1、UL 1474ISBN 0-7629-1011-9Adjustable Drop Nipples forSprinkler SystemsUnderwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for Adjustable Drop Nipples for Sprinkler Systems, UL 1474Fifth Edition, Dated September 27, 2004Summary of TopicsThis new edition
2、 of UL 1474 is a periodic re-issuance to ensure that ULs Standards remain upto date with regard to format and editorial issues such as numbering, pagination and crossreferencing. This new edition also includes revisions/clarifications to requirements in Section 5,Table 11.1 and 11.2.The requirements
3、 are substantially in accordance with ULs Bulletin(s) on this subject dated August 5,2004. The bulletin(s) is now obsolete and may be discarded.The UL Foreword is no longer located within the UL Standard. For information concerning the use andapplication of the requirements contained in this Standar
4、d, the current version of the UL Foreword islocated on ULStandardsInfoNet at: http:/ master for this Standard at ULs Northbrook Office is the official document insofar as it relates to aUL service and the compliance of a product with respect to the requirements for that product and service,or if the
5、re are questions regarding the accuracy of this Standard.ULs Standards for Safety are copyrighted by UL. Neither a printed copy of a Standard, nor the distributiondiskette for a Standard-on-Diskette and the file for the Standard on the distribution diskette should bealtered in any way. All of ULs St
6、andards and all copyrights, ownerships, and rights regarding thoseStandards shall remain the sole and exclusive property of UL.All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form by any means, electronic, mechanical photocopying
7、, recording, or otherwisewithout prior permission of UL.Revisions of UL Standards for Safety are issued from time to time. A UL Standard for Safety is currentonly if it incorporates the most recently adopted revisions.UL provides this Standard as is without warranty of any kind, either expressed or
8、implied, including butnot limited to, the implied warranties of merchantability or fitness for any purpose.In no event will UL be liable for any special, incidental, consequential, indirect or similar damages,including loss of profits, lost savings, loss of data, or any other damages arising out of
9、the use of or theinability to use this Standard, even if UL or an authorized UL representative has been advised of thepossibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid forthis Standard, regardless of the form of the claim.UL will attempt to answer
10、support requests concerning electronic versions of its Standards. However, thissupport service is offered on a reasonable efforts basis only, and UL may not be able to resolve everysupport request. UL supports the electronic versions of its Standards only if they are used under theconditions and ope
11、rating systems for which it is intended. ULs support policies may change fromtime-to-time without notification.SEPTEMBER 27, 2004 UL 1474 tr1UL reserves the right to change the format, presentation, file types and formats, delivery methods andformats, and the like of both its printed and electronic
12、Standards without prior notice.Purchasers of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and holdUL harmless from and against any loss, expense, liability, damage, claim, or judgement (includingreasonable attorneys fees) resulting from any error or deviation intro
13、duced while purchaser is storing anelectronic Standard on the purchasers computer system.If a single-user version electronic Standard was purchased, one copy of this Standard may be stored onthe hard disk of a single personal computer, or on a single LAN file-server or the permanent storagedevice of
14、 a multiple-user computer in such a manner that this Standard may only be accessed by one userat a time and for which there is no possibility of multiple concurrent access.If a multiple-user version electronic Standard was purchased, one copy of the Standard may be stored ona single LAN file-server,
15、 or on the permanent storage device of a multiple-user computer, or on an Intranetserver. The number of concurrent users shall not exceed the number of users authorized.Electronic Standards are intended for on-line use, such as for viewing the requirements of a Standard,conducting a word search, and
16、 the like. Only one copy of the Standard may be printed from eachsingle-user version of an electronic Standard. Only one copy of the Standard may be printed for eachauthorized user of a multiple-user version of an electronic Standard. Because of differences in thecomputer/software/printer setup used
