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1、BRITISH STANDARD BS EN ISO 1402:1997 Rubber and plastics hoses and hose assemblies Hydrostatic testing The European Standard EN ISO 1402:1996 has the status of a British Standard ICS 23.040.70 BS EN ISO 1402:1997 This British Standard, having been prepared under the direction of the Sector Board for
2、 Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 10-1998 The following BSI references relate to the work on this standard: Committee reference PRI/66/4 Draft for comment 91/48181 DC ISBN 0 580 26910 8 Committees responsib
3、le for this British Standard The preparation of this British Standard was entrusted by Technical Committee PRI/66, Rubber and plastics tubing, hoses and hose assemblies, to Subcommittee PRI/66/4, Methods of test, upon which the following bodies were represented: British Fluid Power Association Briti
4、sh Rubber Manufacturers Association Ltd. Energy Industries Council Ministry of Defence Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.DateComments BS EN ISO 1402:1997 BSI 10-1998i Contents Page Committees responsible Inside front cover National forewor
5、d ii Foreword2 1Scope3 2Normative references3 3General3 4Apparatus3 5Test pieces3 6Application of hydrostatic pressure3 7Hydrostatic pressure tests4 8Test report5 Annex ZA (normative) Normative references to international publications with their relevant European publications7 Figure 1 Measurements
6、of dimensional stability6 Figure 2 Measurements of amount of twisting6 List of referencesInside back cover BS EN ISO 1402:1997 ii BSI 10-1998 National foreword This British Standard has been prepared by Subcommmittee PRI/66/4 and is the English language version of EN ISO 1402:1996 Rubber and plastic
7、s hoses and hose assemblies Hydrostatic testing published by the European Committee for Standardization (CEN). It is identical with ISO 1402:1994 published by the International Organization for Standardization (ISO). ISO 1402 was produced as a result of international discussions in which the United
8、Kingdom took an active part. It supersedes BS 5173-102.1:1991 which is withdrawn. EN ISO 1402:1996 has been approved by CEN member bodies under the weighted voting procedures introduced in 1988 to coincide with the introduction of “New Approach” Directives from the Commission of the European Communi
9、ty. Cross-references Publication referred toCorresponding British Standard ISO 471:19841)BS 903 Physical testing of rubber Part A35:1995 Temperatures, humidities and times for conditioning and testing of test pieces EN 24671:1993BS EN 24671:1993 Rubber and plastics hose and hose (ISO 4671:1984) asse
10、mblies. Methods of measurement of dimensions ISO 7751:1991BS 6596:1992 Specification for ratios of proof and burst pressure to design working pressure for rubber and plastics hoses and hose assemblies A British Standard does not purport to include all the necessary provisions of a contract. Users of
11、 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, pages i and ii, the EN title page, pages 2 to 8, an inside ba
12、ck 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. 1) This standard has been superseded by ISO 471:1995 with which the British Standard cited is identical. E
13、UROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1402 August 1996 ICS 23.040.70 Descriptors: Rubber products, plastics products, rubber hoses, plastics hoses, tests, hydrostatic tests, determination, dimensional stability English version Rubber and plastics hoses and hose assemblies Hydrostat
14、ic testing (ISO 1402:1994) Tuyaux et flexibles en caoutchouc et en plastique Essais hydrostatiques (ISO 1402:1994) Gummi- und Kunststoffschluche und -Schlauchleitungen Hydrostatische Prfung (ISO 1402:1994) This European Standard was approved by CEN on 1996-02-26. CEN members are bound to comply with
15、 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 Central Secretaria
16、t 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 as the official v
17、ersions. 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 Europen de Normal
18、isation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN ISO 1402:1996 E EN ISO 1402:1996 2 BSI 10-1998 Foreword The text of the International Standard from Technical Committee ISO/TC 45, Rubber and rubber prod
19、ucts, 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 Standard shall be given the status of a national stan
20、dard, either by publication of an identical text or by endorsement, at the latest by February 1997, and conflicting national standards shall be withdrawn at the latest by February 1997. According to the CEN/CENELEC Internal Regulations, the National standards organizations of the following countries
21、 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. NOTENormative references to International Standards are listed in annex
22、ZA (normative) EN ISO 1402:1996 BSI 10-19983 1 Scope This International Standard specified methods for the hydrostatic testing of rubber and plastics hoses and hose assemblies, including methods for the determination of dimensional stability. 2 Normative references The following standards contain pr
23、ovisions 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 on this International Standard are encouraged to investigate the
