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Old steam trap ID

I live in the Detroit suburbs and my house was built in 1928. My system has always had some steam hammering but lately it has been getting worse. It only happens for a few minutes on startup and according to Dan's YouTube videos that is an indication that some of the steam traps are not working properly. The capsules look fairly easy to replace but I can't seem to find out what type of steam traps are on the system so I can buy the right replacements. They are brass. Can anyone identify them from these pictures?





Thanks for the help.

Comments

  • Steamhead
    Steamhead Member Posts: 16,714
    The insides look like Hoffman, but I can't read the lettering on the cap to verify that. Can we get a close-up?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
    Mad Dog_2
  • Mad Dog_2
    Mad Dog_2 Member Posts: 6,692
    Looks like maybe a first generation 17 C. Mad Dog
  • JUGHNE
    JUGHNE Member Posts: 11,021
    A little wire brush work on the cap will usually tell all.
    Petemcl
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,297
    Some sandpaper on the cap or on the trap should reveal a name or #
  • Mad Dog_2
    Mad Dog_2 Member Posts: 6,692
    Sometimes..the real old ones don't always have a raised bossing.  Mad Dog
    reggi
  • Petemcl
    Petemcl Member Posts: 5
    OK. Thanks for the help. After cleaning off years of baked on lead based paint I found that it is a Hoffman #18. Now the question is how does it work as there are no bellows and more importantyly where can I find a replacement capsule for the best price (I have 17 of these to replace).


  • mattmia2
    mattmia2 Member Posts: 9,398
    Is that a carbon post type trap? Tunstall or Barnes and Jones should have modern guts that fit it.
    Petemcl
  • Mad Dog_2
    Mad Dog_2 Member Posts: 6,692
    B & J OR Tunstall.  Can't go wrong. Mad Dog
    Petemcl
  • Gordo
    Gordo Member Posts: 852
    Here's a video on the Hoffman #18 trap

    https://www.youtube.com/watch?v=NBwuK7iznUY
    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.
    https://heatinghelp.com/find-a-contractor/detail/all-steamed-up-inc
    PetemclshakingthroughJUGHNE
  • Steamhead
    Steamhead Member Posts: 16,714
    Petemcl said:

    OK. Thanks for the help. After cleaning off years of baked on lead based paint I found that it is a Hoffman #18. Now the question is how does it work as there are no bellows and more importantyly where can I find a replacement capsule for the best price (I have 17 of these to replace).

    Thought so. This is a Hoffman Vapor system. Is there, by chance, a Differential Loop in the basement near the boiler?

    ISTR the Tunstall repair kit may require replacing the cap on each trap. Their website was not specific though. The Barnes & Jones one can use the existing cap, which would not incur the extra cost of the cap. You'll want to check with Tunstall to be sure.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
    Petemcl
  • Petemcl
    Petemcl Member Posts: 5
    Steamhead said:

    Thought so. This is a Hoffman Vapor system. Is there, by chance, a Differential Loop in the basement near the boiler?

    ISTR the Tunstall repair kit may require replacing the cap on each trap. Their website was not specific though. The Barnes & Jones one can use the existing cap, which would not incur the extra cost of the cap. You'll want to check with Tunstall to be sure.

    Thanks. Yes, I ordered a Tunstall capsule and cap from Athena in Chicago today. I didn’t order their install tool. Will I need it?

    There is a trap in the basement that looks like it joins the steam side to the water drain side of the system. It looks different than the Hoffman 18 but it is in an awkward spot so it will take a bit of gymnastics to get to it.

    Thanks again to everyone for the help.


  • mattmia2
    mattmia2 Member Posts: 9,398
    edited February 2023
    If it was a hoffman differential system there is, or at least was, a deep u bend type of trap somewhere near the boiler that would equalize the supply and return pressure if the supply pressure got too high.
  • Steamhead
    Steamhead Member Posts: 16,714
    Petemcl said:

    .......There is a trap in the basement that looks like it joins the steam side to the water drain side of the system. It looks different than the Hoffman 18 but it is in an awkward spot so it will take a bit of gymnastics to get to it.

    That's a "Crossover Trap". Its job is to let the air from the main vent out quickly, which reduces the system's heating-up time, saving fuel. The air is routed into the dry (overhead) return and vented near the boiler. If the system has a Differential Loop, the vent is on top of it.

    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting