Help! Can't desolder old corroded pipe

[vintshave]

Hi,

Hoping for some help here. I recently found a pipe that rotted out under my kitchen sink, leaking water all over the kitchen. It goes through the floor and into a pipe that leads to a waste drain in the basement. I used a blowtorch for almost 10 minutes and could not budge it at the closest elbow joint. The propane torch did not even make the pipe glow. I know it isn't steel...could be brass I suppose.

Well, to get to the point, the wife is without her kitchen sink and dishwasher and is NOT happy. I need to replace that length of pipe running to the elbow. Any ideas on what I'm doing wrong and how I could, for not too much money, solve the problem? Ideas I had:

-Cut the pipe and (how would I attach a new length of pipe to it?)
-Replace the whole 10 feet of pipe with PVC (Think it would involve 2 elbows and 3 lengths of pipe)
-Try to melt the joint with something hotter (?)

HELP!!!

Thanks in advance!

John

 

[Mr_David]

Lots of do-it -yourselfers will just cut it off and use a neoprene coupling with a metal band ( mission coupling ) and just replace it with plastic. Google images of kitchen drains . Not all the pictures you find will be the correct way but if you look at enough of them you will get a good Idea of your optio. Post a picture would be helpful

 

[vintshave]

Lots of do-it -yourselfers will just cut it off and use a neoprene coupling with a metal band ( mission coupling ) and just replace it with plastic. Google images of kitchen drains . Not all the pictures you find will be the correct way but if you look at enough of them you will get a good Idea of your optio. Post a picture would be helpful

Here are 3 shots....one of the rotted out end of the pipe, one of the elbow I was trying to desolder and one of the other end of the pipe.

 

[LiQuId]

use mapp gas instead of propane it burns hotter, and you need a torch head that is big enough ( not a pencil torch flame ) or just cut it out and

A. solder new fittings onto it..
B. Change over to plastic <---- I suggest this one as its easier for a DIY.
plus plastic is cheap as chips and copper, even DWV grade is pricey

 

[johnjh2o]

What is that copper connecting to at the other end? It looks like a upside down cast iron hub. It mat be a good idea to replace the entire copper line and make a proper connection to what ever you have there. There is also no vent on the line. This may be a good time to install a AAV under the sink.

John

 

[Mr_David]

Just cut it off and rework it with Plastic ABS or PVC.
Use a mission coupling or similaiar.
they make one to fit DWV copper pipe X ABS/cast Iron/Stl pipe

 

[vintshave]

Just cut it off and rework it with Plastic ABS or PVC.
Use a mission coupling or similaiar.
they make one to fit DWV copper pipe X ABS/cast Iron/Stl pipe

Where in the line of pipe shown would you recommend making the cut? Also, on the side that comes up through the cabinet to the sink, would I need to do or get anything different there?

Thanks for your help!

 

[vintshave]

use mapp gas instead of propane it burns hotter, and you need a torch head that is big enough ( not a pencil torch flame ) or just cut it out and

A. solder new fittings onto it..
B. Change over to plastic <---- I suggest this one as its easier for a DIY.
plus plastic is cheap as chips and copper, even DWV grade is pricey

Where in the line would you suggest cutting the pipe? What would I use to connect the copper to PVC?