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Bullhead tees

yellowdog Member Posts: 157
I see a lot of mention on here of bullhead tees but when I see them mentioned I don't always see what I know of as a bullhead tee. I was taught to measure a tee as run run branch. A bullhead tee has a larger branch than the runs. So a bullhead tee would measure 1x1x1 1/4 with 1 1 /4 on the branch. Did I get taught wrong from the beginning? Or do some people use the term bullhead differently?


  • Jamie Hall
    Jamie Hall Member Posts: 23,323
    No not taught wrong -- just different usage of the term. As it is used here we are usually referring to a T piped so that the flow is into the branch and out of both runs.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • hot_rod
    hot_rod Member Posts: 22,158
    An example of a bull head tee. The branch connection is larger than the run connections.

    when talking about  piping installations, bull heading is as Jamie mentioned   Flow entering the branch connection and going two different directions,

    when used in hydronic piping the flow doesn’t always divide up the way you expect

    That practice used to be prohibited in codebooks, Im not sure if it is still included
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • GroundUp
    GroundUp Member Posts: 1,909
    A "bullhead tee" is the name for a tee where the branch is larger than the runs. A "bullheaded tee" is any tee used in such a manner that the branch is being fed. A 1x1x1 tee where the flow enters the branch is bullheaded. Primary/secondary piping with closely spaced tees, the supply side is technically bullheaded.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,847
    edited February 19
    This is a famous Bull Headed T

    Edward Young Retired

    If you make that expensive repair, and you still have the same problem, What will you check next?

  • Intplm.
    Intplm. Member Posts: 1,965
    @yellowdog As mentioned above you are correct and not taught wrong.

    When asking for/ordering a tee, to help prevent confusion you should describe a tee as you have said above. The word(s) bullhead helps those who are completing an order to know that the branch is larger than the run.
    If they don't get it right from there, then they are a bullhead.

  • yellowdog
    yellowdog Member Posts: 157
    @GroundUp explanation clears the fog between my ears. Bullhead and bullheaded explains it all.