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Two vents on one radiator, single-pipe steam system
Hello! A plumber suggested we balance our building's single-pipe steam system by having two vents on certain radiators (on the hot side of the building). This plumber helped us get much better balance with some work last spring, and now we're fine tuning. Sadly he is now not returning our calls, so we've called someone else to try and implement the work. The plumber who can implement the work is saying the way to have two vents is to use some type of t-fitting at the existing location, and then the two vents would connect to that fitting. This seems weird to me, so I started to do some research.
I saw Dan's article on this site regarding multiple ways to help balance a single pipe system, explaining one technique as follows: "Use two vents on oversized radiators. Oversized radiators are always a challenge. No matter what size vent you use, that vent will close once the steam reaches it – even if much of the air remains in that huge radiator. The Deadmen often faced this challenge by drilling and tapping those oversized radiators for a second air vent. They positioned the second vent a few inches lower than the first. The two vents then worked together to let the air out. When steam reached the first vent (the higher of the two), that vent closed. But the second vent (at the lower level) continued to vent air from the radiator. As a result, the radiator heated more completely, and brought the Deadmen a step closer to system balance. This trick can work just as well for you."
This one-vent-below-the-other explanation makes sense, and the t-fitting suggestion I don't really get. Am I correct to think the plumber suggesting the t-fitting is just a knucklehead, and ask him to place one-vent-below-the-other?