That is fantastic and so simple.
Yes, that is so simple and even if a burp or hiccup occurs (emptying the tube),
it will begin to refill and reseal on its own!
Very cool idea. simple is so much better. But it needs to be a pretty small tube right? If it empties due to a puff or something, it will need to refill rather quickly.
Also, we have to consider the vacuum the gasifier will be under while running. This will determine how many inches the p-trap will need to be. I was informed of this on my first gasifier when I installed an actual p-trap.
If you make a really deep one, then it should help with the puff problem too maybe. It can’t really be too deep can it?. Water will find it’s own level. As long as the pressure differential is not greater than the depth of the trap can handle without vacating right>?
The one I saw on the anaerobic digester biogas system used a 1/4" ID clear plastic tube. I asked him if it ever got plugged with debris of anything. He just said no, and went on talking about other things without a hitch. I have thought since that it could have been made even more cheaply by using a street Tee in place of the lower elbow.
A long enough trap to prevent the water from being blown out might be kind of unweildy, but if it was a problem you could put some sort of jar or bulb at the end so that the water would just be puffed up into an expansion space and then drain back down into the tube.
Over nozzled… and I’d use a 2" restriction.
A lot of the machines I’ve ran, around 300cc I used 4 1/8inch nozzles