1、AN AMERICAN NATIONAL STANDARD ASME PVHO-22012Revision of ASME PVHO-22003 (R2008)Safety Standardfor Pressure Vessels for Human Occupancy: In-Service GuidelinesASME PVHO-22012Revision of ASME PVHO-22003 (R2008)Safety Standardfor Pressure Vesselsfor Human Occupancy:In-Service GuidelinesAN AMERICAN NATI
2、ONAL STANDARDTwo Park Avenue New York, NY 10016 USADate of Issuance: June 7, 2013The next edition of this Standard is scheduled for publication in 2015.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Periodically certain actions of the ASME P
3、VHO Committee may be published as Cases.Cases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org/ as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly
4、published items, or to correct typographical or grammatical errorsin codes and standards. Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/. There is an option available toautomatically receive an e-mail notification when errata are posted to a
5、particular code or standard.This option can be found on the appropriate Committee Page after selecting “Errata” in the “PublicationInformation” section.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as
6、meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailable for public review and
7、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
8、any patent rights asserted in connection with anyitems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expresslyadvised that de
9、termination of the validity of any such patent rights, and the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code o
10、r standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME 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 retriev
11、al system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2013 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCor
12、respondence With the PVHO Committee viiSummary of Changes ixSection 1 General . 11-1 Introduction and Scope 11-2 Responsibilities and Jurisdictional Considerations . 11-3 In-Service Evaluations, Repairs, and Modifications of PVHOs . 11-4 PVHO and PVHO Systems Documentation . 21-5 Owners Manual . 21-
13、6 Maintenance Requirements . 2Section 2 Viewports. 42-1 Responsibilities 42-2 Factors Affecting Service Life . 42-3 Handling of PVHO Windows 52-4 Operational and Maintenance Inspections of PVHO Viewports 62-5 Categories of Damage 82-6 Repair of Damaged PVHO Windows . 82-7 Mechanical Property Testing
14、 . 10Tables2-4.1-1 Periodic Inspection Requirements . 122-4.1-2 Limits for Blemishes or Flaws on Window Surfaces . 132-4.1-3 Limits for Blemishes or Flaws on All Other Window Surfaces . 152-4.1-4 Limits on Chipping of Sharp Edges on Windows . 162-4.3-1 Maximum Intervals for Maintenance Viewport Insp
15、ection . 172-4.3-2 Maximum Intervals for Refurbishment 17FormsVP-1 Viewport Inspection . 18VP-2 Acrylic Window Repair Certification for Windows Repaired by the User(or His Authorized Agent) . 19VP-3 Acrylic Window Repair Certification for Severely Damaged Windows . 20Mandatory AppendicesI Definition
16、s . 23II Reference Standards and Specifications . 25III Quality Assurance Program for Repair of Severely Damaged Windows 26IV Additional Window Repair Requirements and Forms . 29V Partial List of Harmful Substances and Acceptable Products . 35VI Mechanical Testing Computations and Forms . 37iiiFOREW
17、ORDIn 1998 a PVHO Task Group was formed to investigate the need for In-Service Rules andGuidelines for Pressure Vessels for Human Occupancy. Simultaneously, a Sub Task Group wasformed to investigate the issue of acrylic window design life versus service life. The design lifeis based on the PVHO wind
18、ow being exposed to the maximum allowable working pressure(MAWP), at the maximum rated temperature, for the maximum number of (design) cycles, inan outdoor weathering environment. The majority of PVHOs are not operated to such extremes,and service life may indeed be longer than design life. Converse
19、ly, if a window is not properlycared for (i.e., becomes exposed, either operationally or nonoperationally, to other detrimentalfactors that are not, and cannot be, factored into the design life), then the actual service life couldbe much shorter than the design life. Thus, the recommendation was mad
20、e that design life andservice life be addressed as two different subjects. In 1999 the In-Service Task Group became aPVHO subcommittee, with the most immediate task being the establishment of in-service criteriafor PVHO windows and viewports.This Standard provides the necessary in-service criteria t
