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One pipe steam system adding cast iron base

oopsplumber Member Posts: 14
I understand I need to pipe it like a two pipe system. One supply and then a return connected to a wet return.

Two questions:

1. Do I need a steam trap?

2. I assume I need an air vent?


  • Dave0176
    Dave0176 Member Posts: 1,177
    No steam trap needed, yes you need an air vent. You can also pipe the second pipe down a minimum of 5' then back up into the main, if you dont have a wet return. This creates a water seal and you won't get hammer.
    DL Mechanical LLC Heating, Cooling and Plumbing 732-266-5386
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  • oopsplumber
    oopsplumber Member Posts: 14
    At the end of the original run right after the main vent the main the pipe run drops vertical about 5 feet then returns back to the boiler.

    I am going to cut a tee in on that vertical drop about 3 feet below the main and have the bullnose pick up my radiator about 15 feet away.

    Does this sound like an acceptable plan?
  • Fred
    Fred Member Posts: 8,542
    In that case, Where it is attached to that vertical drop, it has to be below the waterline.
  • oopsplumber
    oopsplumber Member Posts: 14
    Ok. Thanks

    Last question:

    Do I bring my supply in the top tapping on the rad or the bottom tapping opposite the return?
  • Eric_32
    Eric_32 Member Posts: 267
    Supply in the top, return out the opposite bottom end of the cast iron base,