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ASME PVHO-2-2019
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ASME PVHO-2-2019 Safety Standard for Pressure Vessels for Human Occupancy: In-Service Guidelines
standard by ASME International, 01/24/2020
Full Description
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.In stock
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Safety Standard
for Pressure Vessels for Human Occupancy: In-Service Guidelines
AN A MERICAN NA TIONAL S T AND ARD
ASME PVHO-2–2019
(Revision of ASME PVHO-2–2016)
ASME PVHO-2–2019
(Revision of ASME PVHO-2–2016)
Safety Standard
for Pressure Vessels for Human Occupancy: In-Service Guidelines
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Correspondence With the PVHO Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Section 1 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-1 | Introduction and Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-2 | Responsibilities and Jurisdictional Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-3 | In-Service Evaluations, Repairs, and Modification of PVHOs . . . . . . . . . . . . . . . . . . . . . . | 1 |
1-4 | PVHO and PVHO Systems Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 2 |
1-5 | Owner’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 2 |
1-6 | Maintenance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 3 |
1-7 | Checklists and Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 3 |
Section 2 | Viewports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 5 |
2-1 | Responsibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 5 |
2-2 | Factors Affecting Service Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 5 |
2-3 | Handling of PVHO Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 6 |
2-4 | Operational and Maintenance Inspections of PVHO Viewports . . . . . . . . . . . . . . . . . . . . | 7 |
2-5 | Categories of Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 9 |
2-6 | Repair of Damaged PVHO Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 9 |
2-7 | Mechanical Property Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 11 |
2-8 | Testing Requirements for Increasing the 40,000-hr Design Life . . . . . . . . . . . . . . . . . . . | 13 |
Mandatory Appendices
Definitions 24
Reference Standards and Specifications 27
Quality Assurance Program for Repair of Severely Damaged Windows 28
Additional Window Repair Requirements and Forms 31
Partial List of Harmful Substances and Acceptable Products 38
Mechanical Testing Computations and Forms 40
Nonmandatory Appendices
A | Checklists and Logs for PVHO Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 44 |
B | Operation of Submersible Craft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 45 |
Tables 2-4.1-1 | Periodic Inspection Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 14 |
2-4.1.1-1 | Limits for Blemishes or Flaws on Standard Window Geometry Surfaces . . . . . . . . . . . . . | 15 |
2-4.1.1-2 | Limits for Blemishes or Flaws on All Other Standard Window Geometry Surfaces . . . . . . | 17 |
iii
2-4.1.1-3 | Limits on Chipping of Sharp Edges on Standard Window Geometries . . . . . . . . . . . . . . . | 18 |
2-4.3-1 | Maximum Intervals for Maintenance Viewport Inspection . . . . . . . . . . . . . . . . . . . . . . . | 18 |
2-4.3-2 | Maximum Intervals for Refurbishment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 18 |
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) . . . . . | 32 |
IV-1-2(a) | Annealing Schedule for Acrylic Windows Part A: Minimum Heating Times for Elevated Temperature Annealing of Acrylic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 33 |
IV-1-2(b) | Annealing Schedule for Acrylic Windows Part B: Maximum Cooling Rates for Acrylic Subjected to Elevated Annealing Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 34 |
VI-6-1 | Example Evaluation — Mandatory Appendix VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 41 |
Forms | ||
VM-1 | Viewport Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
VM-2 | Acrylic Window Repair Certification for Severely Damaged Windows . . . . . . . . . . . . . . . | 20 |
VM-3 | Acrylic Window Repair Certification for Slightly Damaged Windows Repaired by the User (or the User’s Authorized Agent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 22 |
VT-1 | Pressure Testing Report for Increasing Window Service Life Beyond the 40,000-hr Design Life | 23 |
IV-1-1 | Material Testing Certification for Repair by Spot Casting . . . . . . . . . . . . . . . . . . . . . . . . | 35 |
IV-1-2 | Annealing Process Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 36 |
IV-5-1 | Pressure Testing Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 37 |
VI-1 | Material Testing Results for Continued Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 42 |
VI-2 | Material Testing Evaluation for Continued Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 43 |
iv
FOREWORD
In 1998 a PVHO Task Group was formed to investigate the need for In-Service Rules and Guidelines for Pressure Vessels for Human Occupancy. Simultaneously, a Sub Task Group was formed to investigate the issue of acrylic window design life versus service life. The design life is based on the PVHO window being exposed to the maximum allowable working pressure (MAWP), at the maximum rated temperature, for the maximum number of (design) cycles, in an outdoor weathering environment. The majority of PVHOs are not operated to such extremes, and service life may indeed be longer than design life. Conversely, if a window is not properly cared for (i.e., becomes exposed, either operationally or nonoperationally, to other detrimental factors that are not, and cannot be, factored into the design life), then the actual service life could be much shorter than the design life. Thus, the recommendation was made that design life and service life be addressed as two different subjects. In 1999 the In-Service Task Group became a PVHO subcommittee, with the most immediate task being the establishment of in-service criteria for PVHO windows and viewports.
