Question 946 Deck General

The correct answer is C) one half the ullage of the tank and one meter below the tank top. The regulations for checking the oxygen content of cargo tanks prior to loading cargoes requiring vapor recovery state that the atmosphere must be sampled at one-half the ullage of the tank and one meter below the tank top. This ensures the atmosphere is tested at the middle and upper levels of the tank, which is necessary to confirm the tank is properly inerted and safe for cargo loading. The other options are incorrect because they do not match the specific regulatory requirements. Option A samples at the bottom and top, but not the middle. Option B samples at the bottom and middle, but not the top. Option D samples at set intervals, but does not target the specific locations required.