609.2 Air-Moving Systems and

Smoke Detectors in Group I-2 Occupancies . . . . . . . . . . . . . . . . 144

CHAPTER 7 COMBUSTION AIR . . . . . . . . . . . 145

701.0 General. . . . . . . . . . . . . . . . . . . . . 147

701.1 Applicability. . . . . . . . . . . . . . . . . . 147

701.2 Pressure Difference . . . . . . . . . . . 147

701.3 Makeup Air . . . . . . . . . . . . . . . . . . 147

701.4 Indoor Combustion Air . . . . . . . . . 147

701.5 Indoor Opening Size and Location . . . . . . . . . . . . . . . . . . . . 147

701.6 Outdoor Combustion Air . . . . . . . . 147

701.7 Combination Indoor and Outdoor

Combustion Air . . . . . . . . . . . . . . . 148

701.8 Engineered Installations . . . . . . . . 149

701.9 Mechanical Combustion Air

Supply. . . . . . . . . . . . . . . . . . . . . . 149

701.10 Louvers, Grilles, and Screens . . . 149

701.11 Combustion Air Ducts. . . . . . . . . . 150

701.12 Dampers Prohibited . . . . . . . . . . . 150

702.0 Extra Device or Attachment . . . . . 150

702.1 General. . . . . . . . . . . . . . . . . . . . . 150

CHAPTER 8 CHIMNEYS AND VENTS. . . . . . . 151

801.0 General. . . . . . . . . . . . . . . . . . . . . 153

801.1 Applicability. . . . . . . . . . . . . . . . . . 153

801.2 Venting of Gas Appliances . . . . . . 153

801.3 Appliances Fueled by Other Fuels. 153

802.0 Venting of Appliances. . . . . . . . . . 153

802.1 Listing . . . . . . . . . . . . . . . . . . . . . . 153

802.2 Connection to Venting Systems . . 153

802.3 Minimum Safe Performance . . . . . 153

802.4 Type of Venting System to be Used . . . . . . . . . . . . . . . . . . . . . . . 154

802.5 Masonry, Metal, and Factory-Built Chimneys . . . . . . . . . . . . . . . . . . . 154

Table 802.4 Type of Venting System to be Used . . . . . . . . . . . . . . . . . . . . . . . 155

802.6 Gas Vents. . . . . . . . . . . . . . . . . . . 157

Table 802.6.1 Roof Slope Heights. . . . . . . . . . . . 158

802.7 Single-Wall Metal Pipe . . . . . . . . . 159

Table 802.7.3.3 Clearance for Connectors. . . . . . . 160

802.8 Through-the-Wall Vent Termination . . . . . . . . . . . . . . . . . . 160

802.9 Condensation Drain . . . . . . . . . . . 160

802.10 Vent Connectors for Category I Appliances . . . . . . . . . . . . . . . . . . 160

Table 802.10.1.3 Minimum Thickness for Galvanized

Steel Vent Connectors for Low Heat Appliances . . . . . . . . . . . . . . 161

Table 802.10.1.4 Minimum Thickness for Steel

Vent Connectors for Medium Heat Appliances . . . . . . . . . . . . . . 161

Table 802.8.1 Through-the-Wall Direct Vent Termination Clearances . . . . . . . . 162

802.11 Vent Connectors for Category II, Category III, and Category IV Appliances . . . . . . . . . . . . . . . . . . 164

802.12 Appliances Requiring Draft Hoods . . . . . . . . . . . . . . . . . . 164

802.13 Manually Operated Dampers . . . . 165

802.14 Automatically Operated Vent Dampers . . . . . . . . . . . . . . . . . . . . 165

802.15 Obstruction of Flow. . . . . . . . . . . . 165

803.0 Sizing of Category I Venting Systems . . . . . . . . . . . . . . . . . . . . 165

803.1 Additional Requirements to Single Appliance Vent . . . . . . . . . 165

803.2 Additional Requirements to Multiple-Appliance Vent.. . . . . . . . 167

Table 803.2.1 Vent Connector Maximum

Length. . . . . . . . . . . . . . . . . . . . . . 167

Table 803.1.2(1) Type B Double-Wall Gas Vent . . . 172

Table 803.1.2(2) Type B Double-Wall Gas Vent . . . 175

Table 803.1.2(3) Masonry Chimney. . . . . . . . . . . . . 177

Table 803.1.2(4) Masonry Chimney. . . . . . . . . . . . . 179

Table 803.1.2(5) Single-Wall Metal Pipe or Type B Asbestos-Cement Vent. . . . . . . . . 181

