Technical Standards and Safety Authority (TSSA) G3 Practice Exam

What is the minimum depth a gas line must be buried under a lawn?

1. 12 in. (300 mm)

2. 15 in. (380 mm)

3. 18 in. (460 mm)

4. 20 in. (500 mm)

The correct answer is: 15 in. (380 mm)

The minimum depth that a gas line must be buried under a lawn is 15 inches (380 mm). This depth is specified to ensure the safety of underground gas pipelines and to reduce the risk of damage from surface activities, such as landscaping or foot traffic. Buried gas lines at this depth are less likely to be accidentally struck during routine yard maintenance and other activities, which helps prevent leaks and potential hazards associated with gas lines. In the context of safety regulations, which must be adhered to ensure the protection of both the public and the infrastructure, this standard is derived from industry practices and local codes. It aids in maintaining a safe environment while allowing for standard lawn care and use in residential areas.