This Standard provides the necessary in-service criteria to supplement Section 2, Viewports, of ASME PVHO-1, which applies to new construction only. By comparison, this Standard applies to all ASME PVHO-1 acrylic windows, regardless of their date of manufacture. This Standard consists of both technical criteria and guidelines. They are intended to provide guidance to the user and/or the jurisdictional authority in regard to the establishment of potential service life, and the necessary care, inspection, and repair during that service life—depending on the actual service conditions to which the PVHO and windows have been, or will be, exposed.
Finally, this Standard was prepared as a “stand-alone” document. All forms additional to those normally supplied with the window in accordance with ASME PVHO-1, which may be necessary throughout the service life of the window, are provided herein. Similarly, all necessary ASME PVHO-1 technical data applicable to service and repair (if required) are also provided in this Standard.
The 2019 edition of ASME PVHO-2 further develops and clarifies the in-service guidelines for PVHOs. The requirements for in-service pressure testing gauge calibration have been updated. Nonmandatory Appendix A, covering checklists and logs for PVHO operation, has been deleted, and the text under this appendix has been integrated into the general re- quirements of Section 1. New testing criteria for increasing the 40,000-hr design life of acrylic windows have been incorporated under Section 2. Additionally, new forms have been added, and some of the existing forms have been updated.
Sections on the following topics are in development are in development and may be included in future editions: quality assurance for PVHO manufacturers, piping systems, medical hyperbaric systems, diving systems, and submersibles.
Previous editions of this Standard were issued in 2003, 2012, and 2016. The 2019 edition of this Standard was approved by the American National Standards Institute as an American National Standard on December 4, 2019.
v
ASME PRESSURE VESSELS FOR
HUMAN OCCUPANCY COMMITTEE
(The following is the roster of the Committee as of February 1, 2019.)
