TABLE OF CONTENTS Board of Appeals General Limitations of Authority... 6 Table Mechanical Permit Fees...

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1 TABLE OF CONTENTS CHAPTER 1 ADMINISTRATION General Title Scope Purpose Unconstitutional Validity Applicability Conflicts Between Codes Existing Installations Maintenance Additions, Alterations, Renovations, or Repairs Health and Safety Changes in Building Occupancy Moved Structures Appendices Duties and Powers of the Authority Having Jurisdiction General Liability Applications and Permits Right of Entry Permits Permits Required Exempt Work Application for Permit Permit Issuance Fees Inspections and Testing General Required Inspections Testing of Systems Connection to Service Utilities Violations and Penalties General Notices of Correction or Violation Penalties Stop Orders Authority to Disconnect Utilities in Emergencies Authority to Condemn Board of Appeals General Limitations of Authority Table Mechanical Permit Fees CHAPTER 2 DEFINITIONS General Applicability Definition of Terms General CHAPTER 3 GENERAL REGULATIONS General Applicability Approval Design of Equipment Electrical Connections Oil-Burning Appliances Personnel Protection Materials Standards and Alternates Minimum Standards Alternate Materials and Methods of Construction Equivalency Alternative Engineered Design Installation Listed Appliances Closet or Alcove Installations Unlisted Appliances Anchorage of Appliances Movement Identification of Equipment Liquefied Petroleum Gas Facilities Appliances on Roofs Avoiding Strain on Gas Piping Clearances Installation in Commercial Garages Installation in Aircraft Hangars Pit Location xv

2 304.0 Accessibility for Service General Sloped Roof Access to Appliances on Roofs Appliances in Attics and Under-Floor Spaces Location Installation in Garages Flood Hazard Areas Elevator Shaft Drainage Pan Automatic Control Devices General Labeling Fuel-Burning Appliances Electric Heating Appliances Heat Pump and Electric Cooling Appliances Absorption Units Improper Location General Workmanship Engineering Practices Concealing Imperfections Installation Practices Condensate Wastes and Control Condensate Disposal Condensate Control Condensate Waste Pipe Material and Sizing Table Minimum Condensate Pipe Size Appliance Condensate Drains Point of Discharge Condensate Waste From Air-Conditioning Coils Plastic Fittings Heating or Cooling Air System Source Air Filters Prohibited Source Return-Air Limitations Plumbing Connections General Hangers and Supports General Material Suspended Piping Alignment Underground Installation Hanger Rod Sizes Table Hanger Rod Sizes Gas Piping Balancing General Louvers in Hurricane Prone Regions General Protection of Piping, Tubing, Materials, and Structures General Installation Corrosion, Erosion, and Mechanical Damage Protectively Coated Pipe Fire-Resistant Construction Steel Nail Plates Sleeves Firewalls Structural Members Rodentproofing Metal Collars Trenching, Excavation, and Backfill Trenches Tunneling and Driving Open Trenches Excavations Table Reduction of Clearances with Specified Forms of Protection Table Hangers and Supports CHAPTER 4 VENTILATION AIR General Applicability Ventilation Air Occupiable Spaces Natural Ventilation Mechanical Ventilation Outdoor Air Intake Protection Ventilation Rates xvi

