This Standard provides requirements for the design, fabrication, inspection, testing, marking, and stamping of pressure vessels for human occupancy, having an internal or external pressure differential exceeding 2 psi. This Standard also provides requirements for the design, fabrication, inspection, testing, cleaning, and certification of piping systems for PVHOs. A PVHO is a pressure vessel that encloses a human being within its pressure boundary while it is under internal or external pressure that exceeds a 2 psi differential pressure. PVHOs include, but are not limited to, submersibles, diving bells, personnel transfer capsules, decompression chambers, recompression chambers, hyperbaric chambers, high altitude chambers, and medical hyperbaric oxygenation facilities. This does not include nuclear reactor containments, pressurized airplane and aerospace vehicle cabins, and caissons.

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5	CONTENTS
9	FOREWORD
10	COMMITTEE ROSTER
12	CORRESPONDENCE WITH THE PVHO COMMITTEE
14	ASME PVHO- 1– 2012 SUMMARY OF CHANGES
15	Section 1 General Requirements 1- 1 INTRODUCTION 1- 2 SCOPE 1- 3 EXCLUSIONS 1- 4 USER REQUIREMENTS 1- 5 MANUFACTURER’S DATA REPORT
16	1- 6 MATERIALS 1- 7 DESIGN AND FABRICATION REQUIREMENTS
21	Figures Fig. 1-7.13.1-1 Geometry of Cylinders
22	Fig. 1-7.13.1-2 Stiffener Geometry Fig. 1-7.13.1-3 Sections Through Rings
27	1- 8 PRESSURE RELIEF DEVICES 1- 9 MARKING Fig. 1-7.13.5-1 Values of t/Ro and Lc/Ro
28	1- 10 NONMETALLIC MATERIALS AND TOXICITY OFFGAS TESTING Fig. 1-9(b)-1 Form of Nameplate, U.S. Customary Fig. 1-9(b)-2 Form of Nameplate, Metric
29	1- 11 RISK ANALYSIS Tables Table 1-10-1 Conversion Factor, Fp (For PVHO Occupation Exceeding 8 hr)
30	Section 2 Viewports 2- 1 GENERAL 2- 2 DESIGN
32	Fig. 2-2.2.1-1 Standard Window Geometries
33	Fig. 2-2.2.1-2 Standard Window Geometries
34	Fig. 2-2.2.1-3 Standard Window Geometries
35	Fig. 2-2.2.1-4 Standard Window Geometries
36	Table 2- 2.3.1- 1 Conversion Factors for Acrylic Flat Disk Windows
37	Table 2- 2.3.1- 2 Conversion Factors for Acrylic Conical Frustum Windows and Double Beveled Disk Windows Table 2- 2.3.1- 3 Conversion Factors for Acrylic Spherical Sector Windows With Conical Edge, Hyperhemispherical Windows With Conical Edge, and NEMO Type Windows With Conical Edge
38	Table 2- 2.3.1- 4 Conversion Factors for Acrylic Spherical Sector Windows With Square Edge and Hemispherical Windows With Equatorial Flange Table 2- 2.3.1- 5 Conversion Factors for Acrylic Cylindrical Windows
39	Table 2- 2.3.2- 1 Conical Frustum Windows for Design Pressures in Excess of 10,000 psi ( 69 MPa)
40	Fig. 2-2.5.1-1 Short-Term Critical Pressure of Flat Disk Acrylic Windows
41	Fig. 2-2.5.1-2 Short-Term Critical Pressure of Flat Disk Acrylic Windows
42	Fig. 2-2.5.1-3 Short-Term Critical Pressure of Flat Disk Acrylic Windows
43	Fig. 2-2.5.1-4 Short-Term Critical Pressure of Conical Frustum Acrylic Windows
44	Fig. 2-2.5.1-5 Short-Term Critical Pressure of Conical Frustum Acrylic Windows
45	Fig. 2-2.5.1-6 Short-Term Critical Pressure of Spherical Sector Acrylic Windows
46	Fig. 2-2.5.1-7 Short-Term Critical Pressure of Spherical Sector Acrylic Windows
