Why is double-walled piping preferred in vapor recovery systems?

Double-walled piping is preferred in vapor recovery systems primarily to prevent leaks and protect the environment. This design consists of two layers of piping, where the outer layer serves as a protective barrier around the inner layer. In the event of a failure or leak in the inner layer, the outer layer can contain any escaping vapors or liquids, preventing them from entering the environment. This secondary containment is crucial in minimizing the risk of contamination to soil and groundwater, which can occur when hazardous vapors or liquids escape into the environment.

Moreover, environmental regulations often mandate the use of double-walled systems in certain applications to enhance safety and reduce environmental impact. This requirement underscores the importance of safeguarding against leaks and ensuring compliance with environmental standards. The enhanced safety provided by double-walled piping contributes significantly to its preference in vapor recovery applications.