Question 62Safety & Environmental - 1st Asst/Chief

The correct answer is D) All of the above. This is because: 1) The gas free status of an empty fuel tank is only valid as long as the initial conditions remain unchanged. If the tank is disturbed or additional sources of gas are introduced, the tank would need to be retested. 2) For a tank to be considered "gas free", the concentration of flammable gas must be less than 10% of the lower flammable limit, per industry standards and regulations. 3) Since the gas free status can change, the tank should be frequently retested to ensure it remains within safe limits. The other options are incorrect because they only address part of the requirements for a tank to maintain gas free status.