Table 803.1.2(6) Exterior Masonry Chimney . . . . . . 182

TABLE OF CONTENTS

Table 803.2(1) Type B Double-Wall Vent . . . . . . 183

Table 803.2(2) Type B Double-Wall Vent . . . . . . . 187

Table 803.2(3) Masonry Chimney. . . . . . . . . . . . . 189

Table 803.2(4) Masonry Chimney. . . . . . . . . . . . . 191

Table 803.2(5) Single-Wall Metal Pipe or Type B Asbestos-Cement Vent . . . 193

Table 803.2(6) Exterior Masonry Chimney . . . . . . 193

Table 803.2(7) Exterior Masonry Chimney . . . . . . 194

Table 803.2(8) Exterior Masonry Chimney . . . . . . 195

Table 803.2(9) Exterior Masonry Chimney . . . . . . 196

CHAPTER 9 INSTALLATION OF

SPECIFIC APPLIANCES. . . . . . . 197

901.0 General. . . . . . . . . . . . . . . . . . . . . 199

901.1 Applicability. . . . . . . . . . . . . . . . . . 199

902.0 General. . . . . . . . . . . . . . . . . . . . . 199

902.1 Nonindustrial Appliances . . . . . . . 199

902.2 Combustion Air from Bedroom

or Bathroom . . . . . . . . . . . . . . . . . 199

902.3 Added or Converted Appliances. . 199

902.4 Type of Gas(es) . . . . . . . . . . . . . . 199

902.5 Safety Shutoff Devices for Unlisted LP-Gas Appliances Used Indoors . . . . . . . . . . . . . . . . 199

902.6 Fuel Input Rate . . . . . . . . . . . . . . . 199

902.7 Use of Air or Oxygen Under Pressure . . . . . . . . . . . . . . . . . . . . 199

902.8 Appliance Support . . . . . . . . . . . . 199

902.9 Flammable Vapors . . . . . . . . . . . . 199

902.10 Solid-Fuel-Burning Appliances . . . 199

902.11 Combination of Appliances and Equipment . . . . . . . . . . . . . . . 199

902.12 Protection of Gas Appliances from Fumes or Gases Other

than Products of Combustion . . . . 199

902.13 Process Air . . . . . . . . . . . . . . . . . . 200

902.14 Gas Appliance Pressure Regulators . . . . . . . . . . . . . . . . . . 200

902.15 Bleed Lines for Diaphragm-Type Valves. . . . . . . . . . . . . . . . . . . . . . 200

903.0 Air-Conditioning Appliances . . . . . 200

903.1 Electric Air Conditioners . . . . . . . . 200

903.2 Gas-Fired Air Conditioners

and Heat Pumps. . . . . . . . . . . . . . 200

903.3 Packaged Terminal Air Conditioners . . . . . . . . . . . . . . . . . 200

904.0 Central Heating Boilers and Furnaces. . . . . . . . . . . . . . . . . . . . 200

904.1 Application . . . . . . . . . . . . . . . . . . 200

904.2 Location . . . . . . . . . . . . . . . . . . . . 201

904.3 Clearance . . . . . . . . . . . . . . . . . . . 201

904.4 Assembly and Installation. . . . . . . 201

904.5 Temperature or Pressure Limiting Devices . . . . . . . . . . . . . . 202

904.6 Low-Water Cutoff . . . . . . . . . . . . . 202

904.7 Steam Safety and Pressure Relief Valves. . . . . . . . . . . . . . . . . 202

904.8 Refrigeration Coils . . . . . . . . . . . . 202

904.9 Cooling Units Used with Heating Boilers. . . . . . . . . . . . . . . . . . . . . . 202

904.10 Furnace (Upright and Horizontal) . . 202

Table 904.3.2 Clearances to Combustible

Material for Unlisted Furnaces

and Boilers . . . . . . . . . . . . . . . . . . 202

904.11 Solid-Fuel-Fired Furnaces . . . . . . 203

904.12 Oil-Fired Central Furnaces . . . . . . 203

904.13 Commercial or Industrial

Gas Heaters . . . . . . . . . . . . . . . . . 203

904.14 Electric Central Furnaces . . . . . . . 203

905.0 Duct Furnaces . . . . . . . . . . . . . . . 203

905.1 Application . . . . . . . . . . . . . . . . . . 203

905.2 Clearances . . . . . . . . . . . . . . . . . . 203

905.3 Installation of Duct Furnaces. . . . . 203

905.4 Access Panels . . . . . . . . . . . . . . . 203

905.5 Location of Draft Hoods

and Controls . . . . . . . . . . . . . . . . . 203

905.6 Circulating Air . . . . . . . . . . . . . . . . 203

905.7 Duct Furnaces Used with

Refrigeration Systems . . . . . . . . . 203

905.8 Installation in Commercial

Garages and Aircraft Hangars . . . 203

905.9 Electric Duct Heaters . . . . . . . . . . 203

906.0 Floor Furnaces . . . . . . . . . . . . . . . 203

906.1 Application . . . . . . . . . . . . . . . . . . 203

906.2 Installation . . . . . . . . . . . . . . . . . . 204

906.3 Temperature Limit Controls . . . . . 204

906.4 Combustion and Circulating Air. . . 204

906.5 Placement. . . . . . . . . . . . . . . . . . . 204

906.6 Bracing . . . . . . . . . . . . . . . . . . . . . 204

906.7 Support . . . . . . . . . . . . . . . . . . . . . 204

906.8 Clearance . . . . . . . . . . . . . . . . . . . 204

906.9 Access . . . . . . . . . . . . . . . . . . . . . 204

906.10 Seepage Pan . . . . . . . . . . . . . . . . 204

906.11 Wind Protection . . . . . . . . . . . . . . 204

906.12 Upper Floor Installations. . . . . . . . 204

906.13 First Floor Installation . . . . . . . . . . 204

906.14 Oil-Fired Floor Furnaces. . . . . . . . 204

TABLE OF CONTENTS

907.0 Wall Furnaces. . . . . . . . . . . . . . . . 204

907.1 Application . . . . . . . . . . . . . . . . . . 204

907.2 Installation . . . . . . . . . . . . . . . . . . 204

907.3 Location . . . . . . . . . . . . . . . . . . . . 205

907.4 Combustion and Circulating Air . . 205

907.5 Oil-Fired Wall Furnaces . . . . . . . . 205

908.0 Clothes Dryers . . . . . . . . . . . . . . . 205

908.1 Application . . . . . . . . . . . . . . . . . . 205

908.2 Electric Clothes Dryers . . . . . . . . . 205

908.3 Gas-Fired Clothes Dryers. . . . . . . 205

909.0 Conversion Burners . . . . . . . . . . . 205

909.1 General. . . . . . . . . . . . . . . . . . . . . 205

910.0 Burner Assemblies . . . . . . . . . . . . 206

910.1 Oil Burners . . . . . . . . . . . . . . . . . . 206

910.2 Gas Burners . . . . . . . . . . . . . . . . . 206

911.0 Decorative Appliances for Installation in Vented Fireplaces. . . 206

911.1 Application . . . . . . . . . . . . . . . . . . 206

911.2 Prohibited Installations . . . . . . . . . 206

911.3 Installation . . . . . . . . . . . . . . . . . . 206

911.4 Fireplace Screens. . . . . . . . . . . . . 206

912.0 Gas Fireplaces, Vented . . . . . . . . 206

912.1 Application . . . . . . . . . . . . . . . . . . 206

912.2 Reserved . . . . . . . . . . . . . . . . . . . 206

912.3 Installation . . . . . . . . . . . . . . . . . . 206

912.4 Combustion and Circulating Air . . . 206

913.0 Factory-Built Fireplaces and Fireplace Stoves. . . . . . . . . . . . . . 206

913.1 Factory-Built Fireplaces . . . . . . . . 206

913.2 Fireplace Stoves. . . . . . . . . . . . . . 206

913.3 Fireplace Accessories . . . . . . . . . 206

914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters. . . 206

914.1 Application . . . . . . . . . . . . . . . . . . 206

914.2 Prohibited Installations . . . . . . . . . 206

914.3 Installation . . . . . . . . . . . . . . . . . . 206

914.4 Clearance from Combustible

Materials . . . . . . . . . . . . . . . . . . . . 207

914.5 Air Supply . . . . . . . . . . . . . . . . . . . 207

914.6 Atmospheric Vents, Gas Reliefs, or Bleeds . . . . . . . . . . . . . 207

914.7 Relief Openings . . . . . . . . . . . . . . 207

914.8 Purging . . . . . . . . . . . . . . . . . . . . . 207

915.0 Room Heaters . . . . . . . . . . . . . . . 207

915.1 Application . . . . . . . . . . . . . . . . . . 207

915.2 Electric Room Heaters . . . . . . . . . 207

915.3 Gas-Fired Room Heaters . . . . . . . 207

915.4 Solid-Fuel Type Room Heaters . . 208

916.0 Unit Heaters . . . . . . . . . . . . . . . . . 208

916.1 Application . . . . . . . . . . . . . . . . . . 208

916.2 Support . . . . . . . . . . . . . . . . . . . . 208

916.3 Clearance for Suspended-Type Unit Heaters . . . . . . . . . . . . . . . . . 208

916.4 Combustion and Circulating Air. . . 208

916.5 Ductwork. . . . . . . . . . . . . . . . . . . . 208

916.6 Installation in Commercial

Garages and Aircraft Hangars . . . 208

