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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12256:1998 BS 2782-
2、11: Method 1111F:1998 The European Standard EN 12256:1998 has the status of a British Standard ICS 23.040.45 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plastics piping systems Thermoplastics fittings Test method for mechanical strength or flexibility of fabricated fitting
3、s Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:02:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British 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
4、 on 15 October 1998 BSI 1998 ISBN 0 580 29346 7 BS EN 12256:1998 Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 12256:1998. It is also incorporated into BS 2782 Methods of testing Plastics: Part 11: Thermopl
5、astics pipes, fittings and valves, as Method 1111F:1998, for association with related test methods for plastics materials and plastics piping systems. The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping systems and components, which has the responsibi
6、lity 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 of organization
7、s represented 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 wi
8、ll also be necessary. 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 5) C. Hence the water introduced
9、 should be at (23 5) C or the filled assembly should be (re)conditioned at (23 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
10、pressure or a vacuum. Introduction of air pressure or vacuum as alternatives 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 con
11、sistency with 6.2, the UK technical committee makes the following recommendations. 1) When applying and maintaining the necessary force to obtain the specified moment, the internal water or air pressure should be equivalent to a water head of between 200 mm and 300 mm above the critical point. 2) If
12、 inspection is performed after relaxing the force or displacement, the internal 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. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:02:36 GMT+00:00 2006,
13、Uncontrolled Copy, (c) BSI BSI 1998i BS EN 12256:1998 3) In case of dispute, the internal medium should be water, unless otherwise specified in the referring standard. Cross-references The British Standards which implement international or European publications referred to in this document may be fo
14、und in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Warning note: This British Standard, which is identical with EN 12256:1998, does not necessarily detail all the precaut
15、ions 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 trained personnel. A British Standard does not purport to include all the necessary provisions of a contrac
16、t. 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 cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 5 an
17、d a back cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:02:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iiblank Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:02:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de
18、 Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12256:1998 E EUROPEAN STANDARDEN12256 NORME EUROPE ENNE EUROPA ISCHE NO
19、RM 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 Thermoplastics fittings Test method for mechanical strength or flexibility of fabricated fittings Syste
20、 mes de canalisations en plastique Raccords thermoplastiques Me thode dessai de la re sistance me canique ou de la flexibilite des raccords faonne s Kunststoff-Rohrleitungssysteme Formstu cke aus Thermoplasten Pru fverfahren der mechanischen Festigkeit oder Elastizita t von handgefertigten Formstu c
21、ken This European Standard was approved by CEN on 9 January 1998. 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
22、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 made by translation under the responsibility of a CEN memb
23、er into its own language and notified to 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, Portu
24、gal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:02:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 12256:1998 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 155 Plastics piping systems and
25、 ducting systems the secretariat of which is held by NNI. The material dependent parameters 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
26、and ducting systems. This 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 standards shall be withdrawn at the latest by November 1998. According to the CEN/CENEL
27、EC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swit
28、zerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Principle3 3Apparatus3 4Test piece4 5Conditioning4 6Procedure4 7Test report5 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:02:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12256:1998 BSI 1998 ADisplacement BFixing
29、 CExample of critical point (see clause 2) Figure 1 Typical test assembly for a branch with a socket 1 Scope This standard specifies a method for testing the mechanical strength or flexibility of a fabricated thermoplastics fitting intended to be used in non- pressure underground applications. NOTET
