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I Rules for Construction of Power Boilers II Materials Part A — Ferrous Material Specifications Part B — Nonferrous Material Specifications Part C — Specifications for Welding Rods, Electrodes, and Filler Metals Part D — Properties (Customary) Part D — Properties (Metric) III Rules for Construction of Nuclear Facility Components Subsection NCA — General Requirements for Division 1 and Division 2 Division 1 Subsection NB — Class 1 Components Subsection NC — Class 2 Components Subsection ND — Class 3 Components Subsection NE — Class MC Components Subsection NF — Supports Subsection NG — Core Support Structures Subsection NH — Class 1 Components in Elevated Temperature Service Appendices Division 2 — Code for Concrete Containments Division 3 — Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste IV Rules for Construction of Heating Boilers V Nondestructive Examination VI Recommended Rules for the Care and Operation of Heating Boilers VII Recommended Guidelines for the Care of Power Boilers VIII Rules for Construction of Pressure Vessels Division 1 Division 2 — Alternative Rules Division 3 — Alternative Rules for Construction of High Pressure Vessels IX Welding and Brazing Qualifications X Fiber-Reinforced Plastic Pressure Vessels XI Rules for Inservice Inspection of Nuclear Power Plant Components XII Rules for Construction and Continued Service of Transport Tanks
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Colored-sheet Addenda, which include additions and revisions to individual Sections of the Code, are published annually and will be sent automatically to purchasers of the applicable Sections up to the publication of the 2010 Code. The 2007 Code is available only in the loose-leaf format; accordingly, the Addenda will be issued in the loose-leaf, replacement-page format.
ASME issues written replies to inquiries concerning interpretation of technical aspects of the Code. The Inter- pretations for each individual Section will be published separately and will be included as part of the update service to that Section. Interpretations of Section III, Divisions 1 and 2, will be included with the update service to Subsec- tion NCA.
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Interpretations of the Code are distributed annually in July with the issuance of the edition and subse- quent addenda. Interpretations posted in January at www.cstools.asme.org/interpretations are included in the July distribution.
The Boiler and Pressure Vessel Committee meets regu- larly to consider proposed additions and revisions to the Code and to formulate Cases to clarify the intent of existing requirements or provide, when the need is urgent, rules for materials or constructions not covered by existing Code rules. Those Cases that have been adopted will appear in the appropriate 2007 Code Cases book: “Boilers and Pressure Vessels” and “Nuclear Components.” Supple- ments will be sent automatically to the purchasers of the Code Cases books up to the publication of the 2010 Code.
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UG-100 Pneumatic Test (See UW-50)............................................. 75 UG-101 Proof Tests to Establish Maximum Allowable Working Pressure............. 75 UG-102 Test Gages............................................................. 80 UG-103 Nondestructive Testing.................................................. 80
Marking and Reports UG-115 General................................................................ 81 UG-116 Required Marking....................................................... 81 UG-117 Certificates of Authorization and Code Symbol Stamps..................... 82 UG-118 Methods of Marking..................................................... 85 UG-119 Nameplates............................................................. 85 UG-120 Data Reports........................................................... 86
Pressure Relief Devices UG-125 General................................................................ 87 UG-126 Pressure Relief Valves................................................... 88 UG-127 Nonreclosing Pressure Relief Devices..................................... 88 UG-128 Liquid Pressure Relief Valves............................................ 91 UG-129 Marking................................................................ 91 UG-130 Code Symbol Stamp..................................................... 92 UG-131 Certification of Capacity of Pressure Relief Devices........................ 92 UG-132 Certification of Capacity of Pressure Relief Valves in Combination With Nonreclosing Pressure Relief Devices................................... 96 UG-133 Determination of Pressure Relieving Requirements......................... 97 UG-134 Pressure Settings and Performance Requirements........................... 97 UG-135 Installation............................................................. 98 UG-136 Minimum Requirements for Pressure Relief Valves......................... 98 UG-137 Minimum Requirements for Rupture Disk Devices......................... 102
