【英国标准word原稿】BS EN 1226-1996 塑料管道系统.玻璃增强热固性塑料管.验证初期环状物挠曲阻力的试验方法.doc

豆丁网：/kmust1british standardplastics piping systems glass-reinforced thermosetting plastics (grp) pipes test method to prove the resistance to initial ring definitionthe european standard en 1226 : 1996 has the status of abritish standardics 23.040.20| bs en1226 : 1996| bs 2782 :| part 12 :method 1214e :| 1996|第 1 页 共 15 页豆丁网：/kmust1no copying without bsi permission except as permitted by copyright lawbs en 1226 : 1996committees responsible for thisbritish standardthe preparation of this british standard was entrusted to technical committee pri/61, plastics piping systems and components, upon which the following bodies were represented:british gas plcbritish plastics federationbritish plumbing fittings manufacturers association british valve and actuator manufacturers association chartered institution of water and environmental management department of the environment (building board of agre ment)department of the environment (building research establishment) department of transportelectricity associationfederation of civil engineering contractorshealth and safety executive institute of building control institute of materials institution of civil engineers institution of gas engineersnational association of plumbing, heating and mechanical services contractorspipeline industries guildplastics land drainage manufacturers associationsociety of british gas industries society of british water industries water companies associationwater services association of england and walesthe following bodies were also represented in the drafting of the standard, through subcommittees and panels: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 on15 december 1996bsi 1996the following bsi references relate to the work on this standard:committee reference pri/61draft for comment 93/313471 dcisbn 0 580 26734 2association of consulting engineersengineering equipment and materials users associationinstitution of mechanical engineersrapra technology ltd.amd. no.datetext affectedamendments issued since publicationbs en 1226 : 1996contentspage committees responsible inside front cover national foreword ii methodforeword 21scope32definitions33principle34apparatus35test pieces56conditioning57procedure58test report6figures1schematic diagram of the test arrangement42schematic diagram of load versus time4bsi 1996ibs en 1226 : 1996national forewordthis british standard has been prepared by technical committee pri/61 and is the english language version of en 1226 : 1996 plastics piping systems glass-reinforced thermosetting plastics (grp) pipes test method to prove the resistance to initial ring deflection, published by the european committee for standardization (cen).it is incorporated into bs 2782 methods of testing plastics : part 12 : reinforced plastics pipes, fittings and valves, as method 1214e : 1996 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 reinforced plastics piping 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 specification which contains or makes reference to a different test method until that standard/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate.no existing british standard is superseded by this method.warning note. this british standard, which is identical with en 1226 : 1996 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.compliance with a british standard does not of itself confer immunity from legal obligations.iibsi 1996european standarden 1226norme europe enneeuropa ische normjune 1996ics 23.040.20descriptors: pipelines, plastic tubes, reinforced plastics, glass reinforced plastics, thermosetting resins, mechanical tests, measurements, flexing, mechanical strengthenglish versionplastics piping systems glass-reinforced thermosetting plastics (grp) pipes test method to prove the resistance to initial ring deflectionsyste mes de canalisations en plastique tubes en plastiques thermodurcissables renforce s deverre (prv) me thode dessai pour e tablir lare sistance a la de flexion annulaire initialekunststoff-rohrleitungssysteme rohre aus glasfaserversta rkten duroplastischenkunststoffen (gfk) verfahren zur u berpru fung der anfangs-ringverformbarkeitthis european standard was approved by cen on 1996-01-04. 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, denmark, finland, france, germany, greece, iceland, ireland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and united kingdom.ceneuropean committee for standardization comite europe en de normalisation europa isches komitee fu r normungcentral secretariat: rue de stassart 36, b-1050 brussels1996 all rights of reproduction and communication in any form and by any means reserved in all countries tocen and its members.ref. no. en 1226 : 1996 epage 5en 1226 : 1996forewordthis 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 european standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest bydecember 1996, and conflicting national standards shall be withdrawn at the latest by december 1996.this standard is based on the draft international standard iso/dis 10466 glass reinforced thermosetting plastics (grp) pipes and fittings test method for resistance to initial ring deflection of pipes prepared by the international organization forstandardization (iso). it is a modification ofiso/dis 10466 for reasons of applicability to other test conditions and alignment with texts of other standards on test methods.the modifications are: test parameters (pressure, time, temperature) are not specified; material-dependent or performance requirements are not given; editorial changes have been introduced. the material-dependent test parameters and/orperformance requirements are incorporated in thereferring standard.this standard is one of a series of standards on test methods which support system standards for plastics piping systems and ducting systems.according to the cen/cenelec internal regulations, the national standards organizations of the following countries are bound to implement this standard: austria, belgium, denmark, finland, france, germany, greece, ireland, iceland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland, united kingdom.bsi 19961 scopethis standard specifies a method for testing the ability of glass-reinforced thermosetting plastics (grp) pipes to withstand specified levels of initial ring deflection without displaying surface damage and/or structural failure.2 definitionsfor the purposes of this standard, the following definitions apply.2.1 vertical deflection (y)the vertical change, in diameter, of a pipe in a horizontal position in response to a vertical compressive load (see 7.3).it is expressed in metres.2.2 relative vertical deflection (y/dm)the ratio of the vertical deflection, y, (see 2.1) to the mean diameter of the pipe, dm, (see 2.3).2.3 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 + e dm = de 2 ewhere:di is the average of the measured internal diameters(see 5.3.2), in metres;de is the average of