(a) The rules of Part HG apply to steam heating boilers, hot water heating boilers, hot water supply boilers, and to appurtenances thereto. They shall be used in conjunction with the specific requirements in Part HF, Boilers of Wrought Materials, Part HC, Cast Iron Boilers, and Part HA, Cast Aluminum Boilers whichever is applicable. The foreword provides the basis for these rules. Part HG is not intended to apply to potable water heaters except as provided for in Part HLW. Boilers with economizers shall follow the rules of Mandatory Appendix 10.

In 1911, The American Society of Mechanical Engineers established the Boiler and Pressure Vessel Committee to formulate standard rules for the construction of steam boilers and other pressure vessels###. In 2009, the Boiler and Pressure Vessel Committee was superseded by the following committees:
(a) Committee on Power Boilers (I)
(b) Committee on Materials (II)
(c) Committee on Construction of Nuclear Facility Components (III)
(d) Committee on Heating Boilers (IV)
(e) Committee on Nondestructive Examination (V)
(f) Committee on Pressure Vessels (VIII)
(g) Committee on Welding, Brazing, and Fusing (IX)
(h) Committee on Fiber-Reinforced Plastic Pressure Vessels (X)
(i) Committee on Nuclear Inservice Inspection (XI)
(j) Committee on Transport Tanks (XII)
(k) Technical Oversight Management Committee (TOMC)
Where reference is made to "the Committee" in this Foreword, each of these committees is included individually and collectively.
The Committee's function is to establish rules of safety relating only to pressure integrity, which govern the construction ** of boilers, pressure vessels, transport tanks, and nuclear components, and the inservice inspection of nuclear components and transport tanks. The Committee also interprets these rules when questions arise regarding their intent. The technical consistency of the Sections of the Code and coordination of standards development activities of the Committees is supported and guided by the Technical Oversight Management Committee. This Code does not address other safety issues relating to the construction of boilers, pressure vessels, transport tanks, or nuclear components, or the inservice inspection of nuclear components or transport tanks. Users of the Code should refer to the pertinent codes, standards, laws, regulations, or other relevant documents for safety issues other than those relating to pressure integrity. Except for Sections XI and XII, and with a few other exceptions, the rules do not, of practical necessity, reflect the likelihood and consequences of deterioration in service related to specific service fluids or external operating environments. In formulating the rules, the Committee considers the needs of users, manufacturers, and inspectors of pressure vessels. The objective of the rules is to afford reasonably certain protection of life and property, and to provide a margin for deterioration in service to give a reasonably long, safe period of usefulness. Advancements in design and materials and evidence of experience have been recognized.
This Code contains mandatory requirements, specific prohibitions, and nonmandatory guidance for construction activities and inservice inspection and testing activities. The Code does not address all aspects of these activities and those aspects that are not specifically addressed should not be considered prohibited. The Code is not a handbook and cannot replace education, experience, and the use of engineering judgment. The phrase engineering judgment refers to technical judgments made by knowledgeable engineers experienced in the application of the Code. Engineering judgments must be consistent with Code philosophy, and such judgments must never be used to overrule mandatory requirements or specific prohibitions of the Code.
The Committee recognizes that tools and techniques used for design and analysis change as technology progresses and expects engineers to use good judgment in the application of these tools. The designer is responsible for complying with Code rules and demonstrating compliance with Code equations when such equations are mandatory. The Code neither requires nor prohibits the use of computers for the design or analysis of components constructed to the requirements of the Code. However, designers and engineers using computer programs for design or analysis are cautioned that they are responsible for all technical assumptions inherent in the programs they use and the application of these programs to their design.The rules established by the Committee are not to be interpreted as approving, recommending, or endorsing any proprietary or specific design, or as limiting in any way the manufacturer's freedom to choose any method of design or any form of construction that conforms to the Code rules.The Committee meets regularly to consider revisions of the rules, new rules as dictated by technological development, Code Cases, and requests for interpretations. Only the Committee has the authority to provide official interpretations of this Code. Requests for revisions, new rules, Code Cases, or interpretations shall be addressed to the Secretary in writing and shall give full particulars in order to receive consideration and action (see Submittal of Technical Inquiries to the Boiler and Pressure Vessel Standards Committees). Proposed revisions to the Code resulting from inquiries will be presented to the Committee for appropriate action. The action of the Committee becomes effective only after confirmation by ballot of the Committee and approval by ASME. Proposed revisions to the Code approved by the Committee are submitted to the American National Standards Institute (ANSI) and published at http://go.asme.org/BPVCPublicReview to invite comments from all interested persons. After public review and final approval by ASME, revisions are published at regular intervals in Editions of the Code.The Committee does not rule on whether a component shall or shall not be constructed to the provisions of the Code. The scope of each Section has been established to identify the components and parameters considered by the Committee in formulating the Code rules. Questions or issues regarding compliance of a specific component with the Code rules are to be directed to the ASME Certificate Holder (Manufacturer). Inquiries concerning the interpretation of the Code are to be directed to the Committee. ASME is to be notified should questions arise concerning improper use of an ASME Certification Mark.When required by context in this Section, the singular shall be interpreted as the plural, and vice versa, and the feminine, masculine, or neuter gender shall be treated as such other gender as appropriate.