3 403.1 General Zone Calculations Single-Zone Systems One Hundred Percent Outdoor Air Systems Multiple-Zone Recirculating Systems Design for Varying Operating Conditions Exhaust Ventilation Dynamic Reset Air Classification and Recirculation Multiple-Zone Systems General Average Outdoor Air Fraction Zone Ventilation Efficiency Table Minimum Ventilation Rates in Breathing Zone Table Zone Air Distribution Effectiveness Table System Ventilation Efficiency Table Minimum Exhaust Rates CHAPTER 5 EXHAUST SYSTEMS General Applicability Termination Exhaust Opening Protection Termination of Exhaust Ducts Part I Environmental Air Ducts and Product-Conveying Systems Motors, Fans, and Filters General Fans Environmental Air Ducts General Independent Exhaust Systems Domestic Range Clothes Dryers Heat (Energy) Recovery Ventilators Gypsum Wallboard Ducts Product-Conveying Systems General Incompatible Materials Flammability Limit Air Moving Devices Generating Flames, Sparks, or Hot Materials Fire Dampers Fire Detection and Alarm Systems Product-Conveying Ducts Classification Minimum Velocities and Circulation Table Minimum Duct Design Velocities Makeup Air Hoods and Enclosures Product-Conveying Ducts Materials Construction Penetrations Table 506.2(1) Minimum Sheet Metal Thickness for Round Ducts Condensate Fittings Explosion Venting Supports Fire Protection Table 506.2(2) Minimum Sheet Metal Thickness for Rectangular Ducts Protection from Physical Damage Duct Clearances Table Basic Minimum Clearances to Unprotected Surfaces Clearance Reduction Methods Table Reduction of Duct Clearance with Specified forms of Protection Part II Commercial Hoods and Kitchen Ventilation General Requirements Type I Hood Exhaust System Exhaust System Listed Devices Clearance Drawings Notification of Change Type I Hoods xvii

4 508.1 Where Required Listed Type I Hood Assemblies Construction of Type I Hoods Supports Hood Size Table Extra-Heavy-Duty Cooking Appliance Airflow Table Heavy-Duty Cooking Appliance Airflow Table Medium-Duty Cooking Appliance Airflow Table Light-Duty Cooking Appliance Airflow Solid-Fuel Hood Assemblies Exhaust Outlets Grease Removal Devices in Hoods Grease Removal Devices Installation Solid-Fuel Grease Removal Devices Exhaust Duct Systems General Clearance Openings Listed Grease Ducts Other Grease Ducts Exterior Installations Interior Installations Underground Installations Termination of Type I Hood Exhaust System Solid-Fuel Duct Systems Air Movement Exhaust Fans for Commercial Cooking Operations Airflow Makeup Air Common Duct (Manifold) Systems Solid-Fuel Air Movement Requirements Auxiliary Equipment Dampers Electrical Equipment Other Equipment Solid-Fuel Auxiliary Equipment Fire-Extinguishing Equipment General Types of Equipment Simultaneous Operation Fuel and Electric Power Shutoff Manual Activation System Annunciation System Supervision Special Design and Application Review and Certification Installation Requirements Portable Fire Extinguishers Maintenance Solid-Fuel Fire-Extinguishing Equipment Procedures for the Use, Inspection, Testing, and Maintenance of Equipment Operating Procedures Inspection, Testing and Maintenance Inspection for Grease Buildup Table Schedule of Inspection for Grease Buildup Cleaning of Exhaust Systems Cooking Equipment Maintenance Minimum Safety Requirements for Cooking Equipment Cooking Equipment Operating Controls Recirculating Systems General Requirements Design Restrictions Interlocks Location and Application Restrictions Additional Fire Safety Requirements Use and Maintenance Solid-Fuel Cooking Operations Venting Application Location of Appliances xviii

5 517.3 Hoods for Solid-Fuel Cooking Exhaust Systems for Solid-Fuel Cooking Grease Removal Devices for Solid-Fuel Cooking Air Movement for Solid-Fuel Cooking Fire-Extinguishing Equipment for Solid-Fuel Cooking Other Safety Requirements Downdraft Appliances General Ventilation System Fire-Extinguishing Equipment Airflow Switch or Transducer Surface Materials Type II Hood Exhaust System Requirements Where Required Construction of Type II Hoods Dishwashing Appliances Type II Exhaust Duct Systems Termination of Type II Hood Exhaust System Makeup Air CHAPTER 6 DUCT SYSTEMS General Applicability Sizing Requirements Material General Combustibles Within Ducts or Plenums Metal Phenolic Gypsum Factory-Made Air Ducts Vibration Isolators Corridors Installation of Ducts General Under Floor or Crawl Space Metal Ducts Factory-Made Air Ducts Flexible Air Ducts Plastic Ducts Protection of Ducts Support of Ducts Protection Against Flood Damage Joints and Seams of Ducts Table Closure Markings Cross Contamination Underground Installation Air Dispersion Systems Insulation of Ducts General Smoke Dampers, Fire Dampers, and Ceiling Dampers Smoke Dampers Fire Dampers Ceiling Radiation Dampers Multiple Arrangements Access and Identification Freedom from Interference Temperature Classification of Operating Elements Ventilating Ceilings General Requirements Use of Under-Floor Space as Supply Plenum for Dwelling Units General Dwelling Units Enclosed Flammable Materials Access Automatic Control Temperature Limit Noncombustible Receptacle Floor Registers Exterior Wall and Interior Stud Partitions Wall Register Distance from Combustible Vapor Barrier Prohibited Automatic Shutoffs Air-Moving Systems and Smoke Detectors xix

