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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12271998 BS 2782-12 1214F 1998 The European Standard EN 12271997 has the status of a British Standard ICS 23.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plastics piping systems Glass-reinforced thermosetting plastics GRP pipes Determination of the long-term ultimate relative ring deflection under wet conditions 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 May 1998 BSI 1998 ISBN 0 580 29124 3 BS EN 12271998 Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 12271997. The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping systems and components, which has the responsibility to aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests ined; monitor related international and European developments and 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 also incorporated into BS 2782-12 s of testing plastics Part 12 Reinforced plastics pipes, fittings and valves, as 1214F1998, for association with related test s 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 until that standard/specification has been amended or revised to make reference to this and adjust any requirements as appropriate. NOTE In Table A.3 of this English language version, the value of LCL given for test piece 18, shown in the ratified text of EN 1227 as 22,9.5, has been corrected to read 22,905; and the value of Zugiven for test piece 9, shown in the ratified text as 0,11, has been corrected to read 1,11. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. WARNING. This British Standard, which is identical with EN 12271997, 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 should be pered only by trained personnel. A British Standard does not purport 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 cover, the EN title page, pages 2 to 14, an inside back cover and a back cover. CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any and by any means reserved worldwide for CEN national Members. Ref. No. EN 12271997 E EUROPEAN STANDARDEN 1227 NORME EUROPE ENNE EUROPA ISCHE NORM December 1997 ICS 23.040.20 Descriptors Pipelines, plastic pipes, reinforced plastics, glass-reinforced plastics, thermosetting resins, mechanical tests, ultimate ring deflection, long-term, test conditions English version Plastics piping systems Glass-reinforced thermosetting plastics GRP pipes Determination of the long-term ultimate relative ring deflection under wet conditions Syste mes de canalisations en plastique Tubes en plastique thermodurcissable renforce de verre PRV De termination de la de flexion annulaire relative ultime, a long terme, en conditions mouille es Kunststoff-Rohrleitungssysteme Rohre aus glasfaserversta rkten duroplastischen Kunststoffen GFK Ermittlung der relativen Langzeit-Ringverbarkeit unter Feuchteeinflu This European Standard was approved by CEN on 16 August 1997. 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 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 language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 12271997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 155, Plastics piping systems and ducting systems, the secretariat of which is held by NNI. This standard is based on the draft proposal for an International Standard ISO/DP 10471.2 Glass-reinforced thermosetting plastics GRP pipes and fittings Determination of the long-term ultimate ring deflection of pipes under wet conditions, prepared by the International Organization for Standardization ISO. It is a modification of ISO/DP 10471.2 for reasons of possible applicability to other test conditions and alignment with texts of other standards on test s. The modifications are the slope of the logarithm lg of the vertical deflection versus lg [time] is not used as a failure criterion; test parameters are not specified; material-dependent or perance requirements are not given; editorial changes have been introduced. The material-dependent test parameters and/or perance requirements are incorporated in the referring standard. Annex A, which is normative, is an example using the procedures described in 8.5. This standard is one of a series of standards on test s which support system standards for plastics piping systems and ducting systems. 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 June 1998, and conflicting national standards shall be withdrawn at the latest by June 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Principle4 5Apparatus4 6Test pieces6 7Conditioning6 8Procedure6 9Calculation8 10Test report8 Annex A normative Example calculation for validation of procedures9 w w w . b z f x w . c o m Page 3 EN 12271997 BSI 1998 1 Scope This standard specifies a for determining by extrapolation the long-term ultimate relative ring deflection of glass-reinforced thermosetting plastics GRP pipes under wet conditions. Two s of loading are given, depending upon the use of plates or beam bars. NOTEEither may be used for measurements of relative deflection up to 28 . When it is expected that this level is exceeded, then the procedure is limited to the use of beam bars. 2 Normative references This standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to, or revisions of, any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 7051994, Plastics piping systems Glass-reinforced thermosetting plastics GRP pipes and fittings s for regression analyses and their use 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 vertical compressive load F the vertical load applied to a horizontal pipe to cause a vertical deflection it is expressed in newtons 3.2 vertical deflection y the vertical change in diameter of a horizontal pipe in response to a vertical compressive load it is expressed in metres 3.3 mean diameter dm the diameter of the circle corresponding with the middle of the pipe wall cross-section it is given, in metres, by either of the following equations dm di eA dm de2 eA where diis the average of the measured internal diameters see 6.3.3, in metres; deis the average of the measured external diameters see 6.3.3, in metres; eAis the average of the measured wall thicknesses of the pipe see 6.3.2, in metres NOTEFor the purpose of this definition and to avoid confusion, the symbol eA is used to represent the wall thickness of the pipe. Elsewhere in this standard for consistency with EN 705, the symbol e is used for one of a series of coefficients used in polynomial equations. 