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ASME PVHO-1-2019
M00050816
New product
ASME PVHO-1-2019 Safety Standard for Pressure Vessels for Human Occupancy
standard by ASME International, 01/24/2020
Full Description
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.In stock
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Safety Standard for Pressure Vessels for Human Occupancy
AN A MERICAN NA TIONAL S T AND ARD
ASME PVHO-1–2019
(Revision of ASME PVHO-1–2016)
ASME PVHO-1–2019
(Revision of ASME PVHO-1–2016)
Safety Standard for
Pressure Vessels for Human Occupancy
AN AMERICAN NATIONAL STANDARD
Date of Issuance: January 24, 2020
The next edition of this Standard is scheduled for publication in 2022.
ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. Periodically certain actions of the ASME PVHO Committee may be published as Cases. Cases and interpretations are published on the ASME website under the Committee Pages at https://cstools.asme.org/ as they are issued.
Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards. Such errata shall be used on the date posted.
The Committee Pages can be found at https://cstools.asme.org/. There is an option available to automatically receive an e-mail notification when errata are posted to a particular code or standard. This option can be found on the appropriate Committee Page after selecting “Errata” in the “Publication Information” section.
ASME is the registered trademark of The American Society of Mechanical Engineers.
This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large.
ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.
ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.
Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.
ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals.
No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise,
without the prior written permission of the publisher.
The American Society of Mechanical Engineers Two Park Avenue, New York, NY 10016-5990
Copyright © 2020 by
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All rights reserved Printed in U.S.A.
CONTENTS
Foreword viii
Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Correspondence With the PVHO Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
Summary of Changes xiv
Section 1 | General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-1 | Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-2 | Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-3 | Exclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-4 | User Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-5 | Manufacturer's Data Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-6 | Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 2 |
1-7 | Design and Fabrication Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 2 |
1-8 | Pressure Relief Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 9 |
1-9 | Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 9 |
1-10 | Nonmetallic Materials and Toxicity Off-Gas Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 9 |
1-11 | Risk Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 10 |
1-12 | Lithium Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 10 |
1-13 | Automatic Control and Software Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 12 |
1-14 | Operational Pressure Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 12 |
Section 2 | Viewports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
2-1 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
2-2 | Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
2-3 | Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 30 |
2-4 | Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 33 |
2-5 | Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 33 |
2-6 | Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 35 |
2-7 | Pressure Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 36 |
2-8 | Installation of Windows in Chambers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 36 |
2-9 | Repair of Damaged Windows Prior to Being Placed in Service . . . . . . . . . . . . . . . . . . . . | 37 |
2-10 | Guidelines for Application of the Requirements of Section 2 . . . . . . . . . . . . . . . . . . . . . . | 38 |
Section 3 | Quality Assurance for PVHO Manufacturers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 88 |
3-1 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 88 |
3-2 | Responsibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 88 |
Section 4 | Piping Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 89 |
4-1 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 89 |
4-2 | Material Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 89 |
4-3 | Design of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 91 |
4-4 | Selection and Limitations of Piping Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 92 |
4-5 | Selection and Limitations of Piping Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 93 |
4-6 | Supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 94 |
4-7 | Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 94 |
4-8 | Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 95 |
4-9 | Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 95 |
Section 5 | Medical Hyperbaric Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 103 |
5-1 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 103 |
5-2 | PVHO System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 104 |
5-3 | Gas Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 104 |
5-4 | Control Systems and Instrumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 104 |
5-5 | Environmental Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 104 |
Section 6 | Diving Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 106 |