21、o supplement Section 2, Viewports,of ASME PVHO-1, which applies to new construction only. By comparison, this Standard appliesto all PVHO-1 acrylic windows, regardless of their date of manufacture. This Standard consistsof both Technical Criteria and Guidelines. They are intended to provide guidance
22、 to the Userand/or the Jurisdictional Authority in regard to the establishment of potential Service Life, andthe necessary care, inspection, and repair during that Service Lifedepending on the actualservice conditions to which the PVHO and windows have been, or will be, exposed.Finally, this Standar
23、d was prepared as a “stand-alone” document. All Forms additional tothose normally supplied with the window in accordance with PVHO-1, which may be necessarythroughout the service life of the window, are provided herein. Similarly, all necessary PVHO-1technical data applicable to service and repair (
24、if required) are also provided in this Standard.The 2012 Edition of PVHO-2 has been completely reorganized and expanded to include sectionscovering PVHOs and PVHO systems to bring it in line with the outline of the PVHO-1 standard.In this Edition, the requirements have been grouped into two sections
25、: Section 1, General, coveringrequirements relevant to all PVHOs and PVHO systems; and Section 2, Viewports, coveringrequirements specific to acrylic windows.The previous edition of this Standard was issued in 2003 and reaffirmed in 2008. The 2012 Editionof this Standard was approved as an American
26、National Standard on December 22, 2012.ivASME PRESSURE VESSELS FORHUMAN OCCUPANCY COMMITTEE(The following is the roster of the Committee as of September 6, 2012.)STANDARDS COMMITTEE OFFICERSS. D. Reimers, ChairJ. Witney, Vice ChairG. E. Moino, SecretarySTANDARDS COMMITTEE PERSONNELM. W. Allen, Life
27、Support Tech Group, Inc.W. F. Crowley, Jr., Cal Dive InternationalW. Davison, Oxyheal Health GroupE. G. Fink, Fink Engineering, Ltd.M. A. Frey, Naval Sea Systems CommandT. R. Galloway, Naval Sea Systems CommandG. P. Jacob, Navy Experimental Diving UnitC. B. Kemper III, Kemper EngineeringJ. D. Lawren
28、ce, U.S. Coast GuardP. A. Lewis, Hyperbaric Technologies, Inc.J. R. Maison, Adaptive Computer TechnologyT. T. Marohl, Veolia ES Special ServicesG. E. Moino, The American Society of Mechanical EngineersH. Pauli, Germanischer Lloyd AGHONORARY MEMBERSF. T. GormanL. G. MaloneSUBCOMMITTEE ON DESIGN AND P
29、IPINGT. C. Schmidt, Chair, Lockheed-Martin, Mission Systems however, they shouldnot contain proprietary names or information.Requests that are not in this format will be rewritten in this format by the Committee priorto being answered, which may inadvertently change the intent of the original reques
30、t. ASMEprocedures provide for reconsideration of any interpretation when or if additional informationthat might affect an interpretation is available. Further, persons aggrieved by an interpretationmay appeal to the cognizant ASME Committee or Subcommittee. ASME does not “approve,”“certify,” “rate,”
31、 or “endorse” any item, construction, proprietary device, or activity.PVHO Cases. The ASME PVHO Committee issues Cases. Although PVHO Cases do not consti-tute formal revisions of the Standard, they may be used as representing considered opinions ofthe PVHO Committee. Once approved, Cases are posted
32、on the ASME PVHO Committee Webpage at http:/cstools.asme.org/ and are subsequently published with the next edition of thisStandard. PVHO Cases are not part of the Standard and are included for information onlyfollowing the nonmandatory appendices.Requests for PVHO Cases shall provide the following:(
33、a) Statement of Need. Provide a brief explanation of the need for the revision(s) or addition(s).(b) Background Information. Provide background information to support the revision(s) or addi-tion(s) including any data or changes in technology that form the basis for the request that willallow the Co
34、mmittee to adequately evaluate the proposed revision(s) or addition(s). Sketches,tables, figures, and graphs should be submitted as appropriate. When applicable, identify anypertinent paragraphs in the standard that would be affected by the revision(s) or addition(s)and paragraphs in the standard th
35、at reference the paragraphs that are to be revised or added.Furthermore, the proposed Case should be written as a question and a reply in the same formatas existing Cases. Requests for PVHO Cases should also indicate the applicable edition to whichthe proposed Case applies.viiErrata. ASME issues err
