I hate to ask for what is probably easy enough for you to do in your sleep, but here goes.
I have sweated plenty of copper, mostly 1/2" & 3/4" variety. I use a MAPP torch, Nokorode flux, and Silvabrite 100 solder. I sand the fittings with emory cloth and the inside with a stainless brush. Recently I've become much more careful about cleanliness and touching the pipe after I clean it.
Most of the time things go great. But most of those times I'm sweating things like air lines for my garage and am using new tube and new fittings, everything is clean and dry, and the position is horizontal etc.
I am redoing a bathroom and I live in an old house. The entire thing is plumbed in copper up to 4" drains. Since the bathroom is gutted I shut off the water to the risers and then bled the pipes back down to the basement. So there should be no water in the pipes. I need to sweat to these stubs coming out of the floor/wall area. Access isn't great but I've had worse. I'm nervous based on past experiences about sweating vertically. Any tips? lower left corner is where the risers come up
My biggest issue over the years is water getting to the joints. I swear I will stuff half a damn loaf of bread in the tube and still get a bad joint. It frustrates me. I have had the same tub of Nokorode for 15 years. I thought maybe it was contaminated so I recently bought a new jar. And new solder.Situation 2:
The other thing I need to do is unsweat a 3" copper toilet drain. I have a 6" piece of new copper to install and bought a new brass deep seal closet flange ring. I would like to sweat in the copper riser while I have everything exposed and before subfloor goes in. My assumption is that a MAPP torch may not be hot enough? I do have an oxy acetylene rig with a rosebud lol...might be a little heavy carrying up the stairs.
From what I read using lead bearing solder is the way to go. Cut pipe, slip on closet ring. Hammer pipe to ring to flare it. Solder with bearing solder which I just procured a 1 lb roll of 50/50 Kester. I assume I could flux with Nokorode?
I've never done this before so would appreciate advice as well.
Mainly I've been dealing with subpar joists and getting those back up to snuff. This entire house is just one big puzzle. I was particularly pleased with how I manage to get my shower drain plumbed and drew out the locations of the holes in the blocking in CAD. It's bad when you have a pseudo machinist doing home construction projects and he brings his Mitutoyo calipers to the job site lol