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    michael711's Avatar
    michael711 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 11, 2011, 07:58 PM
    2" copper pipe
    Can 2" copper pipe hold a solder under 180 psi from a boiler?
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #2

    Dec 11, 2011, 09:11 PM
    Hello Michael711...
    I am not an engineer but I assume that if soldered properly, sweat joint will easily hold 180 psi of pressure. Few years back we were soldering refrigeration lines with expected handling pressure of 1,200 psi. Specs called for type "L" copper with regular solder and that's what we've used. Also, we do lot of copper pipe installations in machine shops for compressed air distribution that routinely handle pressure between 500 - 1,000 psi. Never had any problem. Let's see what our other Experts have to say about their experiences. Back to you. Milo
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Dec 12, 2011, 05:49 AM
    I agree with Milo. I've soldered up Freon lines for AC installation using regular solder with no problems. Good luck, Tom
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #4

    Dec 12, 2011, 06:11 PM
    I agree. I do wonder if you are asking about psi though? Never seen a boiler under that kind of pressure, unless it a high pressure steam boiler, which to tell the truth, I just don't have any experience with. Are you maybe asking about temps? Either way, 180 degrees is just fine on a low pressure boiler with Any size sweat joints. We sweat all of our boilers, and even set many of ours at 190 degrees.

    If Im way off base, and you are actually talking about 180 psi on a boiler with two inch piping, can you tell us what temps the boiler will be running at? It could make the difference between being able to solder it, or having to braze it.
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