Black Pipe for gas

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    • #278034
      MasterPlumbers
      Keymaster

      I have always been told to use black pipe (steel) and not galvanized pipe for connecting a natural gas supply to a heater, stove, etc.

      Does anyone have any ideas why the specification for black pipe over galvanized for natural gas?

    • #297545
      hj

      At one time, and psibly still in some areas, the gas was corrosive to the galvanized coating and it would disintegrate on the inside of the pipe and the residue would plug pilot lights and orifices. The dirt/drip leg was supposed to catch it, but some still go through. Now, however, at least in the areas I have worked, black pipe can only be used indoors. Galvanized pipe has to be installed if it is subject to weather conditions.

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