Which designation is used for high-pressure tanks that carry liquefied gases such as LPG and anhydrous ammonia?

Which designation is used for high-pressure tanks that carry liquefied gases such as LPG and anhydrous ammonia?

• A. MC 338
• B. MC 312
• C. MC 331
• D. MC 307 / DOT 407

Answer: (C)

High-pressure cargo tanks are designed to keep certain gases as liquids by using significant internal pressure. Liquefied gases like propane (LPG) and anhydrous ammonia are carried in this way, so the designation identifies tanks built to handle those higher pressures. That specific designation is used for high-pressure tanks carrying liquefied gases. It distinguishes them from other tank types designed for low or non-pressurized liquids (which have different designations) and from cryogenic or refrigerated liquefied gases that require very different temperature conditions. The other designations are associated with those alternate service conditions, not with the high-pressure liquid-gas service described here.

High-pressure cargo tanks are designed to keep certain gases as liquids by using significant internal pressure. Liquefied gases like propane (LPG) and anhydrous ammonia are carried in this way, so the designation identifies tanks built to handle those higher pressures.

That specific designation is used for high-pressure tanks carrying liquefied gases. It distinguishes them from other tank types designed for low or non-pressurized liquids (which have different designations) and from cryogenic or refrigerated liquefied gases that require very different temperature conditions. The other designations are associated with those alternate service conditions, not with the high-pressure liquid-gas service described here.