Gas PipingQuestion 239 of 360
Which material is the traditional default choice for interior fuel gas piping in residential and light commercial work?
a.PVC plastic pipe
b.Black (steel) pipe with malleable iron or steel fittings
c.Type M copper for all gases
d.Cast iron soil pipe
Explanation
Black steel pipe with threaded malleable-iron or steel fittings is the traditional workhorse for interior gas distribution. PVC and other thermoplastics are used only underground where listed for gas, not for interior aboveground piping. Cast iron soil pipe is a drainage material and is not approved for fuel gas.
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