At which of the listed tank locations should...

Question 1 / 270705eccef9cbacbc34ba4d45c17

Question 1 of 270705eccef9cbacbc34ba4d45c17

At which of the listed tank locations should you obtain oxygen content readings prior to tank washing?

Question 1 of 27070

At which of the listed tank locations should you obtain oxygen content readings prior to tank washing?

🔍 Key Concepts

• Gas stratification inside cargo tanks (lighter vs heavier than air) • Safe tank entry and oxygen content requirements before tank washing or work • Where oxygen-deficient or flammable pockets are most likely to form in a tank

💭 Think About

• Think about whether oxygen concentration will be the same at the top, middle, and bottom of a tank, or if it can form layers. • Where do heavier vapors tend to settle, and where might you still have fresh air entering? • If you only sample at the top of the tank, what dangerous condition might be hiding elsewhere?

✅ Before You Answer

• Be sure at least one sampling point checks near the bottom of the tank, where heavy vapors can collect. • Confirm that another sampling point checks higher in the tank, where fresh air or lighter vapors may be present. • Ask yourself which option gives the best picture of the whole vertical atmosphere in the tank before washing.

Question 1 of 27070

At which of the listed tank locations should you obtain oxygen content readings prior to tank washing?

At the hatch coaming and tank bottom.

At the hatch coaming and middle of the tank.

At the middle and bottom of the tank.

At the center of the ullage and one meter below deck.

Question 1 / 270705eccef9cbacbc34ba4d45c17

Question 1 of 270705eccef9cbacbc34ba4d45c17

At which of the listed tank locations should you obtain oxygen content readings prior to tank washing?

Back

Question 1 of 27070

At which of the listed tank locations should you obtain oxygen content readings prior to tank washing?