If a man-way weighs more than a single wall tank, what effect could that have on the tank?

A man-way that weighs more than a single-wall tank can lead to cracking of the tank. This occurs due to the additional stress placed on the tank as a result of the man-way's weight. If the weight distribution is not properly managed, or if the tank is not properly supported, the excessive weight can cause concentrated stress at points on the tank where the man-way is installed. Over time, this stress can lead to material fatigue and eventually result in cracks forming in the tank structure.

Cracking is particularly concerning because it can compromise the integrity of the tank, potentially leading to leaks and environmental harm, which is critical to address given the nature of underground storage tanks and the regulations governing their use. Proper design and installation practices must account for the weight of the man-way to ensure the overall structural integrity of the tank system.

Other options may suggest different issues, but none capture the direct relationship between the weight of the man-way and the potential for cracking that could arise from excessive stress on the tank.