1、BRITISH STANDARD Plastics piping and ducting systems - Thermoplastics spirally-formed structured-wall pipes - Determination of the tensile strength of a seam The European Standard EN 19791999 has the status of a British Standard ICs 23.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY
2、COPYRIGHT LAW BS EN 1979:1999 BS 2782-11: Method 111oc:1999 BS EN 19791999 Amd. No. National foreword Date Comments This British Standard is the English language version of EN 19791999. The UK participation in its preparation was entrusted to Technical Committee PRU61, Plastics piping systems and co
3、mponents, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationaEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed - monitor related international and European developments an
4、d promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. This European Standard is Aso incorporated into BS 2782-1 1 Methods of testing plastics - Part 11: Thermopplasticspipes, fittings and valves, as Method lllOC1999, for assoc
5、iation with related test methods for plastics materials and plastics piping systems. It may be used for the revision or amendment of other national standards, but it should not be presumed to apply to any existing standard or specification which contains or makes reference to a different test method
6、 until that standardspecification has been amended or revised to make reference to this method and aaust any requirements as appropriate. The responsible UK technical committee considers that certain aspects of the text as published could be misleading and require clarification or further attention
7、as follows. a) Attention is drawn to the requirement given in 6.1 that the “test piece shall consist of the overall wall thickness (construction height) of the pipe from which it is taken“. b) As shown in the plan view in Figure 1, the length of the test piece may include ribs or other features in t
8、he vicinity of the seam. in 6.2.2, in the third paragraph it is stated that “individual ribs in the grip area may be removed if needed for a proper attachment of the grips“. Figure 1 includes a section view in which no residual ribs are shown aacent to the interlocking seam profiles. The UK technica
9、l committee considers that the requirements of 6.1 demand the retention of the overall wall thickness in respect of at least any ribs or other structural features adjacent to the seam, since these may be designed to contribute to the stability of the seam. The committee considers that any removal of
10、 ribs to achieve attachment of the grips should be applied at the free ends of the test piece and should not remove the nearest of any such features to the seam. The section view shown in Figure 1 should therefore not be taken as indicating that all ribs or profile variations not integral with the i
11、nterlocking seam profiles may or should be removed from the test piece. Cross-references The British Standards which implement intemational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Corresponde
12、nce Index, or using the Find facility of the BSI Standards Electronic Catalogue. WARNING This British standard, which is identical with EN 19791999, does not necessarily detail ali the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be
13、paid to any appropriate safety precautions and the method should be performed only by trained personnel. A British Standard does not purport to include ali the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Stan
14、dard 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 5 and a back cover. . This British Standard, having been prepared under the direction of the Sector Committee for Materials and
15、 Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 June 1999 O BSI 06-1999 ISBN O 580 32500 8 ICs 23.040.20 Demiptors: plastic tubes, thermoplastics resins, welded joints, tests, determination, tensile strength, test specimen Enghh version Plastics p
16、iping and ducting systms - Thermoplastics spirally-fomed structured-wd pipes - Determination of the knde skengthofaseam Systmes de canalisat3 * ow et de gaines en matiereS plastiques - lk thermoplastiques paroi structure muls en hlice - Dtermination de la rsktance en traction de la ne de soudure Kms
17、tsbff-FoMeiW und Schutzromme - Thermoplastische !3piralrohre mit prolierter Wandung - Fkstimmung der Zugfestagkeit einer Verbindungsnaht This European Standard was approved by CEN on 28 November 1998. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipW the conditions
18、 for giving this European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standars may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three officiai
19、 venions (English, French, German). A venion in any other language made by translation under the responsibility of a CEN member 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 Aus- Belgium, C
20、zech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Pow, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standarmion Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Sta
21、ssart 36, B-1050 Brussels O 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 19791999 E STD-BSI BS EN Ii979-ENGL 1999 = Lb24bb9 078Lb53 277 Page 2 EN 19791999 Foreword This European Standard has been prepared by Technical commi
22、ttee CENK 155, Plastics piping systems and ducting systems, the Secretariat of which is held by NNI. This European Standard sha be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 1999, and conflicting national standards sha
23、 be withdrawn at the latest by July 1999. According to the CEN/CENELEC Internai Regulations, the national standards organhalions of the following countries are bound to implement this European Stan- Austria, Belgium, Czech Republic, Denmark, Finiand, France, Germany, Greece, Iceland, Ireland, Italy,
24、 Luxembourg, Netherlands, Norwax Portugal, Spain, Sweden, Switzerland and the United Kingdom. The materialdependent parametem andor perfomance requirements are incorporated in the System standard) concerned This standard is one of a series of standards on test methods which support System Standards
25、for plastics piping systems and ducting systems. O BSI 06-1999 1 scope This standard specifies a method for determining the tensile strength of a seam in a spirally-formed thermoplastics pipe. It is applicable to all such thermoplastics pipes, regardless of their intended use. 2 Normative references
26、 This standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited a b) damage to its surface, such as cracks, scratches or other visible flaws; to an extent that would affect the tensile properties to be measured. If the width of the
27、wound profile is such that more than one seam is included in the length of the test piece, the test piece shall be cut in such a way that the seams are symmetrically located over the test piece. If it is not possible to cut the test piece without getting a rib in the grip area, the test piece may be
28、 cut slightly longer or shorter as needed to avoid this situation. Individuai ribs in the grip area may be removed if needed for a proper attachment of the grips. Page 4 EN 19791999 F4+ +F A seam B Example of a seam NOTE The lower figure is schematically oniy. Dimensions in millimetres Figure 1 - Lo
29、cation and dimensions of a test piece O BSI 061999 STD-BSI BS EN 1777-ENGL 1777 = lb2Libb7 07BLb5b TTb Page 6 EN 19791999 6 Conditioning The test pieces shail be conditioned at (23 f 2) OC for not less than 1 h in water or2 h in air, except in cases of dispute when the minimum perio shall be 2 h in
30、wahror4hhair. 7 Bst temperature The test temperatwe shall be (23 f 2) “C. 8 Procedure 8.1 Place the test piece in the tensile testing machine so that there is axial alignment with the direction of pui. Clamp the grips uniformly and suficienty tightly to prevent any slipping of the test piece. 8.2 Se
31、t the rate of movement of the grips to the value specified in the referring standard and start the machine. 8.3 Record the maximum force necessary duMg testing to rupture of the test piece. 8.4 Repeat the test until five results have been obtained, after discarding any test pieces which have slipped
32、 in the grips. 9 Expression of results For each test piece note the maximum force, in newtons, recorded during the test to rupture of the seam. Express the result as the tensile strength of the seam in newtons per 15 mm width. 10 IIrst report The test report shail include the foilowing information:
33、a) a reference to this standard and to the referring b) the complete identification of the pipe tested, including the constituent materiai, wa construction type, origin and nominal size; c) the conditioning medium (water or air) and conitioning period; d) the number of test pieces tested; e) the rat
34、e of movement of the grips; f) the tensile stsength of the seam, in newtons per 15 mm width, for each test piece; g) any factors which may have affected the results, each as any incidents or any operating details not specified in this standard; h) the date of test. O BSI 06-1999 BS EN 1979:1999 BS 2
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