Pete, John
If you were to place a pressure relief valve on the column would you place it on the very bottom of the column just above the pot?
If someone packed their column to much or a puking situation developed it would have a chance to rupture for sure.
Our water supply for the deflag comes from one source, i can reroute it in different directions, mash, condenser ect..or shut off the deflag. Having the relief valve on the outlet side of the deflag allows for pressure to escape just in case i forget to open the other end to allow the water to go to the holding tank.
It reminds and works 2 ways, reminds me if i don't have the valves open properly the relieve will open and the cooling water will spill on the floor, or allowing the water in the deflag to escape once the system is closed off.