NFPA 770:2021

Chapter 1 Administration 1.1 Scope. 1.2 Purpose. 1.3 Retroactivity. 1.4 Equivalency. 1.5 Units of Measurement. Chapter 2 Referenced Publications 2.1 General. 2.2 NFPA Publications. 2.3 Other Publications. 2.4 References for Extracts in Mandatory Sections. Chapter 3 Definitions 3.1 General. 3.2 NFPA Official Definitions. 3.3 General Definitions Chapter 4 General Information 4.1 Use and Limitations. 4.2 Safety Considerations. 4.3 Use Restrictions 4.4 Qualifications. Chapter 5 Components 5.1 Water Supply. 5.2 Inert Gas Agent Supply. 5.3 Storage Containers. 5.4 Pipe, Fittings, and Valves. 5.5 Hybrid Nozzles. 5.6 Detection, Actuation, Alarm, and Control Systems. Chapter 6 Application and Fire Test Protocols 6.1 General. 6.2 Listing or Approval Evaluations. 6.3 Performance Objectives. 6.4 Application Parameters. 6.5 Flooding Factor. Chapter 7 System Design Requirements 7.1 General. 7.2 Pipe Network Layout and Design. Chapter 8 Design Requirements for Total Flooding Systems 8.1 General. 8.2 Enclosure Requirements. 8.3 System Performance Characteristics. 8.4 Hybrid Media Quantity. 8.5 Concentration of Oxygen. 8.6 Hybrid Media Retention for Prevention of Re-ignition. 8.7 Hybrid Nozzle Selection, Quantity, and Location. Chapter 9 Design Requirements for Local Application Systems 9.1 General. 9.2 Hazard Specifications. 9.3 Nozzle Selection, Quantity, and Location. 9.4 Discharge Rate. 9.5 Discharge Time. 9.6 Hybrid Media Quantity. Chapter 10 Design Requirements for Marine Systems (Reserved) Chapter 11 System Documentation 11.1 System Working Plans. 11.2 System Flow Documentation. 11.3 Detection, Actuation, and Control Systems Documentation. 11.4 Owner’s Documentation. 11.5 System Information Sign. Chapter 12 Installation Requirements 12.1 General. 12.2 Nozzles. 12.3 Hazardous Locations. 12.4 Electrical Clearances. 12.5 Pipe Network. 12.6 Gas and Water Storage Containers. 12.7 Valves and Pressure Gauges. 12.8 Electrical Equipment and Systems. 12.9 System Review and Testing. Chapter 13 Acceptance Testing 13.1 Approval of Installations. 13.2 Acceptance Requirements. 13.3 System Design Information Sign. 13.4 Owner’s Documentation. Chapter 14 Inspection, Testing, and Maintenance 14.1 General. 14.2 Periodic Inspection and Maintenance. 14.3 Hose Test. 14.4 Inert Gas Agent Container Test. 14.5 Water Storage Container Inspection and Test. 14.6 Actuation/Impairment. 14.7 Training. 14.8 Corrections and Repairs. Chapter 15 Impairment 15.1 General. 15.2 Impairment Coordinator. 15.3 Tag Impairment System. 15.4 Impaired Equipment. 15.5 Preplanned Impairment Programs. 15.6 Emergency Impairments. 15.7 Restoring Systems to Service. Annex A Explanatory Material Annex B Fire Test Methods Annex C Informational References

This standard contains the minimum requirements for the design, installation, acceptance, inspection, testing, and maintenance of hybrid fire-extinguishing systems that use a combination of atomized water and inert gas to extinguish fire.