To transfer Class I flammable liquids by pressurizing the tank, which of the following conditions must be met?

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.
A . I and III
B . I and IV
C . II and III
D . II and IV

View Answer

Answer: A

Explanation:

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.