NFPA 56: Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Pip

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Item #: NFPA_56
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2014 NFPA 56
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Charging or evacuating flammable gas piping systems can be a dangerous endeavor without proper safety protocols in place. NFPA 56: Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems provides a valuable foundation for making safety-related decisions while developing procedures for these activities.

The 2014 NFPA 56 contains many key requirements for ensuring the development of safe procedures for cleaning and purging flammable gas piping systems, including:

  • Identifying a safe discharge point
  • Notifying and training personnel involved in such activities
  • Preventing the development of a flammable gas mixture in occupied areas

The NFPA 56 framework can be adapted to almost any industrial environment where flammable gas is used. This edition has been updated to reflect some requirements where pressure relief valves and their associated piping are used to discharge gas during a cleaning or purging process. (In some plants, it is not possible to bypass the pressure relief devices during these steps.)

To get the latest standard on fire and explosion prevention during cleaning and purging, please request your copy of NFPA 56 today. (Softbound, 48 pp., 2014)

NFPA® 56: Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems 2014 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 General Requirements
4.1 Piping System Construction
4.2 Notification of Hazards
4.3 Cleaning and Purging Procedures
4.4 Safety Validation
4.5 Management of Change
4.6 Documentation
4.7 Notification of Hazards
4.8 Evacuation of Affected Area
4.9 Segment Cleaning
4.10 Hangers and Supports
4.11 Nonflammable Atmosphere
4.12 Utility Coordination
4.13 Restricted Access
4.14 Pressure Testing and Inspection
4.15 Hot Work Safety
Chapter 5 Training Requirements
5.1 Training
Chapter 6 Cleaning
6.1 Cleaning of Flammable Gas Piping
6.2 Acceptable Fluid Media
6.3 Temporary Power/Fuel Supply
6.4 Temporary Piping (Including Hose Assemblies)
6.5 Pig Cleaning
6.6 Target
6.7 Isolation and Protection of Clean Piping Systems or Segments
Chapter 7 Purging into Service
7.1 Charging Piping System with Flammable Gas
7.2 Discharge of Purged Gases
7.3 Detection Equipment
Chapter 8 Purging Out of Service
8.1 Isolation
8.2 Charging with Inert Gas
8.3 Discharge of Purged Gases
Annex A Explanatory Material
Annex B Purge End Points for Common Flammable Gases
Annex C Sample Purge Procedure
Annex D Informational References
Index