List of Sections xii

Foreword xiv

Statement of Policy on the Use of the Certification Mark and Code Authorization in Advertising xvi

Statement of Policy on the Use of ASME Marking to Identify Manufactured Items xvi

Submittal of Technical Inquiries to the Boiler and Pressure Vessel Standards Committees xvii

Personnel xx

Preamble xxxix

Summary of Changes xl

List of Changes in Record Number Order xlv

Cross-Referencing and Stylistic Changes in the Boiler and Pressure Vessel Code xlvii

Part HG General Requirements for All Materials of Construction 1

Article 1 Scope and Service Restrictions 1

      HG-100 Scope 1

      HG-101 Service Restrictions 1

      HG-102 Units 1

      HG-103 Tolerances 2

Article 2 Material Requirements 3

      HG-200 General Material Requirements 3

      HG-201 Specific Material Requirements 3

Article 3 Design 4

      HG-300 Design Pressure 4

      HG-301 Cylindrical Parts Under Internal Pressure 4

      HG-305 Formed Heads, Pressure on Concave Side 4

      HG-306 Formed Heads, Pressure on Convex Side 5

      HG-307 Flat Heads 5

      HG-309 Spherically Dished Covers (Bolted Heads) 9

      HG-312 Cylindrical Parts Under External Pressure 11

      HG-320 Openings in Boilers, General Requirements 14

      HG-321 Reinforcement Required for Openings in Shells and Formed Heads 15

      HG-323 Flanged-In Openings in Formed Heads 15

      HG-325 Reinforcement Required for Openings in Flat Heads 16

      HG-326 Limits of Metal Available for Reinforcement 17

      HG-327 Strength of Reinforcement 20

      HG-328 Reinforcement for Multiple Openings 20

      HG-330 Inspection and Access Openings 20

      HG-340 Stayed Surfaces 21

      HG-341 Staybolts 23

      HG-342 Dimensions of Stays 23

      HG-343 Dimensions of Diagonal Stays 23

      HG-345 Staying of Heads 25

      HG-346 Tubesheets with Firetubes Used as Stays 26

      HG-350 Ligaments 26

      HG-360 Requirements for Tube Holes and Tube Attachments 29

      HG-370 External Piping Connections 31

Article 4 Pressure-Relieving Devices 32

      HG-400 Pressure-Relieving Valve Requirements 32

      HG-401 Minimum Requirements for Safety and Safety Relief Valves 33

      HG-402 Discharge Capacities of Safety and Safety Relief Valves 34

      HG-403 Heating Surface 37

      HG-405 Temperature and Pressure Safety Relief Valves 37

Article 5 Tests, Inspection, and Stamping 38

      HG-500 Proof Tests to Establish Design Pressure 38

Article 6 Instruments, Fittings, and Controls 51

      HG-600 General 51

      HG-601 For Steam Heating Boilers 51

      HG-610 For Hot Water Heating or Hot Water Supply Boilers 53

      HG-620 For All Boilers 54

      HG-630 Electric Wiring 54

      HG-640 Controls and Heat Generating Apparatus 55

Article 7 Installation Requirements 56

      HG-700 Installation Requirements, All Boilers 56

Part HF Requirements for Boilers Constructed of Wrought Materials 65

Article 1 General 65

      HF-100 Scope 65

Article 2 Material Requirements 66

      HF-200 General Material Requirements 66

      HF-201 Plate 66

      HF-202 Rods, Bars, and Shapes 66

      HF-203 Prefabricated or Preformed Pressure Parts 66

      HF-204 Pipe and Tubes 67

      HF-205 Material Not Fully Identified 68

      HF-206 Recertification of Material Produced to a Specification Not Permitted by This Section 69

      HF-207 Austenitic Stainless Steel 69

      HF-210 Maintaining Material Identification 69

Article 3 Design Stresses and Minimum Thicknesses 70

      HF-300 Maximum Allowable Stress Values 70

      HF-301 Minimum Thicknesses 70

      HF-302 Basis for Establishing Stress Values in Table HF-300.1 (HF-300.1M) or Table HF-300.2 (HF-300.2M) 70

