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Author:
Boston Lew (MA)
We are replacing a run of steam piping to several hard to reach radiators. Normal piping will require a lot of demolition. However the run can easily be done if a union were used or a left-right threaded pipe was installed. I understand that unions cannot be left behind walls. Are left-right threads allowed? My plumber says he can't get those any more. We also considered copper but I understand this is not recommended.
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Author:
packy (MA)
he is confusing gas regulations with heat piping.
ask the inspector because a mechanical permit is required in MA.
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Author:
bernabeu (SC)
for steam piping a properly assembled hidden union is a-ok
one would hope for a ground joint type from a quality brand such as (once upon a time) DART
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
packy (MA)
bernabeu, I haven't seen an American made black malleable fitting in a quarter century.
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Author:
bernabeu (SC)
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
Boston Lew (MA)
I'm not sure what you guys are saying. What is a black malleable fitting? Can I tell my plumber that a union behind the walls is okay for steam?
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Author:
Paul48 (CT)
If you have to tell him, he's the wrong plumber for the job. Steam pipes have to be done correctly, or the pipes will bang like someone is hitting them with a ball peen hammer. The old systems, when properly maintained are nearly silent and efficient. A system that has been "knuckle-headed", wastes money and ruins your sleep. I'd put a shout out in the steam section of heatinghelp.com. Beyond properly repairing your piping, you can get a steam-pros advice for the system. Best Wishes
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