In what conditions should polyethylene piping typically be installed?

Polyethylene piping is designed to be used primarily for underground installations due to its resistance to corrosion and its ability to handle soil stresses. Installing it outside and underground protects it from physical damage and environmental factors, such as UV light and temperature fluctuations, which can degrade the material over time. This type of piping is specifically engineered to be buried in the ground, allowing it to remain safe from both external impacts and possible exposure to elements that could compromise its integrity.

The option referring to installation above ground with no cover would expose the piping to sunlight and potential mechanical damage, which is not advisable. Similarly, a restriction to warm climates does not align with the versatility and performance of polyethylene piping in various environments. Finally, limiting installation to inside service areas contradicts the purpose of this type of piping, which is designed for outdoor and underground applications where it can effectively manage propane distribution while ensuring safety and longevity.