What size is the clean-out line on an underground tank and where does it terminate outside the tank?

The clean-out line for an underground tank is typically designed to be ¾ inch in diameter, allowing for effective drainage and maintenance access. The termination of the clean-out line at 12 inches above ground level is crucial for a couple of reasons. First, it ensures that the opening is easily accessible for maintenance and inspections, allowing technicians to perform necessary tasks without digging or extensive effort. Second, positioning it above the ground level at this height helps prevent debris and contaminants from entering the clean-out line, which can compromise the integrity of the tank and the fluids it holds. This specification aligns with best practices for ensuring safe and efficient operations of underground fuel and water storage systems.