916.7 Oil-Fired Unit Heaters. . . . . . . . . . 208

917.0 Food Service Appliance, FloorMounted . . . . . . . . . . . . . . . . . . . . 208

917.1 Application . . . . . . . . . . . . . . . . . . 208

917.2 Clearance for Listed Appliances. . . 208

917.3 Mounting on Combustible Floors . . . . . . . . . . . . . . . . . . . . . . 208

917.4 Installation on Noncombustible

Floors . . . . . . . . . . . . . . . . . . . . . . 209

917.5 Combustible Material

Adjacent to Cooking Top . . . . . . . 209

917.6 Use with Casters . . . . . . . . . . . . . 209

917.7 Level Installation. . . . . . . . . . . . . . 209

917.8 Ventilation. . . . . . . . . . . . . . . . . . . 209

918.0 Food Service Appliances, Counter Appliances . . . . . . . . . . . 209

918.1 Application . . . . . . . . . . . . . . . . . . 209

918.2 Vertical Clearance . . . . . . . . . . . . 209

918.3 Clearance for Listed Appliances. . . 209

918.4 Clearance for Unlisted

Appliances . . . . . . . . . . . . . . . . . . 209

919.0 Household Cooking Appliances. . . 209

919.1 Application . . . . . . . . . . . . . . . . . . 209

919.2 Electric Household Cooking Appliances . . . . . . . . . . . . . . . . . . 209

919.3 Gas-Fired Household Cooking Appliances . . . . . . . . . . . . . . . . . . 209

919.4 Floor-Mounted Units . . . . . . . . . . . 210

919.5 Built-In Units . . . . . . . . . . . . . . . . . 210

919.6 Level Installation. . . . . . . . . . . . . . 210

920.0 Cooking Appliance Listings . . . . . 210

920.1 Commercial Electric Ranges . . . . 210

920.2 Commercial Wood-Fired

Baking Ovens . . . . . . . . . . . . . . . . 210

920.3 Oil-Burning Ranges . . . . . . . . . . . 210

921.0 Open-Top Broiler Units. . . . . . . . . 210

921.1 Application . . . . . . . . . . . . . . . . . . 210

921.2 Protection Above Domestic Units. . 210

TABLE OF CONTENTS

921.3 Commercial Units . . . . . . . . . . . . . 210

922.0 Outdoor Cooking Appliances . . . . 210

922.1 Application . . . . . . . . . . . . . . . . . . 210

923.0 Illuminating Appliances. . . . . . . . . 211

923.1 Clearances for Listed Appliances. . 211

923.2 Clearances for Unlisted

Appliances . . . . . . . . . . . . . . . . . . 211

Table 923.2.1 Clearances for Unlisted Outdoor

Open-Flame Illuminating Appliances . . . . . . . . . . . . . . . . . . 211

923.3 Mounting on Buildings . . . . . . . . . 211

923.4 Mounting on Posts . . . . . . . . . . . . 211

923.5 Appliance Pressure Regulators . . . 211

924.0 Incinerators and Crematories . . . . 211

924.1 Field Constructed Commercial Industrial Incinerators . . . . . . . . . . 211

924.2 Factory-Built Commercial Crematories . . . . . . . . . . . . . . . . . 211

924.3 Residential Incinerators . . . . . . . . 211

925.0 Infrared Heaters . . . . . . . . . . . . . . 211

925.1 Application . . . . . . . . . . . . . . . . . . 211

925.2 Support . . . . . . . . . . . . . . . . . . . . . 211

925.3 Clearance . . . . . . . . . . . . . . . . . . . 211

925.4 Combustion and Ventilation Air . . . 212

925.5 Installation in Commercial

Garages and Aircraft Hangars . . . 212

925.6 Electric Radiant Heaters. . . . . . . . 212

926.0 Pool Heaters. . . . . . . . . . . . . . . . . 212

926.1 Application . . . . . . . . . . . . . . . . . . 212

926.2 Location . . . . . . . . . . . . . . . . . . . . 212

926.3 Clearance . . . . . . . . . . . . . . . . . . . 212

926.4 Temperature or PressureLimiting Devices . . . . . . . . . . . . . . 212

926.5 Bypass Valves . . . . . . . . . . . . . . . 212

926.6 Venting . . . . . . . . . . . . . . . . . . . . . 212

927.0 Refrigerators. . . . . . . . . . . . . . . . . 212

927.1 Application . . . . . . . . . . . . . . . . . . 212

927.2 Clearance . . . . . . . . . . . . . . . . . . . 212

927.3 Venting or Ventilating Kits Approved for Use with a Refrigerator. . . . . . . . . . . . . . . . . . 212

928.0 Gas-Fired Toilets . . . . . . . . . . . . . 212

928.1 Clearance . . . . . . . . . . . . . . . . . . . 212

928.2 Installation on Combustible

Floors . . . . . . . . . . . . . . . . . . . . . . 212

928.3 Vents . . . . . . . . . . . . . . . . . . . . . . 212

929.0 Appliances for Installation in Manufactured Housing . . . . . . . 212

929.1 General. . . . . . . . . . . . . . . . . . . . . 212

930.0 Small Ceramic Kilns . . . . . . . . . . . 212

930.1 General. . . . . . . . . . . . . . . . . . . . . 212

930.2 Installation . . . . . . . . . . . . . . . . . . 212

930.3 Fuel-Gas Controls . . . . . . . . . . . . 212

930.4 Electrical Equipment. . . . . . . . . . . 212

930.5 Installations Inside Buildings . . . . 213

930.6 Exterior Installations . . . . . . . . . . . 213

931.0 Outdoor Open Flame Decorative Appliances . . . . . . . . . 213

931.1 General. . . . . . . . . . . . . . . . . . . . . 213

932.0 Evaporative Cooling Systems. . . . 213

932.1 General. . . . . . . . . . . . . . . . . . . . . 213

932.2 Location . . . . . . . . . . . . . . . . . . . . 213

932.3 Access, Inspection, and Repair. . . 213

932.4 Installation . . . . . . . . . . . . . . . . . . 213

933.0 Refrigeration Appliances . . . . . . . 213

933.1 Self-Contained Refrigerators and Freezers . . . . . . . . . . . . . . . . 213

933.2 Unit Coolers . . . . . . . . . . . . . . . . . 214

933.3 Self-Contained Mechanical

Refrigeration Systems . . . . . . . . . 214

934.0 Ductless Mini-Split Systems Installation . . . . . . . . . . . . . . . . . . 214

934.1 General. . . . . . . . . . . . . . . . . . . . . 214

935.0 Air Filter Appliances . . . . . . . . . . . 214

935.1 Electrostatic Air Cleaners . . . . . . . 214

935.2 High-Efficiency Particulate Air Filter Units . . . . . . . . . . . . . . . . 214

936.0 Gaseous Hydrogen Systems . . . . 214

936.1 General. . . . . . . . . . . . . . . . . . . . . 214

937.0 Compressed Natural Gas (CNG) Vehicular Fuel Systems . . . . . . . . 214

937.1 General. . . . . . . . . . . . . . . . . . . . . 214

938.0 Dehumidifiers . . . . . . . . . . . . . . . . 214

938.1 General. . . . . . . . . . . . . . . . . . . . . 214

939.0 Sauna Heaters . . . . . . . . . . . . . . . 214

939.1 Electric Sauna Heaters. . . . . . . . . 214

CHAPTER 10 BOILERS AND

PRESSURE VESSELS . . . . . . . . 215

1001.0 General. . . . . . . . . . . . . . . . . . . . . 217

1001.1 Applicability. . . . . . . . . . . . . . . . . . 217

1001.2 Boiler Rooms and Enclosures . . . 217

1001.3 Air for Combustion

and Ventilation . . . . . . . . . . . . . . . 217

1001.4 Drainage . . . . . . . . . . . . . . . . . . . . 217

1001.5 Mounting. . . . . . . . . . . . . . . . . . . . 217

TABLE OF CONTENTS

1001.6 Chimneys or Vents . . . . . . . . . . . . 217

1002.0 Standards . . . . . . . . . . . . . . . . . . . 217

1002.1 General. . . . . . . . . . . . . . . . . . . . . 217

1002.2 Oil-Burning Boilers . . . . . . . . . . . . 217

1002.3 Electric Boilers . . . . . . . . . . . . . . . 217

1002.4 Solid-Fuel-Fired Boilers . . . . . . . . 217

1002.5 Dual Purpose Water Heaters . . . . 217

1003.0 Detailed Requirements . . . . . . . . . 218

1003.1 Safety Requirements . . . . . . . . . . 218

1003.2 Controls . . . . . . . . . . . . . . . . . . . . 218

1003.3 Gauges . . . . . . . . . . . . . . . . . . . . . 218

1003.4 Stack Dampers . . . . . . . . . . . . . . . 218

1003.5 Welding. . . . . . . . . . . . . . . . . . . . . 218

1004.0 Expansion Tanks . . . . . . . . . . . . . 218

1004.1 General. . . . . . . . . . . . . . . . . . . . . 218

1004.2 Open-Type Expansion Tanks . . . . 218

1004.3 Closed-Type Systems . . . . . . . . . 218

1004.4 Minimum Capacity of ClosedType Tank. . . . . . . . . . . . . . . . . . . 218

Table 1004.4(1) Expansion Tank Capacities for Gravity Hot Water Systems . . . . . 219

