Not trying to be a dick, but I an truly deeply worried about that boiler running at that pressure.
Steam boilers are only rated at 15 psi. IF you pop a hole in that thing, and it drains down, dry fires, and then gets cold water dumped on it, the building will blow up and people will die. No kidding. Seriously.
If you're not SURE that if it's steam or not, say so, but make sure that this thing gets checked to be certain, and soon.
I'm not trying to scare you, just trying to impress upon you the gravity of the situation.