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eLibrary > ASHRAE Guide for HVAC in Hazardous Spaces >

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]

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