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Guidelines for Safe Storage and Handling of Reactive Materials

ISBN: 978-0-8169-0629-1
364 pages
September 1995
Guidelines for Safe Storage and Handling of Reactive Materials (0816906297) cover image


With new and growing interest in dealing with the hazards of reactive chemicals, this book offers guidelines that can significantly reduce the risk or mitigate the severity of accidents associated with storing and handling reactive materials. Necessary elements of a reliable system to prevent equipment or human failures that might lead to a reactive chemical incident are sound and responsible management policies, together with a combination of superior siting, design, fabrication, erection, inspection, monitoring, maintenance, operations and maintenance of facilities. These Guidelines deal with all of these elements with emphasis on design considerations.
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Table of Contents





1. Chemical Reactivity Hazards.

1.1 Framework for Understanding Reactivity Hazards.

1.1.1 Grouping of Reactivity Hazards into General Categories.

1.1.2 Key Parameters That Drive Reactions.

1.1.3 Types of Runaway Reactions.

1.1.4 How Reactive Chemical Storage and Handling Accidents Are Initiated.

1.2 Self-Reactive Polymerizing Chemicals.

1.2.1 Thermal Instability.

1.2.2 Induction Time.

1.2.3 Example.

1.3 Self-Reactive Decomposing Chemicals.

1.3.1 Peroxides.

1.3.2 Self-Accelerating Decomposition Temperature.

1.3.3 Predicting Instability Potential.

1.3.4 Deflagration and Detonation of Pure Material.

1.3.5 Slow Gas-Forming Reactions.

1.3.6 Heat of Compression.

1.3.7 Minimum Pressure for Vapor Decomposition.

1.3.8 Shock Sensitivity.

1.3.9 Examples of Shock Sensitivity.

1.4 Self-Reactive Rearranging Chemicals.

1.4.1 Isomerization.

1.4.2 Disproportionation.

1.5 Reactivity with Oxygen.

1.5.1 Spontaneous Ignition and Pyrophoricity.

1.5.2 Pyrophoricity versus Hypergolic Properties.

1.5.3 Accumulation and Explosion of Pyrophoric Materials.

1.5.4 Competition between Air and Atmosphere Moisture.

1.5.5 Peroxide Formation.

1.6 Reactivity with Water.

1.6.1 Water Reactivity: Fast and Slow Reactions.

1.6.2 Water-Reactive Structures.

1.7 Reactivity with Other Common Substances.

1.7.1 Reactions with Metals.

1.7.2 Surface Area Effects.

1.7.3 Catalyst Deactivation and Surface Passivation.

1.8 Reactive with Other Chemicals Incompatibility.

1.8.1 Oxidizing and Reducing Properties.

1.8.2 Acidic and basic Properties.

1.8.3 Formation of Unstable Materials.

1.8.4 Thermite-Type Reactions.

1.8.5 Incompatibility with Heat Transfer Fluids and Refrigerants.

1.8.6 Adsorbents.


2. Chemical Reactivity Classifications.

2.1 NFPA Reactivity Hazard Signal.

2.1.1 NFPA 704 Rating System for Overall Reactivity.

2.1.2 Definitions for Reactivity Signal Ratings.

2.1.3 Reactivity Hazards Not Identified by NFPA 704.

2.1.4 NFPA Reactivity Ratings for Specific Chemicals.

2.2 NPCA Hazardous Materials Identification System.

2.3 Classifications of Organic Peroxides.

2.3.1 SPI 19A Classification of Organic Peroxides.

2.3.2 NFPA 43B Classification of Organic Peroxides.

2.4 Classification of Materials That Form Peroxides.

2.5 Classification of Water-Reactive Materials.