the measured external diameters(see 5.3.2), in metres;e is the average of the measured wall thickness of the pipe (see 5.3.1), in metres.2.4 structural failurea failure apparent in any of the following forms(see 7.3): interlaminar separation; tensile failure of the glass fibre reinforcement; buckling of the pipe wall; if applicable, separation of the thermoplastic liner from the structural wall.3 principlea piece of pipe supported horizontally is loaded throughout its length to compress it diametrically to two successive specified levels of vertical deflection (see figure 2). the pipe is inspected at the first deflection level for surface damage and/or structural failure and at the second deflection level for structural failure (see 2.4).note. it is assumed that the following test parameters are set by the standard making reference to this standard:a) the two deflection limits of the pipe (see 4.1 and 7.3);b) the length of the test pieces (see clause 5);c) the number of test pieces (see clause 5);d) the test temperature (see 7.1);e) the surface(s) of the test piece to be inspected for surface damage (see 7.3);f) the characteristics of surface damage and structural failure(see 7.3).4 apparatus4.1 compressive loading machine, comprising a system capable of applying a controlled rate of compression or a dead weight loading system, without shock, through two parallel load application surfaces conforming to 4.2 so that a horizontally orientated test piece of pipe conforming to clause 5 can be compressed vertically. the machine shall be able to achieve and sustain in accordance with the periods specified in 7.3 the deflections or relative vertical deflections specified in the referring standard.4.2 load application surfaces4.2.1 general arrangementthe surfaces shall be provided by a pair of plates (see 4.2.2), or a pair of beam bars (see 4.2.3), or a combination of one such plate and one such bar, with their major axes perpendicular to and centred on the direction of application of load f by the compressive loading machine, as shown in figure 1. the surfaces to be in contact with the test piece shall be flat, smooth, clean and parallel. plates and beam bars shall have a length at least equal to the test piece (see clause 5) and have a thickness such that visible deformation does not occur during the test.4.2.2 platesthe plate(s) shall have a width of at least 100 mm.4.2.3 beam barseach beam bar shall have rounded edges, a flat face (see figure 1) without sharp edges and a width dependent upon the pipe as follows:a) for pipes with a nominal size not greater thandn 300 the width shall be (20 2) mm;b) for pipes of nominal sizes greater than dn 300 the width shall be (50 5) mm.the beam bars shall be so constructed and supported that no other surface of the beam bar structure shall come into contact with the test piece during the test.figure 1. schematic diagram of the test arrangementfigure 2. schematic diagram of load versus time4.3 dimensional measuring devices, capable of determining: the necessary dimensions (length, diameter, wall thickness) to an accuracy of within 0,1 mm; the deflection of the test piece in the vertical direction to an accuracy of within 1,0 % of the maximum value.note. the maximum value of the change to be measured depends upon the vertical deflection or the relative vertical deflection specified in the referring standard.4.4 temperature measuring device, if applicable, capable of verifying conformity to the test temperature (see 7.1).5 test pieces5.1 preparationthe test piece shall be a complete ring cut from the pipe to be tested. the length of the test piece shall be as specified in the referring standard, with permissible deviations of 5 %.the cut ends shall be smooth and perpendicular to the axis of the pipe.two straight lines, to serve as reference lines, shall be drawn on the inside or the outside along the length of the test piece at 180 to each other.5.2 numberthe number of test pieces shall be as specified in the referring standard.5.3 determination of the dimensions5.3.1 wall thicknessmeasure to within 0,2 mm the wall thickness of the test piece at each end of each reference line. calculate the average wall thickness, e, in metres, ofthe four measured values.5.3.2 mean diametermeasure to an accuracy of within 0,5 mm either of the following.a) the internal diamter, di, of the test piece between each diametrically opposed pair of reference lines at their mid-length, e.g. by means of a calliper.b) the external diameter, de, of the test piece at the mid-points of the reference lines, e.g. by means of a circumferential wrap steel tape.calculate the mean diameter, dm, of the test pieceusing the values obtained for wall thickness and eitherthe internal or the external diameter (see 2.3).6 conditioningunless otherwise specified by the referring standard, store the test pieces for at least 0,5 h at the test temperature (see 7.1) prior to testing.7 procedure7.1 test temperatureconduct the following procedure at the temperature specified in the referring standard.7.2 choice of load application surfaces and positioning of the test pieceif one of the required relative deflection limits (for surface damage or for structural failure) is in excess of 28 %, use beam bars, otherwise use either plates and/or beam bars (see 4.2).place the test piece in contact with the upper and lower plate or beam bar (see 4.2.1) with the pair of diametrically opposed reference lines vertically aligned. ensure that the contact between the test piece and each bearing plate or beam bar is as uniform as possible and the plates and/or beam bars are not tilted laterally.7.3 application of load and measurement of deflection7.3.1 either compress or load the test piece at a constant rate so that the first minimum initial vertical deflection or minimum initial relative verticaldeflection specified in the referring standard is reached to an accuracy of 2,0 % of the specified deflection value in (2 0,5) min and record the correspondingload f1 (see figure 2).7.3.2 maintain this deflection for (2 0,25) min while inspecting the test piece without magnification for surface damage (see items e) and f) of the note to clause 3).record any observations of surface damage together with the corresponding deflection.7.3.3 increase the deflection using either a constant rate of compression or loading so that the second minimum initial vertical deflection or minimum initial relative vertical deflection is reached to an accuracy of within 2,0 % of the specified deflection valuein (2 0,5) min and record the corresponding load f maintain this deflection for (2 0,25) min with continuous monitoring and recording of the load applied (see figure 2) and continuous inspection of the test piece for structural failure (see item f) of the note to clause 3) in accordance with 2.4 unless otherwise specified.7.3.5 if an instantaneous drop in load has not been detected during the inspection period, record that failure has not occurred an