17、 by UL and those of electronic Standards purchasers, the printedcopy obtained by a purchaser may not look exactly like the on-line screen view or the printed Standard.An employee of an organization purchasing a UL Standard can make a copy of the page or pages beingviewed for their own fair and/or pr
18、actical internal use.The requirements 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 theaffected item. The prior text for requirements that have been rev
19、ised and that have a future effective dateare located after 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 therequirements in this Standard including those requirements with a speci
20、fied future effective date, unlessthe applicant specifically 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 thisStandard will be required as a condition of continued List
21、ing and Follow-Up Services after the effectivedate, and understanding of this should be signified in writing.Copyright 2004 Underwriters Laboratories Inc.This Standard consists of pages dated as shown in the following checklist:Page Date1-12.September 27, 2004SEPTEMBER 27, 2004 UL 1474tr2SEPTEMBER 2
22、7, 20041UL 1474Standard for Adjustable Drop Nipples for Sprinkler SystemsFirst Edition October, 1977Second Edition February, 1987Third Edition July, 1990Fourth Edition January, 1996Fifth EditionSeptember 27, 2004An effective date included as a note immediately following certain requirementsis one es
23、tablished by Underwriters Laboratories Inc.Revisions of this Standard will be made by issuing revised or additional pagesbearing their date of issue. A UL Standard is current only if it incorporates themost recently adopted revisions, all of which are itemized on the transmittal noticethat accompani
24、es the latest set of revised requirements.ISBN 0-7629-1011-9COPYRIGHT 1977, 2004 UNDERWRITERS LABORATORIES INC.SEPTEMBER 27, 2004ADJUSTABLE DROP NIPPLES FOR SPRINKLER SYSTEMS - UL 14742No Text on This PageCONTENTSINTRODUCTION1 Scope .42 Components 43 Unit of Measurements .44 Undated References 5CONS
25、TRUCTION5 General 56 Metallic Materials .5PERFORMANCE7 Hydrostatic Pressure Test 58 Mechanical Strength Test 69 High Temperature Exposure Test .610 Vibration Test .711 Flow Characteristics 711.1 Discharge coefficient .711.2 Equivalent length 812 Salt Spray Corrosion Test .913 Elastomeric Parts Test
26、.914 Freezing Test 10MARKING15 General 10INSTRUCTIONS16 Installation Instructions 11SEPTEMBER 27, 2004 ADJUSTABLE DROP NIPPLES FOR SPRINKLER SYSTEMS - UL 1474 3INTRODUCTION1 Scope1.1 This standard covers adjustable pipe nipples intended for use with sprinklers to permit adjustment ofthe distance of
27、the sprinkler from the sprinkler system branch line.1.2 The products covered by this standard are intended for use in sprinkler systems installed inaccordance with the Standard for Installation of Sprinkler Systems, NFPA 13; Standard for the Installationof Sprinkler Systems in Residential Occupancie
28、s up to and including Four Stories in Height, NFPA 13R;and Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings andManufactured Homes, NFPA 13D.2 Components2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with therequiremen
29、ts for that component.2.2 A component is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this standard, orb) Is superseded by a requirement in this standard.2.3 A component shall
30、 be used in accordance with its rating established for the intended conditions ofuse.2.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures notexceeding
31、 specified limits, and shall be used only under those specific conditions.3 Unit of Measurements3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.SEPTEMBER 27, 2004ADJUSTABLE DROP NIPPLES FOR SPRINKLER SYSTEMS - UL 147444 Undat
32、ed References4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.CONSTRUCTION5 General5.1 An adjustable drop nipple shall be constructed for a minimum rated pressure of 175 psig
33、 (1.21 Mpa)5.2 The inlet shall have at least 1 inch size male or female NPT pipe threads in accordance with theStandard for Pipe Threads, General Purpose (Inch), (Revision and Redesignation of ASME/ANSI B2.1)B1.20.1, or at least 3/4 nominal 0.875 inches (22.2 mm) OD copper tubing. The outlet shall h
34、ave 1/2, 3/4or 1 inch female NPT pipe threads. Drop nipples intended for use in installations where pipe threads otherthan NPT type threads are used shall be permitted provided the threads or connections are compatiblewith a national standard.5.3 Adjustable drop nipples shall have provision for rest
