1、BRITISH STANDARD BS5173-102.4: 1990 Methods of test for Rubber and plastics hoses and hose assemblies Part102: Hydraulic pressure tests Section102.4 Determination of volumetric expansion of hydraulic hosesBS5173-102.4:1990 This British Standard, having been prepared under the directionof the Rubber
2、StandardsPolicy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 30 November1990 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference RUM/9 Draft for comment89/40480 DC ISBN 0 580 18682 2 Committees responsible for th
3、is British Standard 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: Association of Metropolitan Authorities British Coal British Compressed Gases Association Britis
4、h 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 Petroleum Gas Industry Technical Association (UK) London Fire and Civil Defence A
5、uthority 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 standard, through subcommittees and panels: British Fluid Power Association Engi
6、neering Equipment and Materials Users Association Amendments issued since publication Amd. No. Date CommentsBS5173-102.4:1990 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Apparatus 1 3 Test pieces 1 4 Conditioning 1 5 Procedure 1 6 Expression of resul
7、ts 1 7 Test report 1 Figure 1 Schematic arrangement of test rig 2 Publication(s) referred to Inside back coverBS5173-102.4:1990 ii BSI 03-1999 Foreword This Section of BS5173, prepared under the direction of the Rubber Standards Policy Committee, is a revision of clause 6 of BS5173-2:1976. BS5173-2:
8、1976 is withdrawn. The remainder of the1976 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 BS5173, as described in BS5173-100. A British Standard does not purport to include all the necessary provisions of a contract. Users of
9、 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 document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, an inside back cover and a back co
10、ver. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS5173-102.4:1990 BSI 03-1999 1 1 Scope This Section of BS5173 describes a method of determination of the volumetric expansion of
11、hydraulic hoses. The basic principles are similar to those described in BS5173-102.2 but the test described in this Section is more appropriate to hydraulic hoses. It is a specialized test and should be carried out only at the specific request of the purchaser. NOTE 1This Section of BS5173 does not
12、specify the test pressure at which the test will be carried out. The test pressure will be specified in the appropriate hose product specification. NOTE 2The titles of the publications referred to in this standard are listed on the inside back page. 2 Apparatus 2.1 Test rig, as shown in Figure 1, co
13、mprising a suitable source of fluid together with a pressure gauge, piping, valves and fittings enabling a vertical length of hose to be subjected to hydraulic pressure. The fluid used shall be distilled water unless otherwise specified. The bore of all piping and connections shall be smooth without
14、 recesses or off-sets, so that all air may be freely removed from the system before carrying out each test. The valves shall be of such design as to open and close with minimum displacement of fluid. The apparatus shall be capable of increasing the pressure in the test piece at the following rate: a
15、) between0.075 MPa/s and0.175 MPa/s for test pressures of up to12.5 MPa; b) between0.35 MPa/s and1.0 MPa/s for higher test pressures. NOTEFor safety reasons the pressure rating of the test apparatus should be capable of withstanding the test pressure with a safety factor of3. 2.2 A measuring cylinde
16、r, of sufficient accuracy and capacity to measure the volume of fluid corresponding to the expansion of the hose under test. 3 Test pieces Three test assemblies with end fittings shall be tested. Each test assembly shall be a minimum of3m in length. NOTEThis length is selected to minimize the signif
17、icance of any change in volume caused by the end fittings. 4 Conditioning No test shall be carried out within24h of manufacture of test piece. Test pieces shall be conditioned at standard laboratory temperature as specified in BS903-A35 before testing, for atleast3h. NOTEThe3h may be part of the24h
18、after manufacture. 5 Procedure 5.1 Connect the test piece in position on the apparatus in such a way as to obtain a leak-proof seal taking care to avoid twisting the assembly. Maintain the test piece in a vertical position without being in tension while under pressure. Measure the free length of the
19、 exposed hose of the test piece in accordance with BS5173-101.2. 5.2 Fill the reservoir with fluid. Open valves A and B and pump fluid through the test specimen. Continue pumping until all air is expelled from the system. 5.3 Close valve B and increase the pressure in the test specimen to the specif
20、ied test pressure at the rate specified in 2.1. Close valve A to isolate the test specimen from the pressure source. Release fluid through valve B to reduce the pressure in a series of discrete steps down to atmospheric pressure. Select pressure stages less than or equal to10% of the specified test
21、pressure. Collect the fluid expelled at each stage of pressure reduction in the measuring cylinder. Allow a period of at least60s to elapse between each stage of pressure reduction. If necessary withdraw further fluid to maintain pressure at the selected value. Record the volume of fluid collected t
22、o the nearest0.01cm 3 . Carry out each test series three times over the full pressure range for each hose examined. 6 Expression of results For each hose assembly tested, the volumetric expansion per unit free length of test piece, E, (incm 3 /m) is given by the equation where V is the average volum
23、e of fluid collected from the three expansion tests (in cm 3 ); L is the free length of the test piece (inm). Report the result in cubic centimetres per metre to the nearest0.01 cm 3 /m. NOTEThe volumetric expansion may be expressed as a percentage of the original volume, if required, by determining
24、 the internal diameter and the free length of the hose assembly, and hence its volume, prior to testing. 7 Test report The test report shall include the following information: a) a reference to this method of test, i.e.BS5173-102.4; b) a full description of the hose and its origin; c) the dimensions
25、 of the test piece; E V L - =BS5173-102.4:1990 2 BSI 03-1999 d) the test pressure; e) the volume of the three expansions for each test piece; f) the calculated hose expansion (in cm 3 /m); g) the percentage volumetric expansion, if required. Figure 1 Schematic arrangement of test rigBS5173-102.4:199
26、0 BSI 03-1999 Publication(s) referred to BS903, Methods of testing vulcanized rubber. BS903-A35, Temperature, humidities and times for conditioning and testing of test pieces. BS5173, Methods of test for rubber and plastics hoses and hose assemblies. BS5173-100, General introduction 1) . BS5173-101.
27、2, Measurement of length of hoses and hose assemblies. BS5173-102.2, Determination of volumetric expansion. 1) Referred to in the foreword only.BS5173-102.4: 1990 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing Br
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