Boiler

I have had a boiler to disassemble I was disappointed when I finally got to the guts and found it is not cast Iron . It is steel in one piece - It is around 7.5 feet tall and round in the area 5.5 feet minimum (more) SO OK the deal is this no way to take apart in pieces - a maillot is of no value - diamond coated sawzall blade NOPE - grinder yes and no as blade won't last and still wont hit the second layer as this steam boiler held water 3.5 inch separation of steel walls
I can rent a Jaws of Life grinder for $60 and $12 per blade $125.oo should cover it. Will that work - it is gas powered and I have to admit i feel a little bit over whelmed with the prospect of using this tool but I see no other choice . (plasma can't find a rental YET torch don't have)

Sounds similar to a boiler i have sitting in a friends basement.

5' tall, 2' thick. Solid steel. Weight is over 350.

I havent got it yet cause i am not sure how to.

Jaws of life cutter works but still a slow job and also the saw motor could not hit high RPMs so they have to give me another one next week. The blade seems to have long life
and relatively safe to use , A blade with teeth I feel could be dangerous as it might kick and cut you up The blade I am using a fiber type seems not to grab or even make to much dust

Thanks for the update

I was told by a experienced guy about the tool - using this tool with teeth blades - It can catch and can kick out of your hands fly in the air and cut your shoulder OFF (nice). With the fiber type i felt no kick issue BUT I am going to be on guard . What I see is the main technique - first make the diagonal hole slowly .Then work the tool up slow . This tool you need not rush . don't force it . Same as a angle grinder but some times we might impatiently force a small one - this tool NO .