on steam piping, condensate piping SCH 80 is required and you should always use dielectric union between two different metals. The pipe is black or galvanized steel, the fittings are the same or cast. years ago there where a lot of cast fittings. Sch 80 is minimum code in most areas, for low pressure steam lines. A Dielectric coupling is required, because otherwise severe galvanic corrosion could result if the two dissimilar metals directly touched each other you also need to use eccentric reducers instead of concentric on the steam and condensate
Frodo, thanks for the heads-up on schedule 80. The check valve image is the style I inquired about.
With your question regarding the galvanized. Many manufacturers will take the black steel thread it and then dip it in the zinc. Others just dip the pipe in zinc then thread it. The bare metal threads are not a problem.
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