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Can I convert horizontal 1/8" NPT main vent taping to vertical 3/4" for main vent?

Oz Member Posts: 8
The taping on my one-pipe system where the main vent goes is only 1/8". Right now I have a Gorton D vent installed because that is the most aggressive angled vent i can find but I I feel like I need more main venting (radiators hiss). Is there a simple way for a non-DIYer like me to do convert this horizontal taping to vertical one so that I can put a larger vent like a Hoffman 75? Couplers? Adapters?



  • Steamhead
    Steamhead Member Posts: 16,714
    You won't gain much with a #75

    how long is the main, and what pipe size?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • Oz
    Oz Member Posts: 8
    Pardon my ignorance

    How do I measure main length? I see the riser and horizontal header and then 4 pipes branch off to each radiator in the house. The condensate returns via the same pipes then joins a dry return that goes back to the boiler via a loop. Where do I start and stop for main measurements? Do I measure each "branch" separately or is the combination considered the main?
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