Above ground gas piping installed outdoors must be elevated above the grade by at least how many inches?

The correct answer is based on safety regulations and standards for gas piping installations. Above ground gas piping that is installed outdoors must be elevated above the grade by at least 3 1/2 inches to prevent potential issues such as flooding, debris accumulation, and physical damage. This elevation helps ensure that the piping remains clear of surface water, which could cause corrosion or other integrity issues over time. Proper elevation also reduces the risk of the piping being impacted by snow, leaves, or other obstructions that could compromise its function or safety.

While there are various requirements for different types of installations and areas, the standard for outdoor gas piping specifically states this minimum elevation to protect both the gas distribution system and the surrounding environment. The emphasis on 3 1/2 inches marks a balance between ensuring adequate clearance while not being excessively high, which could lead to other practical challenges during installation or maintenance.