6-1 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 106 |
6-2 | Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
6-3 | Pressure Boundary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 108 |
6-4 | Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 110 |
6-5 | Handling Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 114 |
6-6 | Hyperbaric Evacuation Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 115 |
6-7 | Testing and Trials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 117 |
Section 7 | Submersibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 119 |
7-1 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 119 |
7-2 | Pressure Boundary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 120 |
7-3 | Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 121 |
7-4 | Electrical Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 121 |
7-5 | Life Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 122 |
7-6 | Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 123 |
7-7 | Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 123 |
7-8 | Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 124 |
7-9 | Instrumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 124 |
7-10 | Buoyancy, Stability, Emergency Ascent, and Entanglement . . . . . . . . . . . . . . . . . . . . . . . | 124 |
7-11 | Emergency Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 125 |
Mandatory Appendices
Reference Codes, Standards, and Specifications 126
Definitions 128
Nonmandatory Appendices
Design of Supports and Lifting Attachments 134
Recommendations for the Design of Through-Pressure Boundary Penetrations 135
Recommended Practices for Color Coding and Labeling 138
Guidelines for the Submission of a Case for the Use of Nonstandard Designs, Materials, and Construction for Non-Flexible PVHO Chamber Fabrication 139
Guidelines for Preparing a Performance-Based Case for Flexible PVHO Chambers and Systems 146
Useful References 176
Figures
1-7.13.1-1 Geometry of Cylinders 15
1-7.13.1-2 Stiffener Geometry 16
1-7.13.1-3 Sections Through Rings 16
1-7.13.5-1 Values of t/Ro and Lc/Ro 17
Form of Nameplate, U.S. Customary Units 18
Form of Nameplate, SI Units 18
2-2.2.1-1 Standard Window Geometries — Part 1 43
2-2.2.1-2 Standard Window Geometries — Part 2 44
2-2.2.1-3 Standard Window Geometries — Part 3 45
2-2.2.1-4 Standard Window Geometries — Part 4 46
2-2.5.1-1 Short-Term Critical Pressure of Flat Disk Acrylic Windows — Part 1 49
2-2.5.1-2 Short-Term Critical Pressure of Flat Disk Acrylic Windows — Part 2 50
2-2.5.1-3 Short-Term Critical Pressure of Flat Disk Acrylic Windows — Part 3 51
2-2.5.1-4 Short-Term Critical Pressure of Conical Frustum Acrylic Windows — Part 1 52
2-2.5.1-5 Short-Term Critical Pressure of Conical Frustum Acrylic Windows — Part 2 53
2-2.5.1-6 Short-Term Critical Pressure of Spherical Sector Acrylic Windows — Part 1 54
2-2.5.1-7 Short-Term Critical Pressure of Spherical Sector Acrylic Windows — Part 2 55
2-2.5.1-8 Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Internally — Part 1 56
2-2.5.1-9 Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Internally — Part 2 57
2-2.5.1-10 Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Externally 58
2-2.5.1-11 Short-Term Elastic Buckling of Cylindrical Acrylic Windows Between Supports Under External Hydrostatic Pressure — Part 1 59
2-2.5.1-12 Short-Term Elastic Buckling of Cylindrical Acrylic Windows Between Supports Under External Hydrostatic Pressure — Part 2 60
2-2.5.1-13 Short-Term Elastic Buckling of Cylindrical Acrylic Windows Between Supports Under External Hydrostatic Pressure — Part 3 61
2-2.5.1-14 Short-Term Critical Pressure of Hyperhemispherical and NEMO-Type Acrylic Windows —
Part 1 62
2-2.5.1-15 Short-Term Critical Pressure of Hyperhemispherical and NEMO-Type Acrylic Windows —
Part 2 63
2-2.10.1-1 Seat Cavity Requirements — Conical Frustum Window, Spherical Sector Window With Conical
Edge, and Flat Disk Window 64
2-2.10.1-2 Seat Cavity Requirements — Double-Beveled Disk Window 65
2-2.10.1-3 Seat Cavity Requirements — Spherical Sector Window With Square Edge 66
2-2.10.1-4 Seat Cavity Requirements — Hemispherical Window With Equatorial Flange 67
2-2.10.1-5 Seat Cavity Requirements — Cylindrical Window 68
2-2.10.1-6 Seat Cavity Requirements — Hyperhemispherical Window 69
2-2.10.1-7 Seat Cavity Requirements — NEMO Window (Standard Seat) 70
2-2.10.1-8 Seat Cavity Requirements — NEMO Window (Seat With Extended Cyclic Fatigue Life) . . 71 2-2.11.10-1 Bevels on Window Edges — Flat Disk Windows, Conical Frustum Windows, Spherical Sector
Windows, Hyperhemispheres 72
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
2-2.11.11-1 Acceptable Configurations for Clear Viewport Retaining Covers 74
2-2.14.11-1 Dimensional Tolerances for Penetrations in Acrylic Windows 75
2-2.14.15-1 Dimensional Tolerances for Inserts in Acrylic Windows 77
2-2.14.16-1 | Typical Shapes of Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 78 |
2-2.14.22-1 | Seal Configurations for Inserts in Acrylic Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 79 |
2-2.14.24-1 | Restraints for Inserts in Acrylic Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 80 |
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 . . . . . . . . . . . . . . . . . . . . . | 102 |
6-6.2.2-1 | Placement and Design of Markings for Hyperbaric Evacuation Units Designed to Float in Water | 118 |
6-6.2.2-2 | Markings for Hyperbaric Evacuation Units Designed to Float in Water . . . . . . . . . . . . . . | 118 |
B-2-1 | Acceptable Weld Nozzle Penetrators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 136 |
B-3-1 | Acceptable Threads and Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 137 |
E-3.3.1-1 | Cook’s Diagram: Atmosphere of Increased Burning Rate . . |