BS EN 12119-1997 Plastics piping systems - Polyethylene (PE) valves - Test method for resistance to thermal cycling《塑料管道系统 聚乙烯(PE)阀 耐力热循环抗性的测试方法》.pdf

《BS EN 12119-1997 Plastics piping systems - Polyethylene (PE) valves - Test method for resistance to thermal cycling《塑料管道系统 聚乙烯(PE)阀 耐力热循环抗性的测试方法》.pdf》由会员分享，可在线阅读，更多相关《BS EN 12119-1997 Plastics piping systems - Polyethylene (PE) valves - Test method for resistance to thermal cycling《塑料管道系统 聚乙烯(PE)阀 耐力热循环抗性的测试方法》.pdf（8页珍藏版）》请在麦多课文档分享上搜索。

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12119 : 1997 BS 278

2、2 : Part 11 : Method 1133E : 1997 The European Standard EN 12119 : 1997 has the status of a British Standard ICS 23.060.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plastics piping systems Polyethylene (PE) valves Test method for resistance to thermal cyclingThis British

3、 Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 December 1997 BSI 1997 ISBN 0 580 28740 8 BS EN 12119 : 1997 Amendments issued since publication Amd. No. Date Tex

4、t affected National foreword This British Standard is the English language version of EN 12119 : 1997 published by the European Committee for Standardization (CEN). The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping systems and components, which has

5、the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list o

6、f organizations represented on this committee can be obtained on request to its secretary. This European Standard is also incorporated into BS 2782 Methods of testing plastics : Part 11 Thermoplastics pipes, fittings and valves, as Method 1133E : 1997, for association with related test methods for p

7、lastics materials and plastics piping systems. It is also for use for the revision or amendment of other national standards as practicable, but it should not be presumed to apply to any existing standard or specification which contains or makes reference to a different test method until that standar

8、d/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the se

9、ction entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. NOTE. In 4.2, and hence clause 2, reference is made to EN 837-1 : 1994. The 1994 document is prEN 837-1, which remains the relevant public document for reference, pen

10、ding publication of a first edition of EN 837-1. Warning note. This British Standard, which is identical with EN 12119 : 1997, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriat

11、e safety precautions and the method should be operated only by trained personnel. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 4, an inside ba

12、ck cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Memb

13、ers. Ref. No. EN 12119 : 1997 E EUROPEAN STANDARD EN 12119 NORME EUROPE ENNE EUROPA ISCHE NORM May 1997 ICS 23.060.01 Descriptors: Plastic tubes, polyethylene, valves, thermal cycling tests, thermal resistance English version Plastics piping systems Polyethylene (PE) valves Test method for resistanc

14、e to thermal cycling Syste mes de canalisations en plastique Robinets en polye thyle ne (PE) Methode dessai de re sistance aux cycles thermiques Kunststoff-Rohrleitungssysteme Armaturen aus Polyethylen (PE) Pru fverfahren fu r die Besta ndigkeit bei Temperaturwechsel This European Standard was appro

15、ved by CEN on 1997-03-28. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stan

16、dards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to

17、 the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Unit

18、ed Kingdom.Page 2 EN 12119 : 1997 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 155, Plastics piping systems and ducting systems, the Secretariat of which is held by NNI. The material-dependent parameters and/or performance requirements are incorporated in

19、the System Standard(s) concerned. This standard is one of a series of standards on test methods which support System Standards for plastics piping systems and ducting systems. This European Standard shall be given the status of a national standard, either by publication of an identical text or by en

20、dorsement, at the latest by November 1997, and conflicting national standards shall be withdrawn at the latest by November 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria,

21、Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test pieces 3 6 Procedu

22、re 3 7 Test report 4Page 3 EN 12119 : 1997 BSI 1997 1) 1 bar = 10 5 N/m 2 = 0,1 MPa. 1 Scope This standard specifies a test method for the resistance of valves to thermal cycling. This standard is applicable to polyethylene (PE) valves and valves with PE spigot ends having a nominal outside diameter

23、 greater than 63 mm and intended for the transport of fluids. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed herea