Part HF - Subpart HW Requirements for Boilers Fabricated by Welding 96

Article 4 General Requirements 96

      HW-400 Scope 96

      HW-401 Responsibility of Manufacturer or Contractor 96

Article 5 Material Requirements 97

      HW-500 Permissible Materials 97

      HW-501 Materials of Different Specifications 97

      HW-502 Materials for Small Parts 97

Article 6 Welding Processes and Qualifications 98

      HW-600 Welding Processes 98

      HW-610 Welding Qualifications 98

      HW-611 No Production Work Without Qualifications 98

      HW-612 Interchange of Qualifying Tests Among Manufacturers Prohibited 98

      HW-613 Maintenance of Records of Qualifications and Identifying Marks 98

Article 7 Design of Weldments 99

      HW-700 Design of Welded Joints 99

Article 8 Fabrication Requirements 113

      HW-800 Forming Plates 113

      HW-801 Base Metal Preparation 113

      HW-810 Assembly 113

      HW-812 Alignment Tolerance 113

      HW-813 Distortion 113

      HW-820 Specific Welding Requirements 114

      HW-830 Repair of Weld Defects 115

      HW-840 Posthydrotest Welding of Nonpressure Parts to Pressure Parts 115

Article 9 Inspection 116

      HW-900 Inspection During Fabrication 116

      HW-910 Check of Welding Procedure Qualifications 116

      HW-911 Check of Welder and Welding Operator Performance Qualifications 116

Part HF - Subpart HB Requirements for Boilers Fabricated by Brazing 117

Article 10 General Requirements 117

      HB-1000 Scope 117

      HB-1001 Responsibility of Manufacturer or Contractor 117

Article 11 Material Requirements 118

      HB-1100 General 118

      HB-1101 Combinations of Dissimilar Materials 118

      HB-1102 Brazing Filler Metals 118

      HB-1103 Fluxes and Atmospheres 118

Article 12 Brazing Processes, Procedures, and Qualifications 119

      HB-1200 Brazing Processes 119

      HB-1201 Joint Brazing Procedures 119

      HB-1202 Brazing Qualifications and Records 119

Article 13 Design 120

      HB-1300 Strength of Brazed Joints 120

      HB-1301 Brazed Joint Efficiency Factors 120

      HB-1302 Minimum Thickness 120

      HB-1303 Permissible Service Temperature 120

      HB-1304 Application of Brazing Filler Metal 120

      HB-1305 Joint Clearance 120

      HB-1306 Openings 121

      HB-1307 Brazed Connections 121

Article 14 Fabrication Requirements 122

      HB-1400 Cleaning of Surfaces to Be Brazed 122

      HB-1401 Postbrazing Operations 122

      HB-1402 Repair of Defective Brazing 122

Article 15 Inspection and Stamping 123

      HB-1500 Inspection 123

Part HC Requirements for Boilers Constructed of Cast Iron 124

Article 1 General 124

      HC-100 Scope 124

Article 2 Material Requirements 125

      HC-200 General Material Requirements 125

      HC-201 Manufacture 125

      HC-202 Chemical Composition 125

      HC-203 Tensile Strength Classification 125

      HC-204 Test Bars 125

      HC-205 Selection of Test Bar Size 125

      HC-206 Molding and Pouring Test Bars 125

      HC-207 Number of Tests 125

      HC-208 Tension Test 127

      HC-209 Tension Test Procedure 127