Table 1004.4(2) Expansion Tank Capacities for Forced Hot Water Systems . . . . . 219

1005.0 Safety or Relief Valve Discharge . . 219

1005.1 General. . . . . . . . . . . . . . . . . . . . . 219

1005.2 Discharge Piping . . . . . . . . . . . . . 219

1005.3 Splash Shield . . . . . . . . . . . . . . . . 219

1005.4 Hazardous Discharge . . . . . . . . . . 219

1005.5 Vacuum Relief Valve . . . . . . . . . . 219

1006.0 Shutoff Valves . . . . . . . . . . . . . . . 219

1006.1 General. . . . . . . . . . . . . . . . . . . . . 219

1007.0 Gas-Pressure Regulators . . . . . . . 219

1007.1 General. . . . . . . . . . . . . . . . . . . . . 219

1008.0 Low-Water Cutoff . . . . . . . . . . . . . 220

1008.1 General. . . . . . . . . . . . . . . . . . . . . 220

1009.0 Combustion Regulators Safety Valves . . . . . . . . . . . . . . . . 220

1009.1 General. . . . . . . . . . . . . . . . . . . . . 220

1010.0 Clearance for Access . . . . . . . . . . 220

1010.1 General. . . . . . . . . . . . . . . . . . . . . 220

1010.2 Power Boilers . . . . . . . . . . . . . . . . 220

1010.3 Steam-Heating Boilers, Hot Water Boilers, and Power Boilers. . 220

1010.4 Package Boilers, Steam-Heating Boilers, and Hot-Water-Heating Boilers. . . . . . . . . . . . . . . . . . . . . . 220

1011.0 Boilers, Stokers, and Steam

Generators . . . . . . . . . . . . . . . . . . 220

1011.1 General. . . . . . . . . . . . . . . . . . . . . 220

1012.0 Operating Adjustments and Instructions . . . . . . . . . . . . . . . . . . 220

1012.1 General. . . . . . . . . . . . . . . . . . . . . 220

1013.0 Inspections and Tests. . . . . . . . . . 220

1013.1 General. . . . . . . . . . . . . . . . . . . . . 220

1013.2 Operating Permit . . . . . . . . . . . . . 221

1013.3 Maintenance Inspection . . . . . . . . 221

1013.4 Power and Miniature Boilers. . . . . 221

1013.5 Steam-Heating and WaterHeating Boilers . . . . . . . . . . . . . . . 221

1013.6 Automatic Steam-Heating Boilers. . . . . . . . . . . . . . . . . . . . . . 221

1013.7 Unfired Pressure Vessels . . . . . . . 221

1014.0 Operation and Maintenance of

Boilers and Pressure Vessels. . . . 221

1014.1 General. . . . . . . . . . . . . . . . . . . . . 221

Table 1003.2.1 Controls and Limit Devices for

Automatic Boilers . . . . . . . . . . . . . 222

CHAPTER 11 REFRIGERATION . . . . . . . . . . . . 225

1101.0 General. . . . . . . . . . . . . . . . . . . . . 227

1101.1 Applicability. . . . . . . . . . . . . . . . . . 227

1101.2 Equipment . . . . . . . . . . . . . . . . . . 227

Part I Refrigeration Systems . . . . . . . . 227

1102.0 Refrigeration Systems . . . . . . . . . 227

1102.1 General. . . . . . . . . . . . . . . . . . . . . 227

1102.2 Ammonia Refrigeration Systems . . 227

1102.3 Refrigerants . . . . . . . . . . . . . . . . . 227

1103.0 Classification . . . . . . . . . . . . . . . . 227

1103.1 Classification of Refrigerants . . . . 227

Table 1103.1.1 Refrigerant Safety Group Classifications. . . . . . . . . . . . . . . . 227

1103.2 Classification of Refrigeration Systems . . . . . . . . . . . . . . . . . . . . 227

1103.3 Higher Flammability Refrigerants . . . . . . . . . . . . . . . . . 227

1104.0 Requirements for Refrigerant and Refrigeration System Use . . . 227

1104.1 System Selection . . . . . . . . . . . . . 227

1104.2 Refrigerant Concentration Limit (RCL) . . . . . . . . . . . . . . . . . . 227

Table 1104.1 Permissible Refrigeration Systems . . . . . . . . . . . . . . . . . . . . 228

1104.3 Institutional Occupancies . . . . . . . 229

1104.4 Industrial Occupancies and Refrigerated Rooms . . . . . . . . . . . 229

1104.5 Flammable Refrigerants . . . . . . . . 229

TABLE OF CONTENTS

1104.6 Group A2L Refrigerants for Human Comfort . . . . . . . . . . . . . . 229

110.4.7 Applications for Human Comfort and for Nonindustrial

Occupancies. . . . . . . . . . . . . . . . . 230

1104.8 Refrigerant Type and Purity . . . . . 230

1104.9 Changing Refrigerants . . . . . . . . . 231

1105.0 General Requirements . . . . . . . . . 231

1105.1 Human Comfort . . . . . . . . . . . . . . 231

1105.2 Supports and Anchorage . . . . . . . 231

1105.3 Access . . . . . . . . . . . . . . . . . . . . . 231

1105.4 Illumination and Service

Receptacles . . . . . . . . . . . . . . . . . 231

1105.5 Ventilation of Rooms

Containing Condensing Units . . . . 231

1105.6 Prohibited Locations . . . . . . . . . . . 232

1105.7 Condensate . . . . . . . . . . . . . . . . . 232

1105.8 Defrost . . . . . . . . . . . . . . . . . . . . . 232

1105.9 Overflows . . . . . . . . . . . . . . . . . . . 232

1105.10 Condensate, Defrost, and Overflow Disposal. . . . . . . . . . . . . 232

1105.11 Refrigerant Port Protection . . . . . . 232

1105.12 Storage . . . . . . . . . . . . . . . . . . . . . 232

1106.0 Refrigeration Machinery Rooms . . 232

1106.1 Where Required . . . . . . . . . . . . . . 232

1106.2 Refrigeration Machinery Room, General Requirements . . . . . . . . . 232

1106.3 Normal Operation . . . . . . . . . . . . . 233

1106.4 Natural Ventilation . . . . . . . . . . . . 234

1106.5 Combustion Air . . . . . . . . . . . . . . . 234

1106.6 Ventilation Intake . . . . . . . . . . . . . 234

1106.7 Maximum Temperature . . . . . . . . 234

1106.8 Refrigerant Parts in Air Duct. . . . . 234

1106.9 Dimensions. . . . . . . . . . . . . . . . . . 234

1106.10 Exits . . . . . . . . . . . . . . . . . . . . . . . 234

1106.11 Machinery Room, A2L and B2L . . 234

Table 1106.11.10.2 Refrigerant Detector Set Points, Response Times, Alarms, and Ventilation Levels . . . . . . . . . . . . . 235

Table 1106.11.11.2 Level 1 Ventilation Rate for

Class 2L Refrigerants . . . . . . . . . . . 236

1107.0 Machinery Room, Special Requirements . . . . . . . . . . . . . . . . 236

1107.1 General. . . . . . . . . . . . . . . . . . . . . 236

1108.0 Refrigeration Machinery Room Equipment and Controls . . . . . . . . 237

1108.1 General. . . . . . . . . . . . . . . . . . . . . 237

1108.2 Electrical . . . . . . . . . . . . . . . . . . . . 237

1108.3 Emergency Shutoff . . . . . . . . . . . . 237

1108.4 Installation, Maintenance, and Testing . . . . . . . . . . . . . . . . . . . . . 237

1108.5 Emergency Pressure Control System . . . . . . . . . . . . . . . . . . . . . 237

1109.0 Refrigeration Piping, Containers, and Valves . . . . . . . . . . . . . . . . . . 237

1109.1 Materials . . . . . . . . . . . . . . . . . . . . 237

Table 1109.1 Materials for Refrigerant Piping, Tubing, and Fittings . . . . . . . . . . . 239