STANDARDS COMMITTEE OFFICERS
G. Wolfe, Chair
J. Witney, Vice Chair
E. Lawson, Secretary
STANDARDS COMMITTEE PERSONNEL
J. E. Crouch, Southwest Research Institute
B. Faircloth, FMS Engineering, LLC
M. A. Frey, Naval Sea Systems Command
T. R. Galloway, Naval Sea Systems Command
B. Kemper, Kemper Engineering Services, LLC
W. Kohnen, Hydrospace Group, Inc.
Lawrence, U.S. Coast Guard
Lawson, The American Society of Mechanical Engineers
S. Reimers, Reimers Systems, Inc.
G. Richards, Blanson, Ltd.
T. C. Schmidt, Lockheed Martin
K. A. Smith, U.S. Coast Guard
R. C. Smith, Naval Facilities Engineering Command, Ocean Facilities Program
J. Stromer, Triton Submarines
D. Talati, Sechrist Industries, Inc.
R. Thomas, American Bureau of Shipping
M. R. Walters, Oceaneering International, Inc.
J. Witney, Atlantis Submarines International
G. Wolfe, Southwest Research Institute
E. G. Fink, Delegate, Fink Engineering Pty., Ltd.
H. Pauli, Delegate, Germanischer Lloyd AG
J. S. Selby, Delegate, SOS Group Global, Ltd.
L. Cross, Alternate, Kemper Engineering Services, LLC
J. P. Hierholzer, Alternate, DNV GL
J. K. Martin, Alternate, Perry Technologies
P. Selby, Alternate, SOS Group Global, Ltd.
M. W. Allen, Contributing Member, Microbaric Oxygen Systems, LLC
W. F. Crowley, Jr., Contributing Member, Aerospace & Undersea Support Services, LLC
W. Davison, Contributing Member, Consultant
G. J. Jacob, Contributing Member, Navy Experimental Diving Unit
J. Maison, Contributing Member, Adaptive Computer Technology, Inc.
T. Marohl, Contributing Member
J. C. Sheffield, Contributing Member, International ATMO, Inc.
HONORARY MEMBERS
R. J. Dzikowski
F. T. Gorman
L. G. Malone, Plastic Supply & Fabric, Inc.
R. P. Swanson
SPECIAL PROJECTS TASK GROUP
J. Witney, Chair, Atlantis Submarines International
J. E. Crouch, Southwest Research Institute
E. G. Fink, Fink Engineering Pty., Ltd.
M. A. Frey, Naval Sea Systems Command
T. R. Galloway, Naval Sea Systems Command
B. Kemper, Kemper Engineering Services, LLC
W. Kohnen, Hydrospace Group, Inc.
S. Reimers, Reimers Systems, Inc.
G. Richards, Blanson, Ltd.
R. C. Smith, Naval Facilities Engineering Command, Ocean Facilities Program
G. Wolfe, Southwest Research Institute
Cross, Alternate, Kemper Engineering Services, LLC
W. Allen, Contributing Member, Microbaric Oxygen Systems, LLC
K. Kemper, Contributing Member, Kemper Engineering Services, LLC
TASK GROUP ON TUNNELING
Cross, Kemper Engineering Services, LLC
G. L. East, ASI Marine
E. G. Fink, Fink Engineering Pty., Ltd.
J. P. Hierholzer, DNV GL
B. Kemper, Kemper Engineering Services, LLC
W. Kohnen, Hydrospace Group, Inc.
S. Reimers, Reimers Systems, Inc.
M. W. Allen, Contributing Member, Microbaric Oxygen Systems, LLC
vi
SUBCOMMITTEE ON DESIGN AND PIPING SYSTEMS
T. C. Schmidt, Chair, Lockheed Martin
B. Faircloth, Vice Chair, FMS Engineering, LLC
E. Lawson, Secretary, The American Society of Mechanical Engineers
G. Bryant, Consultant
W. Davison, Consultant
R. K. Dixit, PCCI, Inc. (Reimers Division)
P. Forte, Woods Hole Oceanographic Institution
M. A. Frey, Naval Sea Systems Command
T. R. Galloway, Naval Sea Systems Command
C. Gaumond, Groupe Medical Gaumond
B. Humberstone, Diving Technical Advisor
G. J. Jacob, Navy Experimental Diving Unit
B. Kemper, Kemper Engineering Services, LLC
S. Reimers, Reimers Systems, Inc.
D. A. Renear, Aqua-Air Industries, Inc.
G. Richards, Blanson, Ltd.
R. Thomas, American Bureau of Shipping
M. R. Walters, Oceaneering International, Inc.
J. S. Selby, Delegate, SOS Group Global, Ltd.
