1、 STD.BS1 BS EN 12295-ENGL 2000 E 1624669 0853357 344 E BRITISH STANDARD Plastics piping systems - Thermoplastics pipes and associated fittings for hot and cold water - Test method for resistance of joints to pressure cycling The European Standard EN 12295 1999 has the status of a Britkh Standard ICC
2、 23.040.20: 23.040.15 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 12295:ZOOO BS 2782-1 1:Method 1123P:ZOOO STD.BS1 BS EN 12295-ENGL 2000 1624bb9 085L358 280 Amd. No. Date BS EN 12295:ZooO Comments National foreword This British Standard is the official English langua
3、ge version of EN 12295 1999. The UK participation in its preparation was entrusted to Technical Committee PW61, Plastics piping systems and components, which has the responsibility to: - aid enquirers to undeBtand the text; - present to the responsible European committee any enquiries on the - monit
4、or related internationai and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards whic
5、h implement intemationai or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Intemationai Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. WARNING This British Standar
6、d, which is identical with EN 122951999, does not necessary 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 appropriate safety precautions and the method should be operated only by Wed personnel A British S
7、tandard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cov
8、er, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copynght notice displayed in this document inicates when the document was last issued. This British Standard, having been prepared under the direction of the Sector Committee for Materiais and Chemicals, was publish
9、ed under the authority of the Standards Committee and comes into effect on 16 May 2000 0 BSI 052000 ISBN O 580 34926 8 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12295 September I999 ICs 23.040.20; 23.040.45 English version Plastics piping systems - Thermoplastics pipes and associated fitt
10、ings for hot and cold water - Test method for resistance of joints to pressure cycling Systmes de canalisations en plastique - Tubes thermoplastiques et raccords associs pour installation deau chaude et froide sous pression - Mthode dessai de rsistance des assemblages des cycles de pression Kunststo
11、ff-Rohrleitungssysteme - Rohre aus Thermoplasten und zugehrige Formstcke fr Warm- und Kaltwasser - Prfverfahren fr die Bestndigkeit von Verbindungen gegen Druckwechselbeanspruchung This European Standard was approved by CEN on 13 December 1998 CEN members are bound to comply with the CENICENELEC Int
12、ernal 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 sich national standards may be obtained on application to the Central Secretariat or to any CEN memb
13、er. This European Standard exists in three official versions (English, French, German). A version in any other language made by tralslation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as he official versions. CEN members
14、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 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG C
15、OMIT EUROPEN DE NORMALISATION Central Secretariat: rue de Stassart, 36 8-1050 Brussels Q 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 122951999 E STD-BSI BS EN L2295-ENGL 2000 M lib24bb9 085L3b0 939 = Page 2 EN 12295:1999 F
16、oreword This European Standard has been prepared by Technical Committee CENTTC 155, Plastics piping systems and ducting systems, the Secretariat of which is held by NNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsem
17、ent, at the latest by December 1999, and conflicting national standards shall be withdrawn at the latest by March 2000. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, C
18、zech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. The material-dependent parameters and/or performance requirements are incorporated in the System Standard(s) concerned. This
19、 standard is one of a series of standards on test methods which support System Standards for plastics piping systems and ducting systems. O BSI 052000 STD.BS1 BS EN L2275-ENGL 2000 Lb24bb 0853363 875 Page 3 EN 12295: 1999 1 Scope This standard specifies a method for testing the resistance of joints
20、to pressure cycling. It is applicable to piping systems based on rigid or flexible thermoplastics pipes intended to be used in hot and cold water applications. 2 Principle An assembly of pipes and fittings is subjected to pressure cycling in air or water between two positive pressure limits via wate
21、r while being maintained at a specified temperature and inspected for leakage. NOTE: It is assumed that the following test parameters are set by the standard making reference to this standard: a) the test temperature (see 3.3 and 5.2); b) the number of test pieces (see 4.2); c) the test pressure lim
22、its (see 6.1); d) the duration of one cycle (see 6.1); e) the number of cycles (see 6.2). 3 Apparatus 3.1 Pressurizing device, capable of applying and regulating the water pressure in the test piece to a sinusoidal form between pressure limits as specified in the referring standard. NOTE: It may be
23、necessary to compensate for any differences between the pressure at the position of the test piece and the pressure indicated at any other measuring point. 3.2 Pressure measurement device, capable of measuring the water pressure in the test piece with an accuracy of i15 %. The measurement device sha
24、ll be capable of producing a record of the sinusoidal wave form. NOTE: It may be necessary to compensate for any differences between the pressure at the position of the test piece and the pressure indicated at any other measuring point. 3.3 Test chamber, capable of maintaining the specified test tem
25、perature within fl OC, unless testing in the range (23 1: 5) OC, in which case the permitted deviations shall be +2 “C. 3.4 Thermometer), capable of checking conformity to the specified test temperature (see 3.3). 3.5 End-sealing device, of appropriate size and sealing method, for sealing the non-jo
26、inted end of the test piece. The device shall be restrained in a manner that does not exert longitudinal forces on the joints. 3.6 A typical test arrangement is shown in Figure 1. O BSI 05-2000 Page 4 EN 12295: 1999 D E B F H -G A Electric control B Valve C Compressed air cylinder D Water E Air F Pr
27、essure converter G Temperature controlled test chamber H Test assemblies Figure 1 - Schematic test arrangement 4 Test pieces 4.1 Preparation The test piece shall comprise an assembly of pipes and at least one fitting joined in accordance with the manufacturers recommended practice. The free length o
28、n each side of the fitting under test shall be not less than either l,Wn or 300 mm, whichever is the greater, where d, is the nominal outside diameter of the pipe. In order to include the required number of pipes and fitting), several test pieces may be tested simultaneously provided that the failur
29、e of one test piece does not affect the others under test. 4.2 Number The number of test pieces shall be as specified in the referring standard. 5 Conditioning 5.1 Prime each test piece with water so that all air is expelled. 5.2 Bring the test piece and water therein to the test temperature as spec
30、ified in the referring standard. 5.3 Condition the test piece at the applicable test temperature given in Table 1 before or after connecting the test piece) tc the pressurizing device. If subsequent connection is necessary, ensure that all air is again expelled and that the conditioning has been com
31、pleted immediately before connection to the pressurizing device. 8 BSI 05-2000 Page 5 EN 12295: 1 999 Table 1 - Conditioning periods Pipe wall thickness e mrn Conditioning period e 3 31e 8 8sec16 16 I e 32 1 hrt 5min 3 h +_ 15 min 6 h f 30 min 10hI Ih 6 Procedure 6.1 As specified in the referring st
32、andard, apply alternately to the test piece the two internal pressures and maintain the cycle frequency and test temperatures accordingly. 6.2 During and on completion of the number of cycles specified by the referring standard, inspect all joints for any sign of leakage, and record the wave form at
33、 regular intervals. 6.3 If leakage occurs prior to completion of the number of cycles specified by the referring standard, record the number of elapsed cycles and the position and nature of the leak. 7 Testreport The test report shall include the following information: a) a reference to this standar
34、d and to the referring standard; b) the identification and the number of the components under test, including their operating pressure; c) the test temperature; d) the test pressures comprising the lowest and the highest of the cycle; e) the duration of one cycle; f) the number of cycles; g) a recor
35、d of the wave form at the start and the end of each test; h) the signs of leakage, if any, and where and when they occurred; 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 test. Q BSI 05-2000 BS EN 122
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