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Main vents

Brad White
Brad White Member Posts: 2,398
from a slug of steam-propelled water crashing up inside the vent and making scrap metal of it's delicate insides...

If you keep that in mind, (as I think you are) you can do the right thing.

I have seen it recommended to put an elbow or two between the vent and the main, (maybe a switch-back with it's own dead-end tee, thinking out loud?) and slow down the wave at least.

But with that approach, there are no guarantees. You really do want a wave, if it occurs, to pass harmlessly by, below your vent tapping. One whack at over 3 PSI is all it takes. Even lower pressures can generate some force above that with velocity and a good slug of water.
"If you do not know the answer, say, "I do not know the answer", and you will be correct!"

-Ernie White, my Dad


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