NFPA® 56 (PS) Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems 2012 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