I‘ve noticed all branch lines going from black iron to copper always have shutoff valves and usually labels but what is the code requirement for this? i cant find it in the canadian code. i could have sworn this was a required code.thanks in advance.
I've never seen black pipe connected to copper. Copper is for water. Black pipe is for gas. Copper may corrode with gas running through it.
Natural gas contains sulfur, which will eat away at copper pipe. However, some codes approve soft copper, thicknesses K and L, but never hard copper, at least, as far as I know. Best to check with your local building department. If you've got copper installed, it is probably a very good idea to have shutoff valves at the transition, because, sooner or later, the copper will get eaten away to the point that it leaks. As an aside, valves are very convenient. When remodeling or repairing, a valve can save you from having to: 1 Inconvenience everyone in the building 2 Relight all of the pilots It works the same way, only more so with water pipes.