1109.2 Joints . . . . . . . . . . . . . . . . . . . . . . 239

1109.3 Penetration of Piping . . . . . . . . . . 239

1109.4 Location of Refrigeration Piping . . 239

1109.5 Underground Piping . . . . . . . . . . . 239

1109.6 Support . . . . . . . . . . . . . . . . . . . . . 239

1109.7 Pipe Enclosure . . . . . . . . . . . . . . . 239

1109.8 Visual Inspection . . . . . . . . . . . . . 240

1109.9 Condensation . . . . . . . . . . . . . . . . 240

1109.10 Identification . . . . . . . . . . . . . . . . . 240

1110.0 Valves. . . . . . . . . . . . . . . . . . . . . . 240

1110.1 More than 6.6 Pounds of

Refrigerant . . . . . . . . . . . . . . . . . . 240

1110.2 More than 110 Pounds of

Refrigerant . . . . . . . . . . . . . . . . . . 240

1110.3 Support . . . . . . . . . . . . . . . . . . . . . 240

1110.4 Access . . . . . . . . . . . . . . . . . . . . . 240

1110.5 Identification . . . . . . . . . . . . . . . . . 240

1111.0 Pressure-Limiting Devices . . . . . . 240

1111.1 Where Required . . . . . . . . . . . . . . 240

1111.2 Setting . . . . . . . . . . . . . . . . . . . . . 240

1111.3 Location . . . . . . . . . . . . . . . . . . . . 240

1111.4 Emergency Stop . . . . . . . . . . . . . . 240

1112.0 Pressure-Relief Devices . . . . . . . . 241

1112.1 General. . . . . . . . . . . . . . . . . . . . . 241

1112.2 Positive Displacement Compressor . . . . . . . . . . . . . . . . . 241

1112.3 Liquid-Containing Portions of Systems . . . . . . . . . . . . . . . . . . 241

1112.4 Evaporators . . . . . . . . . . . . . . . . . 241

1112.5 Hydrostatic Expansion . . . . . . . . . 241

1112.6 Actuation. . . . . . . . . . . . . . . . . . . . 242

1112.7 Stop Valves Prohibited . . . . . . . . . 242

1112.8 Location . . . . . . . . . . . . . . . . . . . . 242

1112.9 Materials . . . . . . . . . . . . . . . . . . . . 242

1112.10 Pressure-Relief Valve Setting . . . . 242

1112.11 Discharge from Pressure-Relief Devices. . . . . . . . . . . . . . . . . . . . . 242

1112.12 Discharge Piping . . . . . . . . . . . . . 243

Table 1112.12.4 Atmospheric Pressure at Nominal

Installation Elevation. . . . . . . . . . . 244

TABLE OF CONTENTS

1112.13 Rating of Pressure-Relief Device. . . . . . . . . . . . . . . . . . . . . . 244

1112.14 Rating of Rupture Members and Fusible Plugs . . . . . . . . . . . . . . . . 244

1113.0 Overpressure Protection. . . . . . . . 244

1113.1 General. . . . . . . . . . . . . . . . . . . . . 244

1113.2 Type of Protection . . . . . . . . . . . . 245

1113.3 Discharging into Lowside of System . . . . . . . . . . . . . . . . . . . . . 245

1113.4 Parallel Pressure-Relief Devices . . 245

1113.5 Discharge Capacity . . . . . . . . . . . 245

1113.6 Three-Way Valve . . . . . . . . . . . . . 245

1114.0 Special Discharge Requirements. . 245

1114.1 General. . . . . . . . . . . . . . . . . . . . . 245

1114.2 Design Requirements . . . . . . . . . . 245

1114.3 Testing . . . . . . . . . . . . . . . . . . . . . 245

1115.0 Labeling and Identification . . . . . . 245

1115.1 General. . . . . . . . . . . . . . . . . . . . . 245

1115.2 Volume and Type . . . . . . . . . . . . . 245

1115.3 Permanent Sign . . . . . . . . . . . . . . 245

1115.4 Marking of Pressure-Relief Devices. . . . . . . . . . . . . . . . . . . . . 245

1115.5 Nameplate . . . . . . . . . . . . . . . . . . 245

1116.0 Testing of Refrigeration Equipment . . . . . . . . . . . . . . . . . . 246

1116.1 Factory Tests . . . . . . . . . . . . . . . . 246

1116.2 Field Tests . . . . . . . . . . . . . . . . . . 246

1116.3 Test Gases . . . . . . . . . . . . . . . . . . 246

1116.4 Declaration . . . . . . . . . . . . . . . . . . 246

1116.5 Brine Systems . . . . . . . . . . . . . . . 247

1117.0 Refrigerant-Containing Pressure Vessels . . . . . . . . . . . . . . . . . . . . . 247

1117.1 Inside Dimensions 6 Inches

or Less . . . . . . . . . . . . . . . . . . . . . 247

1117.2 Inside Dimensions More than

6 Inches . . . . . . . . . . . . . . . . . . . . 247

1117.3 Pressure Vessels for 15 psig or Less . . . . . . . . . . . . . . . . . . . . . 247

1118.0 Maintenance and Operation . . . . . 247

1118.1 General. . . . . . . . . . . . . . . . . . . . . 247

Part II Cooling Towers . . . . . . . . . . . . . . 247

1119.0 General. . . . . . . . . . . . . . . . . . . . . 247

1119.1 Applicability. . . . . . . . . . . . . . . . . . 247

1120.0 Support and Anchorage . . . . . . . . 247

1120.1 General. . . . . . . . . . . . . . . . . . . . . 247

1121.0 Drainage . . . . . . . . . . . . . . . . . . . . 247

1121.1 General. . . . . . . . . . . . . . . . . . . . . 247

1122.0 Chemical Treatment Systems . . . 247

1122.1 General. . . . . . . . . . . . . . . . . . . . . 247

1122.2 Automated Control of Cycles of Concentration . . . . . . . . . . . . . . . . 247

1123.0 Location . . . . . . . . . . . . . . . . . . . . 247

1123.1 General. . . . . . . . . . . . . . . . . . . . . 247

1124.0 Electrical . . . . . . . . . . . . . . . . . . . . 247

1124.1 General. . . . . . . . . . . . . . . . . . . . . 247

1125.0 Refrigerants and Hazardous

Fluids . . . . . . . . . . . . . . . . . . . . . . 247

1125.1 General. . . . . . . . . . . . . . . . . . . . . 247

1126.0 Drift Eliminators . . . . . . . . . . . . . . 248

1126.1 General. . . . . . . . . . . . . . . . . . . . . 248

1127.0 Water Supply . . . . . . . . . . . . . . . . 248

1127.1 General . . . . . . . . . . . . . . . . . . . . 248

Table 1102.3 Refrigerant Groups, Properties, and Allowable Quantities . . . . . . . 249

