NFPA 52, Vehicular Natural Gas Fuel Systems Code

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NFPA52

Help ensure safer and efficient use of CNG and LNG fuel systems and mitigate fire and explosion hazards.

With the steady rise in the use of cost-effective natural gas vehicles, it's critical to have access to the complete range of requirements for designing, installing, operating, and maintaining compressed natural gas (CNG) and liquefied natural gas (LNG) engine fuel systems and dispensing systems. NFPA 52, Vehicular Natural Gas Fuel Systems Code, offers in-depth instruction for helping to safeguard people and installations in a user-friendly format that’s easy to navigate and comprehend.

An essential for designers, engineers, maintenance professionals, facilities managers, contractors, and authorities having jurisdiction, NFPA 52 covers CNG and LNG systems on all types of vehicles and applies to facilities with LNG storage in containers of 100,000 gallons or less.

Additional subject areas include:

  • Fuel compression, processing, storage, and dispensing systems
  • CNG residential fueling facilities (RFF-CNGs)
  • CNG nonresidential fueling facilities
  • LNG fueling facilities
  • LNG fire protection
  • Installation of ASME tanks for LNG
  • LNG and CNG on commercial marine vessels and pleasure craft

The 2026 edition features routine updates to existing references and extracts, plus a complete review and reorganization of mandatory requirements and fuel system types.

Table of Contents

Chapter 1 Administration
1.1 Scope.
1.2 Purpose.
1.3 Retroactivity.
1.4 Alternate Provisions.
1.5 Training.
1.6 Units.
1.7 Enforcement.
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 CNG Facility Operations, Maintenance, and Management
4.1 General.
4.2 Reserved.
4.3 Qualifications.
4.4 Equipment Security.
4.5 Operations and Maintenance.
4.6 CNG Training.
4.7 Special Hazard Requirements.
4.8 Validation.
Chapter 5 Facility Fire Protection
5.1 General.
5.2 CNG Supplemental Requirements. (Reserved)
Chapter 6 CNG Facility Gas Detection, Alarm, and Emergency Shutdown Systems
6.1 General.
6.2 CNG Supplemental Requirements.
6.3 Emergency Shutdown System.
Chapter 7 Fuel Quality and Properties
7.1 CNG.
7.2 LNG. (Reserved)
Chapter 8 CNG Facility Equipment Components
8.1 Scope.
8.2 Application.
8.3 General.
8.4 Design and Construction of Containers.
8.5 Reserved.
8.6 ASME Compliance.
8.7 Pressure Gauges.
8.8 Valves and Related Components.
8.9 Piping, Tubing, and Fittings.
8.10 System Testing.
8.11 Electrical Equipment. (Reserved)
Chapter 9 CNG Major Fueling Equipment
9.1 Application.
9.2 General.
9.3 CNG Systems.
9.4 Outdoor Non-Public Fueling from Transport Vehicles Including Marine Vessels.
Chapter 10 Outdoor Installation of CNG Station Equipment and Dispensing
10.1 Scope.
10.2 General. (Reserved)
10.3 CNG Supplemental Requirements.
10.4 CNG Dispensing.
10.5 Siting.
10.6 Compression, Storage, and Dispensing Equipment Located Outdoors.
10.7 Electrical CNG Installations.
10.8 Signage.
10.9 CNG. (Reserved)
Chapter 11 Indoor Installation of CNG and LNG Station Equipment and Dispensing
11.1 Scope.
11.2 General. (Reserved)
11.3 CNG Supplemental Requirements.
11.4 CNG and LNG Building Construction.
11.5 Ventilation.
11.6 Building Shutoff Valves.
11.7 Reserved.
11.8 Residential Storage. (Reserved)
11.9 LNG Supplemental Requirements.
Chapter 12 CNG (Reserved)
Chapter 13 Residential CNG Fueling Appliances
13.1 Application.
13.2 System Component Qualifications.
13.3 General Safety Requirements.
13.4 Installation.
13.5 Installation of PRVs.
13.6 Installation of Pressure Gauges.
13.7 Pressure Regulation.
13.8 Piping and Hose.
13.9 Testing.
13.10 Operation.
13.11 Maintenance and Inspection.
Chapter 14 Nonresidential CNG Fueling Appliances
14.1 General.
14.2 Installation.
14.3 Operation.
14.4 Maintenance and Inspection.
Chapter 15 LNG Facility Management
15.1 Scope. (Reserved)
15.2 General. (Reserved)
15.3 Qualifications. (Reserved)
15.4 LNG Facility Maintenance.
15.5 Operations and Maintenance.
15.6 Operating Procedures Manual.
15.7 LNG Training.
Chapter 16 LNG Site Safety, Fire Protection, and Gas Detection
16.1 Application.
16.2 Fire Protection, Safety, and Security.
16.3 Reserved.
16.4 Ignition Source Control.
16.5 Vehicles.
16.6 Electrical Classifications.
16.7 Signage.
16.8 Emergency Response Measures.
16.9 LNG Supplemental Requirements.
16.10 Cargo Transport Unloading.
Chapter 17 LNG Fuel Quality (Reserved)
Chapter 18 LNG Fueling Station Equipment (Reserved)
Chapter 19 LNG Siting and Construction Requirements
19.1 General.
19.2 Siting.
19.3 Reserved.
19.4 Reserved.
19.5 Reserved.
19.6 LNG Supplemental Requirements.
19.7 Separation Distances.
Chapter 20 LNG Fueling
20.1 Application.
20.2 General.
20.3 LNG Dispensing.
20.4 LNG Storage.
20.5 Piping Systems and Components.
Chapter 21 Installation Requirements for ASME Tanks for LNG
21.1 Application.
21.2 General.
21.3 Containers.
21.4 Container Foundations and Supports.
21.5 Container Installation.
21.6 Automatic Product Retention Valves.
21.7 Inspection.
21.8 Testing and Purging of LNG Containers.
21.9 Piping.
21.10 Container Instrumentation.
21.11 Pressure Gauging and Control.
Chapter 22 LNG (Reserved)
Chapter 23 LCNG Requirements (Reserved)
Chapter 24 Automotive Equipment (Onboard)
24.1 Scope.
24.2 Application.
24.3 General.
24.4 CNG Supplemental Requirements.
24.5 LNG Supplemental Requirements.
Chapter 25 Automotive Fuel and Safety Systems (Onboard)
25.1 Application.
25.2 General.
25.3 CNG Engine Fuel Systems.
25.4 LNG Engine Fuel Systems.
Chapter 26 Reserved
Chapter 27 Reserved
Chapter 28 Marine Onboard (Reserved)
Chapter 29 Marine Refueling (Reserved)
Annex A Explanatory Material
Annex B Sample Ordinance Adopting NFPA 52
Annex C Pressure Relief Devices (PRDs)
Annex D Informational References

