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Old 04-22-2014, 05:45 PM  
kok328
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Default Sweat 3" Copper

Anyone have any experience sweating 3" copper pipe?

I'm not sure about the piping but, I plan to use a 3", Type M, coupler and was wondering if MAPP gas with a Bernzo-matic head will be sufficient to heat that much pipe.



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Old 04-22-2014, 05:53 PM  
JoeD
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I have done it with a normal propane torch.



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Old 04-22-2014, 07:47 PM  
Wuzzat?
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I have done it with a normal propane torch.
Should have taken you longer with propane.
"Map//Pro fuel has 40% more heat transfer in the primary flame than Propane" even though the flame temperature is not much higher.

From what little I've read on this, a helper with another torch may come in handy.

http://www.achrnews.com/articles/126300-air-fuel-or-oxy-fuel-for-soldering-and-brazing
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Old 04-22-2014, 10:58 PM  
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a lot of plumbers use a dual head torch to heat up lager fittings like that.

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Old 04-23-2014, 06:29 AM  
JoeD
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I don't remember how long it took. I only have a normal propane torch and I have used it for 3" copper drains. So it can be done.

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Old 04-23-2014, 09:13 AM  
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Quote:
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I don't remember how long it took. I only have a normal propane torch and I have used it for 3" copper drains. So it can be done.
Your skill level may be above average.
If I ever have to do this I guess I'd use two nozzles with flame spreaders to get uniform and quick heating. Maybe two propane canisters strapped together with a wedge-shaped spacer and hose clamps coupled end to end, so opposite sides of the joint get heated at the same time.
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Old 04-23-2014, 01:51 PM  
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If it was a drain pipe with under 1 psi or water pipe up to 80 psi, would be the deciding factor here.

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Old 04-23-2014, 06:14 PM  
kok328
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Well glad to see it can be done without any special tools.
I had already considered another set of hands and running two torches at the same time.
I only use propane for the BBQ grill and a regular propane torch head won't give you the full benefit of using MAPP gas.
Hey, no guts, no glory, what could go wrong ?
I'll let ya'll know how it turns out.
Thanks.

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Old 04-23-2014, 06:35 PM  
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So. . .is it pressurized?

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Old 04-23-2014, 06:47 PM  
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Years ago I helped a plumber do this with a gas blow torch. He tinned both first and had me hold one peice and push them together while he heated it. As soon as they slipped together he removed the heat and said done.



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