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1、UL 51ISBN 0-7629-0793-2Power-Operated Pumps for Anhydrous Ammonia and LP-GasUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULThis PDF Standard downloaded from UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITH
2、OUT PERMISSION FROM ULNOVEMBER 4, 2002 UL 51tr1Underwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for Power-Operated Pumps for Anhydrous Ammonia and LP-Gas, UL 51Ninth Edition, Dated November 4, 2002UL Standards for Safety are developed and maintaine
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21、fied future effective date, unless the applicant specifically requests that the product be judged under the current requirements. However, if the 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 L
22、isting, and Follow-Up Services after the effective date, and understanding of this should be signified in writing.Copyright 2002 Underwriters Laboratories Inc.This Standard consists of pages dated as shown in the following checklist:PageDate1-18 . November 4, 2002A1-A2 . November 4, 2002UL COPYRIGHT
23、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULNovember 4, 20021UL 51Standard for Power-Operated Pumps for Anhydrous Ammonia and LP-GasThe first edition was titled Power-Operated Pumps for LP-Gas. The second, third, and fourth editions were titled Pumps
24、 for Anhydrous Ammonia and LP-Gas.First Edition March, 1956Second Edition September, 1959Third Edition November, 1969Fourth Edition September, 1972Fifth Edition September, 1974Sixth Edition March, 1980Seventh Edition October, 1992Eighth Edition November, 1995Ninth EditionNovember 4, 2002An effective
25、 date included as a note immediately following certain requirements is one established by Underwriters Laboratories Inc.Revisions of this Standard will be made by issuing revised or additional pages bearing their date of issue. A UL Standard is current only if it incorporates the most recently adopt
26、ed revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements.ISBN 0-7629-0793-2COPYRIGHT 1974, 2002 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL2PO
27、WER-OPERATED PUMPS FOR ANHYDROUS AMMONIA AND LP-GAS - UL 51NOVEMBER 4, 2002This PDF Standard downloaded from No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULNOVEMBER 4, 2002POWER-OPERATED PUMPS FOR ANHYDROUS AMMONIA AND LP
28、-GAS - UL 513CONTENTSFOREWORD . .4INTRODUCTION1 Scope . .52 General . .52.1 Components . .52.2 Units of measurement . .62.3 Undated references . .63 Glossary . .6CONSTRUCTION4 Assembly . .75 Materials . .76 Bodies, Covers, and Heads . .97 Strainers . .98 Springs . .109 Bypass Valves . .1010 Relief V
29、alves . .1011 Guards . .1012 Pipe Connections . .11PERFORMANCE13 General . .1114 Deformation Test . .1115 Leakage Test . .1216 Endurance Test . .1317 Bypass Valve Test . .1318 Hydrostatic Strength Test . .1319 10-Day Moist Ammonia Air Stress Cracking Test . .1420 Tests for Synthetic Rubber Parts . .
30、1420.1 General . .1420.2 Volume change test . .1520.3 Weight loss test . .16MANUFACTURING AND PRODUCTION TESTS21 General . .16MARKINGS22 Details . .17APPENDIX AStandards for Components. A1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL4POWER
31、-OPERATED PUMPS FOR ANHYDROUS AMMONIA AND LP-GAS - UL 51NOVEMBER 4, 2002This PDF Standard downloaded from FOREWORDA. This Standard contains basic requirements for products covered by Underwriters Laboratories Inc. (UL) under its Follow-Up Service for this category within the limitations given below
32、and in the Scope section of this Standard. These requirements are based upon sound engineering principles, research, records of tests and field experience, and an appreciation of the problems of manufacture, installation, and use derived from consultation with and information obtained from manufactu
33、rers, users, inspection authorities, and others having specialized experience. They are subject to revision as further experience and investigation may show is necessary or desirable.B. The observance of the requirements of this Standard by a manufacturer is one of the conditions of the continued co
34、verage of the manufacturers product.C. A product which complies with the text of this Standard will not necessarily be judged to comply with the Standard if, when examined and tested, it is found to have other features which impair the level of safety contemplated by these requirements.D. A product
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