How high must the unthreaded portion of a gas piping outlet extend above an outdoor patio?

• A. 1 inch
• B. 2 inches
• C. 3 inches
• D. 4 inches

Answer: (B)

The requirement for the unthreaded portion of a gas piping outlet to extend above an outdoor patio is designed to ensure safety. Specifically, it is established that the unthreaded portion must extend a minimum of 2 inches above any surface such as an outdoor patio.

This height is crucial because it helps to prevent the accumulation of gas near the ground level where it could pose a serious hazard. If the outlet were lower, there could be an increased risk of gas pooling in lower areas, which can be dangerous. By ensuring that the outlet is elevated, the potential for gas to disperse safely into the atmosphere is increased, thereby enhancing safety for anyone using the patio or nearby areas.

The selection of 2 inches is aligned with industry practices and safety standards, reflecting a balance between functionality and risk management in gas installations.