Discuss NFPA CFI-I Exam Topic 4 Question 27

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.

AI and III

BI and IV

CII and III

DII and IV

Suggested 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.

NFPA 30, Chapter 18: Requirements for transferring flammable liquids under pressure.

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17 comments · newest first

Vallie 23 days ago

Same here, safety first!

Maddie 28 days ago

I’m leaning towards A) I and III as well.

Corrinne 1 month ago

Definitely, air can cause explosions.

Ariel 1 month ago

I feel like C) II and III could be risky.

Nohemi 1 month ago

True, but pressure relief is crucial for safety.

Bobbye 2 months ago

But what about B) I and IV? Interlocks are important too.

Kristal 2 months ago

I agree, inert gas is safer.

Nakita 2 months ago

I think it's A) I and III.

Julieta 2 months ago

Just to clarify, inert gas is a must, right?

Amalia 2 months ago

IV seems unnecessary to me.

Jesse 2 months ago

Wait, are we really using air for that? Sounds risky!

Phillip 3 months ago

I disagree, I thought II was needed too.

Bernardine 3 months ago

I think it's definitely I and III.

Isidra 3 months ago

I vaguely recall something about interlocks being important, but I can't remember if they are mandatory for all transfers. This is tricky!

Marguerita 3 months ago

I practiced a similar question about pressure relief devices, and I think they are definitely necessary, so maybe A or C could be right.

Aleisha 3 months ago

I'm not entirely sure, but I feel like air shouldn't be used to pressurize flammable liquids, which makes me lean towards option A as well.

Horace 4 months ago

I remember that using inert gas is crucial for safety, so I think I should go with option A.

NFPA CFI-I Exam - Topic 4 Question 27 Discussion