NFPA 68: Standard on Explosion Protection by Deflagration Venting

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NFPA 68 includes the new best practices for Industrial fire protection and fire safety.

Updated based on technology changes, fire experience, and the latest fire safety practices, NFPA 68 Standard on Explosion Protection by Deflagration Venting applies to the design, location, installation, maintenance, and use of devices and systems that vent the combustion gases and pressures resulting from a deflagration within an enclosure so that structural and mechanical damage is minimized.

The Standard includes a performance-based option, including self-contained chapters supporting the performance-based aspect.

Important changes in the 2013 edition include:

  • Updated requirements for pressure vent manifolds
  • Updated method and equations for venting of gas mixtures
  • Added equations for venting of enclosures with initial pressures below atmospheric
  • A new section on bucket elevators
  • A new annex chapter on estimating fundamental burning velocities

Base your industrial fire protection strategies on the latest edition of NFPA 68. (Softbound, 80 pp., 2013)

NFPA 68 Standard on Explosion Protection by Deflagration Venting, 2013 Edition

Chapter 1 Administration
1.1 Scope
1.2 Purpose
1.3 Application
1.4 Equivalency
1.5 Retroactivity
1.6 Conversion Factors
1.7 Symbols
1.8 Pressure
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 Fundamentals of Venting of Deflagrations
6.1 Basic Concepts
6.2 Mixtures
6.3 Enclosure Design and Support
6.4 Enclosure Length-to-Diameter Ratio and Vent Variables
6.5 Vent Closure Operation
6.6 Consequences of a Deflagration
6.7 Effects of Vent Inertia
6.8 Effects of Vent Discharge Ducts
6.9 Venting with Flame Arresting and Particulate Retention
Chapter 7 Venting Deflagrations of Gas Mixtures and Mists
7.1 Introduction
7.2 Venting by Means of Low Inertia Vent Closures
7.3 Effects of Panel Inertia
7.4 Effects of Vent Ducts
7.5 Effects of Initial Elevated Pressure
7.6 Vent Design
7.7 Fireball Dimensions
7.8 Deflagration Venting of Enclosures Interconnected with Pipelines
Chapter 8 Venting of Deflagrations of Dusts and Hybrid Mixtures
8.1 Introduction
8.2 Venting by Means of Low-Inertia Vent Closures
8.3 Effects of Partial Volume
8.4 Effects of Initially Elevated or Subatmospheric Pressure
8.5 Effects of Vent Ducts
8.6 Bins, Hoppers, and Silos
8.7 Venting of Dust Collectors Using Bags, Filters, or Cartridges
8.8 Bucket Elevators
8.9 Fireball Dimensions
8.10 Venting Internal to a Building with Flame-Arresting and Particulate Retention Device
8.11 Venting Silos or Other Storage Vessel Provided with Integral Bin Vents
8.12 Deflagration Venting of Enclosures Interconnected with Pipelines
Chapter 9 Venting of Deflagrations of Gases and Dusts in Pipes and Ducts Operating at or Near Atmospheric Pressure
9.1 Introduction
9.2 Design
9.3 Multiple Deflagration Vents on a Pipe or Duct
Chapter 10 Details of Deflagration Vents and Vent Closures
10.1 Normally Open Vents
10.2 Normally Closed Vents
10.3 Types of Building or Room Vent Closures
10.4 Restraints for Large Panels
10.5 Equipment Vent Closures
Chapter 11 Inspection and Maintenance
11.1 General
11.2 Design Parameters and Documentation
11.3 Installation
11.4 Inspection
11.5 Procedures Following Vent Closure Actuation
11.6 Vent Closure Design Parameters
11.7 Inspection Reports
11.8 Recordkeeping
11.9 Management of Change
11.10 Maintenance
11.11 Employee Training
Annex A Explanatory Material
Annex B Fundamentals of Deflagration
Annex C Guidelines for Measuring Deflagration Parameters of Dusts
Annex D Deflagration Characteristics of Select Flammable Gases
Annex E Estimating Fundamental Burning Velocity
Annex F Deflagration Characteristics of Select Combustible Dusts
Annex G Calculation Method for Correction Factor Due to Increased Vent Panel Mass
Annex H Research Reports and Supporting Documents
Annex I Effect of Partial Volumes on Buildings — Example Problem
Annex J Bibliography
Annex K Informational References