Final answer:
The exact pressure to set when issuing LOX/LIN is not specified and should follow the equipment's operational guidelines or safety protocols. To calculate pressure changes in a gas cylinder after a temperature change or gas loss, the Combined Gas Law and Ideal Gas Law are applied.
Step-by-step explanation:
Before issuing liquid oxygen/liquid nitrogen (LOX/LIN) to a receiving cryotainer, the pressure build-up valve should be opened until the pressure gauge indicates a pressure that ensures safe transfer and maintains the integrity of both the issuing and receiving containers. Typically, this pressure will depend on the operational guidelines provided by the equipment manufacturer or the safety protocols of the facility.
For the high-pressure gas cylinder problem involving toxic gas, the final pressure after cooling to dry ice temperature can be determined using the Combined Gas Law, which relates the pressure, volume, and temperature of a gas. However, the exact value was not specified in the information provided. The question also includes scenarios where gas is lost and where the tank must be cooled to lower the pressure to a specific value, requiring calculations that are based on the Ideal Gas Law or related derivations.