Here is my project. I Water pressure tank. 24 in. across OD The bottom pipe is 1 1/2 in pipe. Now to cut the top off. Well the Foreman. Lady in the bottom right hand corner says i am doing it correct. AWWW H*#!! Went from 7 in. Blade down to 3 in and still have 6 more inches to cut. Have to put on hold for a few days until i can get to town and pu some more blades. To be Continued. Karl This is what the inside looks like It is 23 3/4 in on the inside accross.