Figures UG-28 Diagrammatic Representation of Variables for Design of Cylindrical Vessels Subjected to External Pressure.................................. 20 UG-28.1 Diagrammatic Representation of Lines of Support for Design of Cylindrical Vessels Subjected to External Pressure....................... 21 UG-29.1 Various Arrangements of Stiffening Rings for Cylindrical Vessels Subjected to External Pressure......................................... 25 UG-29.2 Maximum Arc of Shell Left Unsupported Because of Gap in Stiffening Ring of Cylindrical Shell Under External Pressure....................... 26 UG-30 Some Acceptable Methods of Attaching Stiffening Rings................... 28 UG-33.1 Length L of Some Typical Conical Sections for External Pressure........... 32 UG-34 Some Acceptable Types of Unstayed Flat Heads and Covers................ 34 UG-36 Large Head Openings — Reverse-Curve and Conical Shell-Reducer Sections.............................................................. 39 UG-37 Chart for Determining Value of F , as Required in UG-37................... 41 UG-37.1 Nomenclature and Formulas for Reinforced Openings...................... 42 UG-38 Minimum Depth for Flange of Flued-In Openings.......................... 44 UG-39 Multiple Openings in Rim of Heads With a Large Central Opening.......... 46 UG-40 Some Representative Configurations Describing the Reinforcement Dimension te and the Opening Dimension d............................. 47 UG-41.1 Nozzle Attachment Weld Loads and Weld Strength Paths to Be Considered........................................................... 50 UG-42 Examples of Multiple Openings.......................................... 52 UG-47 Acceptable Proportions for Ends of Stays.................................. 55 UG-53.1 Example of Tube Spacing With Pitch of Holes Equal in Every Row......... 57
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Figures
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UW-13.3 Typical Pressure Parts With Butt Welded Hubs............................ 118 UW-13.4 Nozzle Necks Attached to Piping of Lesser Wall Thickness................. 119 UW-13.5 Fabricated Lap Joint Stub Ends for Lethal Service.......................... 119 UW-16.1 Some Acceptable Types of Welded Nozzles and Other Connections to Shells, Heads, etc............................................................ 121 UW-16.2 Some Acceptable Types of Small Standard Fittings......................... 127 UW-19.1 Typical Forms of Welded Staybolts....................................... 130 UW-19.2 Use of Plug and Slot Welds for Staying Plates............................. 130 UW-20.1 Some Acceptable Types of Tube-to-Tubesheet Strength Welds.............. 132 UW-21 Welds of Socket Weld Flanges to Nozzle Necks........................... 133
Tables UW-12 Maximum Allowable Joint Efficiencies for Arc and Gas Welded Joints....... 111 UW-33....................................................................... 136
Part UF Requirements for Pressure Vessels Fabricated by Forging............... 143
General UF-1 Scope.................................................................. 143
Materials UF-5 General................................................................ 143 UF-6 Forgings............................................................... 143 UF-7 Forged Steel Rolls Used for Corrugating Paper Machinery.................. 143
Design UF-12 General................................................................ 143 UF-13 Head Design............................................................ 144 UF-25 Corrosion Allowance.................................................... 144
Fabrication UF-26 General................................................................ 144 UF-27 Tolerances on Body Forgings............................................ 144 UF-28 Methods of Forming Forged Heads....................................... 144 UF-29 Tolerance on Forged Heads.............................................. 144 UF-30 Localized Thin Areas.................................................... 145 UF-31 Heat Treatment......................................................... 145 UF-32 Welding for Fabrication................................................. 145 UF-37 Repair of Defects in Material............................................. 146 UF-38 Repair of Weld Defects.................................................. 147 UF-43 Attachment of Threaded Nozzles to Integrally Forged Necks and Thickened Heads on Vessels........................................... 147
Inspection and Tests UF-45 General................................................................ 147 UF-46 Acceptance by Inspector................................................. 147 UF-47 Parts Forging........................................................... 147 UF-52 Check of Heat Treatment and Postweld Heat Treatment..................... 147 UF-53 Test Specimens......................................................... 148 UF-54 Tests and Retests........................................................ 148 UF-55 Ultrasonic Examination.................................................. 148
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UB-50 Exemptions............................................................. 155
Marking and Reports UB-55 General................................................................ 155
Pressure Relief Devices UB-60 General................................................................ 155
Figures UB-14 Examples of Filler Metal Application..................................... 151 UB-16 Some Acceptable Types of Brazed Joints.................................. 152
Tables UB-2 Maximum Design Temperatures for Brazing Filler Metal................... 150 UB-17 Recommended Joint Clearances at Brazing Temperature.................... 152
Part UCS Requirements for Pressure Vessels Constructed of Carbon and Low Alloy Steels.......................................................... 156
General UCS-1 Scope.................................................................. 156