6 CHAPTER 7 COMBUSTION AIR General Applicability Pressure Difference Makeup Air Indoor Combustion Air Indoor Opening Size and Location Outdoor Combustion Air Combination Indoor and Outdoor Combustion Air Engineered Installations Mechanical Combustion Air Supply Louvers, Grilles, and Screens Combustion Air Ducts Dampers Prohibited Extra Device or Attachment General CHAPTER 8 CHIMNEYS AND VENTS General Applicability Venting of Gas Appliances Appliances Fueled by Other Fuels Venting of Appliances Listing Connection to Venting Systems Design and Construction Type of Venting System to be Used Masonry, Metal, and Factory-Built Chimneys Table Type of Venting System to be Used Gas Vents Table Roof Pitch Height Single-Wall Metal Pipe Table Clearance for Connectors Through-the-Wall Vent Termination Condensation Drain Vent Connectors for Category I Appliances Table Minimum Thickness for Galvanized Steel Vent Connectors for Low- Heat Appliances Table Minimum Thickness for Steel Vent Connectors for Medium-Heat Appliances Vent Connectors for Category II, Category III, and Category IV Appliances Draft Hoods and Draft Controls Manually Operated Dampers Obstructions Automatically Operated Vent Dampers Sizing of Category I Venting Systems Single Appliance Vent Table (1) through Table (6) Multiple Appliance Vent Table 803.2(1) through Table 803.2(9) Table Vent Connector Maximum Length Table (1) Type B Double-Wall Gas Vent Table (2) Type B Double-Wall Gas Vent Table (3) Masonry Chimney Table (4) Masonry Chimney Table (5) Single-Wall Metal Pipe or Type B Asbestos-Cement Vent Table (6) Exterior Masonry Chimney Table 803.2(1) Type B Double-Wall Vent Table 803.2(2) Type B Double-Wall Vent Table 803.2(3) Masonry Chimney Table 803.2(4) Masonry Chimney Table 803.2(5) Single-Wall Metal Pipe or Type B Asbestos Cement Vent Table 803.2(6) Exterior Masonry Chimney Table 803.2(7) Exterior Masonry Chimney Table 803.2(8) Exterior Masonry Chimney Table 803.2(9) Exterior Masonry Chimney xx

