1、BRITISH STANDARD BS EN ISO 7662:1996 Rubber and plastics hoses Determination of abrasion of lining The European Standard EN ISO 7662:1996 has the status of a British Standard ICS 23.040.70BS EN ISO 7662:1996 This British Standard, having been prepared under the direction of the Sector Board for Mate
2、rials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 December 1996 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference PRI/66 Draft for comment 91/43041 DC ISBN 0 580 26605 2 Committees responsible for
3、 this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/66, Rubber and plastics tubing, hoses and hose assemblies, upon which the following bodies were represented: Association of Metropolitan Authorities British Coal Corporation British Compressed Ga
4、ses Association British Rubber Manufacturers Association Ltd. Chief and Assistant Chief Fire Officers Association Energy Industries Council Fire Extinguishing Trades Association Home Office London Fire and Civil Defence Authority Ministry of Defence RAPRA Technology Ltd. Society of Motor Manufacture
5、rs and Traders Limited The following body was also represented in the drafting of the standard, through subcommittees and panels: British Fluid Power Association Amendments issued since publication Amd. No. Date CommentsBS EN ISO 7662:1996 BSI 11-1998 i Contents Page Committees responsible Inside fr
6、ont cover National foreword ii Foreword 2 1 Scope 3 2 Apparatus 3 3 Grit 3 4 Test piece 3 5 Procedure 3 6 Expression of results 3 7 Test report 3 Figure 1 Basic principle of blasting cabinet with test piece inserted 4 Figure 2 Typical ejector system 5 Figure 3 Position of the test piece during the t
7、est 5BS EN ISO 7662:1996 ii BSI 11-1998 National foreword This British Standard has been prepared by Technical Committee PRI/66 and is the English language version of EN ISO 7662:1996 Rubber and plastics hoses Determination of abrasion of lining, published by the European Committee for Standardizati
8、on (CEN). It is identical with ISO 7662:1988 published by the International Organization for Standardization (ISO). EN ISO 7662:1996 was produced as a result of international discussions in which the United Kingdom took an active part. EN ISO 7662:1966 has been approved by CEN member bodies under th
9、e weighted voting procedures introduced in 1988 to coincide with the introduction of the “New Approach” Directives from the Commission of the European Community. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for
10、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, pages i and ii, theEN title page, pages 2 to 5 and a back cover. This standard has been updated (see
11、 copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7662 July 1996 ICS 23.040.70 Descriptors: See ISO document English version Rubber and plastics hoses Determinatio
12、n of abrasion of lining (ISO 7662:1988) Tuyaux en caoutchouc et en plastique Dtermination de labrasion du tube du tuyau (ISO 7662:1988) Gummi- und Kunststoffschluche Bestimmung des Abriebs der Innenschicht (ISO 7662:1988) This European Standard was approved by CEN on 1995-12-15. CEN members are boun
13、d 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 Ce
14、ntral 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 a
15、s 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. CEN European Committee for Standardization Comit E
16、uropen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN ISO 7662:1996 EEN ISO 7662:1996 BSI 11-1998 2 Foreword The text of the International Standard from Technical Committee ISO/TC 45, Rubber
17、and rubber products, of the International Organization for Standardization (ISO) has been taken over as a 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 Standard shall be given the status of a
18、 national standard, either by publication of an identical text or by endorsement, at the latest by January 1997, and conflicting national standards shall be withdrawn at the latest by January 1997. According to CEN/CENELEC Internal Regulations, the national standards organizations of the following c
19、ountries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.EN ISO 7662:1996 BSI 11-1998 3 1 Scope This International Standar
20、d specifies a method for determining the abrasion of a hose lining when a certain amount of specified grit is passed through the hose. The method is applicable to rubber and plastics hoses with an internal bore of 20 to 50 mm used for grit blasting, shot blasting and similar operations. The method m
21、ay be used for comparison of the abrasion resistance of different types of hose, but not for specification of maximum abrasion in a hose standard. Comparison should be made on the same type and size of hose. Results from tests carried out with different types of grit should not be compared. 2 Appara
22、tus 2.1 Grit blasting cabinet, constructed according to the basic principles shown in Figure 1. The cabinet shall contain 25 kg of grit which is continually circulated during the test. The dimensions of the feed hose and air inlet of the grit container shall allow a grit flow rate of 42 g/s 2 g/s. 2
23、.2 Ejector, with a blasting nozzle manufactured from hard metal, having an internal diameter of 10 mm 1 mm, the length of the cylindrical part being between 50 and 100 mm. A typical arrangement is shown in Figure 2. 2.3 Filter, for drying the compressed air. 2.4 Pressure regulator, capable of contro
24、lling the air pressure. 2.5 Fixture, for mounting the hose in the specified position and for obtaining parallelism between the nozzle and the hose. 3 Grit The grit used shall be a cast iron grit with a particle size of 0,7 to 0,9 mm and a Rockwell hardness of 58 to 60 HRC. Other types of grit may be
25、 used if a description is given in the test report. 4 Test piece The test piece shall consist of a piece of hose with a length of 1 000 mm 50 mm. 5 Procedure 5.1 Weigh the test piece (clause 4) to the nearest0,1g. 5.2 Check the flow rate of the grit (clause 3), which shall be 42 g/s 2 g/s at an air
26、pressure of 250 kPa, by collecting and weighing the amount of grit passing in a given period. 5.3 Mount the test piece in the vertical position in the cabinet (2.1), using the fixture (2.5) to obtain the correct position in accordance with Figure 3. The bend radius r shall be six times the nominal b
27、ore size of the hose. 5.4 Connect the blasting nozzle to the test piece and check that the centreline of the nozzle and that of the test piece do not deviate more than 1. The nozzle shall be inserted in the test piece for a length of 25 to 50 mm. 5.5 Fill the grit container in the cabinet with 25 kg
28、 of new, not previously used, grit. 5.6 Set the air pressure at 250 kPa 25 kPa (see2.4). 5.7 Start the blasting and continue for400min 1min. 5.8 Remove the test piece from the cabinet and clear it of residual grit by blowing air through the hose bore and brushing the cover of the hose. 5.9 Weigh the
29、 test piece to the nearest 0,1 g. 6 Expression of results Determine the loss in volume, DV, in cubic centimetres, using the formula where 7 Test report The test report shall include the following information: a) a full description of the hose tested, including the density of the lining material; b)
30、a reference to this International Standard; c) details of test conditions: type of grit, flow rate of grit, test time; d) the loss of volume, given in cubic centimetres; e) any other observation made during the test; f) the date of the test. m 1 is the mass, in grams, of the test piece before testin
31、g (5.1); m 2 is the mass, in grams, of the test piece after testing (5.9); is the density, in grams per cubic centimetre, of the lining material. m 1 m 2 -EN ISO 7662:1996 4 BSI 11-1998 Figure 1 Basic principle of blasting cabinet with test piece inserted (A suitable cabinet can measure about 1 m 1
32、m 1 m.)EN ISO 7662:1996 BSI 11-1998 5 Figure 2 Typical ejector system Figure 3 Position of the test piece during the test (The two shanks of the hose shall have the same length.)BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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