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Engine : Engineering Safety - 768/968
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The atmosphere of an empty fuel tank is tested and designated "gas free". Which of the following statements is correct concerning this tank?
A) The gas free status is good as long as the initial conditions remain unchanged.
B) The concentration of flammable gas in the compartment is less than 10% of the lower flammable limit.
C) The tank should be frequently retested.
D) All of the above.
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