Removing Old Cast Iron Boiler Pipe

Hello. I'm getting ready to scrap the old heating system in my 1900 Philadelphia house. It consists of an oil-burning converted coal furnace with an added B&G pump feeding through 2-inch and 2 1/2-inch cast-iron mains and returns to 1 inch for cast-iron radiators and 3/4-inch copper for one room of baseboard radiators. I plan to repipe the mains with 1-inch and/or 3/4-inch copper, with appropriate tees and a couple of zone valves. I've got a Viessmann mid-efficiency gas boiler ready to go.
Now my question (but if anyone wants to throw in any other advice, that's fine). Is there any way to remove the old cast-iron pipe without demolishing it? I thought I might be able to loosen the threaded fittings once I removed some copper ends, but no dice so far. Propane heat on the joints appears to make no difference. I've got a metal cutting blade for my circular saw and a 4-inch angle grinder with metal-cutting wheels, so that's my fall-back option. But I figure someone might want this pipe, so if I can leave it usable, that's my preference.
Thanks,
Josh Schneider Philly
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Go to the Wall.
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going to want it for anything beyond fenceposts or maybe garden irrigation. No professional plumber would reuse stock that old. IOW, it's scrap metal at this point. One of the TV remodeling shows showed something called a 'soil stack cutter', a chain based tubing cutter for 4-8 inch drain stacks. But as small as your pipes are, I'd use a smoke wrench, angle grinder, or sawzall. Unless you have someone lined up that wants the pipe, I'd go ahead and cut it into 4-foot sticks for convenient handling, keep it seperated by flavor, and just take it straight to your local scrap brokers. I presume you have already verified the lack of or removed any asbestos? If scrap yard sees white powder, they will turn you away. Silly, but in todays world, they have little business choice.
aem sends...
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