BS EN ISO 13479-2009 Polyolefin pipes for the conveyance of fluids - Determination of resistance to crack propagation - Test method for slow crack growth on notched pipes《流体输送用聚烯烃管.pdf

1、BS EN ISO13479:2009ICS 23.040.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPolyolefin pipes for theconveyance of fluids Determination ofresistance to crackpropagation Testmethod for slow crackgrowth on notchedpipes (ISO 13479:2009)This British Standardwas p

2、ublished underthe authority of theStandards Policy andStrategy Committee on 30November 2009. BSI 2009ISBN 978 0 580 63079 8Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 13479:2009National forewordThis British Standard is the UK implementation of EN ISO 13479:2009.It supersedes

3、 BS EN ISO 13479:1997 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/88/4, Test methods.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary

4、provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13479 September 2009 ICS 23.040.20 Supersedes EN ISO 13479:1997English Version Polyolefi

5、n pipes for the conveyance of fluids - Determination of resistance to crack propagation - Test method for slow crack growth on notched pipes (ISO 13479:2009) Tubes en polyolfines pour le transport des fluides - Dtermination de la rsistance la propagation de la fissure - Mthode dessai de la propagati

6、on lente de la fissure dun tube entaill (essai dentaille) (ISO 13479:2009)Rohre aus Polyolefinen fr den Transport von Fluiden - Bestimmung des Widerstandes gegen Rifortpflanzung - Prfverfahren fr langsames Riwachstum an gekerbten Rohren (Kerbprfung) (ISO 13479:2009) This European Standard was approv

7、ed by CEN on 19 August 2009. 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 such national s

8、tandards may be obtained on application to the CEN Management Centre 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 language and notifi

9、ed to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt

10、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of explo

11、itation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 13479:2009: EBS EN ISO 13479:2009EN ISO 13479:2009 (E) 3 Foreword This document (EN ISO 13479:2009) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the trans

12、port of fluids“ in collaboration with Technical Committee CEN/TC 155 “Plastics piping systems and ducting systems” the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the la

13、test by March 2010, and conflicting national standards shall be withdrawn at the latest by March 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all suc

14、h patent rights. This document supersedes EN ISO 13479:1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland

15、, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 13479:2009 has been approved by CEN as a EN ISO

16、 13479:2009 without any modification. BS EN ISO 13479:2009ISO 13479:2009(E) ISO 2009 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is n

17、ormally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part i

18、n the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prep

19、are International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that s

20、ome of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 13479 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 5, Gen

21、eral properties of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications. This second edition cancels and replaces the first edition (ISO 13479:1997), which has been technically revised. BS EN ISO 13479:2009BS EN ISO 13479:2009INTERNATIONAL STAND

22、ARD ISO 13479:2009(E) ISO 2009 All rights reserved 1Polyolefin pipes for the conveyance of fluids Determination of resistance to crack propagation Test method for slow crack growth on notched pipes 1 Scope This International Standard specifies a test method for determining the resistance to slow cra

23、ck growth of polyolefin pipes, expressed in terms of time to failure in a hydrostatic pressure test on a pipe with machined longitudinal notches in the outside surface. The test is applicable to pipes of wall thickness greater than 5 mm. 2 Normative references The following referenced documents are

24、indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 161-1, Thermoplastics pipes for the conveyance of fluids Nominal outside diameters a

25、nd nominal pressures Part 1: Metric series ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determi

26、nation of the resistance to internal pressure Part 2: Preparation of pipe test pieces ISO 3126, Plastics piping systems Plastics components Determination of dimensions ISO 6108, Double equal angle cutters with plain bore and key drive ISO 11922-1, Thermoplastics pipes for the conveyance of fluids Di

27、mensions and tolerances Part 1: Metric series 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 161-1 and ISO 11922-1 apply. 4 Principle Lengths of pipe with four machined longitudinal external notches are subject to a hydrostatic pressure test whilst

28、immersed in a water tank at 80 C in accordance with ISO 1167-1 and ISO 1167-2. The time to failure or test period is recorded. NOTE It is assumed that the following test parameters are set by the standard or specification making reference to this International Standard: a) the number of test pieces,

29、 if applicable (see 6.5); b) the test pressure (see 8.1); c) the test period (see 8.1). BS EN ISO 13479:2009ISO 13479:2009(E) 2 ISO 2009 All rights reserved5 Apparatus 5.1 Pipe pressure-testing equipment, as specified in ISO 1167-1. 5.2 Notch-machining equipment, i.e. a milling machine with a horizo

30、ntal mandrel rigidly fixed to the bed to enable the pipe to be securely clamped to give a straight test piece. The mandrel shall support the pipe bore beneath and along the full length of the notch to be machined. The milling cutter mounted on a horizontal arbor shall be a 60 included-angle V-cutter

31、 conforming to ISO 6108, having a cutting rate of (0,010 0,002) (mm/r)/tooth (see example). EXAMPLE A cutter with 20 teeth rotating at 700 r/min, traversed at a speed of 150 mm/min, has a cutting rate of 150/(20 700) = 0,011 (mm/r)/tooth. The milling cutter shall be carefully protected against damag

