Question 1274Deck General70% to pass
Where are ullages measured from?
AI Explanation
The correct answer is C) an above deck datum.
Ullages, which refer to the volume of space above the liquid in a tank, are measured from an above deck datum. This is typically a fixed reference point located above the tank, such as the deck or a dedicated measurement point. This allows for consistent and accurate measurement of the tank's contents, regardless of the tank's shape or size.
The other options are incorrect because: A) the thievage mark is not a standard reference point for ullage measurements, B) the tank ceiling is not a suitable reference point as it can vary in height, and D) the tank top bushing is a component of the tank itself, not an external reference point.
Related Questions
#1272 Ullage measurements are taken from the top of the liquid to which of the following points? #1273 Sounding tubes and access openings for fuel oil tanks on cargo vessels are permitted by U.S. regulations to be located in which of the listed spaces? #1275 U.S. regulations define several acceptable means of closure for ballast and fuel oil tank vents. Which of the following is an example of acceptable means? #1276 To insure proper seating when closing a valve on a tank, the valve should be _______________.#1277 The pipe used to connect two separate piping systems on a tank vessel is known as a _______________.