B. FILLING INSTRUCTIONS
To avoid damage to the aluminum cryogenic vessel which may result in premature vacuum loss, it is important to follow this procedure during the addition of liquid nitrogen to a warm vessel and on subsequent additions
1. Slowly pour liquid nitrogen into new or warm vessels with a funnel or transfer line when possible.
2. Allow liquid nitrogen to settle in vessel for 2 hours to completely cool inner.
3. Fill the vessel to the desired level after the 2 hr settling (cool down) time
4.。If filling the container from a pressurized source, make sure that the source tank is at a low safe pressure.
5. Remember to always wear proper safety attire over clothing; face shield, cryogenic gloves, and apron.
6. Never overfill your container with liquid nitrogen. Overfilling the tank may cause pumpout components to leak leading to immediate or premature vacuum failure to occur.