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1、UL 21LP-Gas HoseUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULThis PDF Standard downloaded from DECEMBER 20, 2007 UL 21tr3Underwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for LP-Gas Hose,
2、UL 21Tenth Edition, Dated December 20, 2007Summary of TopicsThe tenth edition of the Standard for LP-Gas Hose, UL 21, has been issued to reflect the latestANSI approval date and to incorporate formatting and editorial revisions.UL Standards for Safety are developed and maintained in the Standard Gen
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21、nts in this Standard are 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 effe
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24、after the effective date, and understanding of this should be signified in writing.Copyright 2007 Underwriters Laboratories Inc.This Standard consists of pages dated as shown in the following checklist:PageDate1-18 . December 20, 2007This PDF Standard downloaded from No Text on This PageUL COPYRIGHT
25、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 20, 20071UL 21Standard for LP-Gas HoseANSI/UL 21-2007The First and Second editions were titled Hose for Conducting LP-Gas.First Edition September, 1955Second Edition March, 1964Third Edition Novemb
26、er, 1967Fourth Edition February, 1973Fifth Edition August, 1978Sixth Edition April, 1980Seventh Edition June, 1986Eighth Edition December, 1991Ninth Edition June, 1995Tenth EditionDecember 20, 2007The most recent designation of ANSI/UL 21 as an American National Standard (ANSI) occurred on December
27、18, 2007. The ANSI approval for this standard does not include the Cover Page, Transmittal Pages, or Title Page.This ANSI/UL Standard for Safety, which consists of the Tenth edition, with revisions through December 20, 2007, is under continuous maintenance, whereby each revision is ANSI approved upo
28、n publication.An effective date included as a note immediately following certain requirements is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard.Revisions of this Standard will be made by issuing revised or additional pages bearing their date of issue.
29、 A UL Standard is current 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. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Prop
30、osals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at .COPYRIGHT 1978, 2007 UNDERWRITERS LABORATORIES INC.DECEMBER 20, 2007LP-GAS HOSE - UL 2117This PDF Standard downloaded from No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED
31、FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope . .52 General . .52.1 Units of measurement . .52.2 Undated references . .5CONSTRUCTION3 Tube and Cover . .64 Reinforcement . .65 Inside Diameter . .66 Thickness of Tube or Cover . .7PERFORMANCE7 Proof-Pres
32、sure Test . .77.1 General . .77.2 Apparatus . .87.3 Method . .88 Hydrostatic Strength Test . .88.1 General . .88.2 Apparatus . .88.3 Method . .99 Adhesion Test . .99.1 General . .99.2 Apparatus . .99.3 Method . .1010 Tensile Strength and Elongation Tests . .1010.1 General . .1010.2 Apparatus . .1010
33、.3 Method . .1111 Accelerated Air-Oven Aging Test . .1111.1 General . .1111.2 Method . .1212 Ozone Exposure . .1212.1 General . .1212.2 Apparatus . .1212.3 Method . .1213 Repeated Bending Test . .1313.1 General . .1313.2 Apparatus . .1313.3 Method . .1314 Repeated Bending Proof Pressure Test . .1414
34、.1 General . .1414.2 Apparatus . .1414.3 Method . .1415 Permeation Test . .1415.1 General . .1415.2 Apparatus . .14This PDF Standard downloaded from 15.3 Method . .1416 Immersion Tests of Rubber Tube and Cover . .1516.1 Tensile strength and ultimate elongation . .1516.2 Volumetric swelling . .1617 L
35、ow Temperature Test . .1717.1 General . .1717.2 Apparatus . .17MANUFACTURING AND PRODUCTION TESTS18 General . .18MARKING19 General . .18INTRODUCTION1 Scope1.1 These requirements cover hose in sizes up to and including a nominal internal diameter of 4 in (102 mm) for conducting liquefied petroleum ga
36、s intended to be installed in closed systems in compliance with the Standard of the National Fire Protection Association for the Storage and Handling of Liquefied Petroleum Gases, NFPA 58. The hose is made for a maximum working pressure of 350 pounds per square inch gauge (psig) (2400 kPa). Hose in sizes larger than 2 in (50.8 mm) is not intended for use o