Materials UCS-5 General................................................................ 156 UCS-6 Steel Plates............................................................. 157 UCS-7 Steel Forgings.......................................................... 157 UCS-8 Steel Castings.......................................................... 157 UCS-9 Steel Pipe and Tubes.................................................... 157 UCS-10 Bolt Materials.......................................................... 157 UCS-11 Nuts and Washers....................................................... 157 UCS-12 Bars and Shapes........................................................ 157
Design UCS-16 General................................................................ 159 UCS-19 Welded Joints.......................................................... 159 UCS-23 Maximum Allowable Stress Values....................................... 159 UCS-27 Shells Made From Pipe.................................................. 159 UCS-28 Thickness of Shells Under External Pressure............................... 159 UCS-29 Stiffening Rings for Shells Under External Pressure........................ 159 UCS-30 Attachment of Stiffening Rings to Shell................................... 159 UCS-33 Formed Heads, Pressure on Convex Side.................................. 159 UCS-56 Requirements for Postweld Heat Treatment................................ 159 UCS-57 Radiographic Examination............................................... 169
Low Temperature Operation UCS-65 Scope.................................................................. 169 UCS-66 Materials............................................................... 170 UCS-67 Impact Tests of Welding Procedures...................................... 175 UCS-68 Design................................................................. 181
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Fabrication UCS-75 General................................................................ 185 UCS-79 Forming Shell Sections and Heads........................................ 185 UCS-85 Heat Treatment of Test Specimens........................................ 185
Inspection and Tests UCS-90 General................................................................ 186
Marking and Reports UCS-115 General................................................................ 186
Pressure Relief Devices UCS-125 General................................................................ 186
Nonmandatory Appendix CS UCS-150 General................................................................ 186 UCS-151 Creep-Rupture Properties of Carbon Steels................................ 186 UCS-160 Vessels Operating at Temperatures Colder Than the MDMT Stamped on the Nameplate........................................................... 186
Figures UCS-66 Impact Test Exemption Curves........................................... 171 UCS-66M Impact Test Exemption Curves........................................... 174 UCS-66.1 Reduction in Minimum Design Metal Temperature Without Impact Testing.............................................................. 178 UCS-66.1M Reduction in Minimum Design Metal Temperature Without Impact Testing.............................................................. 179 UCS-66.2 Diagram of UCS-66 Rules for Determining Lowest Minimum Design Metal Temperature (MDMT) Without Impact Testing.................... 180 UCS-66.3 Some Typical Vessel Details Showing the Governing Thicknesses as Defined in UCS-66.................................................... 182
Tables UCS-23 Carbon and Low Alloy Steel............................................. 158 UCS-56 Postweld Heat Treatment Requirements for Carbon and Low Alloy Steels.... 161 UCS-56.1 Alternative Postweld Heat Treatment Requirements for Carbon and Low Alloy Steels.......................................................... 169 UCS-57 Thickness Above Which Full Radiographic Examination of Butt Welded Joints Is Mandatory................................................... 169 UCS-66 Tabular Values for Fig. UCS-66 and Fig. UCS-66M........................ 176
Part UNF Requirements for Pressure Vessels Constructed of Nonferrous Materials............................................................ 187 General UNF-1 Scope.................................................................. 187 UNF-3 Uses................................................................... 187 UNF-4 Conditions of Service.................................................... 187
Materials UNF-5 General................................................................ 187 UNF-6 Nonferrous Plate........................................................ 187 UNF-7 Forgings............................................................... 187
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Figure UNF-79 Illustration of Cold Forming Operations for Flaring, Swaging, and Upsetting of Tubing............................................................ 196
Tables UNF-23.1 Nonferrous Metals — Aluminum and Aluminum Alloy Products............ 189 UNF-23.2 Nonferrous Metals — Copper and Copper Alloys.......................... 189 UNF-23.3 Nonferrous Metals — Nickel, Cobalt, and High Nickel Alloys............... 190 UNF-23.4 Nonferrous Metals — Titanium and Titanium Alloys....................... 191 UNF-23.5 Nonferrous Metals — Zirconium......................................... 192 UNF-79 Postfabrication Strain Limits and Required Heat Treatment.................. 195
Part UHA Requirements for Pressure Vessels Constructed of High Alloy Steel...... 199
