UL 58 (Underwriters Laboratories Standard 58)

UL 58 is a safety standard developed by Underwriters Laboratories that applies to underground piping systems, primarily those used for natural gas or propane. It ensures that these pipes are made from materials that can withstand environmental conditions and operational pressures without leaking or failing. The standard covers testing procedures, material requirements, and installation guidelines to promote safe and reliable underground piping. Compliance with UL 58 helps ensure that gas distribution systems are constructed and maintained to prevent leaks, reduce safety hazards, and support consistent performance throughout their service life.