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 Coordination
1.4 Retroactivity
1.5 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 Temperature and Pressure
4.3 Notification of Hazards
4.4 Cleaning and Purging Procedures
4.5 Safety Validation
4.6 Management of Change
4.7 Documentation
4.8 Notification of Hazards
4.9 Evacuation of Affected Area
4.10 Segment Cleaning
4.11 Hangers and Supports
4.12 Nonflammable Atmosphere
4.13 Utility Coordination
4.14 Restricted Access
4.15 Hot Work Safety

Chapter 5 Training Requirements

5.1 Training

Chapter 6 Cleaning

6.1 Cleaning of Flammable Gas Piping
6.2 Cleaning 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
8.4 Detection Equipment

Annex A Explanatory Material
Annex B Purge End Points for Common Flammable Gases
Annex C Sample Purge Procedure
Annex D Informational References
Index