[HITandRUN]

Originally Posted by Gutterz

I wonder if the pressure is making it leak faster? When I was down at Kingpins the other day he doesnt put tops on his their just open. I asked him about evap an he said it dont evap that much an told me to look in the one that it should still be full from the day before an it was. So im realy not sure whats up.

Yeah I had one of those as well! It was a 20L dewar. You could fill it up to the top and leave it there for a week without barley loosing 1/4 of it. I dont see how the relief valve would do it. I think its more bad vacuum in this case.

Originally Posted by Chuchnit

Seriously I just don't understand how no top will evap less than with something covering the neck.

Pressurizing the dewar with a bad vacuum will make it leak out faster so leaving it not pressurized will last longer.