Before a tank is to be crude oil washed,...

Question 1 / 270705eccef9cbacbc34ba4d45c2b

Question 1 of 270705eccef9cbacbc34ba4d45c2b

Before a tank is to be crude oil washed, what position must the oxygen content in the tank must be measured at?

Question 1 of 27070

Before a tank is to be crude oil washed, what position must the oxygen content in the tank must be measured at?

🔍 Key Concepts

• Crude oil washing safety procedures (oxygen limits and where measurements must be taken) • How oxygen concentration can vary with height inside a tank • Why regulations require measuring at the most dangerous (highest O₂) location rather than the easiest location

💭 Think About

• Think about where in a cargo tank oxygen is most likely to be higher when there is oil and inert gas present—near the liquid surface, higher up, or in the vent line? • If you want to be sure the ENTIRE tank is safe for crude oil washing, should you measure where it is most inert, or where oxygen is likely to be greatest? • Which option describes a specific, repeatable location inside the tank that best represents the worst‑case oxygen concentration for safety checks?

✅ Before You Answer

• Verify which options are inside the tank volume versus in associated piping or outside spaces • Check which position would likely show the highest oxygen content if air leaks in or mixing is imperfect • Confirm that the chosen position is a standardized, regulatory reference point used in crude oil washing procedures (rather than just a convenient spot)

Question 1 of 27070

Before a tank is to be crude oil washed, what position must the oxygen content in the tank must be measured at?

in the vent riser

at the top of the tank

one meter from the deck

immediately above the level of the oil

Question 1 / 270705eccef9cbacbc34ba4d45c2b

Question 1 of 270705eccef9cbacbc34ba4d45c2b

Before a tank is to be crude oil washed, what position must the oxygen content in the tank must be measured at?

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Question 1 of 27070

Before a tank is to be crude oil washed, what position must the oxygen content in the tank must be measured at?