Is this main vent location adequate?

Answerman

I'm involved in a project where additional main vents were recently added. This is a one-pipe system with wet returns. In two locations the previous vents (a single Hoffman #4A I beleive, or similar), was removed and replaced with a manifold of 3 Gorton Ds each. But my question is not about the vent sizing, which I know is probably not enough (not my call)..

I'm wondering how suitable the location is. As you can see in the photos below, the vents are not installed directly on the main, but off of the drip leg. This seems less ideal than directly on the main, since I imagine that as condensate starts draining down that drip leg (from the cold mains), there would be less room in the pipe for air to escape. It must work to some degree, as most of the previous vents were installed in this way and seem to work. But I'm wondering if this installation will impair the performance of the vents or have other issues, I'm curious to hear your thoughts.

Photos:




(edit: I think those are actually Gorton #1s, but apparently that's the same vent as a D just with a different tapping..)

New England SteamWorks

I think the location is okay. The air will precede the steam and the condensate. But as you noted, capacity is lacking.

EzzyT

I Agree with @RI_SteamWorks

Steamhead

EzzyT said:

I Agree with @RI_SteamWorks

So do I.

How long are those mains, and what pipe size?

gerry gill

yup, its ok.

Barnes and Jones vari vents would have been a better choice.