How far should suction and fill lines be installed from the tank bottom?

The correct answer is that suction and fill lines should be installed at least 4 inches from the bottom of the tank. This distance is essential to prevent sediment and sludge from entering the lines, which can lead to operational issues and contamination. Keeping the suction and fill lines elevated helps ensure that only the cleanest and most usable product is being drawn from or added to the tank. This practice also aids in preventing pump damage and maintains the efficiency of the fuel delivery system.

Additionally, this standard distance is also a safety measure, as it reduces the risk of pump cavitation caused by debris blockage and helps to ensure that the system runs smoothly. Understanding this regulation is crucial for maintaining compliance with UST operational procedures and for the proper functioning of tank systems.