47	Fig. 2-2.5.1-8 Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Internally
48	Fig. 2-2.5.1-9 Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Internally
49	Fig. 2-2.5.1-10 Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Externally
50	Fig. 2-2.5.1-11 Short-Term Elastic Buckling of Cylindrical Acrylic
51	Fig. 2-2.5.1-12 Short-Term Elastic Buckling of Cylindrical Acrylic Windows Between Supports Under ExternalHydrostatic Pressure
52	Fig. 2-2.5.1-13 Short-Term Elastic Buckling of Cylindrical Acrylic Windows Between Supports Under External Hydrostatic Pressure
54	Fig. 2-2.5.1-14 Short-Term Critical Pressure of Hyperhemispherical and NEMO Type Acrylic Windows
55	Fig. 2-2.5.1-15 Short-Term Critical Pressure of Hyperhemispherical and NEMO Type Acrylic Windows
59	Fig. 2-2.10.1-1 Seat Cavity Requirements — Conical Frustum Window, Spherical Sector Window With Conical Edge, and Flat Disk Window
60	Fig. 2-2.10.1-2 Seat Cavity Requirements — Double Beveled Disk Window
61	Fig. 2-2.10.1-3 Seat Cavity Requirements — Spherical Sector Window With Square Edge
62	Fig. 2-2.10.1-4 Seat Cavity Requirements — Hemispherical Window With Equatorial Flange
63	Fig. 2-2.10.1-5 Seat Cavity Requirements — Cylindrical Window
64	Fig. 2-2.10.1-6 Seat Cavity Requirements — Hyperhemispherical Window
65	Fig. 2-2.10.1-7 Seat Cavity Requirements — NEMO Window (Standard Seat)
66	Fig. 2-2.10.1-8 Seat Cavity Requirements — NEMO Window (Seat With Extended Cyclic Fatigue Life)
68	Fig. 2-2.11.10-1 Bevels on Window Edges — Flat Disk Windows, Conical Frustum Windows, Spherical Sector Windows, Hyperhemispheres
69	Fig. 2-2.11.10-2 Bevels on Window Edges — Flanged Hemispherical Window, Spherical Sector Window With Square Edge, External Pressure and Internal Pressure of Cylindrical Windows
73	Fig. 2-2.14.11-1 Dimensional Tolerances for Penetrations in Acrylic Windows
75	Table 2- 2.14.13- 1 Specified Values of Physical Properties for Polycarbonate Plastic Table 2- 2.14.13- 2 Specified Values of Physical Properties for Cast Nylon Plastic
76	Fig. 2-2.14.15-1 Dimensional Tolerances for Inserts in Acrylic Windows
77	Fig. 2-2.14.16-1 Typical Shapes of Inserts
78	Fig. 2-2.14.22-1 Seal Configurations for Inserts in Acrylic Windows
79	2- 3 MATERIAL
80	Fig. 2-2.14.24-1 Restraints for Inserts in Acrylic Windows
81	Table 2- 3.4- 1 Specified Values of Physical Properties for Each Lot
83	Table 2- 3.4- 2 Specified Values of Physical Properties for Each Casting
86	2- 4 FABRICATION
87	Table 2- 4.5- 1 Annealing Schedule for Acrylic Windows
88	2- 5 INSPECTION
89	2- 6 MARKING
90	2- 7 PRESSURE TESTING
92	2- 8 INSTALLATION OF WINDOWS IN CHAMBERS 2- 9 REPAIR OF DAMAGED WINDOWS PRIOR TO BEING PLACED IN SERVICE
93	2- 10 GUIDELINES FOR APPLICATION OF THE REQUIREMENTS OF SECTION 2
98	Section 3 Quality Assurance for PVHO Manufacturers 3- 1 GENERAL 3- 2 RESPONSIBILITIES
99	Section 4 Piping Systems 4- 1 GENERAL
100	4- 2 MATERIAL REQUIREMENTS Table 4- 2.1.1- 1 Maximum Allowable Stress Values for Seamless Pipe and Tube Materials Not Listed in Nonmandatory Appendix A of ASME B31.1
102	4- 3 DESIGN OF COMPONENTS 4- 4 SELECTION AND LIMITATIONS OF PIPING COMPONENTS
103	4- 5 SELECTION AND LIMITATIONS OF PIPING JOINTS
