Question 1441 Deck General

The correct answer is A) an above-deck datum such as the top of the ullage pipe. On tankers, ullages are measured from an above-deck datum, typically the top of the ullage pipe, as per industry standards and regulations. This allows for consistent and accurate measurement of the liquid level in the tank, which is critical for cargo operations and cargo calculations. The other options are incorrect because: B) the tank ceiling is not the standard reference point for ullage measurement, C) the tank top is below the deck and not the standard reference point, and D) a thievage mark below the edge of the deck is not the standard reference point used for ullage measurements on tankers.