1、BRITISH STANDARD BS 5173-103.2: 1990 Methods of test for Rubber and plastics hoses and hose assemblies Part 103: Physical tests Section 103.2 Determination of crush resistance of hosesBS5173-103.2:1990 This British Standard, having been prepared under the directionof the Rubber StandardsPolicy Commi
2、ttee, waspublished under the authorityof the Board of BSI andcomes into effect on 31 October 1990 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference RUM/9 Draft for comment 88/45285 DC ISBN 0 580 18328 9 Committees responsible for this British Standard
3、The preparation of this British Standard was entrusted by the Rubber Standards Policy Committee (RUM/-) to Technical Committee RUM/9, upon which the following bodies were represented: British Coal Corporation British Fluid Power Association British Gas Plc British Railways Board British Rubber Manuf
4、acturers Association Chief and Assistant Chief Fire Officers Association Energy Industries Council Engineering Equipment and Materials Users Association Ministry of Defence Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No. Date CommentsBS5173-103.2:1990
5、BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Test pieces 1 3 Conditioning of test pieces 1 4 Method A 1 5 Method B 1 6 Method C 2 7 Method D 2 8 Method E 3 9 Calculation and expression of results 3 10 Test report 3 Figure 1 Test piece and crushing pla
6、tes for methods A, B and E 1 Figure 2 Test piece and crushing plates for methods C and D 2 Publications referred to Inside front coverBS5173-103.2:1990 ii BSI 08-1999 Foreword This Section of BS 5173 has been prepared under the direction of the Rubber Standards Policy Committee. It is a revision of
7、clause 6 of BS 5173-3:1977, which is deleted by amendment. The remainder of the 1977 edition is to be revised and as each of the tests is revised it is intended to issue it as a separate Part or Section of BS 5173, as described in BS 5173-100. The major technical change is the addition of three extr
8、a methods. Methods C and D determine the same parameters as described in methods A and B but are carried out on a complete section of hose and are suitable for large bore hoses. Method E is a means of assessing the loss of function on crushing and is suitable for hoses for liquid petroleum gas (LPG)
9、/air installations. 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
10、 document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5173-1
11、03.2:1990 BSI 08-1999 1 1 Scope This Section of BS 5173 describes five methods for the determination of the behaviour of rubber and plastics hoses when subjected to a crushing force. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Test pieces 2.
12、1 For methods A, B, C and D, for hoses of nominal bore up to and including 50 mm, the test piece shall be a sample of hose of minimum length equal to four times the nominal bore. For hoses of nominal bore above 50mm and up to and including 100mm a length of 200mm shall be used. For hoses of nominal
13、bore greater than 100 mm the minimum length shall be twice the outside diameter. 2.2 For method E the test piece shall be a sample of hose long enough to connect to the air supply control valve and the air measuring equipment. 3 Conditioning of test pieces No test shall be carried out within 24 h of
14、 manufacture. NOTEFor evaluations which are intended to be comparable, the test should be carried out at the same time interval after manufacture. Before testing, test pieces shall be conditioned for at least16h at a standard temperature and humidity (see BS 903-A35); this16h period may be part of t
15、he24h interval after manufacture. 4 Method A 4.1 Principle The crush resistance of hoses is determined by measuring any residual deformation after releasing an applied specific force. 4.2 Apparatus 4.2.1 A compression testing machine, complying with BS 1610, or similar, capable of a rate of traverse
16、 of50 5 mm/min with a load capacity adequate for the level of crushing force that may be specified. 4.2.2 Two square metal plates, of sufficient thickness to be capable of withstanding the applied forces without deformation. The size of these plates may be chosen from the following depending on the
17、size and type of hose under test. 50 mm 50 mm 80 mm 80 mm 150 mm 150 mm 300 mm 300 mm The edges of the plates shall be rounded to an approximate radius of 1.5mm to avoid cutting of the hose during the test. 4.3 Procedure Condition the test piece (see 2.1) as described in clause 3. Measure the outsid
18、e diameter of the test piece (D 0 ) by an appropriate method described in BS5173-101.1 (see Figure 1). Place the test piece between the two parallel plates mounted in the test machine so that the central section of the test piece is crushed. Apply the specified crushing force for the hose under test
19、 at a rate of 50 5 mm/min and maintain for60 2 s. Measure the mean distance (D 1 ) between the face of the plates whilst the force is maintained. Release the force and remove the test piece from the machine. After 60 2 s measure the minimum outside dimension (D 2 ) of the test piece at the centre of
20、 the compressed area. 5 Method B 5.1 Principle The force required to achieve a specified deformation is determined and any residual deformation after the force has been released is measured. 5.2 Apparatus 5.2.1 A compression testing machine, as described in4.2.1. 5.2.2 Two square metal plates, as de
21、scribed in4.2.2. Figure 1 Test piece and crushing plates for methods A, B and EBS5173-103.2:1990 2 BSI 08-1999 5.3 Procedure Condition the test piece (see 2.1) as described in clause 3. Measure the outside diameter of the test piece (D 0 ) by an appropriate method described in BS 5173-101.1 (see Fig