3.4 relative vertical deflection y/dm the ratio of the vertical deflection, y see 3.2, to the mean diameter of the pipe, dmsee 3.3 3.5 ultimate vertical deflection under wet conditions yu,wet the vertical deflection see 3.2 under wet conditions when a failure occurs see 8.5 and clause 4 it is expressed in metres 3.6 ultimate relative vertical deflection under wet conditions yu,wet/dm the ratio of the ultimate vertical deflection under wet conditions see 3.5 to the mean diameter, dm, of the pipe see 3.3 3.7 long-term ultimate ring deflection under wet conditions yu,wet,x the value of the extrapolated ultimate vertical deflection under wet conditions see 3.5 at a time, x, specified in the referring standard it is expressed in metres 3.8 long-term ultimate relative ring deflection under wet conditions yu,wet,x/dm the ratio of the long-term ultimate ring deflection under wet conditions see 3.7 to the mean diameter, dm, of the pipe see 3.3 3.9 rate of vertical deflection r the rate of change in diameter in the vertical direction caused by the vertical compressive load see 3.1 it is expressed in metres per hour w w w . b z f x w . c o m Page 4 EN 12271997 BSI 1998 3.10 rate of vertical deflection at failure ru the value of r see 3.9 when failure occurs see 8.5 and clause 4 It is expressed in metres per hour. 3.11 failure loss of the structural integrity of the test piece as defined by either of the following conditions a rupture of the pipe wall; b if applicable see 8.5.2, estimated rupture of the pipe wall derived from the intersection of 1 the line described by the logarithm of the rate of deflection, lg r, versus the logarithm of time, lg t, as obtained from a series of vertical deflection/time points of an individual test piece, not yet ruptured [see equation 1]; and 2 the line as described by the logarithm of the rate of vertical deflection at rupture, lg ru, versus the logarithm of time, lg tu, derived from a series of test pieces [see equation 2], whereby the equations are the following lg r w 2 z lg w91 where w a b 3 z c 3 z2 d 3 z3 e 3 z4; w9 b 2 3c 3 z 33 d 3 z2 43 e 3 z3; z lg t; where a, b, c, d, eare coefficients; tis the time, in hours. lg ru f g 3 lg tu 2 tν3 su2 where f, gare coefficients; tνis Students t; suis the standard deviation of the values of lg ru. 3.12 time to failure tu the time elapsed until a failure occurs see 8.5 and 3.11 It is expressed in hours. 3.13 deflection regression ratio RR,def the ratio between the extrapolated long-term 50 years property and the extrapolated short-term 6 min property based on deflection 3.14 strain regression ratio RR,str the ratio between the extrapolated long-term 50 years property and the extrapolated short-term 6 min property based on strain 3.15 strain factor Dg the factor used to trans a deflection value into a strain value at a certain point in time 4 Principle Each of several cut lengths of pipe, supported horizontally and under water, is subjected to a vertical load throughout its length such that each test piece is subject to a load which is different from that applied to any of the others. The resulting vertical deflections are recorded at given times. Depending upon the level of deflection and the time elapsed, cracks will be initiated and propagate to failure. The long-term ultimate ring deflection under wet conditions is obtained by extrapolation of the data in accordance with EN 705. A regression ratio for deflection is calculated relative to a specific short-term deflection, and this can be converted, if required, to a regression ratio based on strain. NOTEIt is assumed that the following test parameters are set by the standard making reference to this standard a the time, x, to which the values are to be extrapolated see 3.7 and clauses 8 and 9; b the length and number of test pieces see clause 6; c the test temperature see 8.1; d if necessary, the distribution of the times to failure see note to 8.5. 5 Apparatus 5.1 Compressive loading machine, comprising a system capable of applying a load without shock, through two parallel load application surfaces coning to 5.2, so that a horizontally orientated test piece of pipe, coning to clause 6 and immersed in water in accordance with 8.3, can be compressed vertically and maintained under constant load in accordance with 8.3. NOTEFor test pieces subjected to high predetermined loads, for which failure is expected to occur within 100 h, an automatic recording device will help pinpoint failure times accurately. 5.2 Load application surfaces, as described in 5.2.1 to 5.2.3. w w w . b z f x w . c o m Page 5 EN 12271997 BSI 1998 Figure 1 Schematic diagram of the test arrangement 5.2.1 General arrangement The surfaces shall be provided by a pair of plates coning to 5.2.2 or a pair of beam bars conin
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