L. Cross, Alternate, Kemper Engineering Services, LLC
J. K. Martin, Alternate, Perry Technologies
J. N. Pollack, Alternate, U.S. Navy
P. Selby, Alternate, SOS Group Global, Ltd.
R. M. Webb, Alternate, Naval Sea Systems Command
M. W. Allen, Contributing Member, Microbaric Oxygen Systems, LLC
F. Burman, Contributing Member, Divers Alert Network
W. F. Crowley, Jr., Contributing Member, Aerospace & Undersea Support Services, LLC
K. K. Kemper, Contributing Member, Kemper Engineering Services, LLC
SUBCOMMITTEE ON DIVING SYSTEMS
R. Thomas, Chair, American Bureau of Shipping
T. R. Galloway, Vice Chair, Naval Sea Systems Command
E. Lawson, Secretary, The American Society of Mechanical Engineers
G. Bryant, Consultant
W. F. Crowley, Jr., Aerospace & Undersea Support Services, LLC
G. L. East, ASI Marine
B. Faircloth, FMS Engineering, LLC
B. Humberstone, Diving Technical Advisor
B. Kemper, Kemper Engineering Services, LLC
D. Lawrence, U.S. Coast Guard
J. K. Martin, Perry Technologies
D. A. Renear, Aqua-Air Industries, Inc.
S. Selby, SOS Group Global, Ltd.
A. Smith, U.S. Coast Guard
M. R. Walters, Oceaneering International, Inc.
E. G. Fink, Delegate, Fink Engineering Pty., Ltd.
H. Pauli, Delegate, Germanischer Lloyd AG
L. Cross, Alternate, Kemper Engineering Services, LLC
T. Gilman, Alternate, U.S. Coast Guard
P. Selby, Alternate, SOS Group Global, Ltd.
M. W. Allen, Contributing Member, Microbaric Oxygen Systems, LLC
K. K. Kemper, Contributing Member, Kemper Engineering Services, LLC
T. Marohl, Contributing Member
SUBCOMMITTEE ON GENERAL REQUIREMENTS
M. A. Frey, Chair, Naval Sea Systems Command
B. Kemper, Vice Chair, Kemper Engineering Services, LLC
E. Lawson, Secretary, The American Society of Mechanical Engineers
J. E. Crouch, Southwest Research Institute
T. R. Galloway, Naval Sea Systems Command
S. Reimers, Reimers Systems, Inc.
J. Witney, Atlantis Submarines International
L. Cross, Alternate, Kemper Engineering Services, LLC
J. N. Pollack, Alternate, U.S. Navy
R. M. Webb, Alternate, Naval Sea Systems Command
M. W. Allen, Contributing Member, Microbaric Oxygen Systems, LLC
G. J. Jacob, Contributing Member, Navy Experimental Diving Unit
K. K. Kemper, Contributing Member, Kemper Engineering Services, LLC
SUBCOMMITTEE ON MEDICAL HYPERBARIC SYSTEMS
G. Richards, Chair, Blanson, Ltd.
T. Dingman, Vice Chair, Healogics
Lawson, Secretary, The American Society of Mechanical Engineers
Burman, Divers Alert Network
L. Cross, Kemper Engineering Services, LLC
W. T. Gurnee, Oxyheal Health Group
S. Reimers, Reimers Systems, Inc.
R. C. Smith, Naval Facilities Engineering Command, Ocean Facilities Program
Talati, Sechrist Industries, Inc.
G. Fink, Delegate, Fink Engineering Pty., Ltd.
H. Pauli, Delegate, Germanischer Lloyd AG
B. Kemper, Alternate, Kemper Engineering Services, LLC
M. W. Allen, Contributing Member, Microbaric Oxygen Systems, LLC
W. Davison, Contributing Member, Consultant
K. W. Evans, Contributing Member, Perry Baromedical
K. K. Kemper, Contributing Member, Kemper Engineering Services, LLC
J. C. Sheffield, Contributing Member, International ATMO, Inc.
N. To, Contributing Member, U.S. Food and Drug Administration
vii
SUBCOMMITTEE ON POST CONSTRUCTION
J. E. Crouch, Chair, Southwest Research Institute
R. C. Smith, Vice Chair, Naval Facilities Engineering Command, Ocean Facilities Program
E. Lawson, Secretary, The American Society of Mechanical Engineers
G. Bryant, Consultant
T. Dingman, Healogics
M. A. Frey, Naval Sea Systems Command