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1、BRITISH STANDARD BS EN ISO 9969:1995 BS 2782-11: Method 1114B:1995 Thermoplastics pipes Determination of ring stiffness The European Standard EN ISO 9969:1995 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:52:09 GMT+00:00 2006, Uncontrolled Copy, (c) B
2、SI BS EN ISO 9969:1995 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemistry, was published under the authority of the Standards Board and comes into effect on 15 May 1995 BSI 07-1999 The following BSI references relate to the work on this st
3、andard: Committee reference PRI/61 Draft for comment 90/43733 DC ISBN 0 580 24129 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/61, Plastics piping systems and components, upon which the following bodies were repr
4、esented: British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers Association British Valve and Acutator Manufacturers Association Department of the Environment (British Board of Agrment) Department of the Environment (Building Research Establishment) Department of the Env
5、ironment (Property and Buildings Directorate) Department of Transport Electricity Association Federation of Civil Engineering Contractors Health and Safety Executive Institute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engineers Institution of Water
6、and Environmental Management National Association of Plumbing, Heating and Mechancial Services Contractors Pipeline Industries Guild Plastics Land Drainage Manufacturers Association Society of British Gas Industries Society of British Water Industries Water Companies Association Water Services Assoc
7、iation 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 Technology Ltd. Amendments issued since publication Amd. No.DateComments Licensed
8、Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:52:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9969:1995 BSI 07-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1Scope3 2Symbols3 3Principle3 4Apparatus3 5Test pieces4 6Conditioning5 7Procedure5 8
9、Calculation of ring stiffness6 9Test report6 Figure 1 Example of a device for measuring the inside diameter of a corrugated pipe3 Figure 2 Test piece cut out of a perpendicularly ribbed pipe4 Figure 3 Test piece cut out of a helically wound pipe4 Figure 4 Examples of the pipe-wall height ec5 Figure
10、5 Method of correcting the origin6 Table 1 Deflection speeds3 Table 2 Number of length measurements4 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:52:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9969:1995 ii BSI 07-1999 National foreword This British Standard has been prepared
11、 under the direction of the Sector Board for Materials and Chemicals and is the English language version of EN ISO 9969:1995 Thermoplastics pipes Determination of ring stiffness, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of testing plastic
12、s Part 11: Thermoplastics pipes, fittings and valves, as Method 1114B:1995, for association with related test methods for plastics materials and plastics piping components. This test method has been accepted for reference by other standards under preparation by CEN for specification of plastics pipi
13、ng systems and components. It has been implemented to enable experience of the 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
14、 specification which contains or makes reference to a different test method until this standard/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate. WARNING NOTE. This British Standard, which is the English language version of EN ISO
15、9969:1995, does not necessarily 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 trained personnel. A British Standard does not purpor
16、t 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 cover, an inside front cov
17、er, pages i and ii, the EN ISO title page, pages 2 to 6 and a back cover. This standard has been updated (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, Sat Nov 18 15:5
18、2:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9969 February 1995 ICS 23 040.20 Descriptors: Plastics products, thermoplastic resins, plastics tubes, tests, stiffness tests, circular letter English version Thermoplastic pipes Determination of
19、 ring stiffness (ISO 9969:1994) Tubes en matires thermoplastiques Dtermination de la rigidit annulaire (ISO 9969:1994) Thermoplastische Rohre Bestimmung der Ringsteifigkeit (ISO 9969:1994) This European Standard was approved by CEN on 1994-11-21. CEN members are bound to comply with the CEN/CENELEC
20、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 such national standards may be obtained on application to the Central Secretariat or to any CEN m
21、ember. 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 language and notified to the Central Secretariat has the same status as the official versions. CEN memb
22、ers are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisch
23、es Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to CEN members Ref. No. EN ISO 9969:1995 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:52:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9969:1995 BSI 07-1999 2 Foreword This Eu
24、ropean Standard was taken over by the Technical Committee CEN/TC 155, Plastics piping and ducting systems, from the work of ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, of the International Organization for Standardization (ISO). This European Standard shall be given
25、the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 1995, and conflicting national standards shall be withdrawn at the latest by August 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to i
26、mplement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:52:09 GMT+00:00 2006, Uncontrolled C
27、opy, (c) BSI EN ISO 9969:1995 BSI 07-19993 1 Scope This International Standard specifies a method of determining the ring stiffness of thermoplastics pipes having a circular cross-section. 2 Symbols The following symbols are used in this International Standard: 3 Principle The ring stiffness is dete
28、rmined by measuring the force and the deflection while deflecting the pipe at a constant rate. A length of pipe supported horizontally is compressed vertically between two parallel flat plates moved at a constant speed which is dependent upon the diameter of the pipe. A plot of force versus deflecti
