BS EN ISO 13477-2008 Thermoplastics pipes for the conveyance of fluids - Determination of resistance to rapid crack propagation (RCP) - Small-scale steady-state test (S4 test)《流体输送.pdf

1、BS EN ISO13477:2008ICS 23.040.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDThermoplastics pipesfor the conveyance offluids Determinationof resistance to rapidcrack propagation(RCP) Small-scalesteady-state test (S4test) (ISO 13477:2008)This British Standardw

2、as published underthe authority of theStandards Policy andStrategy Committee on 30September 2008 BSI 2008ISBN 978 0 580 58717 7Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 13477:2008National forewordThis British Standard is the UK implementation of EN ISO 13477:2008.The UK pa

3、rticipation 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 provisionsof a contract. Users are responsible for

4、 its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 13477March 2008ICS 23.040.20English VersionThermoplastics pipes for the conveyance of fluids -Determination of resistance to rapid crack prop

5、agation (RCP) -Small-scale steady-state test (S4 test) (ISO 13477:2008)Tubes en matires thermoplastiques pour le transport desfluides - Dtermination de la rsistance la propagationrapide de la fissure (RCP) - Essai petite chelle tatconstant (essai S4) (ISO 13477:2008)Rohre aus Thermoplasten fr den Tr

6、ansport von Fluiden -Bestimmung des Widerstandes gegenber schnellerRissfortpflanzung (RCP) - Laborprfung (S4-Prfung) (ISO13477:2008)This European Standard was approved by CEN on 7 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions f

7、or giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official

8、 versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgi

9、um, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STA

10、NDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 13477:2008: EBS EN ISO 13477:2008EN ISO 13477:200

11、8 (E) 3 Foreword This document (EN ISO 13477:2008) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport of fluids“ in collaboration with Technical Committee CEN/TC 155 “Plastics piping systems and ducting systems” the secretariat of which is held

12、 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 latest by September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008. Attention is drawn to the possibilit

13、y 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 such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bou

14、nd to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, S

15、witzerland and the United Kingdom. Endorsement notice The text of ISO 13477:2008 has been approved by CEN as a EN ISO 13477:2008 without any modification. BS EN ISO 13477:2008ISO 13477:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms an

16、d definitions. 1 4 Symbols and abbreviated terms . 1 5 Principle. 2 6 Test parameters 2 7 Apparatus 3 7.1 General. 3 7.2 Containment cage. 3 7.3 Gauge length . 3 7.4 Decompression baffles 4 7.5 Crack-initiation equipment 4 7.6 End caps 4 8 Test pieces 5 9 Conditioning 5 10 Test procedure 5 11 Interp

17、retation of results 5 12 Test report . 6 Annex A (normative) Determination of critical pressure (or hoop stress). 7 Annex B (normative) Determination of critical temperature 11 Annex C (informative) Critical pressure correlation between S4 and full-scale tests for PE pipes 12 Annex D (informative) F

18、luid decompression and effect on RCP Theoretical analysis 13 Bibliography . 15 BS EN ISO 13477:2008ISO 13477:2008(E) iv ISO 2008 All rights reservedForeword IISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work

19、of preparing International Standards is normally 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-government

20、al, in liaison with ISO, also take part in 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 mai

21、n task of technical committees is to prepare 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. Att

22、ention is drawn to the possibility that some 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 13477 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the tr

23、ansport of fluids, Subcommittee SC 5, General 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 13477:1997), which has been technically revised. BS EN ISO 13477:20

24、08INTERNATIONAL STANDARD ISO 13477:2008(E) ISO 2008 All rights reserved 1Thermoplastics pipes for the conveyance of fluids Determination of resistance to rapid crack propagation (RCP) Small-scale steady-state test (S4 test) 1 Scope This International Standard specifies a small-scale (S4) test method

25、 for determining the arrest or propagation of a crack initiated in a thermoplastics pipe at a specified temperature and internal pressure. This International Standard is applicable to the assessment of the performance of thermoplastics pipes intended for the supply of gases or liquids. In the latter

26、 case, air can also be present in the pipe. NOTE This test method was developed using monolayer thermoplastics pipes. Its applicability to multi-layer/coated pipes has yet to be fully confirmed and is under study. 2 Normative references The following referenced documents are indispensable for the ap

27、plication 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 and nominal pressures Par

28、t 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 3126, Plastics piping systems Plastics components Determination of dimensions ISO 11922-1, Thermoplastics pipes fo

29、r the conveyance of fluids Dimensions and tolerances Part 1: Metric series 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 161-1 and ISO 11922-1 apply. 4 Symbols and abbreviated terms di,minminimum internal diameter, in millimetres, of

30、pipe dnnominal external diameter, in millimetres, of pipe ennominal wall thickness, in millimetres, of pipe BS EN ISO 13477:2008ISO 13477:2008(E) 2 ISO 2008 All rights reservedlclongitudinal crack length, in millimetres, on the outer surface of the pipe specimen, measured from the centre of the stri

31、ker blade RCP rapid crack propagation SDR standard dimension ratio (dn/en) T nominal test temperature, in degrees Celsius, as specified by referring standard Tcondconditioning temperature, in degrees Celsius, of pipe (see Clause 9) 5 Principle A section of thermoplastics test pipe of specified lengt

32、h, conditioned to a specified test temperature and containing a fluid at a specified test pressure, is subjected to an impact near one end, designed to initiate a fast-running longitudinal crack. The crack-initiation process itself is designed so that it disturbs the test pipe as little as possible.

