So we are setting up metering/mixing machine for a 2-part polyurethane resin system. Since PU is moisture sensitive, we plan to use nitrogen as a blanket in the supply tanks. Here’s the catch though - the supply tanks are pressurized to help drive the metering system (the tank pressure is what refills the metering pistons). The tanks will be pressurized to 15psi. Do I need to pressurize the whole tank with nitrogen OR can I inject a “blanket” and then pressurize with normal compressed air?
If I recall correctly (it’s been a few years), the tanks we got from the supplier were pressurized with nitrogen.
Roger, thanks for replying - when you say “the supplier” are you referring to your resin supplier or your gas supplier? Our nitrogen will definitely arrive in a pressurized tank. Our resin arrives in un-pressurized pails or drums. These pails or drums are then transferred to the dispensing machine’s tanks.
I was referring to the urethane foam supplier, BASF. The urethane came in big bottles (like oxygen bottles only much large). I’m pretty certain they were pressurized with nitrogen.
Roger, thanks for the clarification. I guess if its how BASF does it, that’s a pretty strong recommendation!