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1、BRITISH STANDARD BS EN 744:1996 BS 2782-11: Method 1108C:1996 Plastics piping and ducting systems Thermoplastics pipes Test method for resistance to external blows by the round-the-clock method The European Standard EN 744:1995 has the status of a British Standard ICS 23.040.20 Licensed Copy: sheffi
2、eldun sheffieldun, na, Tue Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 744:1996 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 on 15 F
3、ebruary 1996 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PRI/61 Draft for comment 92/413382 DC ISBN 0 580 25149 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/6
4、1, Plastics piping systems and components, upon which the following bodies were represented: British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers Association British Valve and Actuator Manufacturers Association Department of the Environment (British Board of Agrment) D
5、epartment of the Environment (Building Research Establishment) Department of the Environment (Property and Building Directorate) Department of Transport Electricity Association Federation of Civil Engineering Contractors Health and Safety Executive Institute of Building Control Institute of Material
6、s Institution of Civil Engineers Institution of Gas Engineers Institution of Water and Environmental Management National Association of Plumbing, Heating and Mechanical Services Contractors Pipeline Industries Guild Plastics Land Drainage Manufacturers Association Society of British Gas Industries S
7、ociety of British Water Industries Water Companies Association Water Services Association of England and Wales The following bodies were also represented in the drafting of the standard, through subcommittees and panels: ERA Technology Ltd. Engineering Equipment and Materials Users Association RAPRA
8、 Technology Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 744:1996 BSI 07-1999i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1Sc
9、ope3 2Definition3 3Principle3 4Apparatus3 5Test pieces6 6Conditioning6 7Procedure6 8Expression of results7 9Test report8 Annex A (informative) Evaluation of results from isolated batches9 Figure 1 Typical falling weight testing machine4 Figure 2 Dimensions of strikers5 Figure 3 Number of test pieces
10、 for 10 % TIR (at 90 % confidence level)8 Table 1 Dimensions for the nose of the striker3 Table 2 Mass of strikers3 Table 3 Number of equidistant lines to be drawn on the test pieces6 Table 4 Conditioning periods6 Table 5 Expression of TIR at 10 % depending on the number of blows and failures7 Licen
11、sed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 744:1996 ii BSI 07-1999 National foreword This British Standard has been prepared by Technical Committee PRI/61 and is the English language version of EN 744:1995 Plastics piping and ducting s
12、ystems Thermoplastics pipes Test method for resistance to external blows by the round-the-clock method, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of testing plastics Part 11: Thermoplastics pipes, fittings and valves, as Method 1108C:1995
13、for association with related test methods for plastics materials and plastics piping components. This test method has been prepared for reference by other standards under preparation by CEN for specification of plastics piping systems and components. It has been implemented to enable experience of t
14、he method to be gained, and for use for other fresh applications. 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
15、 until that standard/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate. In particular, attention is drawn to the fact that because of e.g. differences in striker geometry, this method is not expected to give identical results to tho
16、se obtained by reference to BS 2782-11:Method 1108A:1989, the use of which should be restricted to its current applications. Pending any related amendment of EN 744:1995, attention is drawn to the requirement in clause 6 to use a bath of water and ice for conditioning at 0 C, which may inhibit the u
17、se of equipment where the bath liquid temperature is controlled by passage through or past a heat exchanger operating at a lower temperature. WARNING NOTE. This British Standard, which is identical with EN 744:1995, does not necessarily detail all the precautions necessary to meet the requirements o
18、f 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 contract. Users of British Standards are respons
19、ible 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 10 and a back cover. This standard has been u
20、pdated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM
21、EN 744 April 1995 ICS 23.040.20 Descriptors: Plastic tubes, thermoplastic resins, mechanical tests, impact test, shock resistance English version Plastics piping and ducting systems Thermoplastics pipes Test method for resistance to external blows by the round-the-clock method Systmes de canalisatio
22、ns et de gaines en plastiques Tubes thermoplastiques Mthode dessai de rsistance aux chocs externes par la mthode du cadran Kunststoff-Rohrleitungs- und Schutzrohrsysteme Rohre aus Thermoplasten Prfverfahren fr die Widerstandsfhigkeit gegen uere Schlagbeanspruchung im Umfangsverfahren This European S
23、tandard was approved by CEN on 1995-02-06. 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 s
24、uch 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 member into its own languag
25、e and notified to the Central Secretariat has the same status as the official versions. CEN members are the national bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdo
26、m. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No
27、. EN 744:1995 E Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 744:1995 BSI 07-1999 2 Foreword This European Standard was prepared by CEN/TC 155, Plastics piping systems and ducting systems, of which the secretariat is held by NNI. This
28、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 October 1995, and conflicting national standards shall be withdrawn at the latest by October 1995. According to the CEN/CENELEC Internal Regulations, the
