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    roirp's Avatar
    roirp Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 18, 2010, 12:17 PM
    Any problem threading brass pipe int cast iron?
    The pipe from my sight glass on gas boiler was rotted and leaking, I removed pipe and replaced it with brass, it works . Just wondering about electrolysis.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Oct 18, 2010, 12:25 PM
    The original fitting was cast iron. Brass is OK with those species. Aluminum and brass are bad. In old houses, the piping was usually iron and kitchen and bath fixtures were brass.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Oct 18, 2010, 12:30 PM

    There's always the possibility of electrolysis when you comingle different pipe naterials. However, I wouldn't worry too much about yout sight glass supply. Good luck, Tom
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #4

    Oct 18, 2010, 03:44 PM

    Hi roirp...

    Steam boiler... right? If so, replacing that glass tube with brass tubing isn't so great an idea as it will leave you guessing when your boiler will run out of water...

    If you have an updated or a regularly maintained older low water cutoff (L.W.C.O.) then it may not be a major issue, but if that L.W.C.O. hasn't been maintained on a regular basis then the boiler could end up running out of water and it could then "dry-fire" and that will definitely crack the boiler... a very bad thing indeed!

    I would suggest that you go to a local plumbing supply store and buy a new gauge glass tube... if you bring the old glass tube they can probably cut the new tube to the proper length for you, too. Pick up some new brass nuts, brass washers and rubber/neoprene washers while you're there for best overall result!

    If you want to discuss more just let us know, OK?

    Mark
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #5

    Oct 19, 2010, 07:39 AM
    Comment on massplumber2008's post
    Mark, I read that the connecting pipe to the gage was bad, not the glass tube.? Brian
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #6

    Oct 19, 2010, 07:46 AM

    In rereading the question I can see what you mean... thanks for pointing it out :)

    Mark
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