      HC-210 Tension Retests 127

      HC-211 Transverse Test 127

      HC-212 Transverse Test Procedure 127

      HC-213 Transverse Retests 127

      HC-214 Workmanship, Finish, and Repair 128

      HC-215 Examinations and Tests 129

      HC-216 Test Records 129

Article 3 Design 130

      HC-300 Maximum Allowable Stress Values 130

      HC-301 Basis for Establishing Stress Values in Table HC-300 130

      HC-310 Heads 130

      HC-311 Spherically Shaped Covers 130

      HC-315 Openings and Reinforcements 132

      HC-320 Corners and Fillets 132

      HC-325 Washout Openings 132

      HC-330 Assembly Method 133

Article 4 Tests 134

      HC-400 Tests to Establish Design Pressure 134

Article 5 Quality Control and Inspection 136

      HC-501 General 136

      HC-502 Outline of Features to Be Included in the Written Description of the Quality Control System 136

      HC-510 Examination 137

      HC-520 Certificates of Conformance 137

Part HA Requirements for Boilers Constructed of Cast Aluminum 139

Article 1 General 139

      HA-100 Scope 139

Article 2 Material Requirements 140

      HA-200 General Material Requirements 140

      HA-201 Workmanship, Finish, and Repair 140

      HA-202 Examinations and Tests 140

      HA-203 Test Records 141

Article 3 Design 142

      HA-300 Maximum Allowable Stress Values 142

      HA-301 Heads and Spherically Shaped Covers 142

      HA-302 Openings and Reinforcements 142

      HA-303 Corners and Fillets 142

      HA-304 Washout Openings 142

      HA-305 Assembly Method 142

Article 4 Tests 143

      HA-400 Tests to Establish Design Pressure 143

Article 5 Quality Control and Inspection 145

      HA-501 General 145

      HA-502 Outline of Features to Be Included in the Written Description of the Quality Control System 145

      HA-503 Examination 146

      HA-504 Certificates of Conformance 146

Part HLW Requirements for Potable-Water Heaters 148

Introduction 148

Article 1 General 150

      HLW-100 Scope 150

      HLW-101 Service Limits 150

      HLW-102 Permissible Stamping 150

      HLW-103 Units 150

Article 2 Material Requirements 152

      HLW-200 Lining 152

      HLW-201 Primary Pressure Parts Material 153

      HLW-202 Acceptance of Unidentified or Small Quantities of Material 153

      HLW-203 Miscellaneous Pressure Parts Material 154

      HLW-204 Flanges and Pipe Fittings 154

      HLW-205 Nonpressure Part Material 154

Article 3 Design 155

      HLW-300 Design 155

      HLW-301 Basis for Establishing Stress Values in Tables HLW-300 and HLW-301 155

      HLW-302 Minimum Thicknesses 155

      HLW-303 Shells Under Internal Pressure 159

      HLW-305 Blank Unstayed Dished Heads, Pressure on Concave Side 159

      HLW-306 Blank Unstayed Dished Heads, Pressure on Convex Side 160

      HLW-307 Tubes 160

      HLW-308 Openings 160

      HLW-309 Tubes Attached by Rolling 160

      HLW-310 Storage Tanks 160

Article 4 Design of Weldments 162

      HLW-400 Design of Welded Joints 162

Article 5 Tests 177

      HLW-500 Tests to Establish Maximum Allowable Working Pressure and Production Line Tests 177