29、 following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. This standard is based on ISO/DIS 3127:1992 Unplasticized p
30、olyvinyl chloride (PVC) pipes for the transport of fluids Determination and specification of resistance to external blows, prepared by the International Organization for Standardization (ISO). It is a modification of ISO/DIS 3127:1992 for reasons of applicability to other plastics materials and/or o
31、ther test conditions and alignment with texts of other standards on test methods. The modifications are: no pipe material is mentioned; test parameters, except those common to all plastics, are omitted; no material-dependent requirements are given; editorial changes have been introduced. The materia
32、l-dependent parameters and/or performance requirements are incorporated in the system standard(s) concerned. Annex A, which is informative, gives guidance on sampling. No existing European Standard is superseded by this standard. This standard is one of a series of standards on test methods which su
33、pport system standards for plastics piping systems and ducting systems. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 744:1995 BSI 07-19993 1 Scope This standard specifies a method for determining the resistance to external blows of the
34、rmoplastics pipes with circular cross sections by using the round-the-clock method. The method is intended to be applied to isolated batches of pipe. For type testing and audit testing, 0 C and/or 20 C are applicable. NOTEPipes made from polypropylene homopolymer (PP-H) which principally can not con
35、form to impact requirements at 0 C or lower temperatures are permitted to be tested at (23 2) C under the condition that PP-H pipes are intended for use for soil and waste discharge and bear an additional marking indicating that they are not to be installed below + 5 C. 2 Definition For the purposes
36、 of this standard, the following definition applies. true impact rate (TIR) the total number of failures divided by the total number of blows, in per cent, as if the whole batch had been tested NOTEIn practice, test pieces are drawn at random from the batch and the result is only an estimate of the
37、TIR for that batch. 3 Principle Test pieces comprising cut lengths of pipe, representative of a batch or a production run from an extruder, are subjected to blows from a falling weight dropped from a specified height on to specified positions around the circumference of the pipe. The incidence of fa
38、ilure is estimated as the true impact rate (TIR) of the batch, or production run, where the maximum value for TIR is 10 %. NOTE 1The severity of this test method can be adjusted to suit different specification needs by changing the mass of the falling weight and/or by changing the fall height. It is
39、 not technically correct to vary the severity of the test by choosing other values of TIR than that specified in this method. NOTE 2It should be appreciated that a completely definitive result can only be reached by testing the whole batch, but in practice a balance is necessary between the statisti
40、cal possibility of a definitive result and the cost of further testing. NOTE 3It is assumed that the following test parameters are set by the standard making reference to this standard: a) the type of striker and striker mass see b) of clause 4 and item a) of 7.1; b) the drop height for the striker
41、see d) of clause 4 and 7.2, 7.3 and/or 7.4 as applicable; c) the method of sampling see 5.1 and c) of clause 9; d) if appropriate, the number of test pieces to be used (see 5.2 and clause 7); e) the test and conditioning temperature and the conditioning medium (see clause 6); f) if applicable, any a
42、lternative or additional criterion for failure see d) of 7.1. 4 Apparatus A falling weight testing machine incorporating the following basic components (see Figure 1): a) main frame, with guide rails or a guiding tube rigidly fixed in the vertical position to accommodate a striker see b) and release
43、 it to fall vertically and freely such that the speed of the striker at the moment of hitting the pipe is not less than 95 % of the theoretical speed; b) striker, having a nose comprising all or part of a hemispherical form combined with a cylindrical stem at least 10 mm long and having dimensions c
44、onforming to Table 1 and Figure 2, depending upon the mass of the striker. The mass of the striker, including any associated weights, shall be selected from Table 2. Below the stem, the nose shall be of steel with a minimum wall thickness of 5 mm and the striking surface shall be free from imperfect
45、ions which can influence the results. c) rigid test piece support, consisting of a 120 vee-block at least 200 mm long, positioned so that the axis of the line of fall of the nose of the striker shall intersect the axes of the vee to within 2,5 mm (see Figure 1). The support construction shall be suf
46、ficiently rigid not to cushion the effect of the impact. d) release mechanism, such that the falling weight can fall from a height which can be adjusted up to at least 2 m, as measured from the top surface of the test piece. Table 1 Dimensions for the nose of the striker Table 2 Mass of strikers Typ
47、eRsddsa mmmm d255025 aa d905090 aa a Not specified, to allow design freedom. Masses in kilograms Mass of striker 0.005 kg Type d25Type d90 0,25 0,5 0,8 1,0 1,25 1,6 2,0 2,5 3,2 4,0 5,0 6,3 8,0 10,0 12,5 16,0 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled
48、 Copy, (c) BSI EN 744:1995 4 BSI 07-1999 Figure 1 Typical falling weight testing machine Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 744:1995 BSI 07-19995 Figure 2 Dimensions of strikers Licensed Copy: sheffieldun sheffieldun, na, Tue
49、 Nov 07 03:43:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 744:1995 6 BSI 07-1999 5 Test pieces 5.1 Preparation The test pieces shall be cut from pipes selected at random from a batch or from a product run from an extruder. For each test piece, the length shall be (200 10) mm. The cut ends shall be square to the axis of the pipe, clean and free from damage. For pipes with outside diameters greater than 40 mm, a number of longitudinal lines conforming to Table 3 shall be