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ASHRAE Guide for HVAC in Hazardous Spaces, 2021
- Dedication
- About the Author
- Contents
- Preface
- Acknowledgments
- 1 - Introduction [Go to Page]
- Definitions
- Additional Sources of Information
- 2 - Applicable Hazardous Substances [Go to Page]
- Toxic Substances
- Asphyxiating Substances
- Flammable and Combustible Substances
- Corrosive Substances
- Conclusion
- 3 - Sources of Hazards in Relationship to Protected Spaces [Go to Page]
- External Sources
- Internal Sources [Go to Page]
- Contained Sources
- Uncontained Sources
- Fugitive Emission Sources
- Horizontal Surface Sources
- Limited and Unlimited Releases
- Flow Modeling of Sources
- Combined Sources
- Synopsis
- 4 - Protection Methods [Go to Page]
- Ventilation [Go to Page]
- Positive Ventilation
- Negative Ventilation
- Potential Adverse Effects
- Ventilation Inlet and Outlet Locations
- Air Changes per Hour or Flow Rate
- Monitoring, Alarm, and Performance
- Natural Ventilation
- Emergency Ventilation
- Pressurization [Go to Page]
- Principles of Operation
- Monitoring, Alarm, and Performance Requirements
- Dilution [Go to Page]
- Principles of Operation
- Monitoring, Alarm, and Performance Requirements
- Filtration [Go to Page]
- Particulate Collection Air Filters
- Deep-Bed or Gas-Phase Chemical Scrubbers
- Electrostatic Precipitation Air Filters
- Cyclonic Air Filters
- Containment, Isolation, and Removal of Airborne Dusts and Particles
- 5 - Protected Space Integrity [Go to Page]
- General Construction Assessment
- Electrical Conduit Entry Assessment
- Piping, Ducting, and Plumbing System Drain and Vent Assessments
- Interior Construction Assessment [Go to Page]
- Vapor Barriers
- Isolated Area Assessment
- Design Considerations for Dust Hazards
- Design Considerations for Blast-Rated Spaces
- Design Considerations for Blast-Vented Spaces
- Synopsis
- 6 - Equipment Selection Criteria [Go to Page]
- Housings and Component Materials [Go to Page]
- Noncorrosive Conditions
- Corrosive Conditions
- Fan Blade and Blower Wheel Materials
- Protection System Equipment Electrical Ratings [Go to Page]
- Surrounding Atmosphere Classification
- Protected Space Classification
- Equipment Rating Establishment
- Air-Conditioning System Equipment Electrical Ratings
- Electric Heating Equipment Electrical Ratings
- Equipment Sizing, Redundancy, and Safety Factors
- 7 - Associated Equipment Design and Installation Requirements [Go to Page]
- Intake Duct and Stack Pipe Design and Installation
- Contaminant-Free Air Inlet and Exhaust Vent Design and Installation
- Room Pressure and Airflow Sensor and Switch Design and Installation
- Gas Detection System Design and Installation
- Alarm System Design and Installation
- Emergency Shutdown and Ventilation Switch Design and Installation
- 8 - System Maintenance [Go to Page]
- Establishment of Preventive Maintenance Procedures
- 9 - System Operation
- References [Go to Page]
