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Old 10-17-2016, 11:19 AM   #1
mattman

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Default Nitrogen blanket in supply tanks - advice?

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?
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Old 10-18-2016, 09:22 AM   #2
Roger

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If I recall correctly (it's been a few years), the tanks we got from the supplier were pressurized with nitrogen.
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Old 10-18-2016, 12:19 PM   #3
mattman

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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.
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Old 10-19-2016, 08:08 AM   #4
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Quote:
Originally Posted by mattman View Post
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.
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Old 10-20-2016, 03:05 AM   #5
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Roger, thanks for the clarification. I guess if its how BASF does it, that's a pretty strong recommendation!
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