Article 6 Inspection and Stamping 179

      HLW-600 Inspection and Certification 179

      HLW-601 Manufacturer's Data and Partial Data Reports 179

      HLW-602 Stamping of Water Heaters and Storage Tanks 180

Article 7 Controls 182

      HLW-700 Controls 182

Article 8 Installation Requirements 183

      HLW-800 Safety Relief Valves 183

      HLW-801 Mounting Safety Relief Valves 183

      HLW-805 Water Supply 184

      HLW-809 Provisions for Thermal Expansion in Hot Water Systems 184

      HLW-810 Bottom Drain Valve 184

      HLW-820 Thermometer 185

Mandatory Appendix 2 Codes, Standards, and Specifications Referenced in Text 187

2-100 Reference Standards 187

2-200 Organizations 188

Mandatory Appendix 3 Adhesive Attachment of Nameplates to Casing 189

3-100 Scope 189

3-101 Nameplate Application Procedure Qualification 189

Mandatory Appendix 4 Guide to Manufacturer's Data Report Forms 190

4-100 Introduction 190

4-200 Data Report Forms 191

4-300 Certificates of Conformance 191

Mandatory Appendix 5 Vacuum Boilers 217

5-100 Scope 217

5-200 Maximum Pressure and Temperature 217

5-300 Design Parameters 217

5-400 Welding 217

5-500 Alternative to Hydrotest 217

5-600 Instruments, Fittings, and Controls 218

5-700 Inspection Openings 218

Mandatory Appendix 6 Standard Units for Use in Equations 219

Mandatory Appendix 7 Rules for Mass-Production of Heating Boilers 220

7-100 Introduction 220

7-200 Scope 220

7-300 General 220

7-400 Quality Control Procedures 220

7-500 Data Reports 221

Mandatory Appendix 8 Criteria for Reapplication of a Certification Mark 222

8-100 Introduction 222

8-200 Conditions 222

8-300 Rules 222

Mandatory Appendix 9 Establishing Governing Code Editions, Addenda, and Cases for Heating Boilers and Replacement Parts 225

9-100 General 225

9-200 Design 225

9-300 Materials 225

9-400 Fabrication 225

9-500 Examination 225

9-600 Inspection 225

9-700 Testing 226

9-800 Overpressure Protection 226

9-900 Field Assembly 226

9-1000 Certification 226

Mandatory Appendix 10 Requirements for Feedwater Economizers 227

10-100 General 227

10-200 Design 227

10-300 Pressure Relief 227

Nonmandatory Appendix A Estimating Pressure Relief Valve Capacity Requirements 228

A-100 228

Nonmandatory Appendix B Method of Checking Safety Valve and Safety Relief Valve Capacity by Measuring Maximum Amount of Fuel That Can Be Burned 229

B-100 Procedure 229

B-101 Examples 229

B-102 Heats of Combustion of Fuels 229

Nonmandatory Appendix C Examples of Method of Calculating a Welded Ring Reinforced Furnace 231

C-100 For a Steam or Hot Water Boiler 231

C-101 For a Hot Water Boiler 232

Nonmandatory Appendix D Examples of Methods of Computation of Openings in Boiler Shells . . 233

D-100 Pad Reinforced Opening 233

D-101 Nozzle Reinforced Opening 234

Nonmandatory Appendix E Terminology 236

E-100 Terms Relating to Design 236

E-101 Terms Relating to Welding 237

Nonmandatory Appendix F Quality Control System 240

F-100 General 240

F-202 Outline of Features to Be Included in the Written Description of the Quality Control System 240

Nonmandatory Appendix H List of Abbreviations and Addresses 242

Nonmandatory Appendix K Guide to Information Appearing on Certificate of Authorization 243

Nonmandatory Appendix M Guidance for the Use of U.S. Customary and SI Units in the ASME Boiler and Pressure Vessel Code 246

M-100 Use of Units in Equations 246

M-200 Guidelines Used to Develop SI Equivalents 246

M-300 Soft Conversion Factors 248

Nonmandatory Appendix N Guide to Manufacturer's Certificate of Conformance for Pressure Relief Valves 249

Introduction 249

FIGURES

HG-307 Some Acceptable Types of Unstayed Flat Heads and Covers 6

HG-309 Spherically Dished Steel Plate Covers With Bolting Flanges 10

HG-312.4 Acceptable Type of Ring-Reinforced Furnace 12

HG-312.7 Connection Between Plain and Corrugated Furnace 13

HG-312.8 Acceptable Type of Semicircular Furnace Reinforcement 14

HG-321 Chart for Determining Values of F 16

HG-326.1 Some Representative Configurations Describing the Reinforcement Dimension, te, and the Finished Opening Dimension, d 18

