One-pipe steam system problem

Chris_19

I live in an old apartment building with a one-pipe steam system. Half of the radiators in the rooms have been removed, and I keep the rest completely off. I live on the top floor of the building, and I have two steam pipes that pass through my apt to the roof. At the top of each pipe, near the ceiling, there is a part attached to the pipe, which emits steam/water and I believe some rust. It is noisy and smelly. What can I do to at least stop the smell? Can I replace the part? My building has been of little help so far, so I want to try and do what I can from my end, or present some ideas to my property manager. Thanks.