2026 ()

2023 (9781455929214)

2019 (9781455921447)

2010 (NFPA52-10)

More Information
Price$209.95
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Description

Help ensure safer and efficient use of CNG and LNG fuel systems and mitigate fire and explosion hazards.

With the steady rise in the use of cost-effective natural gas vehicles, it's critical to have access to the complete range of requirements for designing, installing, operating, and maintaining compressed natural gas (CNG) and liquefied natural gas (LNG) engine fuel systems and dispensing systems. NFPA 52, Vehicular Natural Gas Fuel Systems Code, offers in-depth instruction for helping to safeguard people and installations in a user-friendly format that’s easy to navigate and comprehend.

An essential for designers, engineers, maintenance professionals, facilities managers, contractors, and authorities having jurisdiction, NFPA 52 covers CNG and LNG systems on all types of vehicles and applies to facilities with LNG storage in containers of 100,000 gallons or less.

Additional subject areas include:

  • Fuel compression, processing, storage, and dispensing systems
  • CNG residential fueling facilities (RFF-CNGs)
  • CNG nonresidential fueling facilities
  • LNG fueling facilities
  • LNG fire protection
  • Installation of ASME tanks for LNG
  • LNG and CNG on commercial marine vessels and pleasure craft

The 2026 edition features routine updates to existing references and extracts, plus a complete review and reorganization of mandatory requirements and fuel system types.

