What is the installation limitation for plastic piping for fuel gas?

The installation limitation for plastic piping for fuel gas primarily revolves around its ability to withstand environmental factors and ensure safety in gas distribution. The correct answer indicates that plastic piping must be used outdoors and underground only. This is because plastic piping is designed to be resistant to corrosion and degradation from environmental elements, making it suitable for underground installations where protection from physical damage and exposure to elements is critical.

Installing plastic piping underground helps to avoid issues associated with temperature fluctuations, moisture, and potential interaction with other environmental factors that could compromise the integrity of the piping if exposed above ground. Moreover, safety regulations often dictate that fuel gas systems must minimize the risk of leaks, which can be more easily managed when using materials like plastic in a controlled environment, such as underground.

This requirement also ensures that the piping does not undergo excessive wear from UV exposure or potential physical damage from outdoor activities, reinforcing the safety of the overall gas system.