California ICC UST Service Technician Practice Exam

Where are ATG probes typically installed?

1. On the side of the tank

2. Through an opening in the top of the tank

3. At the bottom of the tank

4. In a separate monitoring chamber

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

ATG (Automatic Tank Gauging) probes are typically installed through an opening in the top of the tank. This installation method allows the probes to accurately measure the liquid level, temperature, and other data points necessary for monitoring the contents of the tank. By placing the probes at the top, they can effectively gauge the total volume of fuel and detect changes in level caused by withdrawals or deliveries, as well as any possible leaks. This configuration also facilitates easier access for maintenance and inspection without needing to enter the tank itself, which is critical for safety and compliance with regulatory standards. Other locations, such as the side or bottom of the tank, would not provide the same level of accurate monitoring and data collection. For instance, installing a probe on the side might not effectively account for variations in fuel level that occur, while probes at the bottom could miss early detection of leaks or fuel level changes. A separate monitoring chamber also wouldn't directly measure the contents of the tank in the same way, as this setup is generally for additional environmental monitoring rather than direct gauging of the tank's fuel levels.