30、he method is intended to be used for type-testing. 2 Principle An assembly of a fabricated fitting and the relevant number of adjacent pipes(s) and anchorages (see Figures 1 and 2) is subjected to a moment at the critical point. The critical point is where structural damage is most likely to start w
31、hen increasing the moment. Either a specified moment, M, or a specified displacement, A, becomes the determining factor, whichever is reached first. NOTEIt is assumed that the following test parameters are set by the standard making reference to this standard: a) the sampling procedure and the numbe
32、r of test pieces (see 4.2); b) the conditioning temperature, if other than (235) 8C (see clause 5); c) the conditioning time, if other than 21 days (see clause 5); d) if appropriate, the moment (M = F 3 L) or displacement to be applied (see clause 6). 3 Apparatus 3.1 Anchorages(s), capable of holdin
33、g the body of the fabricated fitting rigid during the test. The anchorages shall not deform the fitting. 3.2 Equipment, capable of applying a force that will 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
34、 stresses are applied to the critical point. 3.3 Equipment capable of determining the length, L, of the arm to the critical point (see Figures 1 and 2). When the displacement, A, is the determining factor, the arm, L, as shown in Figures 1 and 2, shall be (120010) mm. 3.4 Force and/or displacement m
35、easurement instruments, capable of determining the force applied and/or the displacement of the end of the arm to which the force is applied, as applicable (see clause 4 and Table 1). Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:02:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN
36、 12256:1998 BSI 1998 ADisplacement BFixing CExample of critical point (see clause 2) Figure 2 Typical test assembly for a bend with a socket If a socket is designed to take up an angular deflection, b, the total displacement shall be the sum of the displacement given by the design angle b, as declar
37、ed by the manufacturer, plus the specified displacement. In this case, however, a mechanical arrangement, where the arm is fixed to the socket, is preferred. 3.5 If necessary, additional means to ensure the tightness of the joint (see clause 4). 4 Test piece 4.1 Preparation The test piece shall comp
38、rise an assembly of the fabricated fitting, with a pipe of the ring stiffness class for which the fitting is designed and fixings as appropriate. In the case where a fitting is designed for both solid wall and structured-wall pipes, a solid wall pipe shall be used. If the limiting factor is the mome
39、nt, M, the pipe may be replaced by a mechanical arrangement that ensures that 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
40、specified pipe shall be used. Where a joint between a pipe and a fabricated fitting 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 p
41、rocedure and the number of test pieces shall be as specified in the referring standard. 5 Conditioning Samples shall be stored at room temperature of (235) 8C for at least 21 days before testing, unless otherwise specified in the referring standard. 6 Procedure 6.1 Non-mechanical jointed fabricated
42、fittings (cemented or fused) Carry out the following procedure at (235) 8C. Assemble the fitting with the pipe or mechanical arrangement (see 4.1) and fix it e.g. as shown in Figure 1 or 2. If possible, fill the assembly with water or air pressure. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct
43、 28 15:02:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 12256:1998 BSI 1998 Apply the necessary force in 1 s to 20 s to obtain the specified moment at the critical point or the specified displacement as given in Table 1, unless otherwise specified in the referring standard. Maintain the fo
44、rce or the displacement applied for 15 min while monitoring for and recording any signs of splitting, cracking, separation and/or leakage. The inspection may be performed after the relaxing of force or displacement, and if necessary also after removal from the anchorage, by applying water or air pre
45、ssure or vacuum. Record any leakage at the fabricated joint as a failure. 6.2 Mechanical jointed fabricated fittings Carry out the following procedure at (235) 8C. Assemble the fitting with the pipe or mechanical arrangement (see 4.1) and fix it e.g. as shown in Figure 1 or 2. Fill the assembly with
46、 water until the level is between 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 point or the specified displacement as given in Table 1, unless otherwise specified in the referring standard. Maintain the forc
47、e 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 failure. Table 1 Moment/displacement to be applied Nominal sizeMinimum momentMinimum DN/OD1)displacement kNmmm 1100
48、,20170 1250,29170 1600,61170 2001,2170 2502,3170 3153,1170 3553,5170 4004,0170 4504,5170 5005,0170 6306,3170 7107,1170 8008,0170 9009,0170 100010170 1) For fitting of a DN/ID series conduct the test using the parameters specified for the next larger DN/OD pipe than the actual outside diameter of the
49、 corresponding pipe. NOTEFor DN/ODs up to and including 250, the figures of the minimum moment approximate to the following equation: M = 0,15 3 DN33 1026kNm For DN/ODs greater than 250, the following equation is used: M =0,010 3 DN kNm 7 Test 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 stiffness of the pipe used, if applicable; c) the method of jointing, e.g. mechanical, c