NFPA 69: Standard on Explosion Prevention Systems

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Prevent deflagration explosions due to combustible dust particles, gases or vapors with NFPA 69.

Combustible dust, gases and vapors produced in industrial settings can pose a significant safety hazard. NFPA 69: Standard on Explosion Prevention Systems offers definitive guidance on explosion protection and prevention systems.

This document is applicable to woodworking, grain processing (including sugar) and machining facilities, where combustible dust can spark explosions. It also covers facilities in which flammable liquids are used or petrochemical processing takes place -- and explosions due to combustible gases or vapors are a concern.

NFPA 69 has widespread applicability. Among the equipment protected are pipes, ductwork, vents, dust collection systems and granaries. In addition, systems for explosion prevention, explosion isolation, oxidant concentration control, fuel concentration control and ignition control are all designed in accordance with this standard.

The 2014 edition of NFPA 69 features:

  • Easier-to-understand explanations
  • Compatibility with NFPA 3: Recommended Practice for Commissioning and Integrated Testing of Fire Protection and Life Safety Systems terminology and other standards
  • Updated references and abstracts
  • New requirements for flow-actuated flap valves
  • A new annex on deflagration containment for two interconnected vessels

It also provides valuable insight on:

  • Installing an explosion isolation valve or system
  • Designing equipment to contain an explosion
  • Controlling your process to ensure an explosive atmosphere doesn't develop
  • Installing an explosion suppression system
  • Controlling ignition sources in your process before an explosion occurs

NFPA 69 is an essential resource for system designers, safety officers, insurers, municipal and state inspectors, and other professionals. Order your copy today to get the best guidance in the field on prevention and control of deflagrations. (Softbound, 79 pp., 2014)

NFPA® 69 Standard on Explosion Prevention Systems 2014 Edition

Chapter 1 Administration
1.1 Scope
1.2 Purpose
1.3 Application
1.4 Retroactivity
1.5 Equivalency
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 Requirements
4.1 Goal
4.2 Objectives
4.3 Compliance Options
Chapter 5 Performance-Based Design Option
5.1 General Requirements
5.2 Performance Criteria
Chapter 6 General Prescriptive Requirements
6.1 Methods
6.2 Limitations
6.3 Factors to Be Considered
6.4 Plans
6.5 System Acceptance
6.6 Inspection and Maintenance
6.7 Housekeeping
Chapter 7 Deflagration Prevention by Oxidant Concentration Reduction
7.1 Application
7.2 Design and Operating Requirements
7.3 Purge Gas Sources
7.4 Purge Gas Conditioning
7.5 Piping Systems
7.6 Application of Purge Gas at Points of Use
7.7 Instrumentation
Chapter 8 Deflagration Prevention by Combustible Concentration Reduction
8.1 Application
8.2 Basic Design Considerations
8.3 Design and Operating Requirements
8.4 Instrumentation
Chapter 9 Predeflagration Detection and Control of Ignition Sources
9.1 Application
9.2 Limitations
9.3 Optical Sensing System and Gas Sensing System Design Considerations
9.4 Testing
9.5 Protection System Design and Operation
9.6 System Manufacturer's Additional Responsibilities
9.7 Actuation of Other Devices and Systems
9.8 Process Shutdown
Chapter 10 Deflagration Control by Suppression
10.1 Application
10.2 Limitations
10.3 Personnel Safety
10.4 Basic Design Considerations
10.5 Control Panels
10.6 Detection Devices
10.7 Electrically Operated Actuating Devices
10.8 Suppressant and Suppressant Storage Containers
Chapter 11 Deflagration Control by Active Isolation
11.1 Application
11.2 Isolation Techniques
11.3 Personnel Safety
11.4 Basic Design and Operation
11.5 Detection Devices
11.6 Electrically Operated Actuating Devices
11.7 Control Panels
Chapter 12 Deflagration Control by Passive Isolation
12.1 Application
12.2 Passive Isolation Techniques
Chapter 13 Deflagration Control by Pressure Containment
13.1 Application
13.2 Design Limitations
13.3 Design Bases
13.4 Maintenance
13.5 Threaded Fasteners
13.6 Inspection After a Deflagration
Chapter 14 Passive Explosion Suppression Using Expanded Metal Mesh or Polymer Foams
14.1 Applications
14.2 Foam and Mesh Requirements
14.3 Expanded Metal Mesh and Polymer Foam Explosion Suppression Testing
14.4 Expanded Metal Mesh or Polymer Foam Installations
14.5 Expanded Metal Mesh or Polymer Foam Maintenance and Replacement
Chapter 15 Installation, Inspection, and Maintenance of Explosion Prevention Systems
15.1 General
15.2 Installation
15.3 Mechanical Installation
15.4 Agent, Agent Storage Containers, Automatic Fast-Acting Valves, Flame Arresters, and Flame Front Diverters
15.5 Electrical Installation
15.6 System Acceptance
15.7 Inspection
15.8 Procedures Following System Actuation
15.9 Recordkeeping
15.10 Personnel Safety and Training
15.11 Management of Change
15.12 Maintenance
Annex A Explanatory Material
Annex B Control of Flammable Gas Mixtures by Oxidant Concentration Reduction and Combustible Concentration Reduction
Annex C Limiting Oxidant Concentrations
Annex D Ventilation Calculations
Annex E Purging Methods
Annex F Flame Arresters
Annex G Deflagration Containment Calculation Method for Two Interconnected Vessels
Annex H Informational References