NFPA 91: Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible

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Item #: NFPA_91
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2015 NFPA 91
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Comprehensive new 2015 NFPA 91 helps prevent exhaust systems from spreading fire and increasing explosion risks.

Minimize the probability of a fire or explosion -- or loss from a fire or explosion -- with the 2015 edition of NFPA 91. Renamed to reflect a broader scope, NFPA 91: Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Particulate Solids provides minimum requirements for the design, construction, installation, operation, testing, and maintenance of these systems except as modified or amplified by other applicable NFPA® standards.

Changes reflect NFPA 91's expanded scope:

  • The Standard's new title and scope reflect that NFPA 91 is referenced for pneumatic conveying, duct design, and air moving device requirements within the commodity-specific combustible particulate and combustible dust standards.
  • Added definitions such as limited combustible and non-combustible were added for enhanced clarity and consistency with the 2013 NFPA 654: Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particular Solids, along with other combustible dust documents.

The 2015 NFPA 91 is essential for process industries in which there is production or release of gases, vapors, or solids that are pneumatically conveyed through duct systems. It's a must for design engineers, fire protection engineers, safety and health professionals, industrial hygienists, and fire and building officials. (Softbound, 22 pp., 2015)

NFPA® 91 Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Particulate Solids 2015 Edition

Chapter 1 Administration
1.1 Scope
1.2 Purpose
1.3 Retroactivity
1.4 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 Design and Construction
4.1 Terminology
4.2 General Requirements
4.3 Duct Material and Construction
4.4 Access
4.5 Design Requirements
4.6 Hangers and Supports
4.7 Duct Installation
Chapter 5 Corrosive Materials
5.1 General
Chapter 6 Air-Moving Devices
6.1 General
6.2 Flammable or Combustible Materials
6.3 Clearance
6.4 Alignment
6.5 Maintenance and Inspection
6.6 Location
6.7 Flexible Connections
Chapter 7 Air–Material Separators (Air Separation Devices)
7.1 General Requirements
7.2 Separators for Noncombustible Particulates
7.3 Separators for Flammable Gases, Vapors, and Mists
Chapter 8 Ignition Sources
8.1 Electrical Equipment
8.2 Static Electricity
8.3 Manifolds
8.4 Open Flames and Sparks
8.5 Removal of Ferrous Materials
8.6 Belt Drives
8.7 Bearings
8.8 Equipment
Chapter 9 Fire Protection
9.1 General
9.2 Drainage
9.3 Testing and Inspection
Chapter 10 Testing and Maintenance
10.1 Retroactivity
10.2 General
10.3 System Test
10.4 System Inspection
10.5 Cleanliness
10.6 Maintenance Program
10.7 Maintenance Log
Annex A Explanatory Material
Annex B Informational References
Index