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Why brass?

In this link concerning hooking up a vaporstat it says to use brass fittings. Why? Would it be to stop a galvanic reaction or for some other reason.

http://www.heatinghelp.com/files/posts/14911/Low%20Pressure%20Gauge%20Piping%20-%20%20Bill%20of%20Materials.pdf

Comments

  • vaporvacvaporvac Posts: 1,512
    edited January 2014
    Brass or bronze? Union?

    I see that actually say bronze...I bought mine brass. Is that OK. Also, I put unions at both the top AND bottom of the pigtail thinking I could take off both controls and not have to worry about removing the pigtail. Is the illustration a way better way?
    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
  • Jamie HallJamie Hall Posts: 6,431
    Brass or bronze...

    but I don't think I've ever seen a bronze pigtail; it's usually red brass.



    And the reason isn't a galvanic reaction problem, it's that iron will rust and plugs up much more quickly and is harder to clean. 



    Unions?  I love them.  Makes life so much simpler...
    Jamie



    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.



    Hoffman Equipped System (all original except boiler), Weil-McClain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
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