2.5.1 Materials That React Violently with Water.

2.5.2 Materials That React Slowly with Water.


3. Materials Assessment.

3.1 Prior Experience Review.

3.1.1 Common Knowledge.

3.1.2 Analogy.

3.1.3 Safety Data and Literature.

3.2 Theoretical Evaluations.

3.2.1 Unstable Atomic Groups.

3.2.2 Oxygen Balance.

3.2.3 Thermodynamics: Heat of

3.2.4 Thermodynamics: Heats of Reaction and Self-Reaction.

3.2.5 Thermodynamics: Equilibrium Considerations.

3.2.6 CHETAH.

3.2.7 Example Evaluation.

3.3 Expert Determination.

3.3.1 Expert Committees.

3.3.2 Kinetics Determination Factors.

3.4 Reactivity Screening Tests.

3.4.1 Thermal Stability Screening Tests.

3.4.2 Shock Sensitivity Screening.

3.4.3 Pyrophoricity Screening.

3.4.4 Water Reactivity Screening.

3.4.5 Peroxide Formation Screening.

3.4.6 Compatibility Screening.


4. Consequence Analysis.

4.1 Identifying Potential Accident Scenarios.

4.1.1 Process Hazard Analysis.

4.1.2 Checklist of Potentially Hazardous Events.

4.1.3 Chemical Interaction Matrix.

4.1.4 Industry Experience.

4.1.5 Local Size Experience.

4.2 Severity Testing.

4.2.1 Calorimetric Testing for Consequence Analysis.

4.2.2 Self-Accelerating Decomposition Temperature.

4.2.3 Isoperibolic Calorimetry.

4.2.4 Assessment of Maximum Pressure and Temperature.

4.3 Where to Find Methods for Estimating Immediate Consequences.

4.3.1 Reactive Chemical Explosions.

4.3.2 Reactive Chemical Fires.

4.3.3 Toxic Releases.

4.4 Where to Find Methods for Estimating Immediate Impact.

4.4.1 Explosion Effect Models.

4.4.2 Thermal Effect Models.

4.4.3 Toxic Gas Effect Models.

4.4.4 Modeling Systems.

4.4.5 Caveats.

4.5 Applications of Consequence Analysis.

4.5.1 Selection of Size, Quantity, and Location of Facilities.

4.5.2 Selection of Dedicated Safeguard Systems.

4.5.3 Basis for Emergency Response Systems and Planning.

4.5.4 Better Understanding of the Hazard and the Consequences.

4.5.5 Significant Step toward a Well-Managed Operating Facility.


5. General Design Considerations.

5.1 Summary of General Design Strategies.

5.1.1 Reduce the Inherent Hazards.

5.1.2 Build Reliable Safety Layers.

5.1.3 Conduct In-Depth Reviews.

5.1.4 Use Previous Experience.

5.2 Compatibility.

5.2.1 Identifying Potential Incompatibility Problems.

5.2.2 Compatibility with Process Materials/Reagents.

5.2.3 Compatibility with Impurities.

5.2.4 Compatibility with Heat Transfer Fluids.

5.2.5 Compatibility with Materials of Construction and Corrosion Products.

5.2.6 Compatibility with Insulation.

5.2.7 Compatibility with Fire-Extinguishing Agents.

5.2.8 Compatibility with Other Materials.

5.2.9 Other Compatibility-Related Practices.

5.3 Storage Time and Shelf Life.

5.3.1 Storage Time Limitations.

5.3.2 Practices for Increasing Shelf Life.

5.3.3 Handling and Disposal of Too-Old Material.

5.4 Storage Quantity and Configuration.

5.4.1 Determining Maximum Inventory.

5.4.2 Storage Configurations.

5.4.3 Top versus Bottom Discharge.

5.4.4 Facility Siting.

5.4.5 Restrictions on Container Shape or Configuration.

5.4.6 Mixing and Recirculation.

5.5 Air and Moisture Exclusion.

5.5.1 Air Exclusion Practices.

5.5.2 Moisture Exclusion Practices.

5.6 Monitoring and Control.

5.6.1 Oxygen Concentration Monitoring.

5.6.2 Humidity/Moisture Content Monitoring.

5.6.3 Pressure Monitoring.

