Product levels must be at least how many inches above the highest opening at the bottom of the submerged drop tube to avoid noncompliance?

The requirement for product levels to be at least 4 inches above the highest opening at the bottom of the submerged drop tube is based on regulatory standards designed to minimize the risk of vapor release and to ensure efficient operation of vapor recovery systems. Maintaining this depth is crucial because it helps prevent the draw of vapors into the drop tube, which can happen if the product level is too low. This not only protects the environment by reducing emissions but also ensures that the system operates effectively without risking noncompliance with established regulations.

Understanding the implications of this requirement is essential for maintaining compliance and operational efficiency in Vapor Recovery operations, as failure to adhere to this standard can lead to significant issues both environmentally and legally.