Most plumbers today no longer use coper "pipe" or TP copper as the cost is to high=What plumbers and HVAC and other trades use is Copper tubing types K, L, M, DWV, ACR=
for electric / heating / DWV / domestic potable water supply
Yes, this happens quite often in older houses, copper pipe can be threaded; thus one can join them and there are several fittings that can be utilized.On the other hand, copper tubing (K, L, M, and DWV) can be joined depending on which of the following application method is used:For copper tubing to galvanized water supply, one would use a dielectric nipple or union to prevent electrolytic action from taking place or dezincification of the galvanizing pipe.If these lines are for waste or venting, the Mission Rubber Company LLC has various types of couplings that can go from tubing OD to pipe OD without the dangers of mixing ferrous and nonferrous metals .For copper tubing to IPS you can solder, braze a male adapter and use the dielectric union, use a copper x galvanized dielectric union, or copper by female adapter and a dielectric nipple .If your connecting to a Durham system and the galvanized pipe has a Tucker coupling or a Kennedy tee wye, then you can use lead and oakum without the fear of mixing dissimilar metals as the lead is nonferrous metal but has no adverse effect with galvanized or copper pipes.
=== === By the way I doubt very seriously your using copper pipes your using copper TUBING
Copper tubing solder "Solder" is an erroneous term as solder mean lead which of course is banned (safe water drinking act) Sweating is another term for "soldering" Copper can be joined by various alloys such as 95 % tin -5% Anatomy or one of the many silver bearing types of low temperature alloys. For the strongest possible joints brazing is the best way to go with a tensile strength over 87,000 PSI compared to soft solder joints of 16,000 PSI For DWV copper joints one can use one of the lead tin solders such as 50 -50 as it is quite easy to work woth.
You use a compression fitting or something like a Sharkbite.
yes of course you can im a professional plumber and i had the same problem
Nope Id use type L straight tubing with soldered joints
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.
It is tricky but u can with a fernco if the copper dwv drain line is 1 1/2" in diamater use a 1 1/4" x 1 1/2" reducing fernco because the outside diamater of copper is smaller than abs or PVC
I believe it has to be flared as compression is not approved
Water lines or waste?If it is waste or vent lines you can use a water Jetter that will scour the lines to a like new condition