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cast over black fittings

lchmblchmb Posts: 2,922Member
what would be the added benefit of piping a steam boiler in cast fittings instead of black iron?


  • EBEBRATT-EdEBEBRATT-Ed Posts: 5,621Member
    Nothing except you can crack the cast Iron fitting apart with a couple of hammers. But, you can cut malleable with a cutting torch which you can't do with cast iron. Malleable fittings are fine for steam. I like them better anyhow, wrenches sometimes slip on cast Iron.

    Also cast Iron rated for 125lb steam, malleable is 150lb steam

    Also, some fittings are only available in malleable, like unions. They used to make cast iron couplings, and caps don't think they make them anymore. caps are usually malleable now as well as straight couplings. You can still get CI reducing couplings. Plugs are usually cast iron from about 1" and up smaller ones are steel.

    At least that's what they stock around here
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