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Black pipe vs Galvanized Author: Fixitangel (NC)Just curious: What makes black iron gas pipe black? Why is it more suitable for gas service? (as opposed to galvanized? Is it heat-treated? Is it ever ok to use a black iron fitting on a potable water system? Thanks.
i was told the zinc coating on galvanized pipe could flake off ond cause problems with gas.
only time black iron is OK on potable water is when using a nipple and cap for a test/stubout.
1.The process it goes through. 2.It's cheaper to use. 3.Never!
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iron pipe is black because that is what color iron is!
As packy said, there used to be concern that the galvanized coating would flake off. Somehow they weren't worried about that in galvanized water pipe.
Some Natural Gas suppliers had a sulfur content of higher then .06% in there product and this is what could cause the Galvanize to flack off and plug gas appliance orifices. Because of the up-graded processing and industry standards we usually don't have to worry about that today.
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black iron is more suitable for gas than water because gas does not make it rust from the inside.
although not used as a primary type of piping there is nothing against using galvanized pipe other than it can flake and thus clog the lines and is more expensive. the fuel gas code allows its use, if i am not mistaken
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Pipe is "black" because it is not galvanized. ANY black pipe or fitting in contact with water will rust. Causing "red" water" or failure of the part, and eventually both.
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If you take a wire wheel to black pipe, the black comes off and will reveal pipe the color of steel. I'm not sure what the black is, but it's probably paint to keep it from rusting on the shelf. I'm not sure what the iron content is either, but I bet it's mostly steel.
I assumed it was painted to prevent rusting, but it is the same color as steel plates, whatever it is.
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