HG-326.2 Nomenclature and Formulas for Reinforced Openings 19

HG-340.1 Pitch of Staybolts Adjacent to Upper Corners of Fireboxes 22

HG-340.2 Acceptable Proportions for Ends of Through-Stays 22

HG-340.3 Examples of Acceptable Corner Welds for Pressures Not Over 30 psi 22

HG-343 Details of Installation of Diagonal Stays 25

HG-345.1(a) Sketch Showing Application of HG-345.1 to the Staying of Boilers 27

HG-345.1(b) Sketch Showing Application of HG-345.1 to the Staying of Boilers 28

HG-350.1 Example of Tube Spacing With Pitch of Holes Equal in Every Row 29

HG-350.2 Example of Tube Spacing With Pitch of Holes Unequal in Every Second Row 29

HG-350.3 Example of Tube Spacing With Pitch of Holes Varying in Every Second and Third Row -- 30

HG-350.4 Example of Tube Spacing With Tube Holes on Diagonal Lines 30

HG-402 Official Certification Mark to Denote the American Society of Mechanical Engineers' Standard 35

HG-530.1 Official Certification Mark to Denote the American Society of Mechanical Engineers' Standard 44

HG-530.2 Steam and Water Boilers Form of Marking on Completed Boilers or Their Nameplates … 45

HG-530.3 Boilers Suitable for Water Only 46

HG-530.4 Steam and Water Boilers 46

HG-530.5 Boilers Suitable for Water Only 47

HG-530.6 Boilers Suitable for Water Only 47

HG-530.7 Steam and Water Boilers 47

HG-530.8 Boilers Suitable for Water Only 48

HG-703.1(a) Steam Boilers in Battery - Pumped Return - Acceptable Piping Installation 57

HG-703.1(b) Steam Boilers in Battery - Gravity Return - Acceptable Piping Installation 58

HG-703.2 Hot Water Boilers in Battery - Acceptable Piping Installation 59

HG-725(a) Spacing and Weld Details for Supporting Lugs in Pairs on Horizontal-Return Tubular Boiler 63

HG-725(b) Welded Bracket Connection for Horizontal-Return Tubular Boiler 64

HW-701.1 Butt Welding of Plates of Unequal Thickness 99

HW-701.3 Some Forms of Attachments of Pressure Parts to Flat Plates to Form a Corner Joint (Tee Joint) 101

HW-710.4(a) Some Acceptable Types of Diagonal Stays for Installation by Welding 102

HW-710.4(b) Unacceptable Types of Diagonal Stays for Installation by Welding 102

HW-715.1 Heads Attached to Shells 104

HW-731 Some Acceptable Types of Welds for Fittings, Nozzles, and Other Connections to Shells, Drums, and Headers 106

HW-740 Three-Ply Joint Assemblies 109

HW-745 Two-Ply Joint Assemblies 111

HC-204.1 Dimensions of Tensile Test Specimen 126

HC-205.1 Cast Test Bars 126

HC-311 Spherically Shaped Covers With Bolting Flanges 131

HLW-401.1 Butt Welding of Plates of Unequal Thickness 162

HLW-401.2 Typical Corner Joints 163

HLW-411 Typical Water Heater Welded Joints 165

HLW-413 Tubes Attached by Welding 167

HLW-415 Heads Attached to Shells 168

HLW-431.1 Some Acceptable Types of Welds for Fittings, Nozzles, and Other Connections to Shells and Head 170

HLW-431.5 Some Acceptable Types of Welds for Fittings, Nozzles, and Other Connections to Shells and Head 171

HLW-432.1 Some Acceptable Types of Brazed Fittings, Nozzles, and Other Connections to Copper-Lined Shells and Heads 173

HLW-602.1 Official Symbol to Denote The American Society of Mechanical Engineers' Standard 180