36、ata (corrections to errors introduced in the Standard during the publish-ing process; e.g., typographical errors, misspellings, grammatical errors, incorrect publication ofrevisions). Once approved, errata are posted on the ASME PVHO Committee Web page athttp:/cstools.asme.org/ and are subsequently
37、published with the next edition of the Standard.Attending Committee Meetings. The PVHO Standards Committee regularly holds meetings,which are open to the public. Persons wishing to attend any meeting should contact the Secretaryof the PVHO Standards Committee.viiiASME PVHO-22012SUMMARY OF CHANGESFol
38、lowing approval by the PVHO Committee and ASME, and after public review,ASME PVHO-22012 was approved by the American National Standards Institute onDecember 22, 2012.ASME PVHO-22012 has been revised in its entirety.SPECIAL NOTE:The Cases to PVHO-2 follow the last page of this Edition. However, they
39、are not part of theStandard itself.ixINTENTIONALLY LEFT BLANKxASME PVHO-22012SAFETY STANDARD FOR PRESSURE VESSELS FORHUMAN OCCUPANCY: IN-SERVICE GUIDELINESSection 1General1-1 INTRODUCTION AND SCOPE(a) This Standard provides technical requirementsand guidelines for the operation and maintenance ofPVH
40、Os and PVHO systems that were designed, con-structed, tested, and certified in accordance withASME PVHO-1, Safety Standard for Pressure Vessels forHuman Occupancy.(b) This Standard provides technical criteria for theuser to establish the serviceability of a PVHO acrylicwindow under its specific envi
41、ronmental service condi-tions. Windows in protected environments as well asthose in severe environments are addressed. Judicioususe of this Standard will allow the user and/or thejurisdictional authority to determine when a PVHOacrylic window requires replacement.1-2 RESPONSIBILITIES AND JURISDICTIO
42、NALCONSIDERATIONS1-2.1 Users ResponsibilitiesThe PVHO and PVHO systems user shall provide thedesigner with information regarding the service condi-tions that the PVHO and PVHO systems may encounterduring their service life. The user shall protect the PVHOand its systems from hazards, and ensure they
43、 are usedwithin their design limitations. It is the user, and notthe designer or fabricator, who is responsible fordetermining the safe service life in accordance with thetechnical criteria and guidelines herein. The user isresponsible for retaining all documentation for eachPVHO and its associated
44、systems, and shall establish aprogram of periodic inspection to determine the needfor repair or replacement of any part, in accordance withthe requirements listed in this Standard. For windowrepair and replacement requirements, refer to Section 2,Viewports.1-2.2 Jurisdictional ConsiderationsThe oper
45、ation of each PVHO is typically governedunder specific rules of the jurisdiction in which it is1operated. (Examples include, but are not necessarily lim-ited to, the state, the Food and Drug Administration,and the U.S. Coast Guard.) This Safety Standard isintended to complement the jurisdictional re
46、quirements(i.e., to provide guidance to both users and jurisdictionalauthorities in regard to in-service requirements for thePVHO, acrylic windows, and PVHO systems). Theresponsibility for compliance with jurisdictional in-ser-vice requirements, which may become invoked as aresult of the technical c
47、riteria and guidelines as set forthherein, lies with the user.1-3 IN-SERVICE EVALUATIONS, REPAIRS, ANDMODIFICATION OF PVHOs1-3.1 PVHO Windows and ViewportsThe owner shall be responsible for ensuring that in-service viewport evaluations, window replacements,and inspections are performed in accordance
48、 with thisStandard.(a) PVHO acrylic windows shall be evaluated and, ifnecessary, repaired per subsections 2-4 through 2-6 ofthis Standard.(b) The service life of acrylic windows shall be deter-mined in accordance with para. 2-4.3 and subsection 2-7of this Standard.(c) Replacement windows shall meet
49、PVHO designrequirements for the viewport.(d) Viewports in which PVHO acrylic windows areinstalled shall be evaluated and, if necessary, refurbishedper subsection 2-4 of this Standard.1-3.2 Pressure Boundary (Except for Windows)When evidence of a flaw is detected or a modificationof a PVHO pressure boundary is planned, the ownershall be responsible for ensuring that the PVHO is evalu-ated and repaired, replaced, or modified in accordancewith the requirements of this Standard, applicable codes,and appropriate jurisdictional authorities.(a) In-service flaw evaluation tech
