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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN ISO 1746:2001 The E
2、uropean Standard EN ISO 1746:2000 has the status of a British Standard ICS 23.040.20; 23.040.70 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Rubber or plastics hoses and tubing Bending tests Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 16:09:19 GMT+00:00 2006, Unc
3、ontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 April 2001 BSI 04-2001 ISBN 0 580 34805 9 BS EN ISO 1746:2001 Amendmen
4、ts issued since publication Amd. No.DateComments National foreword This British Standard is the official English language version of EN ISO 1746:2000. It is identical with ISO 1746:1998. It supersedes BS EN 21746:1993 which is withdrawn. The UK participation in its preparation was entrusted by Techn
5、ical Committee PRI/66, Rubber and plastics tubing, hoses and hose assemblies, to Subcommittee PRI/66/4, Methods of test, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposal
6、s for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and
7、CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section
8、entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. 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. Complia
9、nce 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 ISO title page, the EN ISO foreword page, the ISO title page, page ii, pages 1 to 6, the annex ZA page and a back cover. The BS
10、I copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 16:09:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1746 April 2000 ICS 23.040.20; 23.040.70Super
11、sedes EN 21746:1993 English version Rubber or plastics hoses and tubing - Bending tests (ISO 1746:1998, including technical corrigendum 1:1999) Tuyaux et tubes en caoutchouc ou en plastique - Essai de courbure (ISO 1746:1998, corrigendum technique 1:1999 compris) Gummi- oder Kunststoffschluche mit u
12、nd ohne Einlage - Biegeprfungen (ISO 1746:1998, einschlielich technischen Corrigendum 1:1999) This European Standard was approved by CEN on 7 March 2000. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the sta
13、tus 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
14、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,
15、France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels 20
16、00 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 1746:2000 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 16:09:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of the International Standard from Techn
17、ical Committee ISO/TC 45 “Rubber and rubber products“ of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies“, the secretariat of which is held by BSI. This European Stan
18、dard replaces EN 21746:1993. 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 October 2000, and conflicting national standards shall be withdrawn at the latest by October 2000. According to the CEN
19、/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
20、, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 1746:1998, including technical corrigendum 1:1999, has been approved by CEN as a European Standard without any modification. NOTE: Normative references to International Standards are listed in annex Z
21、A (normative). EN ISO 1746:2000 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 16:09:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI A Reference number ISO 1746:1998(E) INTERNATIONAL STANDARD ISO 1746 Third edition 1998-05-15 Rubber or plastics hoses and tubing Bending tests Tuyaux et tubes en
22、 caoutchouc ou en plastique Essais de courbure EN ISO 1746:2000 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 16:09:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(8991:6471 OSI ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national stand
23、ards bodies (ISO member bodies). The work 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 orga
24、nizations, governmental and non- governmental, 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. Draft International Standards adopted by the technical committees are
25、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. International Standard ISO 1746 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Hoses (rubber and
26、 plastics). This third edition cancels and replaces the second edition (ISO 1746:1983), which has been technically revised. EN ISO 1746:2000 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 16:09:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI LANOITANRETNI DRADNATS OSI)E(8991:6471 OSI 1 Rubber
27、or plastics hoses and tubing Bending tests WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish ap
28、propriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies two methods for the determination of the behaviour of rubber or plastics hoses or tubing when bent to a specified radius. Method A is suitable for hos
29、es and tubing of internal diameter up to about 80 mm; the size of the apparatus for testing hoses and tubing of larger bore sizes becomes excessive. The method also provides a means of measuring the force required to reach a specified bend radius, and the test may be carried out at a specified inter
30、nal pressure. In method B, the bending characteristics, including the force required for bending, may be determined over a range of temperatures from - 60 C to + 200 C. The nature of the apparatus, however, limits its applicability to hoses and tubing of small internal diameter, i.e. up to about 12,
