California ICC UST Service Technician Practice Exam

What is used when there is insufficient slope on vapor return lines from dispensers to tanks?

1. Vapor belly pot

2. Wet well

3. Drainage pit

4. Overflow tank

The correct answer is: Vapor belly pot

The vapor belly pot is utilized in situations where vapor return lines from dispensers to tanks do not have adequate slope for proper drainage. This device serves as a collection point for any vapor that might accumulate, preventing potential blockages or pressure issues in the vapor return system. By providing an area where vapor can collect and then gradually return to the tank, the belly pot mitigates the effects of insufficient slope, ensuring that the vapor recovery system remains functional and efficient. In contrast, a wet well primarily serves as a storage or collection basin for liquids, often used to manage groundwater or runoff. It does not address vapor retrieval specifically. Similarly, a drainage pit is designed for liquid drainage but does not apply directly to vapor return systems. An overflow tank is intended to handle excess liquid from a tank system, preventing overflows and maintaining system stability, but it does not solve the issue of inadequate vapor slope. Thus, the vapor belly pot is the correct solution for managing vapor return lines with insufficient slope.