California ICC UST Service Technician Practice Exam

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What area within a fuel tank is referred to as "Ullage"?

  1. The area covered by fuel

  2. The area not covered by fuel

  3. The area where the fuel is stored

  4. The area above the in-tank gauge

The correct answer is: The area not covered by fuel

Ullage refers to the volume or space that is not filled with liquid in a tank, specifically the area above the liquid level. This term is particularly important in the context of fuel tanks because it helps in understanding how much space is available for fuel, accounting for thermal expansion, and recognizing how much usable fuel is present. In a fuel tank, the ullage area is crucial for safety and operational efficiency, as it allows for the expansion of fuel due to temperature changes without causing spillage or pressure issues. Proper management of ullage helps in maintaining the tank's structural integrity and performance. The other choices describe aspects of the tank that do not accurately define ullage, as they either pertain to the area occupied by fuel or the specific location of gauges, which do not capture the concept of space not utilized by liquid in the tank.

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