What is the internal working pressure of a high pressure cargo tank classified as MC 331?

The internal working pressure of a high-pressure cargo tank classified as MC 331 is indeed 250 psi. MC 331 tanks are designed to transport certain gases that are liquefied, such as propane, butane, and other chemicals under pressure. This specific classification indicates that the tank must withstand pressures of this magnitude to safely contain the cargo it transports.

Understanding the pressure specifications is crucial for safety compliance and operational procedures during loading, transport, and unloading of hazardous materials. In the context of HAZMAT operations, knowledge of the pressure limits ensures that responders can effectively manage incidents involving these types of tanks, avoiding potential hazards associated with exceeding these limits.

The other pressure values are either too low or not applicable to the MC 331 classification, which emphasizes the importance of recognizing the correct specifications for safe handling and transport of these materials.