I have a consistent problem with vapor traveling from my boiler to my column via the return pipe. There is no P-trap on the return or downspout in the boiler. The vapor causes flooding in the lower plates and oddly enough plate 7 of my DYE 16 bubble plate column. Because of this I have to constantly drain certain plates and this throws the entire system off and effects my collect rate, temp and proof. I have, through a lot of babysitting, chainsmoking, hairpulling and valve manipulating, gotten the system to run smoothly without flooding any plates. However, I feel like a downspout in the boiler or a P-trap just outside the return line would immediately remedy these issues.
Does anyone have a system that also lacks a downspout or vapor trap? How do you prevent vapor from creeping up the return?