It is not a good idea to use copper pipe with natural gas as any sulphur compounds in the gas can cause an oxide to form in the copper pipe.
Often copper is used with propane. In these instances, soft copper tubing is usually used with compression fittings. The tools required are, pipe cutter and 2 wrenches.
No. You can use flared fittings with a flaring tool and soft copper pipe.
Not sure what you mean by pressure fittings. Threaded fittings for steel pipe are pressure fittings. Steel pipe with a 3/4" O.D. is known as 1/2" I.P.S. (Iron Pipe Size) pipe.
If it is leaking at a fitting, it is either a bad flare or it isn't tight enough. Gas or flare fittings should be put together dry, Do no use pipe dope because this can cause a leak between the mating surfaces. If it is in the line itself, either replace the line or cut it, flare the ends and put a fitting in.
Most codes do not allow Galvanized piping/fittings on gas piping. I have used galvanized pipe/fittings on exterior gas piping before in the state of Michigan but other states do not allows this. Check with your local code authorities.
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No, proper pipe dope that is approved for gas installations must be used on all threaded fittings. Using substitutes will not guarantee that a tight fit will be made which can lead to gas leaking into the house.
Natural gas and Propane are run through copper, using flared fittings or sticks of silver solder for brazing. To be done by a licensed professional gas fitter!!!
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No. For poly pipe they make specialty quick connect fittings that may/may not be approved for use in your area. But for metal pipe, there is no acceptable pipe connection except threaded. This is California plumbing code.Your area may differ.
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the work of a pipe fitter 2 : a piece (such as a coupling or elbow) used to connect pipes or as accessory to a pipe Examples of pipe fitting in a Sentence Astral PVC Pipe is known for its flawless finish and high quality
Check your local codes as some areas wont allow copper and require schedule 40 piping and fittings