NFPA 329:2025

Chapter 1 Administration 1.1 Scope. 1.2 Purpose. 1.3 Application. (Reserved) 1.4 Retroactivity. 1.5 Equivalency. 1.6 Units and Formulas. (Reserved) Chapter 2 Referenced Publications 2.1 General. 2.2 NFPA Publications. 2.3 Other Publications. 2.4 References for Extracts in Recommendations Sections. Chapter 3 Definitions 3.1 General. 3.2 NFPA Official Definitions. 3.3 General Definitions. Chapter 4 Flammable and Combustible Liquids and Gases 4.1 General. 4.2 Fires and Explosions. 4.3 Sources of Ignition. Chapter 5 Initial Response 5.1 Indicators of a Release. 5.2 Initial Response to Physical Discovery. 5.3 Eliminating Sources of Ignition. 5.4 Entering the Area. 5.5 Initial Response to Indications of a Potential Release. Chapter 6 Searching for the Source 6.1 General. 6.2 Search Procedure. 6.3 Procedures to Verify the Source. Chapter 7 Detecting Releases from Tanks and Piping 7.1 General. 7.2 Action Preliminary to Release Detection or Tightness Testing. 7.3 Release Detection. 7.4 Testing of Underground Tanks. 7.5 Testing of Underground Piping. 7.6 Testing of Aboveground Storage Tanks (ASTs). Chapter 8 Tracing Liquids Underground 8.1 General. 8.2 Procedure for Determining Underground Flow. 8.3 Dye Tracing. 8.4 Chromatographic and Spectrographic Analyses. 8.5 Other Chemical Analyses. 8.6 Other Sources. Chapter 9 Removal and Disposal of Flammable and Combustible Liquids 9.1 General. 9.2 Basements. 9.3 Subways, Tunnels, and Mines. 9.4 Normally Uninhabited Structures — Utility Conduits. 9.5 Normally Uninhabited Structures — Sewers. 9.6 Underground Release. Annex A Explanatory Material Annex B Examples of Sources of Flammable and Combustible Liquids and Vapors Annex C Basic Principles and Concepts of Underground Flow Annex D Sources of Damage to Storage Containers and Lines Annex E Inventory Control Procedures Annex F Informational References

This recommended practice provides methods for responding to fire and explosion hazards resulting from the release of a flammable or combustible liquid, gas, or vapor that can migrate to a subsurface structure.