29、on is generated. The ring stiffness is calculated as a function of the force necessary to produce a deflection of 0,03di diametrically across the pipe. 4 Apparatus 4.1 Compressive-testing machine, capable of a constant rate of crosshead movement adjustable as appropriate to the nominal diameter of t
30、he pipe in conformance with Table 1, with sufficient force and travel to produce the specified deflection (see clause 7) via a pair of parallel plates (4.2). Table 1 Deflection speeds 4.2 Two steel plates, through which the compressive force can be applied to the test piece. The plates shall be flat
31、, smooth and clean and shall not deform during the test to an extent that would affect the results. The length of each plate shall be at least equal to the length of the test piece. The width of each plate shall be not less than the maximum width of the surface in contact with the test piece while u
32、nder load plus 25 mm. 4.3 Measuring devices, capable of determining the length of the test piece to within 1 mm (see 5.2); the inside diameter of the test piece to within 0,5 %; the change in inside diameter of the test piece in the direction of loading with an accuracy of 0,1 mm, or 1 % of the defl
33、ection, whichever is the greater. An example of a device for measuring the inside diameter of corrugated pipes is shown in Figure 1. 4.4 Force-measuring device, capable of determining to within 2 % the force necessary to produce a 1 % to 4 % deflection of the test piece diametrically across the test
34、 piece. Units dnnominal diameter of pipemm diinternal diameter of pipe test piecem Floading forcekN Llength of test piecem Sring stiffness kN/m2 yvertical deflectionm Nominal diameter dn of pipe mm Deflection speed mm/min dn k 1002 0,4 100 1 00050 5 Figure 1 Example of a device for measuring the ins
35、ide diameter of a corrugated pipe Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:52:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9969:1995 4 BSI 07-1999 5 Test pieces 5.1 Marking and number of test pieces The pipe for which the ring stiffness is to be determined shall be marked on
36、 the outside along its full length with a line along one generatrix. Three test pieces, a, b and c, respectively, shall be taken from this marked pipe such that the ends of the test pieces are perpendicular to the pipe axis and their lengths conform to 5.2. 5.2 Length of test pieces 5.2.1 The length
37、 of each test piece shall be determined by calculating the arithmetic mean of three to six length measurements equally spaced around the perimeter of the pipe as given in Table 2. The length of each test piece shall conform to 5.2.2, 5.2.3, 5.2.4 or 5.2.5, as applicable. Table 2 Number of length mea
38、surements Each of the three to six length measurements shall be made to within 1 mm. For each individual test piece, the smallest of the three to six length measurements shall not be less than 0,9 times the largest measurement. 5.2.2 For pipes that have nominal diameters less than or equal to 1 500
39、mm, the average length of each test piece shall be 300 mm 10 mm. 5.2.3 For pipes that have nominal diameters greater than 1 500 mm, the average length, in millimetres, of each test piece shall be at least 0,2dn. 5.2.4 Structured-wall pipes with perpendicular ribs or corrugations or other regular str
40、uctures shall be cut such that each test piece contains the minimum whole number of ribs, corrugations or other structures necessary to satisfy the requirement on length given in 5.2.2 or 5.2.3, as applicable (see Figure 2). The cuts shall be made at the mid-point between the ribs, corrugations or o
41、ther structures. 5.2.5 For helically wound pipes (see Figure 3), the length of each test piece shall be such that it contains the minimum whole number of helical windings necessary to satisfy the requirement on length given in 5.2.2 or 5.2.3, as applicable. For pipes with helical stiffeners in the f
42、orm of ribs, corrugations, etc., the length of each test piece shall be such that it comprises a whole number of stiffeners, with a minimum of three, and shall conform to 5.2.2 or 5.2.3, as applicable. Nominal diameter dn of the pipe mm Number of length measurements dn k 2003 200 dn 5004 dn U 5006 F
43、igure 2 Test piece cut out of a perpendicularly ribbed pipe Figure 3 Test piece cut out of a helically wound pipe Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:52:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9969:1995 BSI 07-19995 5.3 Inside diameter of test pieces Determine the
44、inside diameters dia, dib and dic of the respective test pieces a, b and c (see 5.1) as the arithmetic mean of four measurements obtained at 45 intervals on one cross-section at mid-length, each measurement being made to within 0,5 %. Record the calculated mean inside diameter dia, dib and dic for e
45、ach test piece a, b and c, respectively. Calculate the average value diof these three values using the following equation: 5.4 Age of test pieces At the start of the test, the age of the test pieces shall be at least 24 h. For type testing, and in cases of dispute, the age of the test pieces shall b
46、e 21 days 2 days. 6 Conditioning Condition the test pieces in air at the test temperature (see 7.1 ) for at least 24 h immediately prior to testing. 7 Procedure 7.1 Unless otherwise specified in the referring standard, carry out the test procedure at 23 C 2 C or, in countries where 27 C is used as t
47、he standard laboratory temperature, at 27 C 2 C. In cases of dispute, 23 C 2 C shall be used. NOTE 1It is probable that the test temperature has an influence on the ring stiffness. 7.2 If it can be determined in which position the test piece has the lowest ring stiffness, place the first test piece
48、a in this position in the compressive-testing machine. Otherwise, place the first test piece in such a way that the marking line is in contact with the upper plate. Rotate the two others b and c by 120 and 240, respectively, in relation to the first test piece when placing them in the testing machin
49、e. 7.3 For each test piece, attach the deflection gauge and check the angular position of the test piece with respect to the upper plate. Position the test piece with its longitudinal axis parallel to the plates and centre it laterally in the testing machine. Bring the upper plate in contact with the test piece with no more force than is needed to hold it in position. Compress the test piece at the constant speed specified in Table 1, while continuously recording force and deflection in conformance