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Bob Engelhardt

wrote:

Sure the boiler is cast? ...

Oh, yes.

A 10 lb sledge works wonders on cast fittings and radiators,
though(bathtubs, too).

I'm tempted to try (I have a 12 pounder), but I expect that it will be
much more work. Not to mention the little fragments that are wannabe
shrapnel.

Not sure why a cutting torch would be less
safe than a plasma cutter, you've still got very hot particles flying
around, the fire hazard is going to be about the same.

I think it's more the gas itself that he doesn't want around. If it
were up to me, we would use a gas torch.

You're going
to have to have a hefty power supply for a plasma cutter, plus air or
a gas bottle. ...

We still have the electric service, and compressors.

Thanks,
Bob