General UHA-1 Scope.................................................................. 199 UHA-5 Uses................................................................... 199 UHA-6 Conditions of Service.................................................... 199 UHA-8 Material................................................................ 199
Materials UHA-11 General................................................................ 199 UHA-12 Bolt Materials.......................................................... 199 UHA-13 Nuts and Washers....................................................... 202
Design UHA-20 General................................................................ 202 UHA-21 Welded Joints.......................................................... 202 UHA-23 Maximum Allowable Stress Values....................................... 202 UHA-28 Thickness of Shells Under External Pressure............................... 202 UHA-29 Stiffening Rings for Shells Under External Pressure........................ 202 UHA-30 Attachment of Stiffening Rings to Shell................................... 202 UHA-31 Formed Heads, Pressure on Convex Side.................................. 203 UHA-32 Requirements for Postweld Heat Treatment................................ 203 UHA-33 Radiographic Examination............................................... 203 UHA-34 Liquid Penetrant Examination............................................ 203
Fabrication UHA-40 General................................................................ 203 UHA-42 Weld Metal Composition................................................ 203 UHA-44 Requirements for Postfabrication Heat Treatment Due to Straining........... 206
Inspection and Tests UHA-50 General................................................................ 207 UHA-51 Impact Tests............................................................ 207 UHA-52 Welded Test Plates...................................................... 211
Marking and Reports UHA-60 General................................................................ 211
Pressure Relief Devices UHA-65 General................................................................ 211
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Appendix HA Suggestions on the Selection and Treatment of Austenitic Chromium– Nickel and Ferritic and Martensitic High Chromium Steels (Informative and Nonmandatory)..................................... 211 UHA-100 General................................................................ 211 UHA-101 Structure............................................................... 211 UHA-102 Intergranular Corrosion.................................................. 211 UHA-103 Stress Corrosion Cracking............................................... 211 UHA-104 Sigma Phase Embrittlement.............................................. 211 UHA-105 Heat Treatment of Austenitic Chromium-Nickel Steels...................... 211 UHA-107 Dissimilar Weld Metal................................................... 211 UHA-108 Fabrication............................................................. 211 UHA-109 885°F (475°C) Embrittlement............................................ 212
Figure UHA-44 Illustration of Cold Forming Operations for Flaring, Swaging, and Upsetting of Tubing............................................................ 209
Tables UHA-23 High Alloy Steel........................................................ 200 UHA-32 Postweld Heat Treatment Requirements for High Alloy Steels............... 204 UHA-44 Postfabrication Strain Limits and Required Heat Treatment.................. 208
Part UCI Requirements for Pressure Vessels Constructed of Cast Iron............. 213
General UCI-1 Scope.................................................................. 213 UCI-2 Service Restrictions..................................................... 213 UCI-3 Pressure–Temperature Limitations........................................ 213
Materials UCI-5 General................................................................ 213 UCI-12 Bolt Materials.......................................................... 213
Design UCI-16 General................................................................ 213 UCI-23 Maximum Allowable Stress Values....................................... 214 UCI-28 Thickness of Shells Under External Pressure............................... 214 UCI-29 Dual Metal Cylinders.................................................... 214 UCI-32 Heads With Pressure on Concave Side.................................... 214 UCI-33 Heads With Pressure on Convex Side..................................... 215 UCI-35 Spherically Shaped Covers (Heads)....................................... 215 UCI-36 Openings and Reinforcements............................................ 215 UCI-37 Corners and Fillets...................................................... 215
Fabrication UCI-75 General................................................................ 215 UCI-78 Repairs in Cast Iron Materials............................................ 215
Inspection and Tests UCI-90 General................................................................ 216 UCI-99 Standard Hydrostatic Test................................................ 216 UCI-101 Hydrostatic Test to Destruction........................................... 216
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Pressure Relief Devices UCL-60 General................................................................ 222
Part UCD Requirements for Pressure Vessels Constructed of Cast Ductile Iron..... 223
