In the kitchen of an apartment I've just moved in there's a vertical pipe running floor to ceiling, not connected to any radiator nearby. It gets hot, so I assume it is a part of steam heating system. There's a vent on the pipe that emits very loud hissing time after time, especially at night.
I'd like to stop this noise. Can I just plug the hole in it or remove it altogether?
As far as I understand, such vents serve to let the air and excessive steam out from radiators which only have one pipe connection. The pipe in question obviously has two connected ends (going to the floor and to the ceiling), so a vent on this pipe looks superfluous. But I never encountered steam heating before, so I'm being extra careful.
Vents on other radiators in the apartment hiss seldom and reasonably softly, and the radiators are hot; I suppose these function correctly.