Safety Standard for Pressure Vessels for Human Occupancy

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1 ASME PVHO (Revision of ASME PVHO ) Safety Standard for Pressure Vessels for Human Occupancy AN AMERICAN NATIONAL STANDARD

2 ASME PVHO (Revision of ASME PVHO ) Safety Standard for Pressure Vessels for Human Occupancy AN AMERICAN NATIONAL STANDARD Three Park Avenue New York, NY USA

3 Date of Issuance: May 31, 2012 The next edition of this Standard is scheduled for publication in 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 Web site under the Committee Pages at as they are issued. Errata to codes and standards may be posted on the ASME Web site 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 There is an option available to automatically receive an 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 assumes 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 Three Park Avenue, New York, NY Copyright 2012 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A.

4 CONTENTS Foreword... Committee Roster... Correspondence With the PVHO Committee... Summary of Changes... vii viii x xii Section 1 General Requirements Introduction Scope Exclusions User Requirements Manufacturer s Data Report Materials Design and Fabrication Requirements Pressure Relief Devices Marking Nonmetallic Materials and Toxicity Offgas Testing Risk Analysis Section 2 Viewports General Design Material Fabrication Inspection Marking Pressure Testing Installation of Windows in Chambers Repair of Damaged Windows Prior to Being Placed in Service Guidelines for Application of the Requirements of Section Section 3 Quality Assurance for PVHO Manufacturers General Responsibilities Section 4 Piping Systems General Material Requirements Design of Components Selection and Limitations of Piping Components Selection and Limitations of Piping Joints Supports Inspection Testing Systems Section 5 Medical Hyperbaric Systems General PVHO System Design Gas Systems Control Systems and Instrumentation Environmental Systems iii

5 Section 6 Diving Systems General Design Pressure Boundary Systems Testing Section 7 Submersibles General Pressure Boundary Piping Electrical Systems Life Support Fire Protection Navigation Communications Instrumentation Buoyancy, Stability, Emergency Ascent, and Entanglement Emergency Equipment Figures Geometry of Cylinders Stiffener Geometry Sections Through Rings Values of t/r o and L c /R o (b)-1 Form of Nameplate, U.S. Customary (b)-2 Form of Nameplate, Metric Standard Window Geometries Standard Window Geometries Standard Window Geometries Standard Window Geometries Short-Term Critical Pressure of Flat Disk Acrylic Windows Short-Term Critical Pressure of Flat Disk Acrylic Windows Short-Term Critical Pressure of Flat Disk Acrylic Windows Short-Term Critical Pressure of Conical Frustum Acrylic Windows Short-Term Critical Pressure of Conical Frustum Acrylic Windows Short-Term Critical Pressure of Spherical Sector Acrylic Windows Short-Term Critical Pressure of Spherical Sector Acrylic Windows Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Internally Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Internally Short-Term Critical Pressure of Cylindrical Acrylic Windows Pressurized Externally Short-Term Elastic Buckling of Cylindrical Acrylic Windows Between Supports Under External Hydrostatic Pressure Short-Term Elastic Buckling of Cylindrical Acrylic Windows Between Supports Under External Hydrostatic Pressure Short-Term Elastic Buckling of Cylindrical Acrylic Windows Between Supports Under External Hydrostatic Pressure Short-Term Critical Pressure of Hyperhemispherical and NEMO Type Acrylic Windows Short-Term Critical Pressure of Hyperhemispherical and NEMO Type Acrylic Windows Seat Cavity Requirements Conical Frustum Window, Spherical Sector Window With Conical Edge, and Flat Disk Window Seat Cavity Requirements Double Beveled Disk Window iv

6 Seat Cavity Requirements Spherical Sector Window With Square Edge Seat Cavity Requirements Hemispherical Window With Equatorial Flange Seat Cavity Requirements Cylindrical Window Seat Cavity Requirements Hyperhemispherical Window Seat Cavity Requirements NEMO Window (Standard Seat) Seat Cavity Requirements NEMO Window (Seat With Extended Cyclic Fatigue Life) Bevels on Window Edges Flat Disk Windows, Conical Frustum Windows, Spherical Sector Windows, Hyperhemispheres Bevels on Window Edges Flanged Hemispherical Window, Spherical Sector Window With Square Edge, External Pressure and Internal Pressure of Cylindrical Windows Dimensional Tolerances for Penetrations in Acrylic Windows Dimensional Tolerances for Inserts in Acrylic Windows Typical Shapes of Inserts Seal Configurations for Inserts in Acrylic Windows Restraints for Inserts in Acrylic Windows 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 Tables Conversion Factor, Fp (For PVHO Occupation Exceeding 8 hr) Conversion Factors for Acrylic Flat Disk Windows Conversion Factors for Acrylic Conical Frustum Windows and Double Beveled Disk Windows Conversion Factors for Acrylic Spherical Sector Windows With Conical Edge, Hyperhemispherical Windows With Conical Edge, and NEMO Type Windows With Conical Edge Conversion Factors for Acrylic Spherical Sector Windows With Square Edge and Hemispherical Windows With Equatorial Flange Conversion Factors for Acrylic Cylindrical Windows Conical Frustum Windows for Design Pressures in Excess of 10,000 psi (69 MPa) Specified Values of Physical Properties for Polycarbonate Plastic Specified Values of Physical Properties for Cast Nylon Plastic Specified Values of Physical Properties for Each Lot Specified Values of Physical Properties for Each Casting Annealing Schedule for Acrylic Windows Maximum Allowable Stress Values for Seamless Pipe and Tube Materials Not Listed in Nonmandatory Appendix A of ASME B Mandatory Minimum Nondestructive Examinations for Pressure Welds in Piping Systems for Pressure Vessels for Human Occupancy Maximum Allowable Concentration of Hydrocarbons in Air Passing Through Hose Forms GR-1 Manufacturer s Data Report for Pressure Vessels for Human Occupancy... 4 GR-1S Manufacturer s Data Report Supplementary Sheet... 5 VP-1 Fabrication Certification for Acrylic Windows VP-2 Acrylic Window Design Certification VP-3 Material Manufacturer s Certification for Acrylic VP-4 Material Testing Certification for Acrylic VP-5 Pressure Testing Certification VP-6 Acrylic Window Repair Certification v

7 Mandatory Appendices I Reference Codes, Standards, and Specifications II Definitions Nonmandatory Appendices A Design of Supports and Lifting Attachments B Recommendations for the Design of Through-Pressure Boundary Penetrations C Recommended Practices for Color Coding and Labeling D Guidelines for the Submission of a PVHO Case for the Use of Nonstandard Designs, Materials, and Construction E Useful References vi

Managing System Integrity of Gas Pipelines

ASME B31.8S-2014 (Revision of ASME B31.8S-2012) Managing System Integrity of Gas Pipelines ASME Code for Pressure Piping, B31 Supplement to ASME B31.8 AN INTERNATIONAL PIPING CODE ASME B31.8S-2014 (Revision