1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)
    Caluwe - Passion for Fire and Water ( Pellet and Wood Hydronic and Space Heating)

double tapped bushings

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by 8nrider, Oct 29, 2011.

  1. 8nrider

    8nrider New Member

    Joined:
    Aug 15, 2008
    Messages:
    118
    Loc:
    new hampshire
    i'm setting up a mb 55 (1982 tarm) with 500 gal (propane tank) storage.very worried about stratifaction in the tank.should i use brass bushings, or castw/ brass nipples.help thank you.

    Helpful Sponsor Ads!





  2. Hunderliggur

    Hunderliggur Minister of Fire

    Joined:
    Dec 23, 2009
    Messages:
    602
    Loc:
    Lothian, MD
    Brass or cast will not make any difference in stratification ;-) I use 1 1/4 supply and return on my storage with a Paxo 40. The horizontal tanks stratify just fine. I have radiant floors so my usable temp is quite low and stratification is not a big issue for me anyway. Are you a high temp radiator/water-air hx or lower temp radiant.

    And to answer your question, I used cast.
  3. 8nrider

    8nrider New Member

    Joined:
    Aug 15, 2008
    Messages:
    118
    Loc:
    new hampshire
    my system is low temp radiant. i am worried about, i believe it is called a dielectric reaction. i am using 1 1/4 copper for piping.
  4. ewdudley

    ewdudley Minister of Fire

    Joined:
    Nov 17, 2009
    Messages:
    1,627
    Loc:
    Cayuga County NY
    They say do it right you need the brass to make the transition to copper, but it shouldn't matter where you do it, if you believe what they say.

    It would be just as correct and more than likely more economical to start out with the cast black iron double tap bushing and then go from iron to copper with brass in between wherever it was most convenient.

    But if the piping is always dry on the outside, and oxygen depleted on the inside, it's hard to believe what they say about the need for the brass.
  5. afblue

    afblue Feeling the Heat

    Joined:
    Sep 1, 2009
    Messages:
    278
    Loc:
    Buffalo, NY
    I would still think a Dielectric Union is going to be your cheapest option. I would imagine a brass nipple 1 1/4" plus a 1 1/4 Female NPT copper fitting to run you $20-30 a set. A brass coupling, and a Male NPT copper fitting just the same. If you go to a good plumbing supply, not the big box stores, I got my Dielectric unions, 1 1/4" for $6.90 each. Steel threaded one side, 1 1/4" Brass Sweat nipple the other side. Unions also give you a good connection point so if you ever had to disconnect for some reason, its easier than unsweating a copper line.
  6. ewdudley

    ewdudley Minister of Fire

    Joined:
    Nov 17, 2009
    Messages:
    1,627
    Loc:
    Cayuga County NY
    If you believe what they say about the need for dielectric separation in a closed boiler system, then it would probably be better to avoid a dielectric union up near the top of storage if the area will be closed-off by insulation where you can't see if it develops a leak.
  7. 8nrider

    8nrider New Member

    Joined:
    Aug 15, 2008
    Messages:
    118
    Loc:
    new hampshire
    thanks for all the input. does anyone know of a supplier that has brass bushings? the less conections the less chance of leaks.thanks agian.
  8. Dune

    Dune Minister of Fire

    Joined:
    Jan 14, 2008
    Messages:
    2,758
    Loc:
    Commonwealth Of Massachussetts
    F.W.Webb
  9. 8nrider

    8nrider New Member

    Joined:
    Aug 15, 2008
    Messages:
    118
    Loc:
    new hampshire
    tried webb for my expansion tank. none in there system had 4 on back order and the had orders for 6. told me the could not get 1 1/2 to 1 1/4 brass. then i started looking on line. what a price difference w/ copper. i guess its one thing when you can mark up 10 - 20 % when dealing w/ a customer, its another when it comes out of your pocket. i think i'm done w/ webb. besides 34 mile round trip in the f250 can pay for some quick shipping!!!

Share This Page