7 CHAPTER 9 INSTALLATION OF SPECIFIC APPLIANCES General Applicability General Nonindustrial Appliance Combustion Air from Bedroom or Bathroom Added or Converted Appliances Type of Gas(es) Safety Shutoff Devices for Unlisted LP-Gas Appliance Used Indoors Fuel Input Rate Use of Air or Oxygen Under Pressure Building Structural Members Flammable Vapors Solid-Fuel Burning Appliances Combination of Appliances and Equipment Protection of Gas Appliances from Fumes or Gases other than Products of Combustion Process Air Gas Appliance Pressure Regulators Venting of Gas Appliance Pressure Regulators Bleed Lines for Diaphragm-Type Valves Air-Conditioning Appliances Electric Air Conditioners Gas-Fired Air Conditioners and Heat Pumps Central Heating Boilers and Furnaces Location Clearance Table Clearances to Combustible Material for Unlisted Furnaces and Boilers Assembly and Installation Temperature- or Pressure-Limiting Devices Low-Water Cutoff Steam Safety and Pressure-Relief Valves Furnace Plenums and Air Ducts Refrigeration Coils Cooling Units Used with Heating Boilers Furnace (Upright and Horizontal) Solid-Fuel-Fired Furnaces Oil-Fired Central Furnaces Commercial or Industrial Gas Heaters Electric Central Furnaces Duct Furnaces Clearances Installation of Duct Furnaces Access Panels Location of Draft Hoods and Controls Circulating Air Duct Furnaces Used with Refrigeration Systems Installation in Commercial Garages and Aircraft Hangars Electric Duct Heaters Floor Furnaces Installation Temperature Limit Controls Combustion and Circulating Air Placement Bracing Support Clearance Access Seepage Pan Wind Protection Upper-Floor Installations First Floor Installation Oil-Fired Floor Furnaces Wall Furnaces Installation Location Combustion and Circulating Air Oil-Fired Wall Furnaces Clothes Dryers xxi

8 908.1 Electric Clothes Dryers Gas-Fired Clothes Dryers Conversion Burners General Burner Assemblies Oil Burners Gas Burners Decorative Appliances for Installation in Vented Fireplaces Prohibited Installations Installation Fireplace Screens Gas Fireplaces, Vented Prohibited Installations Installation Table Free Opening Area of Chimney Damper for Venting Flue Gases from Unlisted Decorative Appliances for Installation in Vented Fireplaces Combustion and Circulating Air Factory-Built Fireplaces and Fireplace Stoves Factory-Built Fireplaces Fireplace Stoves Fireplace Accessories Non-Recirculating Direct Gas-Fired Industrial Air Heaters Application Prohibited Installations Installation Clearance from Combustible Materials Air Supply Atmospheric Vents, Gas Reliefs, or Bleeds Relief Openings Purging Recirculating Direct Gas-Fired Industrial Air Heaters Application Prohibited Installations Installation Clearance from Combustible Materials Air Supply Atmospheric Vents, Gas Reliefs, or Bleeds Relief Openings Purging Room Heaters Electric Room Heaters Gas-Fired Room Heaters Solid-Fuel-Type Room Heaters Unit Heaters Support Clearance Combustion and Circulating Air Ductwork Installation in Commercial Garages and Aircraft Hangars Oil-Fired Unit Heaters Food Service Appliance, Floor Mounted Clearance for Listed Appliances Clearance for Unlisted Appliances Mounting on Combustible Floors Installation on Noncombustible Floors Combustible Material Adjacent to Cooking Top Use with Casters Level Installation Ventilation Food Service Appliances, Counter Appliances Vertical Clearance Clearance for Listed Appliances Clearance for Unlisted Appliances Mounting of Unlisted Appliances Household Cooking Appliances Electric Household Cooking Appliances Gas-Fired Household Cooking Appliances Floor-Mounted Units Built-In Units xxii

9 921.0 Cooking Appliances Listing Commercial Electric Ranges Commercial Wood-Fired Baking Ovens Oil-Burning Ranges Open-Top Broiler Units Listed Units Unlisted Units Protection Above Domestic Units Commercial Units Outdoor Cooking Appliances Listed Units Unlisted Units Illuminating Appliances Clearances for Listed Appliances Clearances for Unlisted Appliances Table Clearances for Unlisted Outdoor Open-Flame Illuminating Appliances Mounting on Buildings Mounting on Posts Appliance Pressure Regulators Incinerators and Crematories Field Constructed Commercial-Industrial Incinerators Factory-Built Commercial Crematories Residential Incinerators Infrared Heaters Support Clearance Combustion and Ventilation Air Installation in Commercial Garages and Aircraft Hangars Pool Heaters Location Clearance Temperature or Pressure- Limiting Devices Bypass Valves Venting Refrigerators Clearance Venting or Ventilating Kits Approved for Use With a Refrigerator Gas-Fired Toilets Clearance Installation on Combustible Floors Vents Appliances for Installation in Manufactured Housing General Small Ceramic Kilns General Installation Fuel-Gas Controls Electrical Equipment Installations Inside Buildings Exterior Installations Outdoor Open Flame Decorative Appliances General Evaporative Cooling Systems General Location Access, Inspection, and Repair Installation Refrigeration Appliances Self-Contained Refrigerators and Freezers Unit Coolers Self-Contained Mechanical Refrigeration Systems Ductless Mini-Split Systems Installation General Air Filter Appliances Electrostatic Air Cleaners High-Efficiency Particulate Air Filter Units Gaseous Hydrogen Systems General Compressed Natural Gas (CNG) Vehicular Fuel Systems General xxiii