35、raining the outlet end from movement duringinstallation of a sprinkler without damaging the components used to effect the seal, or without destroyingthe integrity of the seal.5.4 An adjustable drop nipple shall have a means to limit maximum and minimum length.6 Metallic Materials6.1 A pressure retai
36、ning part of an adjustable drop nipple constructed of ferrous metal shall have a wallthickness of not less than 0.109 inch (2.76 mm).6.2 When dissimilar metals are used in an adjustable drop nipple in a configuration or in a proximity thatresults in galvanic corrosion, the adjustable drop nipple sha
37、ll be subjected to the Salt Spray CorrosionTest, Section 12.PERFORMANCE7 Hydrostatic Pressure Test7.1 When tested as specified in 7.2, an adjustable drop nipple shall show no evidence of distortion,leakage, or change in length.7.2 A total of eight samples, representative of the construction of vario
38、us types and ratings, are to besubjected to this test. Each test sample is to be fitted with pipe plugs, filled with water in such a manneras to exclude all air, and connected to a hydrostatic pressure source. The sample is to be adjusted to itsshortest position, the hydrostatic pressure increased t
39、o five times the rated working pressure of thesample, held for 1 minute, and:a) When the product is not intended to be adjusted under service pressure, the test pressure isto be reduced to zero, the sample adjusted to its longest position, and the test pressureincreased to five times the rated worki
40、ng pressure and held for 1 minute; orSEPTEMBER 27, 2004 ADJUSTABLE DROP NIPPLES FOR SPRINKLER SYSTEMS - UL 1474 5b) When the product is intended to be adjusted under service pressure, the test pressure is tobe reduced to the rated working pressure of the product, the sample adjusted to its longestpo
41、sition while under pressure, and the test pressure increased to five times the rated workingpressure and held for 1 minute; andc) The test pressure is then to be reduced to the rated working pressure of the product, thesample adjusted to its shortest position while under pressure, and the test press
42、ure thenincreased to five times the rated working pressure and held for 1 minute.8 Mechanical Strength Test8.1 An adjustable drop nipple incorporating mechanical stops subject to torsional forces shall withstand atorque of 60 pound-feet (81 Nm) applied to the outlet without deformation, fracture, or
43、 leakage whentested as specified in 8.2 8.4.8.2 The base of the sample is to be secured and a 60 pound-foot (81 Nm) torque is then to be appliedat the outlet for 10 seconds against each stop.8.3 Following application of the torque, the sample is to be examined for deformation or fracture.8.4 The tes
44、t sample is then to be fitted with pipe plugs, filled with water in such a manner as to excludeall air, and connected to a hydrostatic pressure source. The hydrostatic pressure is to be increased to therated working pressure of the sample. The pressure is to be applied for one minute with the drop n
45、ipplepositioned against each stop.9 High Temperature Exposure Test9.1 When tested as specified in 9.2, an adjustable drop nipple shall show no evidence of distortion orleakage.9.2 Two samples are to be prepared and subjected to a hydrostatic pressure of 500 psig (3.45 MPa) inaccordance with 7.2. The
46、 samples are then to be allowed to dry and then exposed to an ambienttemperature in accordance with Table 9.1 for 90 days. Following this exposure, the samples are to beindividually subjected to a hydrostatic pressure of 500 psig (3.45 MPa) for 1 minute.SEPTEMBER 27, 2004ADJUSTABLE DROP NIPPLES FOR
47、SPRINKLER SYSTEMS - UL 14746Table 9.1Test temperaturesHighest temperature rating of sprinkler withwhich adjustable drop nipple is to be installedTemperatureclassificationTest temperatureF (C) F (C)135 225 (57 107)Ordinary andintermediate 175 (79)250 300 (121 149) High 250 (121)325 375 (163 191) Extr
48、a high 300 (149)10 Vibration Test10.1 When tested as specified in 10.2, an adjustable drop nipple shall show no evidence of leakage,distortion, or change in length.10.2 Two samples are to be prepared and subjected to a hydrostatic pressure of 500 psig (3.45 MPa) inaccordance with 7.2. The samples ar
49、e to be extended to their intermediate position, locked, filled withwater, and mounted in the pendant position on a test fixture attached to the table of a vibration machine.The samples are to then be pressurized with air at a pressure of 175 psig (1.21 MPa), vibrated verticallyfor 60 hours, and then vibrated horizontally for 60 hours. The amplitude of the vibration is to be 0.04 inch(1.02 mm), and the frequency is to be continuously varied between 18 and 37 hertz. When resonance isencountered in e
