The atmosphere of an empty fuel tank is...

Question 1 / 270705eccef9ebacbc34ba4d465db

Question 1 of 270705eccef9ebacbc34ba4d465db

The atmosphere of an empty fuel tank is tested and designated "gas free". Which of the following statements is correct concerning this tank?

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Question 1 of 27070

The atmosphere of an empty fuel tank is tested and designated "gas free". Which of the following statements is correct concerning this tank?

🔍 Key Concepts

• Gas-free status and what it actually certifies about the tank atmosphere • The meaning of lower flammable limit (LFL) and typical safety margins used on ships • The need for continuous or repeated testing when conditions can change (temperature, ventilation, product residues)

💭 Think About

• If a tank is declared gas free at one moment, what kinds of changes on board could cause that condition to become unsafe again? • How does the LFL relate to when a vapor/air mixture can ignite, and what percentage of LFL is usually considered a safe maximum for entry or work? • Would a single statement be enough to fully describe gas-free requirements, or do safe procedures usually involve multiple conditions and ongoing precautions?

✅ Before You Answer

• Check what gas free means in standard tanker and confined space procedures (is it only about flammability, or also about toxicity and oxygen?). • Verify whether retesting frequency is mentioned in standard safety guidance for enclosed spaces and fuel tanks. • Confirm the typical maximum allowable percentage of LFL used as a criterion for declaring a space gas free (often a small fraction of the LFL).

Question 1 of 27070

The atmosphere of an empty fuel tank is tested and designated "gas free". Which of the following statements is correct concerning this tank?

The gas free status is good as long as the initial conditions remain unchanged.

The tank should be frequently retested.

The concentration of flammable gas in the compartment is less than 10% of the lower flammable limit.

All of the above.

Question 1 / 270705eccef9ebacbc34ba4d465db

Question 1 of 270705eccef9ebacbc34ba4d465db

The atmosphere of an empty fuel tank is tested and designated "gas free". Which of the following statements is correct concerning this tank?

Back

Question 1 of 27070

The atmosphere of an empty fuel tank is tested and designated "gas free". Which of the following statements is correct concerning this tank?