This Standard provides requirements for heat treatment of piping and pipelines that meet the requirements of the ASME B31 Code Sections. These requirements apply to preheating; postweld heat treatment (PWHT); postforming heat treatment (PFHT) required by the ASME B31 Code Sections for other fabricated assemblies, including forming operations such as bending; heat treatments required by contract documents<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | ASME B31 COMMITTEE ROSTER <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | CORRESPONDENCE WITH THE B31 COMMITTEE <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | ASME B31P-2023 SUMMARY OF CHANGES <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 INTRODUCTION 1.1 Scope 1.2 General 1.3 Exclusions 1.4 Units of Measure 2 GLOSSARY <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3 TEMPERATURE MEASUREMENT 3.1 Measurement Method 3.2 Attachment of Thermocouples 4 TEMPERATURE CONTROL 4.1 Control of Heat Treatment Temperature <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4.2 Heating and Cooling Rates 5 WELDING PREHEAT 5.1 Temperature 5.2 Different P-Number Materials 5.3 Interruption of Welding Preheat <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6 POSTWELD HEAT TREATMENT (PWHT) 6.1 Minimum PWHT Requirements Tables Table 5.1-1 Preheat Temperature <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Table 6.1.1-1 Postweld Heat Treatment Table 6.1.1-2 Alternate Postweld Heat Treatment Requirements for Carbon and Low-Alloy Steels, P-Nos. 1 and 3 <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Table 6.1.1-3 Exemptions to Mandatory Postweld Heat Treatment <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6.2 Mandatory PWHT Requirements 6.3 Exemptions to Mandatory PWHT Requirements 6.4 Definition of Thicknesses Governing PWHT Table 6.2-1 Approximate Lower Transformation Temperatures <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 7 POSTFORMING AND MATERIAL HEAT TREATMENTS 7.1 PFHT 7.2 Material Heat Treatment 8 ALTERNATIVES AND EXEMPTIONS TO PREHEAT AND PWHT REQUIREMENTS <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | NONMANDATORY APPENDICES NONMANDATORY APPENDIX A RECOMMENDATIONS FOR THE PROPER USE OF THERMOCOUPLES A-1 THERMOCOUPLE TYPES AND USAGE A-2 PERMISSIBLE THERMOCOUPLE WIRE SIZE A-3 LOCATION A-4 ATTACHMENT A-5 REMOVAL OF THERMOCOUPLES <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Figures Figure B-3.1-1 Definition of Terms for Local Circumferential Band Heating of Pipe Weld NONMANDATORY APPENDIX B RECOMMENDATIONS FOR CONTROL OF NARROW TEMPERATURE RANGE HEAT TREATMENTS: LOCAL HEAT-TREATMENT METHODS B-1 SCOPE B-2 INTRODUCTION B-3 GLOSSARY AND NOMENCLATURE FOR LOCAL HEATING <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure B-3.1-2 Definition of Terms for Local Circumferential Band Heating of Branch Connection to Pipe Attachment Weld <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | B-4 LOCAL CIRCUMFERENTIAL BAND HEATING <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Table B-5.1-1 Requirements for Control Zones B-5 DESIGN OF THE HEATING PROCESS <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Figure B-5.2-1 Location of Thermocouples (Monitoring and Control) for Pipe Sizes Less Than NPS 6 (DN 150) and One Control Zone <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Figure B-5.2-2 Location of Thermocouples (Monitoring and Control) for Pipe Sizes NPS 6 (DN 150) Up to and Including NPS 12 (DN 300) and Two Control Zones <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Figure B-5.2-3 Location of Thermocouples (Monitoring and Control) for Pipe Sizes NPS 14 (DN 350) Up to and Including NPS 30 (DN 750) and Four Control Zones <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Figure B-5.2-4 Location of Monitoring Thermocouples for Branch Nozzle or Attachment Welds <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure B-5.3-1 Example of One Approach When the Heated Band From a Weld Requiring PWHT Intersects a Weld Not Requiring PWHT <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Forms Form B-5.6-1 Standard Procedure for Local Heating <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Form B-5.6-2 Standard Documentation Checklist for Local Heating <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Figure C-1 Typical Branch Attachment Details That May Be Used to Calculate Control Thickness NONMANDATORY APPENDIX C BRANCH CONNECTION EXAMPLES <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure C-2 Typical Integrally Reinforced Outlet Fitting Branch Connection Details That May Be Used to Calculate Control Thickness <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | NONMANDATORY APPENDIX D TEMPER BEAD METHOD ALTERNATIVE TO PWHT D-1 TEMPER BEAD WELDING <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | NONMANDATORY APPENDIX E FRACTURE MECHANICS ALTERNATIVE TO PWHT E-1 FRACTURE MECHANICS EXEMPTION <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" ASME B31P-2023 Standard Heat Treatments for Piping<\/b><\/p>\n |