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Galvanizes Piping

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StephenPelosa
StephenPelosa Member Posts: 20
I'm in Beijing China on a vacation and noticed in a museum that they used galvanized piping for a hydronic heating system. The system looks fairly new. I was wondering is this a good practice since I've never seen galvanized pipe for hot water heat. I'm just curious.

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  • hot_rod
    hot_rod Member Posts: 22,258
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    Is it threaded? I have seen stainless used also, either press, compression, or welded connections.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Gilmorrie
    Gilmorrie Member Posts: 185
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    Galvanized pipe for hydronic heating is O.K. But black steel pipe is fine assuming that oxygen is eliminated from the circulating water. Black pipe is less expensive, so it is preferred.

    For potable water, galvanized pipe is preferred over black.
  • jumper
    jumper Member Posts: 2,289
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    Hot enough water dissolves zinc oxide I think.
  • newagedawn
    newagedawn Member Posts: 586
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    galvanized pipe for domestic is not allow in US, but it can be for heating
    "The bitter taste of a poor install lasts far longer than the JOY of the lowest price"
  • ChrisJ
    ChrisJ Member Posts: 15,784
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    galvanized pipe for domestic is not allow in US, but it can be for heating

    I thought galvanized was still code compliant for domestic water?
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • hot_rod
    hot_rod Member Posts: 22,258
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    But no glycols allowed in galvanized pipes or fittings.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Danny Scully
    Danny Scully Member Posts: 1,427
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    It is @ChrisJ, maybe @newagedawn meant black iron?
    JUGHNE
  • Larry Weingarten
    Larry Weingarten Member Posts: 3,335
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    Hello, I don't remember the source, but I understand that galvanized pipe is being outlawed because sometimes lead is used along with the zinc to make it flow better when galvanizing pipe. :|

    Yours, Larry
  • Roohollah
    Roohollah Member Posts: 135
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    As for my country , as far as I know , I have just seen that galvanized pipes with diameters of 2 " inches up to 6 " inches are being used for supply water and domestic hot water in skyscrapers and some commercial high rise complex buildings . However, i have not seen this type of pipe used for hydronic heating systems . But, I saw once that an older timer heating installer had used this type of the pipe for making welded collectors in a boiler room .

    As for me , I hardly use it just for swimming pool and spa piping ,and making collectors for supply water and domestic hot water in boiler rooms .