EN 12256-1998 en Plastics Piping Systems - Thermoplastics Fittings - Test Method for Mechanical Strength or Flexibility of Fabricated Fittings《塑料管道系统 热塑性塑料配件 装配式配件机械强度或挠度的试验方法》.pdf

1、STD-BSI BS EN l1225b-ENGL 1998 U Lb24bb9 092L391 959 BRITISH STANDARD Plastics piping systems - Thermoplastics fittings - Test method for mechanical strength or flexibility of fabricated fittings The European Standard EN 122561998 has the status of a British Standard ICs 23.040.45 NO COPYING WITHOUT

2、 BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 12256:1998 BS 2782-11: Method 1111F1998 STDOBSI BS EN 32256-ENGL I1998 W 3624669 0723392 895 W BS EN 122661998 Amd. No. National foreword Date Text affected This BriW Standard is the English language version of EN 122561998. It is also incor

3、porated into BS 2782 Methods of testing FYmtics Part 11: Thermoplastics pipes, fittings anci wlw, as Method 1111F1998, for association with related test methods for piastics materials and piastics piping systems. The UK participation in its preparation was enlnst.4 to Technical Committee PRY61, Plas

4、tics piping systems and components, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related intemational and European developments and promulgate interpretation, or proposals for change, and keep

5、the UK interests informed them in the UK. This British Standard, having been prepared under the direction of the Sector Board for Materiais and Chemicals, was published under the authority of the Standards Board and comes into effect on 16 October 1998 Q BSI 1998 A list of organizations represented

6、on this committee can be obtained on request to its secretary. Additional information a) Apparautus (clause 3) For the purposes of 6.1 air pressure or vacuum may be used instead of water as the medium for internal pressure, in which case relevant pneumatic supply and control devices wili also be nec

7、essary. b) Water temperature When filling the assembly with water in accordance with 6.1 or 6.2, as applicable, it is important that the temperature of the water does not cause the temperature of the test piece to deviate from the specified range of (23 f 5) “C. Hence the water introduced should be

8、at (23 f 5) “C or the fled assembly should be (re)conditioned at (23 k 5) C until the assembly and its contents are within that temperature range throughout before commencing to apply the necessary force. c) Procedure When testing in accordance with 6.1 the internal fluid may be water or air pressur

9、e or a vacuum. Introduction of air pressure or vacuum as alternaiives to water together with rearrangement of the text of the draft for public comment means that as ratified no limits are specified for the internal pressure, nor is any one medium identified for use in case of dispute. For consistenc

10、y with 6.2, the K technical committee makes the following recommendations. 1) When applying and maintaining the necessary force to obtain the specified moment, the internai water or air pressure should be equivalent to a water head of between 200 mm and 300 mm above the critid point. 2) if inspectio

11、n is performed after relaxing the force or displacement, the internai water or air pressure or vacuum, as applicable, should be equivalent to a water head of between 200 mm and 300 mm above the critical point. ISBN O 680 29346 7 STD-BSI BS EN l1225b-ENGL 1998 I Lb24bb9 0723393 723 BS EN 122561998 3)

12、 In case of dispute, the intenial medium should be water, unies otherwise specified in the referring standard. Cross-references The British Standards which implement inkdona,l or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled

13、 ?Intemational Standards Correspondence index?, or by using the ?Find? faciity of the BSI Standards Electronic Catalogue. Warning note: This British standard, which is identical with EN 12256: 1998, does not necessarily detail ail the precautions necessary to meet the requirements of the Health and

14、Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by hed personnel. A British Standard does not purport to include ali the necessary provisions of a contract. Users of British Standards are responsible for their correc

15、t application. 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, pages i and ii, the EN title page, pages 2 to 5 and a back cover. O BSI 1998 i STDOBSI BS EN L225b-ENGL 1398 m E

16、UROPEAN STANDARD NORNE EUROPENNE EXJROP- NORM Lb2YLb 072L39Y 668 m EN 12256 May 1998 ICs 23.040.45 Descriptors: plastic tubes, pipe fittings, thermoplastic resins, sanitation, buried pipes, tests, mechanical strength, flexibility English version Plastics piping systems - Therrnopla,stics fitting - T

17、st methad for mechanicas. strength or flexibty of fabricated fittings Systemes de canalisati * om en plastique - Raccords thermoplastiques - Mthode dessai de la rsistance mcanique ou de la flexibilitk des raccords faconns Formstcken Kunststoff-Rohrleitmgsyskme - Formstcke aus Thermoplasten - Prfverh

18、hren der mechanischen Feeit oder Elashtt von handgefertigten This European Standard was approved by CEN on 9 January 1998. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipuiate the conditions for giving this European Standard the status of a national standard witho

19、ut any alteration. Up-to-date lists and bibliographical references concerning such national standards 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 ma

20、de by translation under the responsibility of a CEN member into its own language and notified to the Cenid 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, Icehd, Ir

21、eland, Italy, Luxembourg, Netherlands, Norww) Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Commim for Standardization Comitk Europen de Nonakh on Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1060 Brussels O 1998 CEN Ail rights of exploitation in

22、any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12256:1998 E STD.BSI BS EN 32256-ENGL 1998 = 362tbb 0723395 5T4 Page 2 EN 122661998 Foreword This European Standard has been prepared by Technical Committee CENEC 155 “Plastics piping systems and ducting systems” the

23、secretariat of which is held by NNI. The material dependent parametem and/or performance requirements are incorporated in the system standards(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. T

24、his European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1998, and conflicting national stan b) the conditioning temperature, if other than (23 +_ 5) “C (see clause 6); c) the conditioning time, if

