Is it permissible to use polyethylene pipe for above ground fuel supply to an LP-gas system?

The correct answer indicates that it is not permissible to use polyethylene pipe for above ground fuel supply to an LP-gas system due to safety and performance concerns. NFPA 58 outlines specific guidelines regarding materials that can be used in LPG systems to ensure that they can safely handle the pressures and chemical characteristics of liquefied petroleum gas.

Polyethylene, while suitable for certain underground applications due to its resistance to corrosion and physical flexibility, is not designed to withstand the conditions present above ground when used in fuel supply systems. Above ground, exposure to UV radiation, temperature fluctuations, and physical damage can compromise the integrity of polyethylene pipes, leading to potential leaks and safety hazards.

In contrast, above ground systems typically require materials that are more robust, such as steel or approved metallic piping, which can handle the environmental conditions and provide an additional layer of safety against leaks and ruptures. This strict adherence to approved materials in LP-gas installations is essential for maintaining safety standards and preventing potential failures.