California ICC UST Service Technician Practice Exam

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Where are Automatic Tank Gauging (ATG) probes installed?

  1. Through an opening in the side of the tank

  2. Through an opening in the bottom of the tank

  3. Through an opening in the top of the tank

  4. Directly into the fuel line

The correct answer is: Through an opening in the top of the tank

The correct answer highlights that Automatic Tank Gauging (ATG) probes are installed through an opening in the top of the tank. This installation method is crucial for accurate monitoring of liquid levels inside the tank. When probes are placed at the top, they can effectively measure changes in the liquid volume and provide a reliable means of gauging the fuel level without being affected by sediment or water that may settle at the bottom of the tank. This positioning also facilitates easier access for maintenance and minimizes the chances of damage to the equipment. The design of ATG systems is such that they require a clear vertical path down to the fuel to ensure accurate readings, which is best achieved through an opening at the top rather than the side or bottom. Given that these probes often rely on pressure transducers or float mechanisms, top installation allows for the most straightforward operation and accurate data retrieval, which is essential for effective tank management and regulatory compliance.

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