When can 18-inch cover for piping be reduced to 12 inches?

The correct answer indicates that the minimum cover requirement for piping can be reduced from 18 inches to 12 inches if the piping is located in an area that is not subjected to traffic. This is based on safety standards and regulations that allow for more flexible requirements in specific situations where the risk of damage to the pipes is lower.

When piping is installed away from areas where vehicles or heavy loads are likely to be present, the risk of impact that could compromise the integrity of the piping is minimized. As a result, it is permissible to reduce the cover depth.

In contrast, scenarios involving traffic or buildings would often necessitate maintaining a greater depth to protect the piping from potential damage. Therefore, options suggesting a reduction in cover when traffic is present or when under buildings do not align with established safety practices. Maintaining a deeper cover in those situations ensures greater protection and compliance with regulatory requirements.