Question 946Deck General70% to pass
When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery, the atmosphere must be sampled _______________.
AI Explanation
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.
Related Questions
#944 While underway and towing an unmanned tank barge you are required to _______________.#945 The vapor pressure of a gas is defined as the pressure necessary to keep it in what state? #947 Static electricity may be built up by the _______________.#948 Your ship has loaded 22,000 barrels of crude oil, departing Valdez, Alaska for Panama. When loaded the cargo temperature was 90°F. API was 15°. The volume correction factor (VCF) is .0004. If the cargo temperature is expected to be 100°F at the discharge port, how many barrels will be offloaded? #949 During the ballast voyage, how are the tanks kept cold on an LNG tanker?