California ICC UST Service Technician Practice Exam

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What type of sensor do double wall tanks typically use?

Pressure sensors
Annular space sensors
Temperature sensors
Level sensors

The correct answer is: Annular space sensors

Double wall tanks are designed with an inner tank and an outer containment shell, creating an annular space between the two. The purpose of this design is to provide additional safety and leak detection capabilities. Annular space sensors are specifically utilized to monitor the integrity of this space. These sensors can detect the presence of any fluid within the annular space, which may indicate a leak from the inner tank. By using annular space sensors, operators can respond swiftly to potential leaks, thereby minimizing environmental impact and ensuring compliance with safety regulations. In contrast, pressure sensors would primarily monitor the pressure within the inner tank but not specifically the annular space. Temperature sensors are useful for monitoring the fluid inside the tank but do not address containment integrity. Level sensors help determine the amount of product inside the tank but also do not provide information regarding leaks. Overall, annular space sensors play a critical role in leak detection for double wall tanks.