31、5 mm. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based o
32、n this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 471:1995, Rubber Temperatures, humidities and times for conditi
33、oning and testing. ISO 4671:1), Rubber and plastics hose and hose assemblies Methods of measurement of dimensions. 3 Method A 3.1 Apparatus The apparatus consists of two guides A and B, guide A being fixed in a plane and guide B being movable in that plane, parallel to, and in line with, guide A (se
34、e figure 1). _ 1) To be published. (Revision of ISO 4671:1984) EN ISO 1746:2000 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 16:09:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI )E(8991:6471 OSI OSI 2 If it is desired to measure the force required to attain the specified radius of curvature
35、, this may be done, for example, by means of a system of pulleys and weights (see figure 2). Care shall be taken to minimize the effect of frictional resistance. 3.2 Test pieces 3.2.1 Types and dimensions The test pieces shall consist either of complete manufactured lengths of hose or of suitable te
36、st lengths. If the manufactured length is shorter than the length required for the test, test pieces of adequate length shall be specially manufactured. 3.2.2 Number Unless otherwise specified, two test pieces shall be tested. 3.3 Conditioning of test pieces No tests shall be carried out within 24 h
37、 of manufacture. For evaluations which are intended to be comparable, the test shall, as far as possible, be carried out after the same time interval after manufacture. ISO 471 shall be followed for time between sample manufacture and testing. Before testing, test pieces shall be conditioned for at
38、least 16 h at a standard laboratory temperature and humidity (see ISO 471); this 16 h period may be part of the 24 h interval after manufacture. 3.4 Test procedure 3.4.1 If required, apply the specified test pressure as given in the relevant product specification. 3.4.2 Measure and determine the ave
39、rage outside diameter D of the hose by means of a suitable measuring instrument as specified in ISO 4671. 3.4.3 Draw two parallel and diametrically opposed lines along the length of the hose. If the hose has natural curvature, one of the lines shall be on the outside of the curve. On each of these l
40、ines, mark a distance of 1,6C + 2D or 200 mm, whichever is the longer, where C is twice the minimum bend radius specified in the appropriate specification, so that the marked distances are exactly opposed. This will ensure a sufficient length for the bend test and adequate support of the hose. 3.4.4
41、 Separate guides A and B to a distance slightly less than 1,6C + 2D. Place the hose between the guides so that the ends of the marked distances are parallel to the ends of the guides and remain in this position while the guides are closed to a distance of C + 2D (see figure 1). 3.4.5 Check that the
42、hose on each side is supported to a length of not less than D. 3.4.6 Measure and determine the minimum outside dimension T in the curved portion of the hose (see figure 3). 4 Method B 4.1 Apparatus 4.1.1 Compression testing machine, with a rate of travel of the moving jaw of 100 mm/min, preferably p
43、rovided with a chart recorder. A scale, graduated in millimetre divisions, may be attached to the moving jaw to enable the bend diameter to be measured or, preferably, this may be determined from a graphical record. 4.1.2 Pair of twin channel-shaped holders, fitted with end stops for the hose test p
44、ieces (see figure 4). EN ISO 1746:2000 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 16:09:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI OSI )E(8991:6471 OSI 3 4.1.3 Thermostatically controlled environmental chamber, which can be fitted to the testing machine, with provision for access to e
45、nable the external diameter of the hose to be measured. 4.2 Test pieces 4.2.1 Types and dimensions The test shall be carried out on two pieces, of equal length, of the hose or tubing under test. The length of the test pieces depends on the dimensions of the test piece holders and shall be 2G + 0,5pC
46、, where G is is the length of the test piece holders (see figure 4) and C is twice the minimum bend radius specified in the appropriate specification. In no case shall the test pieces come into contact with the walls of the chamber and the length L shall always be less than the length of the enclosu
47、re. 4.2.2 Number Unless otherwise specified, three sets of tests shall be carried out. 4.3 Conditioning of test pieces No test shall be carried out within 24 h of manufacture. Fo evaluations which are intended to be comparable, the test shall, as far as possible, be carried out after the same time i
48、nterval after manufacture. ISO 471 shall be followed for time between sample manufacture and testing. Before testing, test pieces shall be conditioned in the straight condition or conforming to their natural curvature for 5 h in the environmental chamber (4.1.3) at the specified test temperature (se
49、e 4.4). 4.4 Test temperature The test temperature will be specified in the appropriate hose specification. 4.5 Test procedure 4.5.1 Measure the outside diameter D at the mid-point of the test pieces in the unstressed condition by means of a suitable measuring instrument as specified in ISO 4671. 4.5.2 Install the test pieces between the holders with a large bend radius and the ends of the test pieces against the end stops. The curvature shall follow the natural curvature, if any. 4.5.3 Start the machine and