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steam pipe material

Jamie Hall
Jamie Hall Member Posts: 22,881
no, galvanizing is not toxic at 212. However... most of us thread the pipe, and that kills the galvanzing. Steel will rust at those threaded connections; black iron will, too, of course, but it takes a lot longer. I'd stick with the iron...
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England


  • William Faust
    William Faust Member Posts: 168
    steam pipe material

    Is there any good reason not to use galvanized steel rather than black pipe for steam supply and condensate return lines when possible? It seems that that would result in cleaner water.
  • Norm Harvey
    Norm Harvey Member Posts: 684

    Good question.

    Is the galvanizing toxic when heated to a 212 degree temp?

    I wouldn't us it fo rany of my customers but its a good question.

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  • clammy
    clammy Member Posts: 3,089
    no galv

    As far as i know galv pipe for steam is a nono sooner or later the zinc on the inside of the pipe will flake off and start to clog raditor vents ,traps ,pressuretrols and also some mech low water cut offs ,i persaonally stay away from piping steam boilers with galv use 40 scheledge steel pipe and if possible scheledge 80 nipples when possible all fitting should be cast iron but in hard cases mallable fitting will do ,on another note no copper for boiler or steam main piping wet returns are ok to do in copper but i always perferr doing them in steel with some full size tee's so over time the wet return could be easier flushed peace and good luck clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • William Faust
    William Faust Member Posts: 168
    galvanized no?

    The galvanized steel in question is a union that is located just before a new F&T trap. It was originally brass but had to be replaced. Thanks for pointing out to me that the zinc will eventually flake off and foul things up.

    Since I should get rid of the galvanized union, why was the union brass instead of cast iron. Homeowner here.
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