Late to this conversation but the safest in my opinion is the metal flex hose.
The Teflon is the next best thing but they also will break under time and stress.
Wear eye and face protection in all cases.
Latex hose should be avoided at all costs.
The fellow Lew is referring to was a friend of mine.
The docs never did find out whether it was a sliver of latex or ice but it didn't matter to Sam...
From: Vernon M Russell [mailto:vrussell_at_wlgore.com]
Sent: Friday, January 24, 2014 5:00 PM
To: ammrl_at_ammrl.org
Subject: AMMRL: Liquid Nitrogen Transfer - Use PTFE
I've been using the same PTFE hose (non reinforced) for 7 years. The only thing I've had to do is trim the ends where the tube slides onto the fill port. This will eventually start to leak due to the tube sliding on and off the fill port. I'd strongly recommend others use the Teflon tubing. You can use short pieces of the Teflon along with a metal coupler to attach to the tank and metal pipe elbows to get the right tube orientation to reach the fill port.
Vernon
Received on Mon Jan 27 2014 - 05:48:50 MST