Question 4

The Correct Answer is D **Why option D (Innage) is correct:** Innage refers to the measured depth of liquid (such as a petroleum product) in a tank, measured from the surface of the liquid to the bottom of the tank. It is a direct measurement of the contents' depth or volume. **Why the other options are incorrect:** * **A) Thievage:** Thievage is the term used for the measurement of any free water or sediment/water mixture found at the bottom of a petroleum tank beneath the product itself. It does not refer to the depth of the petroleum product. * **B) Ullage:** Ullage (or outage) is the distance from the reference point (or gauging hatch) at the top of the tank down to the surface of the liquid product. It measures the empty space above the liquid, not the depth of the product. * **C) Outage:** Outage is synonymous with ullage. It measures the empty space above the liquid (the distance from the top reference point down to the liquid surface), not the depth of the liquid product itself.