104	4- 6 SUPPORTS 4- 7 INSPECTION
105	4- 8 TESTING Table 4- 7.1- 1 Mandatory Minimum Nondestructive Examinations for Pressure Welds in Piping Systems for Pressure Vessels for Human Occupancy
106	4- 9 SYSTEMS
111	Fig. 4-9.14.2-1 Flow Diagram of Apparatus for Measuring the Concentration of Hydrocarbons in a Stream of Air or Other Gas After It Has Passed Through a Test Hose Table 4- 9.14.2- 1 Maximum Allowable Concentration of Hydrocarbons in Air Passing Through Hose
112	Section 5 Medical Hyperbaric Systems 5- 1 GENERAL 5- 2 PVHO SYSTEM DESIGN 5- 3 GAS SYSTEMS
113	5- 4 CONTROL SYSTEMS AND INSTRUMENTATION 5- 5 ENVIRONMENTAL SYSTEMS
114	Section 6 Diving Systems 6- 1 GENERAL
115	6- 2 DESIGN
117	6- 3 PRESSURE BOUNDARY
118	6- 4 SYSTEMS
119	6- 5 TESTING
120	Section 7 Submersibles 7- 1 GENERAL
121	7- 2 PRESSURE BOUNDARY
122	7- 3 PIPING 7- 4 ELECTRICAL SYSTEMS
123	7- 5 LIFE SUPPORT
124	7- 6 FIRE PROTECTION 7- 7 NAVIGATION
125	7- 8 COMMUNICATIONS 7- 9 INSTRUMENTATION 7- 10 BUOYANCY, STABILITY, EMERGENCY ASCENT, AND ENTANGLEMENT
126	7- 11 EMERGENCY EQUIPMENT
127	MANDATORY APPENDIX I REFERENCE CODES, STANDARDS, AND SPECIFICATIONS
129	MANDATORY APPENDIX II DEFINITIONS
134	NONMANDATORY APPENDIX A DESIGN OF SUPPORTS AND LIFTING ATTACHMENTS
135	NONMANDATORY APPENDIX B RECOMMENDATIONS FOR THE DESIGN OF THROUGH- PRESSURE BOUNDARY PENETRATIONS B- 1 GENERAL B- 2 PENETRATOR DESIGNS B- 3 COUPLING DETAILS B- 4 MATERIALS
138	NONMANDTORY APPENDIX C RECOMMENDED PRACTICES FOR COLOR CODING AND LABELING Table C- 1 U. S. Navy Table C- 2 IMO
139	NONMANDATORY APPENDIX D GUIDELINES FOR THE SUBMISSION OF A PVHO CASE FOR THE USE OF NONSTANDARD DESIGNS, MATERIALS, AND CONSTRUCTION D- 1 INTRODUCTION D- 2 GENERAL D- 3 MATERIALS
140	D- 4 DESIGN D- 5 TESTING
141	D- 6 QUALITY ASSURANCE OVERVIEW BY AN INDEPENDENT THIRD- PARTY AGENT
142	D- 7 STATISTICAL ANALYSIS
143	Table D- 7 Tabulated Data for Performance of ” W- Test” for Normality of Data Set
145	NONMANDATORY APPENDIX E USEFUL REFERENCES
147	ASME PVHO-1 INTERPRETATIONS VOLUME 6
148	Interpretation: 6-1 Interpretation: 6-2 Interpretation: 6-3 Interpretation: 6-4
149	Interpretation: 6-5 Interpretation: 6-6 Interpretation: 6-7
150	Interpretation: 6-8
151	ASME PVHO- 1 CASES
155	1 GENERAL Table 11- 1 Maximum Flange- to- Flange Relative Displacement 2 MATERIALS
157	3 DESIGN AND MANUFACTURE 4 TESTING
158	5 QUALITY ASSURANCE PROGRAM
160	6 MARKING
162	1 GENERAL
164	Table 12- 1 2 MATERIALS 3 DESIGN AND MANUFACTURE
165	Table 12- 2 Structural Nonmetallic Materials of Construction — Pressure Tube Table 12- 3 Test Procedures and/ or Specifications Listed in Table 12- 2 or Referred to in Case 12
166	4 TESTING
167	5 QUALITY ASSURANCE
169	6 MARKING
173	1 GENERAL
175	2 MATERIALS 3 DESIGN AND FABRICATION
176	Table 15- 1 PVHO Materials of Construction
177	4 TESTING
178	5 QUALITY ASSURANCE PROGRAM
180	6 MARKING 7 DOCUMENTATION

Published By	Publication Date	Number of Pages
ASME	2012	184


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Standard Title	ASME PVHO-1 Safety Standard for Pressure Vessels for Human Occupancy
Published Code	ASME
Publication Date	2012
Pages Count	184

ASME PVHO 1 2012

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