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ASME PVHO-2-2025 Safety Standard for Pressure Vessels for Human Occupancy: Post-Construction Requirements, 2025
- CONTENTS
- FOREWORD
- ASME PRESSURE VESSELS FOR HUMAN OCCUPANCY COMMITTEE ROSTER
- CORRESPONDENCE WITH THE PVHO COMMITTEE
- ASME PVHO-2–2025 SUMMARY OF CHANGES
- Section 1 General [Go to Page]
- 1-1 INTRODUCTION AND SCOPE
- 1-2 RESPONSIBILITIES AND JURISDICTIONAL CONSIDERATIONS [Go to Page]
- 1-2.1 User’s Responsibilities
- 1-2.2 Jurisdictional Considerations
- 1-3 IN-SERVICE EVALUATIONS, REPAIRS, AND MODIFICATION OF PVHOs [Go to Page]
- 1-3.1 In-Service PVHO Evaluation and Testing
- 1-3.2 PVHO Windows and Viewports
- 1-3.3 Pressure Boundary (Except for Windows)
- 1-3.4 Pressure Gauge Calibration Verification
- 1-4 PVHO AND PVHO SYSTEMS DOCUMENTATION
- 1-5 OWNER’S MANUAL [Go to Page]
- 1-5.1 General
- 1-5.2 Component Description
- 1-5.3 Storage of Equipment
- 1-6 MAINTENANCE REQUIREMENTS [Go to Page]
- 1-6.1 General
- 1-7 CHECKLISTS AND LOGS [Go to Page]
- 1-7.1 Checklists
- 1-7.2 Operating Logs
- 1-7.3 Maintenance Logs
- Tables [Go to Page]
- Table IV-1-1 Specified Values of Physical Properties for Spot Casting Repairs (To Be Verified by Testing of Specimens Taken From Test Castings of the Same Slurry Batch Used in Repair)
- Table IV-1-2(a) Annealing Schedule for Acrylic Windows — Minimum Heating Times for Elevated Temperature Annealing of Acrylic
- Table IV-1-2(b) Annealing Schedule for Acrylic Windows — Maximum Cooling Rates for Acrylic Subjected to Elevated Annealing Temperatures
- Table VI-6-1 Example Evaluation
- Forms [Go to Page]
- Form IV-1-1 Material Testing Certification for Repair by Spot Casting
- Form IV-1-2 Annealing Process Certification
- Form IV-5-1 Pressure Testing Certification
- Form VI-1 Material Testing Results for Continued Service
- Form VI-2 Material Testing Evaluation for Continued Service
- MANDATORY APPENDICES [Go to Page]
- MANDATORY APPENDIX I DEFINITIONS
- MANDATORY APPENDIX II REFERENCE STANDARDS AND SPECIFICATIONS
- MANDATORY APPENDIX III QUALITY ASSURANCE PROGRAM FOR REPAIR OF SEVERELY DAMAGED WINDOWS [Go to Page]
- III-1 GENERAL
- III-2 ORGANIZATION
- III-3 QUALITY ASSURANCE PROGRAM
- III-4 QUALITY ASSURANCE MANUAL
- III-5 DRAWING, DESIGN, AND SPECIFICATION CONTROL
- III-6 PROCUREMENT CONTROL
- III-7 IDENTIFICATION AND CONTROL OF ITEMS
- III-8 CONTROL OF PROCESSES
- III-9 INSPECTION
- III-10 TEST CONTROL
- III-11 HANDLING, STORAGE, AND SHIPPING
- III-12 DOCUMENTATION AND STATUS OF TEST ACTIVITIES
- III-13 CORRECTIVE ACTION
- III-14 QUALITY ASSURANCE RECORDS
- III-15 QUALITY ASSURANCE AUDITS
- III-16 CONFORMITY
- MANDATORY APPENDIX IV ADDITIONAL WINDOW REPAIR REQUIREMENTS AND FORMS [Go to Page]
- IV-1 WINDOW REPAIR TEST REQUIREMENTS
- IV-2 POST-REPAIR PRESSURE TESTING REQUIREMENT
- IV-3 TEST REJECTION CRITERIA
- IV-4 ALTERNATIVE TEST
- IV-5 TEST CERTIFICATION FORM
- MANDATORY APPENDIX V PARTIAL LIST OF HARMFUL SUBSTANCES ANDACCEPTABLE PRODUCTS [Go to Page]
- V-1 SCOPE
- V-2 HARMFUL SUBSTANCES
- V-3 ACCEPTABLE CLEANERS, BIOCIDES, AND POLISHES
- V-4 ACCEPTABLE LUBRICANTS
- V-5 ACCEPTABLE SEAL AND GASKET ADHESIVES
- MANDATORY APPENDIX VI MECHANICAL TESTING COMPUTATIONS AND FORMS [Go to Page]
- VI-1 STANDARD DEVIATION
- VI-2 STANDARD ERROR
- VI-3 CONFIDENCE INTERVAL (CI)
- VI-4 CRITERIA FOR CENSORING OF SUSPECT DATA
- VI-5 COMPUTATIONAL EXAMPLES
- VI-6 EVALUATION
- NONMANDATORY APPENDICES [Go to Page]
- NONMANDATORY APPENDIX A CHECKLISTS AND LOGS FOR PVHO OPERATION
- NONMANDATORY APPENDIX B OPERATION OF SUBMERSIBLE CRAFT [Go to Page]
- B-1 GENERAL
- B-2 CHAIN OF COMMAND
- B-3 OPERATION, PREPARATION, AND PLANNING
- B-4 SUBMERSIBLE CRAFT PILOT
- B-5 QUALIFIED PERSONNEL
- B-6 CERTIFICATE OF COMPETENCE [Go to Page]
