How to test your liquid nitrogen semen tank?

Your semen tank may be failing IF:

The time between fills is becoming shorter.

You notice an increase in liquid nitrogen usage.

You notice frost forming around the neck.

You notice condensation forming on the outside of the tank.

The vacuum plug is missing or is loose in the vacuum port.

The tank has a sharp ping or a thud to it when tapped.

The tank is 10 years or older.