General UCD-1 Scope.................................................................. 223 UCD-2 Service Restrictions..................................................... 223 UCD-3 Pressure–Temperature Limitations........................................ 223
Materials UCD-5 General................................................................ 223 UCD-12 Bolt Materials.......................................................... 223
Design UCD-16 General................................................................ 223 UCD-23 Maximum Allowable Stress Values....................................... 224 UCD-28 Thickness of Shells Under External Pressure............................... 224 UCD-32 Heads With Pressure on Concave Side.................................... 224 UCD-33 Heads With Pressure on Convex Side..................................... 224 UCD-35 Spherically Shaped Covers (Heads)....................................... 224 UCD-36 Openings and Reinforcements............................................ 224 UCD-37 Corners and Fillets...................................................... 224
Fabrication UCD-75 General................................................................ 225 UCD-78 Repairs in Cast Ductile Iron Material..................................... 225
Inspection and Tests UCD-90 General................................................................ 226 UCD-99 Standard Hydrostatic Test................................................ 226 UCD-101 Hydrostatic Test to Destruction........................................... 226
Marking and Reports UCD-115 General................................................................ 226
Pressure Relief Devices UCD-125 General................................................................ 226
Tables UCD-23 Maximum Allowable Stress Values in Tension for Cast Ductile Iron, ksi (MPa)............................................................ 224 UCD-78.1....................................................................... 225 UCD-78.2....................................................................... 225
Part UHT Requirements for Pressure Vessels Constructed of Ferritic Steels With Tensile Properties Enhanced by Heat Treatment................. 227
General UHT-1 Scope.................................................................. 227
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Materials UHT-5 General................................................................ 227 UHT-6 Test Requirements...................................................... 227
Design UHT-16 General................................................................ 228 UHT-17 Welded Joints.......................................................... 228 UHT-18 Nozzles................................................................ 229 UHT-19 Conical Sections........................................................ 229 UHT-20 Joint Alignment......................................................... 229 UHT-23 Maximum Allowable Stress Values....................................... 229 UHT-25 Corrosion Allowance.................................................... 232 UHT-27 Thickness of Shells Under External Pressure............................... 232 UHT-28 Structural Attachments and Stiffening Rings............................... 232 UHT-29 Stiffening Rings for Shells Under External Pressure........................ 232 UHT-30 Attachment of Stiffening Rings to Shells.................................. 232 UHT-32 Formed Heads, Pressure on Concave Side................................. 232 UHT-33 Formed Heads, Pressure on Convex Side.................................. 232 UHT-34 Hemispherical Heads.................................................... 233 UHT-40 Materials Having Different Coefficients of Expansion....................... 233 UHT-56 Postweld Heat Treatment................................................ 233 UHT-57 Examination............................................................ 233
Fabrication UHT-75 General................................................................ 235 UHT-79 Forming Shell Sections and Heads........................................ 235 UHT-80 Heat Treatment......................................................... 235 UHT-81 Heat Treatment Verification Tests........................................ 235 UHT-82 Welding................................................................ 236 UHT-83 Methods of Metal Removal.............................................. 237 UHT-84 Weld Finish............................................................ 237 UHT-85 Structural and Temporary Welds.......................................... 237 UHT-86 Marking on Plates and Other Materials.................................... 237
Inspection and Tests UHT-90 General................................................................ 237
Marking and Reports UHT-115 General................................................................ 237
Pressure Relief Devices UHT-125 General................................................................ 238
Figures UHT-6.1 Charpy V-Notch Impact Test Requirements................................ 228 UHT-6.1M Charpy V-Notch Impact Test Requirements................................ 228 UHT-18.1 Acceptable Welded Nozzle Attachment Readily Radiographed to Code Standards............................................................ 230 UHT-18.2 Acceptable Full Penetration Welded Nozzle Attachments Radiographable With Difficulty and Generally Requiring Special Techniques Including Multiple Exposures to Take Care of Thickness Variations................. 231
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