33、 The test temperature and/or test pressure are as defined in the referring standard. The fluid or mixture of fluids is identical to that used in the intended application, or is a substitute fluid which gives equivalent results. The temperature of the fluid is between the test temperature and the lab

34、oratory temperature. Rapid decompression ahead of the propagating crack is retarded by internal baffles and by an external cage which restricts flaring of the test pipe at the edges of the fracture. Retardation of decompression maintains the crack tip stress at a level approaching that of the hoop s

35、tress in the pipe developed by internal pressure. This technique achieves steady-state RCP in a short pipe specimen at a lower pressure than that necessary to achieve propagation in the same pipe using a full-scale test (FST). The test pipe is subsequently examined to determine whether arrest or pro

36、pagation of the crack has occurred. From a series of such tests at different pressures but at a constant temperature, the critical pressure or critical hoop stress for RCP can be determined (see Annex A). Similarly, by testing at a series of temperatures but at a constant pressure or hoop stress, th

37、e critical temperature for RCP can be determined (see Annex B). This test involves fracture of a pipe test piece pressurized with a compressible fluid, normally air. Therefore, the appropriate safety precautions should be taken with respect to noise and the risk of flying debris. 6 Test parameters I

38、t is assumed that the following parameters will be set by the referring product standard: a) the diameter(s) and series of the pipe(s) to be tested; b) the pressurizing fluid(s), e.g. air, or air plus water and proportion; c) the test pressure(s); d) the test temperature(s), see Clause 9. BS EN ISO

39、13477:2008ISO 13477:2008(E) ISO 2008 All rights reserved 37 Apparatus 7.1 General The apparatus shall generally comply with Figure 1, with essential features as specified in 7.2 to 7.6. The apparatus shall be located in a laboratory maintained at a temperature of no more than 25 C. The test should b

40、e carried out in still air to avoid significant change of the pipe surface temperature. Key 1 striker blade 2 anvil 3 test pipe 4 containment-cage rings 5 decompression baffle aAnvil zone. bGauge length ( 5dn). Figure 1 Apparatus for S4 test 7.2 Containment cage The containment cage shall allow free

41、 expansion of the test pipe during pressurization, but shall restrict radial expansion during fracture to within a maximum diameter of (1,1 0,04)dnat all points round the circumference. The cage rings shall not touch or be supported by the test pipe and shall be concentric with it. Within the region

42、 between the crack-initiation point and the end of the gauge length, the pitch of the containment rings shall be (0,35 0,05)dnand the longitudinal width of each ring shall be (0,15 0,05)dn. 7.3 Gauge length The gauge length shall be greater than 5dn. At least 70 % of its internal volume shall be occ

43、upied by pressurized air that can expand without restriction to drive the test pipe wall radially outwards. Instrumentation shall be provided to measure the static pressure inside the test pipe to an accuracy of 2 %. BS EN ISO 13477:2008ISO 13477:2008(E) 4 ISO 2008 All rights reserved7.4 Decompressi

44、on baffles The decompression baffles shall be (0,95 0,01) di,minin diameter. The pitch of the baffles shall be ddn0n0,10, 4 . Baffles should be of a material and thickness sufficient to withstand the forces expected during the test without significant distortion. 7.5 Crack-initiation equipment The l

45、ength of the striker-blade edge shall be (0,40 0,05)dn. The height of the blade shall be greater than the nominal wall thickness, en, of the test pipe (see Figure 2). The blade shall not penetrate more deeply than 1ento 1,5enfrom the outer surface of the test pipe and the striker shall not directly

46、impact the outside surface of the test pipe with any point other than the blade itself. An internal anvil of circular cross-section shall ensure that the inner surface of the test pipe cannot deform, under impact of the blade, to a diameter of less than (0,98 0,01)di,minthroughout the anvil zone. A

47、slot shall be provided in the anvil to ensure that the blade is not damaged during crack initiation. The volume of this slot shall not exceed 1 % of d3n/4. aThickness. bLength = (0,4 0,05)dn. cHeight en. Figure 2 Striker-blade geometry 7.6 End caps End caps ensuring a leaktight seal shall be fitted

48、over each end of the test pipe. The end caps should not introduce any additional hoop stress in the pipe. BS EN ISO 13477:2008ISO 13477:2008(E) ISO 2008 All rights reserved 58 Test pieces The test pieces shall be straight sections of pipe of length lt, where 7dnu ltu 8dn. The ends shall be square to

49、 the test pipe axes. The test pipe surfaces along the gauge length shall not be prepared or treated in any way. The crack-initiation end may be chamfered to facilitate fitting of the test pipe. When difficulty is encountered in the initiation of a satisfactory crack (see 10.1) during the test, notching of the internal surface of the test pipe in the axial direction along the anvil zone may be carried out. The notch shall be positioned under the point of impact and shall not be extended into