CHAPTER 12 HYDRONICS . . . . . . . . . . . . . . . . 255

1201.0 General. . . . . . . . . . . . . . . . . . . . . 257

1201.1 Applicability. . . . . . . . . . . . . . . . . . 257

1201.2 Insulation . . . . . . . . . . . . . . . . . . . 257

1201.3 Water Hammer Protection . . . . . . 257

1201.4 Terminal Units . . . . . . . . . . . . . . . 257

1201.5 Return-Water Low-Temperature

Protection . . . . . . . . . . . . . . . . . . . 257

1201.6 Heat Transfer Fluid Quality. . . . . . 257

1201.7 Heat Emitters . . . . . . . . . . . . . . . . 257

1201.8 Mechanical Devices . . . . . . . . . . . 257

1201.9 Flexible Connectors . . . . . . . . . . . 257

1201.10 Freeze Protection . . . . . . . . . . . . . 257

Table 1201.10 Percent Glycol Mixtures . . . . . . . . 257

1202.0 Protection of Potable Water

Supply. . . . . . . . . . . . . . . . . . . . . . 257

1202.1 Prohibited Sources . . . . . . . . . . . . 257

1202.2 Chemical Injection . . . . . . . . . . . . 257

1202.3 Compatibility . . . . . . . . . . . . . . . . . 258

1203.0 Capacity of Heat Source. . . . . . . . 258

1203.1 Heat Source . . . . . . . . . . . . . . . . . 258

1203.2 Dual Purpose Water Heaters . . . . 258

Table 1203.2 Water Heaters . . . . . . . . . . . . . . . 258

1203.3 Tankless Water Heaters . . . . . . . 258

1204.0 Identification of Potable and

Nonpotable Water Systems . . . . . 258

1204.1 General. . . . . . . . . . . . . . . . . . . . . 258

1204.2 Color and Information . . . . . . . . . . 258

1204.3 Potable Water. . . . . . . . . . . . . . . . 258

1204.4 Nonpotable Water. . . . . . . . . . . . . 258

TABLE OF CONTENTS

Table 1204.3 Minimum Length of Color Field and Size of Letters. . . . . . . . 258

1204.5 Location of Piping Identification . . . 258

1204.6 Flow Directions . . . . . . . . . . . . . . . 258

1204.7 Heat Transfer Fluid. . . . . . . . . . . . 258

1204.8 Identification of Chemical

Additives . . . . . . . . . . . . . . . . . . . . 258

1205.0 Installation, Testing, and Inspection . . . . . . . . . . . . . . . . . . . 258

1205.1 Operating Instructions . . . . . . . . . 258

1205.2 Pressure Testing . . . . . . . . . . . . . 258

1205.3 Flushing . . . . . . . . . . . . . . . . . . . . 259

1206.0 Pressure and Safety Devices . . . . 259

1206.1 General. . . . . . . . . . . . . . . . . . . . . 259

1206.2 Discharge Piping . . . . . . . . . . . . . 259

1207.0 Heating Appliances and Equipment . . . . . . . . . . . . . . . . . . 259

1207.1 General. . . . . . . . . . . . . . . . . . . . . 259

1207.2 Boilers. . . . . . . . . . . . . . . . . . . . . . 259

1207.3 Dual Purpose Water Heaters . . . . 259

1207.4 Solar Heat Collector Systems. . . . 259

1207.5 Heat Pumps . . . . . . . . . . . . . . . . . 259

1208.0 Circulators and Pumps . . . . . . . . . 259

1208.1 General. . . . . . . . . . . . . . . . . . . . . 259

1208.2 Mounting. . . . . . . . . . . . . . . . . . . . 260

1208.3 Sizing . . . . . . . . . . . . . . . . . . . . . . 260

1209.0 Expansion Tanks . . . . . . . . . . . . . 260

1209.1 General. . . . . . . . . . . . . . . . . . . . . 260

1209.2 Installation . . . . . . . . . . . . . . . . . . 260

1209.3 Closed-Type Tanks . . . . . . . . . . . 260

1209.4 Sizing . . . . . . . . . . . . . . . . . . . . . . 260

1210.0 Materials . . . . . . . . . . . . . . . . . . . . 260

1210.1 Piping, Tubing, and Fittings . . . . . 260

1210.2 Expansion and Contraction . . . . . . 260

1210.3 Hangers and Supports . . . . . . . . . 260

1210.4 Oxygen Diffusion Corrosion . . . . . 260

1211.0 Joints and Connections . . . . . . . . 260

1211.1 General. . . . . . . . . . . . . . . . . . . . . 260

1211.2 Pipe Bends . . . . . . . . . . . . . . . . . . 260

Table 1210.1 Materials for Hydronic System Piping, Tubing, and Fittings . . . . . 261

