NFPA 484 PDF

Highlights

Changes throughout the 2022 edition of NFPA 484, Standard for Combustible Metals, can help you apply the standard correctly in different work environments.
This edition of the standard has been reorganized so that the first nine chapters correlate with the topics covered in NFPA 652, Standard on the Fundamentals of Combustible Dust, as well as to organize the remaining chapters to ensure the first nine chapters do not conflict with other sections of the standard. Chapter 13, Additive Manufacturing, was also revised to address the following:
The growing utilization of metal powders in additive manufacturing
Dust hazard analysis
Location of emergency shutdown controls
Harvesting printed objects
Powder storage
Operator training
Further updates for the 2022 edition of NFPA 484, Standard for Combustible Metals, include the following:
A new requirement for the Kst value to be doubled for certain metals — unless their explosibility characteristics are determined in a 1 m3 or larger test vessel — has been added, in addition to annex material to help explain this requirement.
The requirements for fire detection for dry-type air-material separators have been revised to allow for the use of methods other than surface-mounted devices and to require that all filter locations (if present) be monitored.
Chapter 15, Legacy Metals, has been reorganized to consolidate the requirements that apply to all legacy metals.
(Print, 160 pp., 2022)

Table of Contents

NFPA® 484 Standard for Combustible Metals 2022 Edition
Chapter 1 Administration
1.1 Scope.
1.2 Purpose.
1.3 Application.
1.4 Conflicts.
1.5 Retroactivity.
1.6 Equivalency.
1.7 Units and Formulas.
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 General.
4.2 Objectives.
Chapter 5 Hazard Identification — Determination of the Combustibility or Explosibility of a Metal, Metal Powder, or Metal Dust
5.1 Responsibility.
5.2 Overview.
5.3 Basic Material Characterization.
5.4 Determination of Combustibility.
5.5 Determination of Explosibility.
5.6 Use of Test Data for Hazard Analysis.
5.7 Determination of Flash-Fire Potential. (Reserved)
5.8 Organometallic Materials. (Reserved)
Chapter 6 Performance-Based Design Option
6.1 General Requirements.
6.2 Design Objectives.
6.3 Performance Criteria.
6.4 Design Scenarios.
6.5 Evaluation of Proposed Design.
6.6 Retained Prescriptive Requirements.
Chapter 7 Hazard Analysis
7.1 General Requirements.
7.2 Dust Hazard Analysis (DHA).
7.3 Molten Metal Hazard Analysis.
7.4 Risk Evaluation.
7.5 Dust Explosion and Flash-Fire Hazard Areas.
Chapter 8 Management Systems
8.1 Retroactivity.
8.2 General.
8.3 Operating Procedures and Practices.
8.4 Housekeeping.
8.5 Hot Work.
8.6 Personal Protective Equipment (PPE).
8.7 Inspection, Testing, and Maintenance.
8.8 Training and Hazard Awareness.
8.9 Contractors.
8.10 Emergency Planning and Response.
8.11 Incident Investigation.
8.12 Management of Change.
8.13 Documentation Retention.
8.14 Management Systems Review.
8.15 Employee Participation.
Chapter 9 Hazard Management: Mitigation and Prevention
9.1 Inherently Safer Designs.
9.2 Building Design.
9.3 Equipment Design.
9.4 Ignition Source Control.
9.5 Pyrophoric Dusts. (Reserved)
9.6 Dust Control.
9.7 Explosion Prevention/Protection.
9.8 Fire Protection.
Chapter 10 Fire Prevention, Fire Protection, and Emergency Response
10.1 Retroactivity.
10.2 General.
10.3 Operating Procedures and Practices.
10.4 Fire Prevention.
10.5 Fire Protection.
10.6 Training and Hazard Awareness.
10.7 Emergency Planning/Preparedness and Response.
10.8 Emergency Response.
10.9 Incident Investigation.
Chapter 11 Housekeeping
11.1 Retroactivity.
11.2 Applicability.
11.3 Housekeeping Plan.
11.4 Cleanup Procedures for Fugitive Dust Accumulations.
11.5 Cleanup of Spilled Dust, Fine or Powder.
11.6 Vacuum Cleaning.
11.7 Compressed Air Cleaning Requirements.
11.8 Water-Cleaning Requirements.
11.9 Cleaning Frequency.
11.10 General Precautions.
Chapter 12 Control of Ignition Sources
12.1 Retroactivity.
12.2 Hot Work.
12.3 Control of Friction Hazards.
12.4 Electrical Area Classification.
12.5 Portable Electrical and Electronic Equipment.
Chapter 13 Pneumatic Conveying, Dust Collection, and Centralized Vacuum Cleaning Systems
13.1 Retroactivity.
13.2 Dust Collection.
13.3 Centralized Vacuum Cleaning System.
13.4 Portable Vacuum Cleaners.
13.5 Pneumatic Conveying of Powder.
13.6 Powder Collection.
Chapter 14 Nanometal Powders
14.1 Retroactivity.
14.2 General.
14.3 Nanoparticle Production Processes.
14.4 Equipment Design and Operation.
14.5 Housekeeping.
Chapter 15 Additive Manufacturing
15.1 Retroactivity.
15.2 General Requirements.
15.3 Additive Manufacturing Equipment and Operations.
15.4 Equipment and Object Cleaning.
15.5 Training.
15.6 Emergency Response.
Chapter 16 Alkali Metals
16.1 General Provisions.
16.2 Facility Design Requirements.
16.3 Primary Metal Production.
16.4 Powder Production. (Reserved)
16.5 End Users of Powder. (Reserved)
16.6 Processing and Handling.
16.7 Machining, Fabrication, Finishing, and Media Blasting.
16.8 Storage and Handling.
16.9 Fire and Explosion Protection.
16.10 Other. (Reserved)
Chapter 17 Legacy Metals
17.1 General.
17.2 Facility Design Requirements.
17.3 Primary Metal Production (Smelting).
17.4 Powder Production.
17.5 End Users of Powder.
17.6 Processing and Handling.
17.7 Machining, Fabrication, Finishing, and Media Blasting.
17.8 Storage and Handling.
17.9 Fire and Explosion Prevention.
Chapter 18 Other Metals
18.1 General Provisions.
18.2 Facility Design Requirements.
18.3 Primary Metal Production.
18.4 Powder Production.
18.5 End Users of Powder.
18.6 Processing.
18.7 Machining, Fabrication, Finishing, and Media Blasting.
18.8 Storage and Handling.
18.9 Fire and Explosion Prevention.
18.10 Other. (Reserved)
Chapter 19 Recycling and Waste Management Facilities
19.1 General Provisions.
19.2 Recycling and Waste Management of Combustible Metal — Collection, Storage, and Handling of Fines Generated During Scrap Receiving, Storage, Recycling, and Waste Treatment.
19.3 Storage of Combustible Metals for Recycling and Waste Management.
19.4 Sample Identification and Collection for Metals in a Combustible Form.
19.5 Personal Protective Equipment (PPE).
19.6 Reactivity.
19.7 Management of Change.
19.8 Facility Design Requirements.
19.9 Emergency Preparedness.
19.10 Processing.
19.11 Fire and Explosion Prevention.
Annex A Explanatory Material
Annex B Electrically Conductive Floors
Annex C Supplementary Information on Magnesium
Annex D Design for Dust Concentration Control in Ductwork
Annex E Supplementary Information on Tantalum
Annex F Supplementary Information on Titanium
Annex G Supplementary Information on Zirconium
Annex H Extinguishing Agents That Should Not Be Used on Lithium Fires
Annex I Testing for Detailed Characterization of Explosive Behavior of Materials
Annex J Informational References