10 CHAPTER 10 BOILERS AND PRESSURE VESSELS General Applicability Boiler Rooms and Enclosures Air for Combustion and Ventilation Drainage Mounting Chimneys or Vents Standards General Oil-Burning Boilers Electric Boilers Solid-Fuel-Fired Boilers Dual Purpose Water Heater Detailed Requirements Safety Requirements Controls Gauges Stack Dampers Welding Expansion Tanks General Open-Type Expansion Tanks Closed-Type Systems Minimum Capacity of Closed- Type Tank Table (1) Expansion Tank Capacities for Gravity Hot Water Systems Table (2) Expansion Tank Capacities for Forced Hot Water Systems Safety or Relief Valve Discharge General Discharge Piping Splash Shield Hazardous Discharge Vacuum Relief Valve Shutoff Valves General Gas-Pressure Regulators General Low-Water Cutoff General Combustion Regulators - Safety Valves General Clearance for Access General Power Boilers Steam-Heating Boilers, Hot Water Boilers, and Power Boilers Package Boilers, Steam-Heating Boilers, and Hot-Water-Heating Boilers Boilers, Stokers, and Steam Generators General Operating Adjustments and Instructions General Inspections and Tests General Operating Permit Maintenance Inspection Power and Miniature Boilers Steam-Heating and Water- Heating Boilers Automatic Steam-Heating Boilers Unfired Pressure Vessels Operation and Maintenance of Boilers and Pressure Vessels General Table Controls and Limit Devices for Automatic Boilers CHAPTER 11 REFRIGERATION General Applicability Equipment Part I Refrigeration Systems Refrigeration Systems General Ammonia Refrigeration Systems Refrigerants Classification Classification of Refrigerants Classification of Refrigeration Systems Higher Flammability Refrigerants xxiv

11 Requirements for Refrigerant and Refrigeration System Use System Selection Refrigerant Concentration Limit Institutional Occupancies Industrial Occupancies and Refrigerated Rooms Flammable Refrigerants Applications for Human Comfort and for Nonindustrial Occupancies Refrigerant Type and Purity Changing Refrigerants General Requirements Human Comfort Supports and Anchorage Access Illumination and Service Receptacles Ventilation of Rooms Containing Condensing Units Prohibited Locations Condensate Defrost Overflows Condensate, Defrost, and Overflow Disposal Refrigerant Port Protection Storage Refrigeration Machinery Rooms Where Required Refrigeration Machinery Room, General Requirements Table Required Airflow for Group A2L Refrigerants Normal Operation Natural Ventilation Combustion Air Airflow Ventilation Intake Maximum Temperature Refrigerant Parts in Air Duct Dimensions Restricted Access Exits Machinery Room, Special Requirements General Refrigeration Machinery Room Equipment and Controls General Electrical Emergency Shut-off Installation, Maintenance, and Testing Emergency Pressure Control System Refrigeration Piping, Containers, and Valves Materials Joints Penetration of Piping Location of Refrigeration Piping Underground Piping Support Pipe Enclosure Visual Inspection Condensation Identification Valves More than 6.6 Pounds of Refrigerant More than 110 Pounds of Refrigerant Support Access Identification Pressure-Limiting Devices Where Required Setting Location Emergency Stop Pressure-Relief Devices General Positive Displacement Compressor Liquid-Containing Portions of Systems Evaporators Hydrostatic Expansion Actuation Stop Valves Prohibited Location Materials Pressure-Relief Device Settings xxv

