The 2006 edition of NFPA 52 Vehicular Fuel Systems Code addresses natural gas and hydrogen storage and refueling safety. Specifically, this document addresses the issues of: 1. Gas and liquefied gas storage 2. 14ehicle-dispensing operations 3. Gas PiPing 4. System siting 5. System. maintenance This article describes the hazards associated with the operations listed and bow the code sets requirements to mitigate these hazards. This document, which was initially issued in 1984, is the first edition of NFPA 52 that addresses hydrogen systems. (c) 2006 American Institute of Chemical Engineers.