This Standard provides technical criteria and guidelines for the operation and maintenance of PVHOs and PVHO systems that were designed, constructed, tested and certified in accordance with ASME PVHO-1. (b) This Standard provides technical criteria for the user to establish the serviceability of a PVHO acrylic window under its specific environmental service conditions. Windows in protected environments as well as those in severe environments are addressed. Judicious use of this Standard will allow the user and/or the jurisdictional authority to determine when a PVHO acrylic window requires replacement.

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5	CONTENTS
6	FOREWORD
7	ASME PRESSURE VESSELS FOR HUMAN OCCUPANCY COMMITTEE
9	CORRESPONDENCE WITH THE PVHO COMMITTEE
11	ASME PVHO-2-2012 SUMMARY OF CHANGES
13	SAFETY STANDARD FOR PRESSURE VESSELS FOR HUMAN OCCUPANCY: IN-SERVICE GUIDELINES Section 1 General 1-1 INTRODUCTION AND SCOPE 1-2 RESPONSIBILITIES AND JURISDICTIONAL CONSIDERATIONS 1-2.1 UserÅ’s Responsibilities 1-2.2 Jurisdictional Considerations 1-3 IN-SERVICE EVALUATIONS, REPAIRS, AND MODIFICATION OF PVHOs 1-3.1 PVHO Windows and Viewports 1-3.2 Pressure Boundary Except for Windows
14	1-4 PVHO AND PVHO SYSTEMS DOCUMENTATION 1-5 OWNERÅ’S MANUAL 1-5.1 General 1-5.2 Component Description 1-5.3 Storage of Equipment 1-6 MAINTENANCE REQUIREMENTS 1-6.1 General
16	Section 2 Viewports 2-1 RESPONSIBILITIES 2-1.1 Window DesignerÅ’s Responsibility 2-1.2 Window FabricatorÅ’s Responsibility 2-1.3 Window UserÅ’s Responsibility 2-1.4 Quality Assurance 2-2 FACTORS AFFECTING SERVICE LIFE 2-2.1 General 2-2.2 Physical Abuse Factors 2-2.3 Temperature Abuse Factors 2-2.3.1 Heat Sources. 2-2.3.2 Improper Operation of Lighting Equipment. 2-2.4 Chemical Abuse Factors
17	2-2.5 Radiation Exposure 2-2.6 Cycles as Related to Above Factors 2-2.7 Additional Service Factors 2-3 HANDLING OF PVHO WINDOWS 2-3.1 Cleaning and Polishing 2-3.1.1 Correct Methods. 2-3.1.2 Incorrect Methods. 2-3.2 Window Storage
18	2-4 OPERATIONAL AND MAINTENANCE INSPECTIONS OF PVHO VIEWPORTS 2-4.1 General 2-4.2 Operational Viewport Inspection 2-4.2.1 Operational Viewport Inspection Schedule. 2-4.3 Maintenance Viewport Inspection 2-4.3.1 Maintenance Viewport Inspection Schedule. 2-4.4 Limitations on Service Life
19	2-4.5 Reinstallation of PVHO Windows 2-4.6 Additional Viewport Refurbishment Considerations 2-4.7 Instrumentation and Tools 2-4.8 Documentation and Record Retention 2-4.9 Qualification of Window Inspectors 2-4.9.1 Procedure and Levels of Qualification.
20	2-4.9.2 Use of Third Parties. 2-5 CATEGORIES OF DAMAGE 2-5.1 Superficial Does Not Require Action 2-5.2 Significant Requires Action 2-5.3 Nonrepairable Requires Replacement 2-6 REPAIR OF DAMAGED PVHO WINDOWS 2-6.1 General 2-6.2 Window Damage Assessment 2-6.2.1 Slightly Damaged Windows 2-6.2.1.1 Field Repair of Slightly Damaged Windows.
21	2-6.2.2 Severely Damaged Windows. 2-6.2.3 Repair of Severely Damaged Windows. 2-6.3 Repair Requirements for Spherical Windows 2-6.4 Annealing Severely Damaged Windows 2-6.5 Thickness Check 2-6.6 Nonconformance 2-6.7 Post-Repair Annealing and Pressure Testing
22	2-6.8 Marking of Repaired Windows 2-6.9 Pressure Test of Repaired Windows 2-7 MECHANICAL PROPERTY TESTING 2-7.1 General 2-7.2 Validation of Minimum Acceptable Properties 2-7.3 Evaluation of Data for Additional Years of Service Life
23	2-7.4 Commensurate Extension of Cyclic Service Life 2-7.5 Additional Notes to Subsection 2-7
35	MANDATORY APPENDIX I DEFINITIONS
37	MANDATORY APPENDIX II REFERENCE STANDARDS AND SPECIFICATIONS
38	MANDATORY APPENDIX III QUALITY ASSURANCE PROGRAM FOR REPAIR OF SEVERELY DAMAGED WINDOWS 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
39	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
40	III-15 QUALITY ASSURANCE AUDITS III-16 CONFORMITY
41	MANDATORY APPENDIX IV ADDITIONAL WINDOW REPAIR REQUIREMENTS AND FORMS IV-1 WINDOW REPAIR TEST REQUIREMENTS IV-2 POST-REPAIR PRESSURE TESTING REQUIREMENT
42	IV-3 TEST REJECTION CRITERIA IV-4 ALTERNATIVE TEST IV-5 TEST CERTIFICATION FORM
47	MANDATORY APPENDIX V PARTIAL LIST OF HARMFUL SUBSTANCES AND ACCEPTABLE PRODUCTS V-1 SCOPE V-2 HARMFUL SUBSTANCES V-3 ACCEPTABLE CLEANERS, BIOCIDES, AND POLISHES V-3.1 Acceptable Cleaners
48	V-3.2 Acceptable Biocides V-3.3 Acceptable Polishes V-4 ACCEPTABLE LUBRICANTS V-5 ACCEPTABLE SEAL AND GASKET ADHESIVES
49	MANDATORY APPENDIX VI MECHANICAL TESTING COMPUTATIONS AND FORMS 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
53	ASME PVHO-2 CASES
57	How can you reach us? ItÅ’s easier than ever!

Published By	Publication Date	Number of Pages
ASME	2012	60


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Standard Title	ASME PVHO-2 Safety Standard for Pressure Vessels for Human Occupancy: In-Service Guidelines
Published Code	ASME
Publication Date	2012
Pages Count	60

ASME PVHO 2 2012

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