It's still pipe. As a plumber/pipefitter/gasfitter, I still thread pipe, I still solder pipe and I still work with welded pipe on the commercial projects. Big thing is there is typically not any steam on these projects unless they are big. I was on the Shepard Energy Center here in Calgary, but had to be there as an apprentice steamfitter, not a journeyman, even though I am a journeyman plumber/gasfitter.
There is no such thing, in Alberta at least, as a "pipefitter". It's a slang term thrown around and it gets the point across. But the way most contractors, plants, and the big one is the government see it, it's plumber, gasfitter, and steamfitters.
Basically the biggest difference, steamfitters work on steam piping. The hot water heating is a toss up between the fitters and plumbers.
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