Table of Contents

Chapter 1 Administration
1.1 Scope.
1.2 Purpose.
1.3 Retroactivity.
1.4 Alternate Provisions.
1.5 Training.
1.6 Units.
1.7 Enforcement.
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 CNG Facility Operations, Maintenance, and Management
4.1 General.
4.2 Reserved.
4.3 Qualifications.
4.4 Equipment Security.
4.5 Operations and Maintenance.
4.6 CNG Training.
4.7 Special Hazard Requirements.
4.8 Validation.
Chapter 5 Facility Fire Protection
5.1 General.
5.2 CNG Supplemental Requirements. (Reserved)
Chapter 6 CNG Facility Gas Detection, Alarm, and Emergency Shutdown Systems
6.1 General.
6.2 CNG Supplemental Requirements.
6.3 Emergency Shutdown System.
Chapter 7 Fuel Quality and Properties
7.1 CNG.
7.2 LNG. (Reserved)
Chapter 8 CNG Facility Equipment Components
8.1 Scope.
8.2 Application.
8.3 General.
8.4 Design and Construction of Containers.
8.5 Reserved.
8.6 ASME Compliance.
8.7 Pressure Gauges.
8.8 Valves and Related Components.
8.9 Piping, Tubing, and Fittings.
8.10 System Testing.
8.11 Electrical Equipment. (Reserved)
Chapter 9 CNG Major Fueling Equipment
9.1 Application.
9.2 General.
9.3 CNG Systems.
9.4 Outdoor Non-Public Fueling from Transport Vehicles Including Marine Vessels.
Chapter 10 Outdoor Installation of CNG Station Equipment and Dispensing
10.1 Scope.
10.2 General. (Reserved)
10.3 CNG Supplemental Requirements.
10.4 CNG Dispensing.
10.5 Siting.
10.6 Compression, Storage, and Dispensing Equipment Located Outdoors.
10.7 Electrical CNG Installations.
10.8 Signage.
10.9 CNG. (Reserved)
Chapter 11 Indoor Installation of CNG and LNG Station Equipment and Dispensing
11.1 Scope.
11.2 General. (Reserved)
11.3 CNG Supplemental Requirements.
11.4 CNG and LNG Building Construction.
11.5 Ventilation.
11.6 Building Shutoff Valves.
11.7 Reserved.
11.8 Residential Storage. (Reserved)
11.9 LNG Supplemental Requirements.
Chapter 12 CNG (Reserved)
Chapter 13 Residential CNG Fueling Appliances
13.1 Application.
13.2 System Component Qualifications.
13.3 General Safety Requirements.
13.4 Installation.
13.5 Installation of PRVs.
13.6 Installation of Pressure Gauges.
13.7 Pressure Regulation.
13.8 Piping and Hose.
13.9 Testing.
13.10 Operation.
13.11 Maintenance and Inspection.
Chapter 14 Nonresidential CNG Fueling Appliances
14.1 General.
14.2 Installation.
14.3 Operation.
14.4 Maintenance and Inspection.
Chapter 15 LNG Facility Management
15.1 Scope. (Reserved)
15.2 General. (Reserved)
15.3 Qualifications. (Reserved)
15.4 LNG Facility Maintenance.
15.5 Operations and Maintenance.
15.6 Operating Procedures Manual.
15.7 LNG Training.
Chapter 16 LNG Site Safety, Fire Protection, and Gas Detection
16.1 Application.
16.2 Fire Protection, Safety, and Security.
16.3 Reserved.
16.4 Ignition Source Control.
16.5 Vehicles.
16.6 Electrical Classifications.
16.7 Signage.
16.8 Emergency Response Measures.
16.9 LNG Supplemental Requirements.
16.10 Cargo Transport Unloading.
Chapter 17 LNG Fuel Quality (Reserved)
Chapter 18 LNG Fueling Station Equipment (Reserved)
Chapter 19 LNG Siting and Construction Requirements
19.1 General.
19.2 Siting.
19.3 Reserved.
19.4 Reserved.
19.5 Reserved.
19.6 LNG Supplemental Requirements.
19.7 Separation Distances.
Chapter 20 LNG Fueling
20.1 Application.
20.2 General.
20.3 LNG Dispensing.
20.4 LNG Storage.
20.5 Piping Systems and Components.
Chapter 21 Installation Requirements for ASME Tanks for LNG
21.1 Application.
21.2 General.
21.3 Containers.
21.4 Container Foundations and Supports.
21.5 Container Installation.
21.6 Automatic Product Retention Valves.
21.7 Inspection.
21.8 Testing and Purging of LNG Containers.
21.9 Piping.
21.10 Container Instrumentation.
21.11 Pressure Gauging and Control.
Chapter 22 LNG (Reserved)
Chapter 23 LCNG Requirements (Reserved)
Chapter 24 Automotive Equipment (Onboard)
24.1 Scope.
24.2 Application.
24.3 General.
24.4 CNG Supplemental Requirements.
24.5 LNG Supplemental Requirements.
Chapter 25 Automotive Fuel and Safety Systems (Onboard)
25.1 Application.
25.2 General.
25.3 CNG Engine Fuel Systems.
25.4 LNG Engine Fuel Systems.
Chapter 26 Reserved
Chapter 27 Reserved
Chapter 28 Marine Onboard (Reserved)
Chapter 29 Marine Refueling (Reserved)
Annex A Explanatory Material
Annex B Sample Ordinance Adopting NFPA 52
Annex C Pressure Relief Devices (PRDs)
Annex D Informational References

2026 ()

2023 (9781455929214)

2019 (9781455921447)

2010 (NFPA52-10)

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