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repairing sewer pipe?
This is the main cast iron line leading from a house to the main sewer line that runs along the street. Some kids had dumped a bunch of rocks and gravel down the cleanout hole, and the main sewer line was now clogged underneath a concrete slab. I broke open the concrete slab and dug down to the sewer line where it's clogged. It's sort of around a p-trap. I used an O/A torch to cut open the metal line and am in the process of removing the solid obstructions.
How do I seal up the hole that I've made in the sewer pipe. The hole is about the size of my hand, the pipe is 4". The pipe was probably layed 50-75 years ago, and is probably some sort of cast. I have access to a 220 outlet nearby and have a 220 stick welder. What kind of rod should I use if I weld it? Could I use some sort of epoxy and glue a patch of metal over the hole? This pipe is 3' below ground level, and there is not alot of room to manipulate things in there, it also smells like sewage.
There are "Hubless" fittings and parts for this that you may obtain from your local plumbing supply house - including slip fittings to make up unusual lengths. Rent a "chain cutter" to make nice square cuts and take it from there. Your supply house will cut you a new piece to-size if necessary and give you the exact fittings you need if you bring them a dimension and a piece of the old pipe.
With the right tools and patience, this is no more than a couple of hours work on a bad day. Less than an hour on a good one. Do it right and DON'T try to weld it. That will cause almost immediate failure of the pipe around the weld due to compositional change from the heat.
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