From a 150-lb cylinder, the maximum sustained gas withdrawal rate per degree Fahrenheit is what?

From a 150-lb cylinder, the maximum sustained gas withdrawal rate per degree Fahrenheit is what?

• A. Zero
• B. One pound per day per degree Fahrenheit
• C. Two pounds per day per degree Fahrenheit
• D. Five

Answer: (B)

Gas cylinder withdrawal is limited by how temperature affects the gas pressure and cooling of the cylinder. For a standard 150-lb cylinder, the safe rule is to allow only one pound of gas per day for every degree Fahrenheit of temperature difference between the cylinder and the withdrawal system. This means the allowable withdrawal rate scales with the temperature difference: for example, if the cylinder is 5°F warmer than the system, you could withdraw about 5 lb per day. This limit helps prevent excessive cooling of the cylinder, which can cause ice formation, leaks, or pressure instability. Rates like zero would prevent any usable gas, and rates of two or five pounds per day per degree Fahrenheit exceed the recommended safety limit for this size cylinder.

Gas cylinder withdrawal is limited by how temperature affects the gas pressure and cooling of the cylinder. For a standard 150-lb cylinder, the safe rule is to allow only one pound of gas per day for every degree Fahrenheit of temperature difference between the cylinder and the withdrawal system. This means the allowable withdrawal rate scales with the temperature difference: for example, if the cylinder is 5°F warmer than the system, you could withdraw about 5 lb per day. This limit helps prevent excessive cooling of the cylinder, which can cause ice formation, leaks, or pressure instability. Rates like zero would prevent any usable gas, and rates of two or five pounds per day per degree Fahrenheit exceed the recommended safety limit for this size cylinder.