Welcome! Here are the website rules, as well as some tips for using this forum.
I have an academic question to check if I am understanding one pipe steam venting correctly (because I am about to reinstall my new radiators and need to order vents, and I want to land in the right ballpark).
Please excuse my nomenclature, I am not sure what all the proper industry terms are.
Let’s say you have existing steam system in the basement that feeds a three story house. The big pipe (main?) that supplies everything before it turns up is optimally vented and insulated. If I wanted to get steam to every radiator at the exact same time, in the theoretical world (and I am not suggesting a person do this), would this work?
1. station an elf with a stopwatch at every single radiator connection, have the valve wide open
2. Once the steam reaches the main, have every elf time how long it takes the steam to get to their location.
3. Install a vent Before the radiator according to the charts in Dan’s book to vent all those fast.
4. Calculate the volume of air in the largest radiator and pick 2 radiator vents that will allow that radiator to fill slowly but sufficiently.
5. Extrapolate what rate you would need to fill the other radiators so that they also fill in the same time the big radiator fills.
If all that was done precisely, would you have a perfectly balanced steam system?
Then as a follow up to that, I have a third floor sunrad that lives in the wall. The supply to that is buried in the wall. Is there a way to vent the supply pipe separately from the radiator?
In the absence of my steam elves scheme, if I want to vent the vertical pipes (are those still called steam mains?) separately from the radiators, does that mean replacing the shutoff valves? Right now I have the kind that the pipe goes up into it, and the turney-wheel thing sits on top, and the connection to the radiator is on the side.
And practically speaking will I see any appreciable performance increase in venting the first and second floor vertical pipes separately from the radiators if they are only supplying one radiator each?
Thanks in advance, you guys are a such a great resource.