Table 1211.2.2 Minimum Bend Radius

for PE Pipe Installed in Open Cut Trench . . . . . . . . . . . . . 262

1211.3 Chlorinated Polyvinyl Chloride (CPVC) Pipe . . . . . . . . . . . . . . . . . 262

1211.4 CPVC/AL/CPVC Plastic Pipe and Joints . . . . . . . . . . . . . . . . . . . 262

1211.5 Copper or Copper Alloy Pipe and Tubing . . . . . . . . . . . . . . . . . . 262

1211.6 Crossed-Linked Polyethylene (PEX) Pipe . . . . . . . . . . . . . . . . . . 263

1211.7 Cross-Linked Polyethylene/ Aluminum/Cross-Linked

Polyethylene (PEX-AL-PEX) Pipe. . 263

1211.8 Ductile Iron Pipe . . . . . . . . . . . . . . 263

1211.9 Polyethylene (PE) Plastic Pipe/Tubing. . . . . . . . . . . . 263

1211.10 Polyethylene/Aluminum/ Polyethylene (PE-AL-PE) . . . . . . . 264

1211.11 Polyethylene of Raised Temperature (PE-RT). . . . . . . . . . 264

1211.12 Polypropylene (PP) Pipe. . . . . . . . 264

1211.13 Polyvinyl Chloride (PVC) Pipe . . . 264

1211.14 Steel Pipe and Tubing . . . . . . . . . 265

1211.15 Stainless Steel Pipe and Joints. . . 265

1211.16 Joints Between Various Materials. . 265

1212.0 Valves. . . . . . . . . . . . . . . . . . . . . . 265

1212.1 General. . . . . . . . . . . . . . . . . . . . . 265

1212.2 Where Required . . . . . . . . . . . . . . 265

1212.3 Heat Exchanger . . . . . . . . . . . . . . 265

1212.4 Pressure Vessels . . . . . . . . . . . . . 265

1212.5 Pressure Reducing Valves . . . . . . 265

1212.6 Equipment, Components, and Appliances . . . . . . . . . . . . . . . . . . 265

1212.7 Expansion Tank . . . . . . . . . . . . . . 265

1212.8 Flow Balancing Valves . . . . . . . . . 265

1212.9 Mixing or Temperature Control Valves. . . . . . . . . . . . . . . . . . . . . . 265

1212.10 Thermosiphoning . . . . . . . . . . . . . 265

1212.11 Air Removal Device or Air Vents . . 265

1212.12 District Energy and Central Utility Systems. . . . . . . . . . . . . . . . 265

1213.0 System Controls . . . . . . . . . . . . . . 265

1213.1 Water Temperature Controls . . . . 265

1213.2 Operating Steam Controls . . . . . . 266

1213.3 Occupied Spaces . . . . . . . . . . . . . 266

1213.4 Simultaneous Operation . . . . . . . . 266

1213.5 Temperature Reading. . . . . . . . . . 266

1214.0 Pressure and Flow Controls . . . . . 266

1214.1 Balancing . . . . . . . . . . . . . . . . . . . 266

1214.2 Low-Water Control . . . . . . . . . . . . 266

1214.3 Flow-Sensing Devices . . . . . . . . . 266

1214.4 Automatic Makeup Fluid . . . . . . . . 266

1214.5 Differential Pressure Regulation. . . 266

1214.6 Air-Removal Device . . . . . . . . . . . 266

1214.7 Air-Separation Device. . . . . . . . . . 266

TABLE OF CONTENTS

1214.8 Secondary Loops . . . . . . . . . . . . . 266

1215.0 Hydronic Space Heating. . . . . . . . 266

1215.1 General. . . . . . . . . . . . . . . . . . . . . 266

1215.2 Installation . . . . . . . . . . . . . . . . . . 266

1215.3 Balancing . . . . . . . . . . . . . . . . . . . 267

1215.4 Heat Transfer Fluid. . . . . . . . . . . . 267

1216.0 Steam Systems. . . . . . . . . . . . . . . 267

1216.1 Steam Traps . . . . . . . . . . . . . . . . . 267

1216.2 Sloping for Two-Pipe System . . . . 267

1216.3 Sloping for One-Pipe System . . . . 267

1216.4 Automatic Air Vents . . . . . . . . . . . 267

1216.5 Condensate Flow . . . . . . . . . . . . . 267

1216.6 Steam-Distribution Piping . . . . . . . 267

1217.0 Radiant Heating and Cooling . . . . 267

1217.1 Installation . . . . . . . . . . . . . . . . . . 267

1217.2 Radiant Under-Floor Heating . . . . 267

1217.3 Radiant Cooling Systems . . . . . . . 267

1217.4 Chilled Water

Supply/Distribution Piping . . . . . . . 267

1217.5 Tube Placement . . . . . . . . . . . . . . 267

1217.6 Tube Length . . . . . . . . . . . . . . . . . 267

Table 1217.6 Maximum Length of Continuous Tubing from a Supply-and-Return Manifold Arrangement . . . . . . . . . 267

1217.7 Tube Identification . . . . . . . . . . . . 267

1217.8 Poured Floor Structural Concrete

Slab Systems (Thermal Mass) . . . 268

1217.9 Joist Systems and Subfloors . . . . 268

1217.10 Wall and Ceiling Panels . . . . . . . . 268

1217.11 Radiant Heating and Cooling

Panels. . . . . . . . . . . . . . . . . . . . . . 268

1218.0 Heat Exchangers . . . . . . . . . . . . . 269

1218.1 General. . . . . . . . . . . . . . . . . . . . . 269

1219.0 Indirect-Fired Domestic

Hot-Water Storage Tanks. . . . . . . 269

1219.1 General. . . . . . . . . . . . . . . . . . . . . 269

1220.0 Snow and Ice Melt Systems . . . . . 269

1220.1 Use of Chemical Additives

and Corrosive Fluids. . . . . . . . . . . 269

1220.2 Types of Tube Fasteners . . . . . . . 269

1220.3 Spacing of Tube Fasteners . . . . . 269

1220.4 Snow and Ice Melt Controls . . . . . 269

Table 1220.4.2 Maximum Loop Lengths for Snow and Ice Melt Systems . . . . . 270

1220.5 Hydronic Makeup Air Units . . . . . . 270

1221.0 Piping Installation . . . . . . . . . . . . . 270

1221.1 General. . . . . . . . . . . . . . . . . . . . . 270

1221.2 Embedded Piping Materials and Joints . . . . . . . . . . . . . . . . . . . 270

1221.3 Pressure Testing . . . . . . . . . . . . . 270

1221.4 System Drainage . . . . . . . . . . . . . 270

1221.5 Condensate Drainage. . . . . . . . . . 271

1221.6 Hydronic Fluid Disposal . . . . . . . . 271

1221.7 Clearance to Combustibles . . . . . 271

CHAPTER 13 FUEL GAS PIPING . . . . . . . . . . . 273

1301.0 Scope of Gas Piping . . . . . . . . . . 275

1301.1 Applicability. . . . . . . . . . . . . . . . . . 275

1302.0 Coverage of Piping System . . . . . 275

1302.1 General. . . . . . . . . . . . . . . . . . . . . 275

1302.2 Piping System Requirements . . . . 275

1302.3 Applications . . . . . . . . . . . . . . . . . 275

1303.0 Inspection . . . . . . . . . . . . . . . . . . . 275

1303.1 Inspection Notification . . . . . . . . . 275

1303.2 Excavation . . . . . . . . . . . . . . . . . . 275

1303.3 Type of Inspections . . . . . . . . . . . 275

1303.4 Inspection Waived . . . . . . . . . . . . 276

1304.0 Certificate of Inspection . . . . . . . . 276

1304.1 Issuance . . . . . . . . . . . . . . . . . . . . 276

1304.2 Gas Supplier. . . . . . . . . . . . . . . . . 276

1304.3 Unlawful . . . . . . . . . . . . . . . . . . . . 276

1305.0 Authority to Render Gas Service . . 276

1305.1 Authorized Personnel . . . . . . . . . . 276

1305.2 Outlets . . . . . . . . . . . . . . . . . . . . . 276

1306.0 Authority to Disconnect. . . . . . . . . 276

1306.1 Disconnection . . . . . . . . . . . . . . . . 276

1306.2 Notice . . . . . . . . . . . . . . . . . . . . . . 276

1306.3 Capped Outlets. . . . . . . . . . . . . . . 276

1307.0 Temporary Use of Gas . . . . . . . . . 276

1307.1 General. . . . . . . . . . . . . . . . . . . . . 276

1308.0 Gas Piping System Design, Materials, and Components . . . . . 276

1308.1 Installation of Piping System . . . . 276

1308.2 Interconnections Supplying Separate Users. . . . . . . . . . . . . . . 276

1308.3 Sizing of Gas Piping Systems . . . 277

1308.4 Acceptable Piping Materials and Joining Methods . . . . . . . . . . 277

Table 1308.3.1 Approximate Gas Input for Typical Appliances . . . . . . . . . . . . 277

Table 1308.4.6.2 Specifications for Threading Metallic Pipe . . . . . . . . . . . . . . . . . 278