12 Discharge from Pressure-Relief Devices Discharge Piping Table Atmospheric Pressure at Nominal Installation Elevation Rating of Pressure- Relief Device Rating of Rupture Members and Fusible Plugs Overpressure Protection General Type of Protection Discharging Into Lowside of System Parallel Pressure-Relief Devices Discharge Capacity Table Relief Devices Capacity Factor Three-Way Valve Special Discharge Requirements General Design Requirements Testing Labeling and Identification General Volume and Type Permanent Sign Marking of Pressure- Relief Devices Testing of Refrigeration Equipment Factory Tests Field Tests Table Field Leak Test Pressures Test Gases Declaration Brine Systems Refrigerant-Containing Pressure Vessels Inside Dimensions 6 inches or Less Inside Dimensions More than 6 inches Pressure Vessels for 15 psig or Less Maintenance and Operation General Part II Cooling Towers General Applicability Support and Anchorage General Drainage General Chemical Treatment Systems General Automated Control of Cycles of Concentration Location General Electrical General Refrigerants and Hazardous Fluids General Drift Eliminators General Table Refrigerant Groups, Properties, and Allowable Quantities Table Permissible Refrigeration Systems CHAPTER 12 HYDRONICS General Applicability Insulation Water Hammer Terminal Units Return-Water Low- Temperature Protection Protection of Potable Water Supply Prohibited Sources Chemical Injection Compatibility Capacity of Heat Source Heat Source Dual Purpose Water Heater Table Water Heaters Tankless Water Hater Identification of a Potable and Nonpotable Water System General xxvi

13 Color and Information Potable Water Nonpotable Water Table Minimum Length of Color Field and Size of Letters Location of Piping Identification Flow Directions Installation, Testing, and Inspection Operating Instructions Pressure Testing Flushing Pressure and Safety Devices General Discharge Piping Heating Appliances and Equipment General Boilers Dual-Purpose Water Heaters Solar Heat Collector Systems Circulators and Pumps General Mounting Sizing Expansion Tanks General Installation Open-Type Expansion Tanks Closed-Type Tanks Sizing Materials Piping, Tubing, and Fittings Expansion and Contraction Hangers and Supports Oxygen Diffusion Corrosion Joints and Connections General Chlorinated Polyvinyl Chloride (CPVC) Pipe Table Materials for Hydronic System Piping, Tubing, and Fittings CPV/AL/CPVC Plastic Pipe and Joints Copper or Copper Alloy Pipe and Tubing Crossed-Linked Polyethylene (PEX) Pipe Cross-Linked Polyethylene/ Aluminum/Cross-Linked Polyethylene (PEX-AL-PEX) Pipe Ductile Iron Pipe Polyethylene (PE) Plastic Pipe/Tubing Polyethylene/Aluminum/ Polyethylene (PE-AL-PE) Polyethylene of Raised Temperature (PE-RT) Polypropylene (PP) Pipe Polyvinyl Chloride (PVC) Pipe Steel Pipe and Tubing Joints Between Various Materials Valves General Where Required Heat Exchanger Pressure Vessels Pressure Reducing Valves Equipment, Components, and Appliances Expansion Tank Flow Balancing Valves Mixing or Temperature Control Valves Thermosiphoning Air Removal Device or Air Vents System Controls Water Temperature Controls Operating Steam Controls Occupied Spaces Pressure and Flow Controls Balancing Low-Water Control Flow-Sensing Devices Automatic Makeup Fluid Differential Pressure Regulation Air-Removal Device Air-Separation Device xxvii