25、 other than 21 days (see ciawe 6); d) if appropriat, the moment (M = F X L) or displacement to be applied (see clause 6). 3 Apparatus 3.1 Amme.s(s), capable of holding the body of the fabricated fitting rigid during the test. The anchorages shal not deform the fitting. 3.2 Equipment, capable of appl

26、ying a force that wiU result in a moment in the critical point (see clause 6). The direction of the force can be clockwise or anti- clockwise, provided that tensile stresses are applied to the critical point. 3.3 Equipment capable of determining the .!mgth, L, of the arm to the crtical point (see Fi

27、gures 1 and 2). When the displacement, A, is the determining factor, the arm, L, as shown in Fgures 1 and 2, shall be 3.4 Force and/or dispkxement measurement instruments, capable of determining the force applied andor the displacement of the end of the arm to which the force is applied, as applicab

28、le (see clause 4 and Wle 1). (1200 f 10) m. B A Displacement B Fxing C Example of critical point (see clause 2) Figure 1 - mical test assembly for a branch with a socket O BSI 1998 STD=BSI BS EN L225b-ENGL 1994 W Lb24bb9 0723397 377 Page 4 EN 122661998 A Displacement B Fixing C Figure 2 - Spical tes

29、t assembly for a bend with a socket Example of cntica point (see clause 2) If a socket is designed to take up an angular deflection, fi, the totai displacement shall be the sum of the displacement given by the design angle fi, as declared by the manufacturer, plus the specified displacement, In this

30、 case, however, a mechanical arrangement, where the arm is ked to the socket, is preferred 3.6 ifnmmary, additiunaL namns to ensure the tightness of hjoint (see clause 4). 4 Test piece 4.1 Preparation The test piece shail comprise an assembly of the fabricate fitting, with a pipe of the ring stiffne

31、ss class for which the fitting is designed and fiznngs as appropriate. In the case where a fitting is designed for both soiid wall and structured-wall pipes, a solid wail pipe shall be used. If the limiting factor is the moment, M, the pipe may be repiaced by a mechanical arrangement that ensures th

32、at the required moment is applied if the limiting factor is the displacement, A, the pipe may be replaced by a mechanical arrangement of longitudinal rigidity not less than that of the specified pipe. in case of dispute the specied pipe shall be used. Where a joint between a pipe and a fabricated fi

33、tting is made, the manufacturers instructions shall be followed except that additional means may be used to ensure the tightness of the joint during the test. 4.2 Sampling procedure and number of test pieces The sampling procedure and the number of test pieces shall be as specied in the referring st

34、andard. 6 Conditioning Samples shali be stored at room temperature of (23 * 5) “C for at least 21 days before testing, unies otherwise specified in the referring standard. 6 Procedure 6.1 Non-mechanical jointed fabricated fittings (cemented or fused) Cany out the following procedure at (23 f 6) “C.

35、Assemble the fitting with the pipe or mechanical arrangement (see 4.1) and fix it e.g. as shown in Figure 10r2. If posible, n11 the assembly with water or air pressure. O BSI 1998 Apply the necessary force in 1 s to 20 s to obtain the specifed moment at the critical point or the specified isplacemen

36、t as given in Wle 1, unies otherwise specified in the referring standard. Maintain the force or the displacement applied for 15 min while monitoring for and recordmg any signs of spiitting, cracking, separation and/or leakage. The inspection may be perormed after the relaxing of force or displacemen

37、t, and if necessary also after removal from the anchorage, by applying water or air pressure or vacuum. Record any leakage at the fabricated joint as a failure. 6.2 Mechanical jointed fabricated fittings Carry out the following procedure at (23 f 5) OC. Assemble the fitting with the pipe or mechanic

38、al arrangement (see 4.1) and fix it e.g. as shown in Figure 1 or 2. Fill the assembly with water untii the level is belmeen 200 mm and 300 mm above the critical point. Apply the necessary force between 1 s and 20 s to obtain the specified moment at the critical Doint or the specified displacement as

39、 given in ?Ltble i, ;nieSc otherwise specified in the referring standard. Maintain the force or the displacement applied for 15 min while monitoring for and recording any signs of splitting, cracking, separation and/or leakage. Record any leakage at the fabricated joint as a faiiure. Table 1- Mon No

40、mina) size DN/OD) 110 125 160 200 250 315 355 400 450 500 630 710 800 900 LOO0 I) For fitting of a Dh !ntdisplacemei Minimum momeni Wem 0,20 0,29 0,61 172 ; to be applied Minimum displacernent mm 170 170 170 170 170 170 170 170 170 170 1 70 170 170 170 170 D series conduct the test using the mameter

41、s specified for the next larger DN/OD pipe than the ictual outside diameter of the corresponding pipe. Page 5 EN 122561998 NOTE For DN/ODs up to and including 250, the figures of the minimum moment approximate to the following equation: For DN/ODs greater than 250, the following equation is used M=

42、0,15 X DNI3 X 10 kN.m M=0,010 X DN kN.m 7 Tkst report The test report shall include the following information: a) a reference to this standard and to the referring standard; b) identity of the product(s) tested, including the Stitniess of the pipe used, if applicable; c) the method of jointing, e.g.

43、 mechanical, cemented, fused; d) the method of determining splitting, cracking, separation and/or leakage; e) the determining factor applicable, i.e. moment or displacement; f) a brief description of the test app-, g) the permitted angular deflection, if any (see 3.4); h) the moment or the displacem

44、ent applied; i) details of any signs of splitting, cracking, separation and/or leakage; j) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard k) the date of the test. O BSI 1998 STD.BSI BS EN 3225b-ENGL 3978 1624669 0723399

45、34T BS EN 12256:1998 Method 11 11F1998 BS 2782-11: BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incor

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