(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 9 of 9

Thread: Black Pipe

  1. #1

    Default Black Pipe

    I know that black pipe is used for gas and hotwater applications, but why? Why can't galvanized steel be used? Thanks again for your expertise.

  2. #2
    Master Plumber Dunbar Plumbing's Avatar
    Join Date
    Apr 2005
    Location
    Northern Kentucky/Greater Cincinnati Area
    Posts
    2,943

    Default

    Natural gas is reactive to the galvanized used in coating the pipe which therefore causing "flaking" inside the pipe. In my area you cannot use galvanized for this reason, even though the gas utility states that "their" gas doesn't do this. There are tons of gas lines and fittings that have galvanized mixed with black iron. Not too often have I heard of clogging directly to this stuation. Not a myth, just a code that covers the "what if".
    Read what the end of this sentence means.

  3. #3
    I&C Engineer (mostly WWTP) Lakee911's Avatar
    Join Date
    Aug 2005
    Location
    Columbus, OH
    Posts
    1,328

    Default

    IRCC, Black Iron Pipe typically isn't used for potable-water applications. Gas, Oil, Air--yes. Galvanized typically is for water, and a poor choice at that.

    Jason

  4. #4

    Default

    So, galvanized pipe is used only for water service, because if used with gas, there is a chemical reaction of flaking, which causes clogs and reduced strength of pipe. Is this correct???

    Thanks Guys!

  5. #5

    Default

    It is my understanding, after talking to folks at PGW (Phila Gas Works), that the non use of galvanized pipe goes back to the early 20th centry and no longer applies to current gas. But, is still written into codes, which have never been updated.

    Paul

  6. #6

    Default

    Apparently in some cities and states black pipe does not need to be used for gas. I live in Chicago and black pipe is sold everywhere (city & suburbs) for the sole purpose of gas applications. This is confusing.

    Thnaks for all the input.

  7. #7
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    Here any gas pipe exposed to the elements MUST be galvanized; not allowed underground, of course.

  8. #8
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Location
    Yakima WA
    Posts
    7,246

    Default

    I don't know if natural gas causes a reaction with galvanized pipe or not, but traditionally black iron pipe is used for gas. Galvanized pipe is legal for water but is not a good choice at all. Generally copper is preferred for water although some new forms of pipe such as PEX is being used now. Black iron pipe is never used for water to the best of my knowledge.

  9. #9
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,687

    Default pipe

    These days black pipe is used for gas inside a building because it is cheaper. It has nothing to do with a reaction with the gas. Outdoors it has to be galvanized. Underground it is a black pipe with a coating, which is the poorest decision I have ever heard of, but then I am not one writing the code.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •