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1、UL 252ISBN 0-7629-0841-6Compressed Gas RegulatorsThis PDF Standard downloaded from OCTOBER 10, 2003 UL 252tr1Underwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for Compressed Gas Regulators, UL 252Eighth Edition, Dated October 10, 2003SUMMARY OF TOPI
2、CSThis new edition is a periodic re-issuance to ensure that ULs Standards remain up-to-date with regard to format and editorial issues such as renumbering, repaginating, correction of editorial errors, correction of cross-references and updating titles of referenced Standards. Revisionsto UL 252 ref
3、lect the discontinued use of cadmium plating in compressed gas regulator accessories and the replacement of ASTM No. 3 Swelling Oil with IRM 903 as stated in the bulletin dated April 9, 2003.UL Standards for Safety are developed and maintained in the Standard Generalized Markup Language (SGML). SGML
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5、ages (on which no requirements have been changed) may be included in revision pages due to relocation of existing text and reformatting of the Standard.The following table lists the future effective date with the corresponding reference.Future Effective DateReferenceApril 10, 2005Paragraphs 5.5 and
6、5.6The new and/or revised requirements are substantially in accordance with ULs Bulletin(s) on this subject dated April 9, 2003. The bulletin(s) is now obsolete and may be discarded.As indicated on the title page (page 1), this UL Standard for Safety is an American National Standard. Attention is di
7、rected to the note on the title page of this Standard outlining the procedures to be followed to retain the approved text of this ANSI/UL Standard.As indicated on the title page (page1), this UL Standard for Safety has been adopted by the Department of Defense.The master for this Standard at ULs Nor
8、thbrook Office is the official document insofar as it relates to a UL service and the compliance of a product with respect to the requirements for that product and service, or if there are questions regarding the accuracy of this Standard.ULs Standards for Safety are copyrighted by UL. Neither a pri
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10、perty of UL.All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL.OCTOBER 10, 2003 UL 252tr3This PDF Standard downloaded fr
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22、 now in effect, except for those paragraphs, sections, tables, figures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located a
23、fter the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice.New product submittals made prior to a specified future effective date will be judged under all of the requirements in this Standard including those requirements with a specified future effective date, unless the applicant speci
24、fically requests that the product be judged under the current requirements. However, ifthe applicant elects this option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Listing, Recognition, and Follow-Up Services after the e
25、ffective date, and understanding of this should be signified in writing.Copyright 2003 Underwriters Laboratories Inc.This Standard consists of pages dated as shown in the following checklist:PageDate1-18 . October 10, 2003SA1-SA8 . October 10, 2003A1-A2 . October 10, 2003SR1-SR2 . October 10, 2003tr
26、OCTOBER 10, 2003 UL 252This PDF Standard downloaded from No Text on This PageOCTOBER 10, 20031UL 252ANSI/UL 252-2003Standard for Compressed Gas RegulatorsThe first and second editions were titled Standard for Pressure Regulators or Reducing Valves and numbered UL 252C. The third and fourth editions
27、were titled Gas Pressure Regulators.First Edition March, 1928Second Edition May, 1951Third Edition August, 1960Fourth Edition May, 1973Fifth Edition December, 1979Sixth Edition June, 1984Seventh Edition April, 1996Eighth EditionOctober 10, 2003The most recent designation of ANSI/UL 252 as an America
28、n National Standard(ANSI) occurred on September 2, 2003.This ANSI/UL Standard for Safety, which consists of the Eighth edition with revisions through October 10, 2003 is under continuous maintenance, whereby each revision is ANSI approved upon publication. Comments or proposals for revisions on any
29、part of the Standard may be submitted to UL at any time. Written comments are to be sent to UL-SC Standards Department, 1655 Scott Blvd, Santa Clara, CA 95050.An effective date included as a note immediately following certain requirements is one established by Underwriters Laboratories Inc.The Depar
30、tment of Defense (DoD) has adopted UL 252 on September 26, 1988. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption.Revisions of this Standard will be made by issuing revised or additional pages bearing their date of issue. A UL Standard is curren
31、t only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements.ISBN 0-7629-0841-6COPYRIGHT 1979, 2003 UNDERWRITERS LABORATORIES INC.OCTOBER 10, 2003COMPRESSED GAS REGULATORS - UL 2523This PDF
32、Standard downloaded from No Text on This PageCONTENTSFOREWORD . .6INTRODUCTION1 Scope . .72 General . .72.1 Components . .72.2 Units of measurement . .82.3 Undated references . .83 Glossary . .8CONSTRUCTION4 Assembly . .95 Materials . .96 Connections . .107 Accessories . .11PERFORMANCE8 General . .1
33、19 Seat- and External-Leakage Test . .1110 Excess-Pressure Test . .1311 Endurance Test . .1312 Volume-Change and Weight-Loss Tests . .1412.1 General . .1412.2 Tests using n-Hexane and IRM 903 Oil . .1412.3 Tests using liquid MPS . .1513 Accelerated-Aging Test . .1614 Comparative Corrosion Tests . .1
34、614.1 General . .1614.2 Tests in the presence of salt spray (fog) . .1614.3 Tests in the presence of moist hydrogen sulfide-air mixture . .1714.4 Tests in the presence of moist sulfur dioxide-carbon dioxide-air mixture . .17MANUFACTURING AND PRODUCTION TESTS15 General . .17MARKING AND INSTRUCTIONS16
35、 General . .1817 Instructions . .18OCTOBER 10, 2003COMPRESSED GAS REGULATORS - UL 2525This PDF Standard downloaded from SUPPLEMENT SA - OXYGEN AND ACETYLENE WELDING REGULATORS FOR USE UNDER FEDERAL AGENCY REGULATIONSINTRODUCTIONSA1 Scope . .SA1SA2 Glossary . .SA1CONSTRUCTIONSA3 General . .SA1SA4 Con
36、nections . .SA2SA5 Relief Valves . .SA3SA6 Pressure Gauges . .SA3PERFORMANCESA7 General . .SA3SA8 Performance Characteristics Test . .SA4SA9 Pressure Regulation Test . .SA4SA10 Flow Regulation Test . .SA4SA11 Static Increment (Lock-Up) Test . .SA5SA12 Flow Capacity Test . .SA5SA13 Proof Pressure Tes
37、t . .SA6SA14 Burst Pressure Test . .SA6SA15 Endurance Test . .SA6SA16 Immersion Tests . .SA7APPENDIX AStandards for Components. A1No Text on This PageOCTOBER 10, 2003COMPRESSED GAS REGULATORS - UL 2527This PDF Standard downloaded from FOREWORDA. This Standard contains basic requirements for products covered by Unde
