MCC-NH Gas Fitters Practice Exam

If external damage is likely, what is the increased minimum cover depth for underground piping?

1. 12 inches

2. 18 inches

3. 24 inches

4. 30 inches

The correct answer is: 18 inches

The increased minimum cover depth for underground piping when external damage is likely is 18 inches. This depth is established to provide sufficient protection for the pipes against potential impacts from heavy loads above ground, such as vehicular traffic, construction activities, or natural settling. Choosing a depth of 18 inches ensures that the piping is adequately buried beneath the surface, which helps to safeguard it from physical damage that could cause leaks or system failures. This standard is often referenced in building codes and installation guidelines to ensure safety and longevity of the underground infrastructure. In contrast, the other depths suggested may not provide the same level of protection or may apply to different circumstances depending on the specific configuration and usage of the piping system. For instance, shallower covers might be acceptable in areas with minimal external pressure or activity, while deeper covers could be deemed unnecessary unless specific conditions warrant it. Therefore, the 18-inch cover depth strikes a balance between protection and practicality in scenarios where external damage is a concern.