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To transfer Class I flammable liquids by pressurizing the tank, which of the following conditions must be met? I . Inert gas is used to pressurize the tank. II . Air is used to pressurize the tank. III . A pressure relief device shall be provided. IV . An interlock shall be installed on the container.
Correct Answer: A
Transferring Class I flammable liquids involves strict safety conditions to prevent fire or explosion risks. According to NFPA 30, Flammable and Combustible Liquids Code: Inert gas (I): Pressurizing the tank with inert gas (e.g., nitrogen) is required to prevent the creation of a flammable atmosphere. Air (II) is not acceptable because it introduces oxygen, which can result in combustion. Pressure relief device (III): A pressure relief device is mandatory to prevent over-pressurization, which could cause a tank failure or explosion. Interlock (IV): While useful for operational safety, it is not specifically required for pressurizing tanks. Reference: NFPA 30, Chapter 18: Requirements for transferring flammable liquids under pressure.
