Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

swing joint

good evening. what exactly is a swing joint. thanks


  • swing joint

    here is a small one on my boiler reservoir tank. the benefit is that the joint can absorb any expansion, and contraction forces, by allowing a twist at the joint.--nbc
  • Swing Joints in the Exit Risers

    A swing joint is a series of elbows and pipe nipples that allow movement between parts. It's like a universal joint on a car's drive shaft. With steam you probably ran across the term with regard to header piping.  Residential boilers are made up of sections which are bolted together (they look like slices of bread bolted together) The end sections have the steam risers attached to them. If the header that joins these end sections is rigid, when it expands, it puts undesirable  pressure on sections and the joints between the sections. Adding elbows (swing joints ) to the risers allows for movement  and therefore is less likely to cause damage to the boiler. (See attached drawing)

    - Rod
    STEAM DOCTOR Member Posts: 1,308

    found great article on this topic by Noel Murdoch.
  • vaporvac
    vaporvac Member Posts: 1,520
    edited April 2013
    Great Link!

    Just want to say thanks for sucha great link to the article by Noel Murdoch. It really helped clarify a few things for me. In fact, the entire site is a gold mine of info.
    Two-pipe Trane vaporvacuum system; 1466 edr
    Twinned, staged Slantfin TR50s piped into 4" header with Riello G400 burners; 240K lead, 200K lag Btus. Controlled by Taco Relay and Honeywell RTH6580WF
  • Steamhead
    Steamhead Member Posts: 14,324

    is one of the best. 
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!