HLW-602.2 Form of Stamping on Completed Water Heaters 180

HLW-809.1 A Typical Acceptable Piping Installation for Storage Water Heaters in Battery 185

HLW-809.2 A Typical Acceptable Piping Installation for Flow Through Water Heater With Provisions for Piping Expansion 186

D-100 Computation of Typical Pad Reinforcement 233

D-101 Computation of a Typical Nozzle Fitting 234

K-1 Sample Certificate of Authorization 245

TABLES

HG-321 Values of Spherical Radius Factor K1 16

HG-340 Allowable Pitch of Stays, in. (mm) (Limited by HG-340.3) 24

HG-360 Permitted O-Ring Materials 31

HG-370 Minimum Thickness of Material for Threaded Connections to Boilers 31

HG-709.2 Expansion Tank Capacities for Forced Hot Water Systems 61

HG-715 Size of Bottom Blowoff Piping, Valves, and Cocks 62

HF-300.1 Maximum Allowable Stress Values for Ferrous Materials, ksi 71

HF-300.1M Maximum Allowable Stress Values for Ferrous Materials, MPa 78

HF-300.2 Maximum Allowable Stress Values for Nonferrous Materials, ksi 86

HF-300.2M Maximum Allowable Stress Values for Nonferrous Materials, MPa 91

HW-713 Firetube Extension Through Tubesheets for Welded Construction 104

HB-1305 Recommended Joint Clearances at Brazing Temperature 121

HC-212 Correction Factors for Transverse Test Bars 128

HC-214 Pipe Plug Size for Minimum Wall Thickness 128

HC-300 Maximum Allowable Stress Values in Tension for Cast Iron, ksi (MPa) 130

HLW-300 Maximum Allowable Stress Values in Tension for Lined Water Heater Materials, ksi (MPa) 156

HLW-301 Maximum Allowable Stress Values in Tension for Unlined Water Heater Materials, ksi (MPa) 158

HLW-401.3-1 Alignment Tolerance 163

HLW-809.1 Expansion Tank Capacities for a Water Heater 184

2-100 Codes, Standards, and Specifications Referenced in Text 187

4-1 Guide for the Preparation of Section IV Manufacturer's Data Report Forms 192

6-1 Standard Units for Use in Equations 219

8-200-1 Guide for Completing the Certificate of Conformance for Reapplication of the Certification Mark 224

A-100 Guide for Estimating Steaming Capacity Based on Heating Surface 228

N-1 Guide for the Preparation of Section IV Manufacturer's Certificate of Conformance Form HV-1 250

FORMS

H-2 Manufacturer's Data Report for All Types of Boilers Except Watertube and Those Made of Cast Iron 195

H-3 Manufacturer's Data Report for Watertube Boilers 197

H-4 Manufacturer's Partial Data Report 199

H-5 Manufacturer's Master Data Report for Boilers Constructed from Cast Iron 201

H-5A Manufacturer's Master Data Report for Boilers Constructed from Cast Aluminum 203

H-6 Manufacturer's Data Report Supplementary Sheet 205

HC-1 Manufacturer's Material Certificate of Conformance for Cast Iron Boiler Sections 206

HC-2 Manufacturer's Material Certificate of Conformance for Hydrostatic Testing of Cast Iron Boiler Sections 207

HC-3 Manufacturer's Report for the Application of Nameplates on Cast Iron Boilers 208

HA-1 Manufacturer's Material Certificate of Conformance for Cast Aluminum Boiler Sections 209

HA-2 Manufacturer's Material Certificate of Conformance for Hydrostatic Testing of Cast Aluminum Boiler Sections 210

HA-3 Manufacturer's Report for the Application of Nameplates on Cast Aluminum Boilers 211

HLW-6 Manufacturer's Data Report for Water Heaters or Storage Tanks 212

HLW-7 Manufacturer's Partial Data Report for Water Heaters and Storage Tanks 214

HLW-8 Manufacturer's Master Data Proof Test Report for Water Heaters or Storage Tanks 216

8-1 Certificate of Conformance for Reapplication of the Certification Mark 223

HV-1 Manufacturer's Certificate of Conformance for Pressure Relief Valves 251

ENDNOTES 253

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