1308.5 Gas Meters . . . . . . . . . . . . . . . . . . 280

1308.6 Gas Pressure Regulators . . . . . . . 280

1308.7 Overpressure Protection. . . . . . . . 281

TABLE OF CONTENTS

1308.8 Pressure Limitation

Requirements . . . . . . . . . . . . . . . . 281

1308.9 Overpressure Protection Devices. . . . . . . . . . . . . . . . . . . . . 281

1308.10 Backpressure Protection . . . . . . . 282

1308.11 Low-Pressure Protection . . . . . . . 282

1308.12 Shutoff Valves . . . . . . . . . . . . . . . 282

Table 1308.12 Manual Gas Valve Standards. . . . 282

1308.13 Expansion and Flexibility . . . . . . . 282

1308.14 Pressure Regulator and Pressure Control Venting . . . . . . . 282

1309.0 Excess Flow Valve . . . . . . . . . . . . 283

1309.1 General. . . . . . . . . . . . . . . . . . . . . 283

1310.0 Gas Piping Installation . . . . . . . . . 283

1310.1 Piping Underground . . . . . . . . . . . 283

1310.2 CSST Piping Systems . . . . . . . . . 284

1310.3 Installation of Aboveground Piping . . . . . . . . . . . . . . . . . . . . . . 284

Table 1310.3.5.1 Support of Piping . . . . . . . . . . . . . 285

1310.4 Concealed Piping in Buildings . . . 285

1310.5 Piping in Vertical Chases . . . . . . . 286

1310.6 Maximum Operating Pressure in Buildings . . . . . . . . . . . . . . . . . . 286

1310.7 Appliance Overpressure Protection . . . . . . . . . . . . . . . . . . . 286

1310.8 Gas Pipe Turns. . . . . . . . . . . . . . . 286

1310.9 Drips and Sediment Traps . . . . . . 287

1310.10 Outlets . . . . . . . . . . . . . . . . . . . . . 287

1310.11 Manual Gas Shutoff Valves . . . . . 287

1310.12 Prohibited Devices . . . . . . . . . . . . 288

1310.13 Systems Containing Gas-Air Mixtures Outside the Flammable

Range . . . . . . . . . . . . . . . . . . . . . . 288

1310.14 Systems Containing Flammable Gas-Air Mixtures. . . . . . . . . . . . . . 288

1311.0 Electrical Bonding and Grounding. . . . . . . . . . . . . . . . . . . 289

1311.1 Pipe and Tubing other than CSST . . . . . . . . . . . . . . . . . . . . . . 289

1311.2 Bonding of CSST Gas Piping . . . . 289

1311.3 Arc-Resistant Jacketed CSST . . . 289

1311.4 Prohibited Use . . . . . . . . . . . . . . . 289

1311.5 Lightning Protection System. . . . . 289

1311.6 Electrical Circuits . . . . . . . . . . . . . 289

1311.7 Electrical Connections . . . . . . . . . 289

1312.0 Appliance and Equipment Connections to Building Piping. . . 289

1312.1 Connecting Appliances and Equipment . . . . . . . . . . . . . . . . . . 289

1312.2 Suspended Low-Intensity Infrared Tube Heaters . . . . . . . . . 290

1312.3 Use of Nonmetallic Gas Hose

Connectors . . . . . . . . . . . . . . . . . . 290

1312.4 Injection (Bunsen) Burners . . . . . . 290

1312.5 Connection of Portable and

Mobile Industrial Appliances. . . . . 290

1312.6 Appliance Shutoff Valves and Connections. . . . . . . . . . . . . . 291

1312.7 Quick-Disconnect Devices . . . . . . 291

1312.8 Gas Convenience Outlets. . . . . . . 291

1312.9 Sediment Trap . . . . . . . . . . . . . . . 291

1312.10 Installation of Piping . . . . . . . . . . . 291

1312.11 Liquefied Petroleum Gas Facilities and Piping . . . . . . . . . . . 291

1313.0 Pressure Testing, Inspection, and Purging. . . . . . . . . . . . . . . . . . 291

1313.1 Piping Installations . . . . . . . . . . . . 291

1313.2 Test Preparation . . . . . . . . . . . . . . 292

1313.3 Test Pressure . . . . . . . . . . . . . . . . 292

1313.4 Detection of Leaks and Defects . . 292

1313.5 Piping System Leak Test . . . . . . . 292

1313.6 Purging Requirements . . . . . . . . . 292

Table 1313.6.1 Size and Length of Piping. . . . . . . 293

1314.0 Required Gas Supply . . . . . . . . . . 293

1314.1 General. . . . . . . . . . . . . . . . . . . . . 293

1314.2 Volume . . . . . . . . . . . . . . . . . . . . . 293

1314.3 Gas Appliances . . . . . . . . . . . . . . 294

1314.4 Size of Piping Outlets . . . . . . . . . . 294

1315.0 Required Gas Piping Size . . . . . . 294

1315.1 Pipe Sizing Methods. . . . . . . . . . . 294

1315.2 Sizing of Gas Piping Systems . . . 294

1315.3 Sizing Equations. . . . . . . . . . . . . . 294

Table 1315.3 Cr and Y for Natural Gas and

Undiluted Propane at Standard Conditions. . . . . . . . . . . . . . . . . . . 295

1315.4 Sizing of Piping Sections . . . . . . . 295

1315.5 Engineering Methods . . . . . . . . . . 295

1315.6 Variable Gas Pressures . . . . . . . . 295

Table 1315.2(1) Schedule 40 Metallic Pipe . . . . . . 297

Table 1315.2(2) Schedule 40 Metallic Pipe . . . . . . 298

Table 1315.2(3) Schedule 40 Metallic Pipe . . . . . . 299

Table 1315.2(4) Schedule 40 Metallic Pipe . . . . . . 300

Table 1315.2(5) Schedule 40 Metallic Pipe . . . . . . 301

Table 1315.2(6) Schedule 40 Metallic Pipe . . . . . . 302

Table 1315.2(7) Semi-Rigid Copper Tubing . . . . . . 303

Table 1315.2(8) Semi-Rigid Copper Tubing . . . . . . 304

Table 1315.2(9) Semi-Rigid Copper Tubing . . . . . . 305

TABLE OF CONTENTS

Table 1315.2(10) Semi-Rigid Copper Tubing . . . . . . 306

Table 1315.2(11) Semi-Rigid Copper Tubing . . . . . . 307

Table 1315.2(12) Semi-Rigid Copper Tubing . . . . . . 308

Table 1315.2(13) Semi-Rigid Copper Tubing . . . . . . 309

Table 1315.2(14) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 310

Table 1315.2(15) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 311

Table 1315.2(16) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 312

Table 1315.2(17) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 313

Table 1315.2(18) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 314

Table 1315.2(19) Polyethylene Plastic Pipe . . . . . . . 315

Table 1315.2(20) Polyethylene Plastic Pipe . . . . . . . 216

Table 1315.2(21) Polyethylene Plastic Pipe . . . . . . . 317

Table 1315.2(22) Polyethylene Plastic Tubing . . . . . 318

Table 1315.2(23) Polyethylene Plastic Tubing . . . . . 318

Table 1315.2(24) Schedule 40 Metallic Pipe . . . . . . 319

Table 1315.2(25) Schedule 40 Metallic Pipe . . . . . . 320

Table 1315.2(26) Schedule 40 Metallic Pipe . . . . . . 321

Table 1315.2(27) Schedule 40 Metallic Pipe . . . . . . 322

Table 1315.2(28) Semi-Rigid Copper Tubing . . . . . . 323

Table 1315.2(29) Semi-Rigid Copper Tubing . . . . . . 324

Table 1315.2(30) Semi-Rigid Copper Tubing . . . . . . 330

Table 1315.2(31) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 326

Table 1315.2(32) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 327

Table 1315.2(33) Corrugated Stainless Steel Tubing (CSST) . . . . . . . . . . . . . . . 328

Table 1315.2(34) Polyethylene Plastic Pipe . . . . . . . 329

Table 1315.2(35) Polyethylene Plastic Pipe . . . . . . . 330

Table 1315.2(36) Polyethylene Plastic Tubing . . . . . 331

CHAPTER 14 PROCESS PIPING. . . . . . . . . . . . 333

1401.0 General. . . . . . . . . . . . . . . . . . . . . 335

1401.1 Applicability. . . . . . . . . . . . . . . . . . 335

1402.0 Permit . . . . . . . . . . . . . . . . . . . . . . 335

1402.1 General. . . . . . . . . . . . . . . . . . . . . 335

1403.0 Plans Required . . . . . . . . . . . . . . . 335

1403.1 General. . . . . . . . . . . . . . . . . . . . . 335

1404.0 Workmanship . . . . . . . . . . . . . . . . 335

1404.1 General. . . . . . . . . . . . . . . . . . . . . 335

1405.0 Inspections . . . . . . . . . . . . . . . . . . 335

1405.1 General. . . . . . . . . . . . . . . . . . . . . 335

1405.2 Required Inspections . . . . . . . . . . 335

1405.3 Other Inspections . . . . . . . . . . . . . 335

1406.0 Pipe, Tubing, and Fittings. . . . . . . 335

1406.1 General. . . . . . . . . . . . . . . . . . . . . 335

1406.2 Hazardous Process

Piping (HPP). . . . . . . . . . . . . . . . . 335

1406.3 Special Requirements for HPP Gases . . . . . . . . . . . . . . . . . . . . . . 336

CHAPTER 15 SOLAR ENERGY SYSTEMS. . . . 337

1501.0 General. . . . . . . . . . . . . . . . . . . . . 339

1501.1 Applicability. . . . . . . . . . . . . . . . . . 339