14 Secondary Loops Hydronic Space Heating General Installation Freeze Protection Balancing Heat Transfer Fluid Steam Systems Steam Traps Sloping for Two-Pipe System Sloping for One-Pipe System Automatic Air Vents Condensate Flow Steam-Distribution Piping Radiant Heating and Cooling Installation Radiant Under-Floor Heating Radiant Cooling Systems Tube Placement Table Maximum Length of Continuous Tubing from a Supply-and-Return Manifold Arrangement Poured Floor Structural Concrete Slab Systems (Thermal Mass) Radiant Heating and Cooling Panels Heat Exchangers General Indirect-Fired Domestic Hot-Water Storage Tanks General Auxiliary Systems Use of Chemical Additives and Corrosive Fluids Snow and Ice Melt Controls Table Loop Lengths for Snow and Ice Melt Systems Hydronic Makeup Air Units Piping Installation General Embedded Piping Materials and Joints Pressure Testing System Drainage Condensate Drainage Clearance to Combustibles CHAPTER 13 FUEL GAS PIPING Scope of Gas Piping Applicability Coverage of Piping System General Piping System Requirements Applications Inspection Inspection Notification Excavation Type of Inspections Inspection Waived Certificate of Inspection Issuance Gas Supplier Unlawful Authority to Render Gas Service Authorized Personnel Outlets Authority to Disconnect Disconnection Notice Capped Outlets Temporary Use of Gas General Gas Piping System Design, Materials, and Components Installation of Piping System Provision for Location of Point of Delivery Interconnections Between Gas Piping Systems Sizing of Gas Piping Systems Acceptable Piping Materials and Joining Methods Table Approximate Gas Input for Typical Appliances Table Specifications for Threading Metallic Pipe Gas Meters Gas Pressure Regulators Overpressure Protection xxviii

15 Pressure Limitation Requirements Backpressure Protection Low-Pressure Protection Shutoff Valves Expansion and Flexibility Excess Flow Valve General Gas Piping Installation Piping Underground Installation of Piping Table Support of Piping Concealed Piping in Buildings Piping in Vertical Chases Maximum Design Operating Pressure Appliance Overpressure Protection Gas Pipe Turns Drips and Sediment Traps Outlets Branch Pipe Connection Manual Gas Shutoff Valves Prohibited Devices Systems Containing Gas-Air Mixtures Outside the Flammable Range Systems Containing Flammable Gas-Air Mixtures Electrical Bonding and Grounding Pipe and Tubing other than CSST Bonding of CSST Gas Piping Grounding Conductor of Electrode Lightning Protection System Electrical Circuits Electrical Connections Appliance Connections to Building Piping Connecting Appliances and Equipment Suspended Low-Intensity Infrared Tube Heaters Use of Gas Hose Connectors Injection (Bunsen) Burners Connection of Portable and Mobile Industrial Appliances Appliance Shutoff Valves and Connections Quick-Disconnect Devices Gas Convenience Outlets Sediment Trap Installation of Piping Liquefied Petroleum Gas Facilities and Piping Pressure Testing and Inspection Piping Installations Test Preparation Test Pressure Detection of Leaks and Defects Piping System Leak Test Purging Requirements Table Size and Length of Piping Required Gas Supply General Volume Gas Appliances Size of Piping Outlets Required Gas Piping Size Pipe Sizing Methods Tables for Sizing Gas Piping Systems Sizing Equations Table Cr and Y for Natural Gas and Undiluted Propane at Standard Conditions Sizing of Piping Sections Engineering Methods Variable Gas Pressures Table (1) Schedule 40 Metallic Pipe Table (2) Schedule 40 Metallic Pipe Table (3) Schedule 40 Metallic Pipe Table (4) Schedule 40 Metallic Pipe Table (5) Schedule 40 Metallic Pipe Table (6) Schedule 40 Metallic Pipe Table (7) Semi-Rigid Copper Tubing Table (8) Semi-Rigid Copper Tubing Table (9) Semi-Rigid Copper Tubing Table (10) Semi-Rigid Copper Tubing Table (11) Semi-Rigid Copper Tubing Table (12) Semi-Rigid Copper Tubing Table (13) Semi-Rigid Copper Tubing Table (14) Corrugated Stainless Steel Tubing (CSST) Table (15) Corrugated Stainless Steel Tubing (CSST) xxix