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Why is the outlet of the Barnes & Jones BJ-3BM “Big Mouth” vent threaded?

jsavagejsavage Posts: 32Member
edited September 8 in Strictly Steam
I bought some Big Mouth vents and I’m curious why the outlet is threaded. Is it to handle any water that might spit out?

Thanks!

PS I did search for this answer, but feel free to just provide a link if this question has been answered before. Thanks!
--
Homeowner from Providence, RI
Home b. 1897, one-pipe steam with a indirect gravity hot air system using Gold's pin radiators.

Comments

  • EBEBRATT-EdEBEBRATT-Ed Posts: 5,914Member
    They make the big mouth out of a trap body and trap bodies are threaded. + you can pipe the outlet to a drain to catch any leak
  • jsavagejsavage Posts: 32Member
    Awesome, thank you!
    --
    Homeowner from Providence, RI
    Home b. 1897, one-pipe steam with a indirect gravity hot air system using Gold's pin radiators.
  • JUGHNEJUGHNE Posts: 5,778Member
    Just so you know, the Big Mouth vents do not have a float.
    So is any water gets to it it will spill out.

    I have put these up as high as possible. In school house class room they are on a 4' riser. I added a ball valve under them in the event something happens. I 90ed out the back and nipple down a couple of inches so any steam vapor might not cook the wall. So far so good.
  • SteamheadSteamhead Posts: 13,117Member
    Also, so they can be used as crossover traps.
    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
  • jsavagejsavage Posts: 32Member
    @Steamhead What is a crossover trap?
    --
    Homeowner from Providence, RI
    Home b. 1897, one-pipe steam with a indirect gravity hot air system using Gold's pin radiators.
  • SteamheadSteamhead Posts: 13,117Member
    On a Vapor system, we often find radiator traps piped between the end of the steam main and the dry return. This does the same thing as a main vent- helps air get out of the steam main quickly- but routes the air into the dry return so it will leave the system at the central venting point.
    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
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