You pretty much have to open up the wall. If you had access to the ends above and below the wall I suppose you could cut the pipe and put a 3 inch pvc inside of it if there were no branches in the pipe, but that isn't likely. There just isn't any way of fixing it without opening the wall.
Demo a section of the wall.
You must break or cut the wall at that point. No other option
To fix a leaking cast iron stack, first, identify the source of the leak. Clean the area around the leak to remove any rust, debris, or old sealant. Apply a high-quality epoxy or a cast iron repair compound to the damaged area, ensuring it fills any gaps. For larger leaks, consider using a rubber sleeve or clamp as a temporary fix while planning for a more permanent repair, such as replacing the affected section of the pipe.
The cost of replacing a cast iron plumbing stack can vary depending on factors such as the size of the stack, the extent of the damage, and the location of the property. On average, homeowners can expect to pay between 1,500 to 4,000 for the replacement of a cast iron plumbing stack. It is recommended to get quotes from multiple contractors to get an accurate estimate for the specific job.
You pretty much have to open up the wall. If you had access to the ends above and below the wall I suppose you could cut the pipe and put a 3 inch pvc inside of it if there were no branches in the pipe, but that isn't likely. There just isn't any way of fixing it without opening the wall.
Cast Iron extra heavy, Cast Iron service weight, No Hub Cast Iron, Galvanized, Copper Tubing, PVC are the most common BUT plastic should not be exposed to direct sun light thus for the vent terminal CI or other Ferrous materials are desired
El Mutún in Bolivia, where 20% of the world's accessible iron is located.
Take out the old lead and packing and redo it.
Cast iron is fabricated in blast furnaces where iron ore is reduced by coke to cast iron, according to Wikipedia.
no cast iron is more superior than foregn iron
Grey cast ironWhite cast ironMalleable cast ironDuctile cast iron
When Pig Iron is melted and recooled it is called Cast Iron