When checking the oxygen content of the...

Question 1 / 2707066636ee728f7522a1c5176cd

Question 1 of 2707066636ee728f7522a1c5176cd

When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery, the atmosphere must be sampled __________.

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Question 1 of 27070

When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery, the atmosphere must be sampled __________.

🔍 Key Concepts

• Stratification of gases inside a cargo tank (heavier-than-air vs lighter-than-air vapors) • Purpose of checking oxygen content before loading cargoes with vapor recovery • Why sampling at more than one vertical level is important for safety

💭 Think About

• How might oxygen concentration vary between the top and bottom of a closed tank, especially when inerted or recently gas-freed? • For safe loading with vapor recovery, do you need to be confident about oxygen levels only at one point, or throughout the tank height? • Which options give you a representative picture of both the upper and lower parts of the tank atmosphere rather than just one region or very widely spaced points?

✅ Before You Answer

• Make sure the method checks both upper and lower parts of the tank atmosphere, not just one • Check whether the option would reasonably detect stratified pockets of higher oxygen content • Verify that the spacing is practical and consistent with getting a representative sample before loading, rather than excessive or insufficient sampling points

Question 1 of 27070

When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery, the atmosphere must be sampled __________.

one meter from the tank bottom and one meter below the tank top

one half the ullage of the tank and one meter above the tank bottom

one half the ullage of the tank and one meter below the tank top

at three meter intervals from the tank top

Question 1 / 2707066636ee728f7522a1c5176cd

Question 1 of 2707066636ee728f7522a1c5176cd

When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery, the atmosphere must be sampled __________.

Back

Question 1 of 27070

When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery, the atmosphere must be sampled __________.