32、e. The cutter shall be subject to a running-in treatment amounting to 10 m of notching prior to its first use for the preparation of test pieces. It shall not be used for any other material or purpose and shall be replaced after 500 m of notching. The cutter shall be checked for damage or wear after

33、 each 100 m of cutting. The cutter teeth shall be compared with a new cutter by examination with a microscope using a magnification of 10 to 20 times. If there is any evidence of damage or wear it shall be replaced. 6 Test piece preparation 6.1 General Prior to any measurements the test piece shall

34、be conditioned at (23 2) C for at least 4 h. 6.2 Test pieces Each test piece shall comprise a length of pipe sufficient to give a minimum free length of pipe of (3dn 5) mm between the end caps, when fitted for pressure testing in accordance with ISO 1167-2, where dnis the nominal outside diameter of

35、 the pipe. For pipes with a nominal outside diameter dn 315 mm, a minimum free length of (3dn 5) mm shall be used where practicable; otherwise, a minimum free length of greater than or equal to 1 000 mm shall be used. Type A end caps in accordance with ISO 1167-1 shall be used. NOTE The use of pipes

36、 less than (3dn 5) mm and notch lengths of less than the nominal outside diameter is subject to further study. 6.3 Notch location and measurement of dimensions Positions shall be marked for machining four notches equally spaced around the pipe circumference (see Figure 1). Measure the mean outside d

37、iameter, dem, of the test pipe and the wall thickness of the pipe in the centre of the pipe at each notch position in accordance with ISO 3126. 6.4 Machining the notches 6.4.1 If the wall thickness of the test piece is greater than 50 mm, the material shall be machined with a slot drill of 15 mm to

38、20 mm diameter to leave approximately 10 mm to be removed by the V-cutter, used in accordance with 6.4.2. 6.4.2 Each notch shall be machined by climb milling (see Figure 2) to such a depth as to produce a pipe wall ligament thickness of between 0,78 and 0,82 times the minimum wall thickness, as spec

39、ified in ISO 11922-1, for the diameter and pressure series of the pipe as shown in Table A.1 (see Note in this subclause). The ends of each notch shall be aligned circumferentially as shown in Figure 1 and Figure 2. BS EN ISO 13479:2009ISO 13479:2009(E) ISO 2009 All rights reserved 3The length of ea

40、ch notch, at full depth, shall be equal to the pipe nominal outside diameter 1 mm. For pipes greater than 315 mm in diameter with a free length of pipe of less than (3 dn 5) mm, the length of each notch, at full depth, shall be equal to the free length minus (500 1) mm, in accordance with 6.2. NOTE

41、To achieve a remaining ligament within the required tolerance range, it is advisable to aim for a remaining ligament at the maximum of the tolerance range. This is because the pipe wall can move due to the release of residual stresses, resulting in a deeper than anticipated notch. 6.4.3 Measure and

42、record the depth of each notch and the ligament thickness, lg. NOTE 1 Measurement can be facilitated through the use of a dial gauge with a narrow angle tip mounted in a V-block. NOTE 2 When difficulty is encountered in measuring the ligament thickness of thick walled pipe, reference is made to the

43、method specified in 8.2. 6.4.4 The test piece shall have end caps fitted, which ensure that any longitudinal internal pressure load will act fully on the pipe (e.g. as shown for the type A arrangement in ISO 1167-2). Key 1 end cap lgligament thickness: 0,78 to 0,82 times minimum ISO wall thickness,

44、in millimetres Figure 1 Pipe test piece BS EN ISO 13479:2009ISO 13479:2009(E) 4 ISO 2009 All rights reservedKey 1 pipe wall 2 60 double equal angle cutter h notch depth, in millimetres lnnotch length (1 dn) centred on test piece aDirection. Figure 2 Notching method 6.5 Number of test pieces Prepare

45、a minimum of three test pieces, unless specified otherwise in the referring standard. 7 Conditioning The test pieces shall be filled with water, immersed in a water tank at 80 C and allowed to condition in accordance with the conditioning time stated in ISO 1167-1 for the pipe wall thickness. 8 Proc

46、edure 8.1 Hydrostatic-pressure testing 8.1.1 Pressurize the test piece with water in accordance with ISO 1167-1 at a test temperature of 80 C, applying and maintaining the pressure specified by the referring standard. 8.1.2 Connect the test piece(s) to the pressurizing equipment and bleed off the ai

47、r. After conditioning in accordance with Clause 7, progressively and smoothly apply the test pressure, in the shortest time practicable between 30 s and 1 h, depending upon the size of the test piece and the capability of the pressurizing equipment. 8.1.3 Maintain the pressure until either the test

48、piece ruptures or the time specified by the referring standard has elapsed, whichever occurs first. Record the time under pressure to the nearest hour. In the case of failure, record the location of the failure for each test piece. NOTE Table B.1 gives applicable pressure levels, dependent on materi

49、al type and pipe series. BS EN ISO 13479:2009ISO 13479:2009(E) ISO 2009 All rights reserved 58.2 Ligament thickness measurement after testing Measurement after testing should be carried out if premature failure has occurred. The following method is recommended. On completion of the pressure test, remove the test piece from the water tank and allow to cool to ambient temperature. Cut a section of pipe out from around the position of each notch. Open up the notch to give clear access to one