NFPA 68: Standard on Explosion Protection by Deflagration Venting 2023

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NFPA 68: Standard on Explosion Protection by Deflagration Venting

Published By	Publication Date	Number of Pages
NFPA	2023	105

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Category: NFPA

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PDF Catalog

PDF Pages	PDF Title
10	Chapter 1 Administration 1.1 Scope. 1.2 Purpose. 1.3 Application. 1.4 Retroactivity. 1.5 Equivalency. 1.6 Conversion Factors.
11	1.7 Symbols. 1.8 Pressure. Chapter 2 Referenced Publications 2.1 General. 2.2 NFPA Publications.
12	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.
14	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.
15	Chapter 6 Fundamentals of Venting of Deflagrations 6.1 Basic Concepts. 6.2 Mixtures. 6.3 Enclosure Design and Support.
17	6.4 Enclosure Length-to-Diameter Ratio and Vent Variables. 6.5 Vent Closure Operation.
18	6.6 Consequences of a Deflagration. 6.7 Effects of Vent Inertia.
19	6.8 Fireball Dimensions.
20	6.9 Effects of Vent Discharge Ducts. 6.10 Venting with Flame Arresting and Particulate Retention.
21	Chapter 7 Venting Deflagrations of Gas Mixtures and Mists 7.1 Introduction. 7.2 Venting by Means of Low Inertia Vent Closures.
23	7.3 Partial Volume Effects. 7.4 Effects of Panel Inertia.
24	7.5 Effects of Vent Ducts. 7.6 Deflagration Venting of Enclosures Interconnected with Pipelines. Chapter 8 Venting of Deflagrations of Dusts and Hybrid Mixtures 8.1 Introduction.
25	8.2 Venting by Means of Low-Inertia Vent Closures.
26	8.3 Effects of Panel Inertia.
27	8.4 Effects of Partial Volume.
29	8.5 Effects of Vent Ducts. 8.6 Bins, Hoppers, and Silos.
30	8.7 Venting of Dust Collectors Using Bags, Filters, or Cartridges. 8.8 Bucket Elevators.
31	8.9 Venting Internal to a Building with Flame-Arresting and Particulate Retention Device. 8.10 Venting Silos or Other Storage Vessel Provided with Integral Bin Vents.
32	8.11 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.
33	9.3 Multiple Deflagration Vents on a Pipe or Duct. Chapter 10 Details of Deflagration Vents and Vent Closures 10.1 Normally Open Vents.
34	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.
35	Chapter 11 Inspection and Maintenance 11.1 General. 11.2 Design Parameters and Documentation. 11.3 Installation. 11.4 Inspection.
36	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.
37	Annex A Explanatory Material
66	Annex B Fundamentals of Deflagration
71	Annex C Guidelines for Measuring Deflagration Parameters of Dusts
74	Annex D Deflagration Characteristics of Select Flammable Gases
79	Annex E Estimating Fundamental Burning Velocity
80	Annex F Deflagration Characteristics of Select Combustible Dusts
82	Annex G Calculation Method for Correction Factor Due to Increased Vent Panel Mass
85	Annex H Research Reports and Supporting Documents
86	Annex I Full and Partial Volume Gas Venting of a Building — Example Problem
93	Annex J Effect of Dust Partial Volumes on Venting of Buildings — Example Problem
94	Annex K Example Vent Sizing for Hydrogen Mixtures
95	Annex L Bibliography
98	Annex M Informational References