California ICC UST Service Technician Practice Exam

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Which type of tanks is equipped with interstitial sensors?

  1. Single wall tanks

  2. Double wall tanks

  3. Both single and double wall tanks

  4. Neither type of tank

The correct answer is: Double wall tanks

Double wall tanks are specifically designed with an outer wall that encases the inner tank, creating an interstitial space. This interstitial space is crucial for the detection of leaks because it allows for monitoring between the two walls. Interstitial sensors are installed within this space to identify any liquid accumulation or signs of leakage from the inner tank before it can escape into the environment. In contrast, single wall tanks do not have this additional layer, making them less equipped for early leak detection. There are no interstitial sensors in single wall tanks as there is no interstitial space to monitor. Therefore, the presence of interstitial sensors is a fundamental feature of double wall tanks, ensuring enhanced safety and environmental protection.

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