Answer :
Final answer:
Plastic pipes, tubing, and fittings for fuel gas supply must conform to ASTM D2513 and be used both above and underground, as per safety and effectiveness standards.
Explanation:
The standards for plastic pipes, tubing, and fittings used in fuel gas supply systems are crucial for ensuring safety and effectiveness. According to the applicable standards, plastic pipes, tubing, and fittings used to supply fuel gas must conform to ASTM D2513 and must be used both above and underground. ASTM D2513 is a specification that outlines the requirements for polyethylene (PE) gas pipes and fittings, ensuring they are suitable for the pressures and temperatures they will encounter in gas distribution systems. This specification is critical for maintaining safety standards, preventing leaks, and ensuring the durability of the gas distribution infrastructure.