NFPA CFI-I Exam - Topic 4 Question 19 Discussion

Actual exam question for NFPA's CFI-I exam

Question #: 19
Topic #: 4

[All CFI-I Questions]

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

Show Suggested Answer

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.

by Kallie at Nov 23, 2025, 05:43 PM

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Rosio

9 hours ago

I disagree, I think II could work too.

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Cordelia

6 days ago

Definitely I and III are needed for safety.

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Pete

11 days ago

A) I and III is the correct answer. Inert gas and a pressure relief device are required for safe transfer of Class I flammable liquids.

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Richelle

16 days ago

Wait, so we can't use helium to pressurize the tank? That would be way more fun!

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Gail

21 days ago

Hmm, I'm going with D) II and IV. Using air and an interlock sounds like the safest approach to me.

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Geraldine

26 days ago

C) II and III seems like the way to go. Air is a common pressurizing medium, and a pressure relief device is a must-have.

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Aleshia

1 month ago

Definitely B) I and IV. An interlock on the container is crucial to prevent accidents when pressurizing the tank.

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Gilma

1 month ago

I vaguely recall something about interlocks being important too, but I’m not confident if it’s needed for this specific case.

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Donte

1 month ago

I feel like we practiced a question about pressure relief devices before, which makes me lean towards III being necessary.

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Anglea

2 months ago

Alright, let me think this through. Inert gas is safer than air, so that rules out options C and D. And a pressure relief device is definitely necessary for safety, so I'm leaning towards A as the best answer.

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Elke

2 months ago

I'm a bit confused on this one. I know the safety precautions are important, but I'm not sure which combination of conditions is correct. I'll need to review the material on flammable liquid transfers before I can confidently answer this.

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Alishia

2 months ago

I've got this! The key is that Class I flammable liquids need to be handled very carefully. I'm pretty sure the correct answer is A - inert gas and a pressure relief device are both required.

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Lemuel

2 months ago

I’m not entirely sure, but I think using air could be dangerous, so II seems wrong. Maybe it’s I and III?

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Shay

2 months ago

I think the correct answer is A) I and III. Using an inert gas to pressurize the tank and having a pressure relief device are both important safety measures.

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Bettina

2 months ago

I remember we discussed the importance of using inert gas for pressurizing flammable liquids, so I think I and III might be correct.

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Ligia

3 months ago

Definitely A. Safety first with flammable liquids.

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Laine

3 months ago

What about B? Interlock seems important too.

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Brittni

3 months ago

Okay, let's see. I know inert gas is safer than air for pressurizing the tank, so I'm thinking A or B might be the right answer. But I'm not sure about the pressure relief device and interlock requirements.

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Lavera

3 months ago

Hmm, this seems like a tricky one. I'll need to carefully read through the conditions and think about the safety requirements for transferring Class I flammable liquids.

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