NV C-21F Chilled And Hot Water Systems Practice Questions - Nevada C-21F Chilled And Hot Water Systems Contractor Examination Exam

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On a chemically treated closed chilled- or hot-water loop, which ferrous pipe is the ordinary above-ground commercial choice?

Unlisted fence tubing with no ASTM mark Galvanized thin-wall EMT conduit ASTM A53 Grade B Schedule 40 black steel, joined by welding, grooving, flanging, or threading as listed Schedule 160 A106 steam pipe on every 1-inch branch

Correct Answer:

ASTM A53 Grade B Schedule 40 black steel, joined by welding, grooving, flanging, or threading as listed

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