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Main Vent Sizing and Placement
Hi all. Looking for some information on how to properly calculate what main vent would be best for my system.
I have a one-pipe steam system powered by a Burnham low-pressure boiler. Last year I replaced all the radiator vents with Ventrite #1 adjustable vents and the main vent with a Gorton #1. The system is running much better than when we first moved in, but I wasn't sure if I needed more venting.
The boiler sits roughly in the middle of the basement and the main runs down the center of the house, one section towards the front and one section towards the rear. From there, smaller diameter pipes extend off the main and run parallel towards the sidewalls of the house before bending vertical towards the radiators. My question is now, when calculating for the main, should those parallel sections of pipe be included? Also, do you include the vertical length of the pipe to the radiator or is that the responsibility of the radiator vents to vent that portion of pipe?
Also, my main vent sits at the end of the wet return on the elbow before it returns to the boiler. Should I consider raising it off this elbow?
Header - 3 ft. of 2 in. pipe
Riser - 2 ft. of 2 in. pipe
Main - 29 ft. of 1 1/2 in. pipe
- 18 ft. of 2 in. pipe
Return - 18 ft. of 1 in. pipe
Horizontal Extensions off Main Pipe In Basement
Total of 6 ft. of 1 1/4 in. pipe
Total of 62 ft. of 1 in. pipe
Attached are some pictures of the set-up and a diagram of my piping system with pipe sizes and lengths.
Thanks in advance