24、fter. For dated references, subsequent amendments to, or revisions of, any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 837-1 : 1994 Pressure gauges Pa

25、rt 1: Bourdon tube pressure gauges Dimensions, metrology, requirements and testing EN 28233 : 1991 Thermoplastics valves Torque Test method ISO 5208 : 1993 Industrial valves Pressure testing of valves 3 Principle A valve, initially pressurized with air to 6 bar 1) is isolated and subjected to cyclic

26、 thermal stresses and the consequent pressure changes are measured. The tightness is checked and actuation torque measured before and after the pressure test. NOTE. It is assumed that the following test parameters are set by the standard making reference to this standard: a) the sampling procedure (

27、see 5.1); b) the number of test pieces to be used (see 5.2); c) any test conditions, e.g. test pressure, test duration, which differ from those given in ISO 5208 : 1993 (see 6.2). 4 Apparatus 4.1 Temperature-controlled enclosure, in which the temperature can be time programmed at constant or variabl

28、e values between220 C and +60 C, to within 2 C. The temperature gradient shall be capable of being set at about 1 C/min. 4.2 Pressure plotter(s), with a range and scale suitable for the test pressure required for the valve to be tested, of accuracy class 1,5 in accordance with EN 837-1 : 1994. 4.3 C

29、ompressed air supply, capable of providing the required test pressure (see 6.4). 4.4 Pipework, equipped with valves enabling the test piece to be connected to the pressure plotter(s) and to the compressed air supply and the test piece and plotter assembly as a whole to be isolated from the air suppl

30、y. The air supply valves shall enable pressure to be applied gradually and smoothly. 5 Test pieces 5.1 Preparation The test piece shall comprise a complete valve obtained by sampling in accordance with the referring standard. The valve ends shall be fitted with plugging devices which enable the test

31、 to be conducted in accordance with clause 6. Immediately before testing in accordance with clause 6, the test piece shall be conditioned at (23 2) C for at least 24 h. 5.2 Number The number of test pieces shall be as specified in the referring standard. 6 Procedure 6.1 Close the valve and place it

32、in the temperature-controlled enclosure at (23 2) C. 6.2 Measure and record the actuation torque in accordance with EN 28233 : 1991. Check and record the leaktightness when the valve is half-open (shell test) and when it is closed (obturator tightness test) by testing in accordance with ISO 5208 : 1

33、993 and any associated test conditions specified in the referring standard. 6.3 Connect one end of the test piece to the compressed air supply, the other end of the test piece not being closed. 6.4 Raise the pressure gradually in the system to achieve 6 bar 2 % within 30 s. 6.5 Wait for 30 min for t

34、he pressure to stabilize. 6.6 Isolate the test piece from the compressed air while keeping it connected to the corresponding pressure plotter.Page 4 EN 12119 : 1997 BSI 1997 6.7 While testing in accordance with 6.8 and 6.9: a) record pressures during the cycles, upstream and downstream from the obtu

35、rating element of the valve; b) record the temperature at which a leak appears, if any, as well as the pressure changes corresponding to the duration of a cycle; c) locate and record the position of any leaks. 6.8 Set the temperature-controlled enclosure so as to obtain temperature extremes of (220

36、2) C and (60 2) C, each of these temperatures being kept constant for periods of 3 h separated by the time necessary to change the temperature at a rate of about 1 C/min (see 4.1). 6.9 Keep the test piece in the enclosure for 10 cycles, beginning with a temperature increase. 6.10 After completion of

37、 the cycles, condition the test piece at (23 2) C for 24 h. Repeat the procedure given in 6.2. 7 Test report The test report shall include the following information: a) the reference to this standard and to the referring standard; b) the complete identification of the test piece; c) the type(s) of P

38、E material(s) and of other material(s), if applicable; d) the nominal size of the valve; e) the number of test pieces tested; f) the pressure(s) recorded during the cycle (see 6.7); g) if applicable, the temperature at which any leaks appeared and their position(s); h) the actuation torques before a

39、nd after the thermal cycling; i) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard; j) the date of the test.blankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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