5.6.4 Temperature Monitoring.

5.6.5 Temperature Control.

5.7 Handling and Transfer.

5.7.2 Piping Specifications and Layout.

5.7.3 Fittings and Connections.

5.7.4 Pumps and Pump Seals.

5.7.5 Valves.

5.7.6 Drain Systems.

5.7.7 Cleaning Equipment.

5.7.8 Transfer Systems Operating and Maintenance Practices.

5.8 Last-Resort Safety Features.

5.8.1 Inhibitor Injection.

5.8.2 Quench System.

5.8.3 Dump System.

5.8.4 Depressuring System.

5.8.5 Emergency Relief Configuration.

5.8.6 Emergency Relief Sizing Basis.

5.8.7 Emergency Relief Headers.

5.8.8 Emergency Relief Treatment Systems.

5.8.9 Explosion Suppression.

5.9 Passive Mitigation.

5.9.1 Flow-Limiting Orifices.

5.9.2 Fire-Resistant/Explosion-Resistant Construction.

5.9.3 Weak Seams and Explosion Venting.

5.9.4 Bunkers, Blast Walls and Barricades.

5.9.5 Secondary Containment.

5.9.6 Separation Distances.

5.10 Detections, Warning and Isolation.

5.10.1 Release Detection.

5.10.2 Release Warning.

5.10.3 Release Isolation.

5.11 Fire Prevention and Protection.

5.11.1 Ignition Source Control.

5.11.2 Fireproofing and Insulation.

5.11.3 Extinguishing Systems.

5.12 Postrelease Mitigation.

5.12.1 Reactive Release Countermeasures.

5.12.2 Reactive Chemicals Personal Protective Equipment.

5.12.3 Reactive Chemicals Emergency Response.

5.13 Hazard Reviews.

5.13.1 Hazard Severity Categories.

5.13.2 Reactive Chemicals Hazard Reviews.

5.14 Codes and Standards.


6. Process Safety Management of Reactive Material Facilities.

6.1 Accountability: Objective and Goals.

6.2 Process Knowledge and Documentation.

6.3 Capital Project Review and Design Procedures.

6.4 Process Risk Management.

6.5 Management of Change.

6.6 Process and Equipment Integrity.

6.7 Human Factors.

6.8 Personnel Training and Performance.

6.9 Incident Investigation.

6.10 Standards, Codes, and Regulations.

6.11 Audits and Corrective Actions.

6.12 Enhancement of Process Safety Knowledge.

6.13 Other Elements Required by Regulatory Authorities.



7. Specific Design Considerations.

7.1 Polymerizable Materials: Acrylic Acid.

7.2 Polymerizable Materials: Styrene.

7.3 Organic Peroxides.

7.4 Organic Peroxides: Dibenzoyl Peroxide.

7.5 Organic Peroxides: MEK Peroxide.

7.6 Temperature-Sensitive Materials: Ethylene Oxide.

7.7 Pyrophoric Materials: Aluminum Alkyls.

7.8 Peroxide Formers: 1,3-Butadiene.

7.9 Water-Reactive Materials: Sodium.

7.10 Water-Reactive Materials: Chlorosulfonic Acid.


Appendix A. Reactive Chemicals Literature Sources.

Procedures for Hazard Evaluation and Testing.

Accident and Loss Prevention.

Data Sources and Compilations.

Material Safety Data Sheets.

Computerized On-line Databases.

Educational and Training Materials.

Appendix B. Industry Practice Survey Results.



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Author Information

The CENTER FOR CHEMICAL PROCESS SAFETY (CCPS), an industry technology alliance of the American Institute of Chemical Engineers (AIChE), has been a world leader in developing and disseminatinginformation on process safety management and technology since 1985. CCPS has published over 80 books in its process safety guidelines and process safety concepts series. For more information, visit www.ccpsonline.org.
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