22、ure 1). Place the test piece between the two parallel plates mounted in the test machine so that the central section of the test piece is crushed. Apply the crushing force at a rate of50 5 mm/min until the mean distance between the faces of the plates is the predetermined specified dimension for the
23、 hose under test. Measure the force applied and maintain the deformation for60 2 s. Release the force and remove the test piece from the machine. After 60 2 s measure the minimum outside dimension (D 2 ) of the test piece at the centre of the compressed area. 6 Method C 6.1 Principle Method C determ
24、ines the parameter described in method A, but is carried out on a complete section of hose. 6.2 Apparatus 6.2.1 A compression testing machine, as described in 4.2.1. 6.2.2 Two square metal plates, as described in 4.2.2, but of greater size than the test piece. 6.3 Procedure Condition the test piece
25、(see 2.1) as described in clause 3. Measure the outside diameter of the test piece (D 0 ) by an appropriate method described in BS 5173-101.1 (see Figure 2). Place the test piece between the two parallel plates mounted in the test machine so that the complete test piece is crushed. Apply the specifi
26、ed crushing force for the hose under test at a rate of 50 5 mm/min and maintain for60 2 s. Measure the mean distance (D 1 ) between the faces of the plates whilst the force is maintained. Release the force and remove the test piece from the machine. After 60 2 s measure the minimum outside dimension
27、 (D 2 ) of the test piece at the centre of the compressed area. 7 Method D 7.1 Principle Method D determines the parameter described in method B, but is carried out on a complete section of hose. 7.2 Apparatus 7.2.1 A compression testing machine, as described in4.2.1. 7.2.2 Two square metal plates,
28、as described in 4.2.2, but of greater size than the test piece. 7.3 Procedure Condition the test piece (see 2.1) as described in clause 3. Measure the outside diameter of the test piece (D 0 ) by an appropriate method described in BS 5173-101.1 (see Figure 2). Place the test piece between the two pa
29、rallel plates mounted in the test machine so that the complete test piece is crushed. Apply the crushing force at a rate of50 5 mm/min until the mean distance between the faces of the plates is the predetermined specified dimension for the hose under test. Measure the force applied and maintain the
30、deformation for 60 2 s. Release the force and remove the test piece from the machine. After 60 2 s measure the minimum outside dimension (D 2 ) of the test piece at the centre of the compressed area. Figure 2 Test piece and crushing plates for methods C and DBS5173-103.2:1990 BSI 08-1999 3 8 Method
31、E 8.1 Principle The crush resistance of hoses is determined by measuring the loss of function assessed by measuring the reduction in air flow through them whilst applying a specific force. 8.2 Apparatus 8.2.1 A compression testing machine, as described in4.2.1. 8.2.2 Two square metal plates, 25 mm 2
32、5 mm, and of sufficient thickness to avoid deformation. 8.2.3 A compressed air supply, capable of being maintained at a constant pressure of27.5 0.5 mbar 1) . 8.2.4 A variable flow control valve. 8.3 Procedure Condition the test piece (see 2.1) as described in clause 3. Measure the outside diameter
33、of the test piece (D 0 ) at the point where the crushing force is to be applied, by an appropriate method described in BS5173-101.1 (see Figure 1). Connect the inlet end of the hose to the compressed air supply maintained at a constant pressure of27.5 0.5 mbar. Fit the variable flow control valve at
34、 the outlet end and adjust it to give an airflow of0.28 0.01 m 3 /h. Place the central section of the hose between the two parallel plates mounted in the compression testing machine. Apply the specified crushing force evenly over a length of25mm of the hose, maintain for 30 2 s and measure the airfl
35、ow. Release the force and remove the test piece from the machine. After 60 2 s measure the minimum outside dimension (D 2 ) of the test piece at the point where the crushing force had been applied. 9 Calculation and expression of results 9.1 Percentage deformation Calculate the percentage deformatio
36、n under the specified force using the following expression: where 9.2 Percentage recovery Calculate the percentage recovery after removal of the specified force using the following expression: where 9.3 Force required for specified deformation Record the force required to maintain the specified dist
37、ance between the plates. 10 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 reinforcement; d) the number and date of this British St
38、andard, i.e. BS 5173-103.2:1990; e) the test method used; f) the crushing force applied; g) the results obtained, including D 0 , D 1 , D 2 , for methods A and C, and including D 0 , D 1 , D 2 , the distance between the plates and the force, for methods B and D; h) for method E, D 0and the airflow r
39、ate recorded during the time the hose is under the crushing force. 1) 1 mbar = 100 N/m 2= 100 Pa. D 0 is the original outside diameter (in mm); D 1 is the distance between the plates (in mm) under the specified force. % deformation D 1 D 0 - 100 = D 0 is the original outside diameter (in mm); D 2 is
40、 the outside diameter after removing force (in mm). % recovery D 2 D 0 - 100 =4 blankBS5173-103.2:1990 BSI 08-1999 Publications referred to BS 903, Methods of testing vulcanized rubber. BS 903-A35, Temperatures, humidities and times for conditioning and testing of test pieces. BS 1610, Materials tes
41、ting machines and force verification equipment. BS 5173, Methods of test for rubber and plastics hoses and hose assemblies. BS 5173-100, General introduction 2) . BS 5173-101.1, Measurement of dimensions (excluding length). 2) Referred to in the foreword only.BS 5173-103.2: 1990 BSI 389 Chiswick Hig
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