CSLB C-36 Plumbing ContractorRough-in PlumbingMedium
A plumbing contractor is installing a new residential gas piping system. What is the minimum required depth of cover for an underground gas pipe located within a private driveway?
- A18 inches
- B24 inches
- C12 inches
- D6 inches
Show answer & explanationAnswer & explanation
Correct answer: A. 18 inches
According to plumbing codes, gas piping installed underground within a private driveway must have a minimum cover of 18 inches to protect it from damage due to vehicle traffic.
Why the other options are wrong
- B. 24 inches provides good protection but is not the minimum required by code for this specific scenario.
- C. 12 inches might be acceptable in non-traffic areas but is not enough for a driveway.
- D. 6 inches is generally insufficient for protection in a driveway area.
Underground Gas Pipe Cover (Driveway)
The minimum depth of soil or fill required above an underground gas pipe to protect it from external forces, especially in areas subjected to vehicle traffic.
- Protects against physical damage
- Varies by location (e.g., driveway vs. non-driveway)
- Ensures safety and integrity of the gas system
Memory trick: Different paths, different depths, always protect the pipe from harm.