1/2" copper pipe with copper elbows and needed parts sweated together. I searched to find if copper was a valid material to use and it appears it is a good material and legal in PA to use for a propane delivery run. They use it for the whole house propane tanks mounted outside of home because copper can go around bends very easy and the cost is quite less. The only issue I found was connecting copper to other materials can cause issue with corrosion. This is NOT and issue because copper will only be used for the delivery of the propane. The mig tip is copper that will feed propane into a 1 x 1 1/2 cast iron bell threaded into 1" inch x 6" pipe connected to a 1" x 1/2 bell that will be inserted into forge. I have done quite a bit of home plumbing sweating copper together so I see no issue with BAD sweats. I am posting this concept to get feed back from experienced forgers to see if I am heading down a dark path of a less expensive propane delivery system. Any constructive thoughts would be appreciated.