1、BRITISH STANDARD BS 5173-103.7: 1991 Methods of test for Rubber and plastics hoses and hose assemblies Part 103: Physical tests Section 103.7 Determination of fracture resistance of rigid polymer helical reinforcement in thermoplastics hosesBS5173-103.7:1991 This British Standard, having been prepar
2、ed under the directionof the Plastics and Rubber Standards Policy Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 31January1991 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PRM/66 Draft for comment 90/35198 DC
3、ISBN 0 580 19211 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/66, upon which the following bodies were represented: Association of Metropolitan Author
4、ities British Coal Corporation British Compressed Gases Association British Gas plc British Rubber Manufacturers Association Chief and Assistant Chief Fire Officers Association Energy Industries Council Fire Extinguishing Trades Association Home Office Institution of Fire Engineers Liquefied Petrole
5、um Gas Industry Technical Association (UK) London Fire and Civil Defence Authority London Regional Transport Malaysian Rubber Producers Research Association Ministry of Defence Society of Motor Manufacturers and Traders Limited The following bodies were also represented in the drafting of the standa
6、rd through subcommittees and panels: British Fluid Power Association Engineering Equipment and Materials Users Association Amendments issued since publication Amd. No. Date CommentsBS5173-103.7:1991 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Apparat
7、us 1 3 Test pieces 1 4 Conditioning of test pieces 1 5 Procedure 1 6 Test report 1 Figure 1 Diagrammatic representation of reinforcement fracture test 2 Table 1 Block sizes for the fracture test 1 Publication(s) referred to Inside back coverBS5173-103.7:1991 ii BSI 07-1999 Foreword This Section of B
8、S5173 has been prepared under the direction of the Plastics and Rubber Standards Policy Committee. This Section supersedes clause10 of BS5173-3:1977 and completes the revision of BS5173-3:1977 which is withdrawn. The remainder of the 1976 and 1977 editions are to be revised and as each of the tests
9、is revised it is intended to issue it as a separate Part or Section of BS5173, as described in BS5173-100. 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 St
10、andard 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, pages1and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpor
11、ated. This will be indicated in the amendment table on theinside front cover.BS5173-103.7:1991 BSI 07-1999 1 1 Scope This Section of BS5173 describes a method of test for the determination of the fracture resistance of the rigid polymer helical reinforcement in thermoplastics hoses. NOTEThe titles o
12、f the publications referred to in this standard are listed on the inside back cover. 2 Apparatus The apparatus consists of rectangular section lengths of hardwood or metal, having the specified block widths, appropriate to the bore size of the hose under test (seeTable 1). Table 1 Block sizes for th
13、e fracture test 3 Test pieces Each test piece shall be a ring of hose containing three helices of polymer reinforcement. This shall be split with a clean cut along its length. 4 Conditioning of test pieces No test shall be carried out within24h of manufacture. Test pieces shall be conditioned at sta
14、ndard laboratory temperature (23 2 C) for at least3h before testing. NOTEThe3h may be part of the 24h period. 5 Procedure Open up the test piece and place it over the block appropriate to its nominal bore. Leave it in this position seeFigure 1(a) for3362h. Reverse bend the test piece until the outer
15、 surfaces touch seeFigure 1(b) and examine for cracking or failure of the helices. 6 Test report The test report shall include the following information: a) the hose type and nominal bore; b) the date of manufacture and batch number or reference, if known; c) the method of manufacture and details of
16、 reinforcement; d) the number and date of this British Standard, i.e.BS5173-103.7:1991; e) the block width used; f) the period of test; g) whether or not fracture of the helices occurred and if so, the position and mode of failure for each test piece; h) the date of test. Nominal bore Block width 0.
17、2 mm mm mm 12.5 10 16 12 20 16 25 19 31.5 23 (38) 26 40 27 50 31 63 34 (75) 37 80 38 (88) 40 100 44 (112) 46 125 49 (127) 49 (137) 50 (153) 52 160 53 200 59 (203) 59 250 66 (305) 71 315 75 NOTENominal bores in parentheses are not preferred values.BS5173-103.7:1991 2 BSI 07-1999 Figure 1 Diagrammatic
18、 representation of reinforcement fracture testBS5173-103.7:1991 BSI 07-1999 Publication(s) referred to BS 5173, Methods of test for rubber and plastics hoses and hose assemblies 1) . BS 5173-100, General introduction. 1) Referred to in the foreword only.BS 5173-103.7: 1991 BSI 389 Chiswick High Road
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