Codes developed by the National Fire Protection Association and applied at facilities where flammable and combustible liquids are stored and dispensed.

NFPA 30 is entitled Flammable and Combustible Liquids Code. NFPA 30A is entitled Automotive and Marine Service Station Code.

These two codes have become very important to designers, installers, and operators of petroleum marketing facilities. The codes prescribe details, such as the required distance between tanks. Many city, county, and state governmental agencies adopt the codes and thus give them the status of enforceable law.