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Please help identify type of two-pipe steam system
I have a 80+ year two-pipe steam system that does not appear to have any traps (pictures attached). The name on the radiators is "The H. B. SMITH CO.".
- Does the radiator not have a trap, or is it a Return-Elbow-Trap aka Vapor Orifice?
- There does not appear to be an F&T Trap on the system (plumber also did not find one). Is that an issue, or are some systems designed this way?
- The main supply line and dry return are linked by this U shaped plumbing in the attached picture(sb vertical with water at bottom of U). Note that the piece of insulation covers a pipe to a radiator. The main supply line makes a big linked circle around the perimeter of the basement, but does not run directly into a dry return as I see in books. What is u-link for( perhaps a way for trapped condensate to easily return to boiler)?
Thanks in advance for your help!