24、 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 471:2), Rubber Times, temperatures and humidities for conditioning and testing. ISO 4671:1984, Rubber and plastics hose and ho
25、se assemblies Methods of measurement of dimensions. ISO 7751:1991, Rubber and plastics hoses and hose assemblies Ratios of proof and burst pressure to design working pressure. 3 General Unless otherwise specified, all tests shall be carried out at standard temperature (see ISO 471). 4 Apparatus 4.1
26、Pressure source, capable of applying pressure at the rate specified in 6.2.2, up to the required test pressure. 4.2 Calibrated pressure gauge or pressure transducers with digital readouts, chosen for each test so that the test pressure is between 15 % and 85 % of the full-scale reading. In the inter
27、est of accuracy, calibrated pressure gauges or pressure transducers with digital readouts shall be checked at frequent intervals and the fitting of restrictors is recommended to minimize shock damage. 4.3 Sliding vernier callipers or micrometer, and measuring tape. 5 Test pieces 5.1 Hose assemblies
28、When hose assemblies are to be tested, the manufactured assembly length shall be used for the test. 5.2 Hoses The hydrostatic pressure and burst tests shall be carried out on a hose test piece with a minimum free length, excluding end fittings and end reinforcements, of 600 mm when deformation is to
29、 be measured and 300 mm when it is not. 5.3 Number of test pieces At least two test pieces shall be tested. 6 Application of hydrostatic pressure 6.1 General Water or another liquid suitable for the hose under test shall be used as the test medium. WARNING Hoses and hose assemblies pressurized by li
30、quids can fail in a potentially dangerous manner. For this reason, the test shall be performed in a suitable enclosure. Also the use of air and other gases as test media shall be avoided because of the risk to operators. In special cases, where such media are required for the tests, strict safety me
31、asures are imperative. Furthermore, it is stressed that, even when a liquid is used as the test medium, it is essential that all air is expelled from the test piece because of the risk of injury to the operator due to the sudden expansion of trapped air released when the hose bursts. 6.2 Procedure 6
32、.2.1 Fill the test piece with test liquid, expelling all air, and connect to the test equipment. Close the valve and apply the hydrostatic pressure at a uniform rate of increase. Measure the pressure using a calibrated pressure gauge or pressure transducer with digital readout (4.2). NOTE 1It is imp
33、ortant to allow unrestricted movement of the free or plugged end of the test piece during the test. 6.2.2 The rate of pressure increase shall be constant and chosen to reach the final pressure after between 30 s and 60 s for hoses with nominal inside diameters up to 50 mm. For hoses with nominal ins
34、ide diameters greater than 50 mm and less than or equal to 250 mm, the time needed to reach the final pressure shall be between 60 s and 240 s. For hoses with nominal inside diameters larger than 250 mm, the time needed to reach the final pressure shall be decided between the manufacturer and user.
35、2) To be published. (Combination and revision of ISO 471:1983 and ISO 1826:1981) EN ISO 1402:1996 4 BSI 10-1998 7 Hydrostatic pressure tests 7.1 Proof pressure hold test When proof pressure tests are used to determine leakage of hoses or hose assemblies, apply the specified proof pressure in accorda
36、nce with 6.2.2 and hold it for not less than 30 s or more than 60 s, unless otherwise specified in the product standard, examining the test pieces during this period for evidence of leakage, cracking, abrupt distortions indicating irregularity in material or manufacture, or other signs of failure. U
37、nless otherwise specified for the hose, the proof pressure shall be related to the design working pressure by the ratio given in ISO 7751. NOTE 2The test is not applicable to curved hose. 7.2 Measurement of deformation under pressure 7.2.1 General procedure When tests for determining change in lengt
38、h, change in internal diameter and twisting are required, straighten the hose, lay it out horizontally for inspection and apply a hydrostatic pressure of 0,07 MPa when this is necessary to stabilize the hose. Make three reference marks (A, B and C) on the outer surface of the hose, the middle mark (
39、B) being made approximately midway along the length of the hose, and the two outer marks (A and C) being 250 mm from B. Each mark shall consist of an arc on the circumference of the hose through which is drawn a straight line perpendicular to the arc, the three straight lines being colinear (see Fig
40、ure 1). Maintain the initial pressure of 0,07 MPa (if applied) and make the appropriate measurements (see 7.2.2, 7.2.3 and 7.2.4) at the reference marks. Apply the specified test pressure at the rate specified in 6.2.2 and maintain it for 1 min before making the test measurements, which shall then b
41、e made as quickly as possible to avoid prolonging the test period. NOTE 3The test pressure will be specified in the appropriate hose product specification and could be the design working pressure, the proof pressure or any other pressure below the proof pressure at which the hose deformation charact
42、eristics are to be measured. 7.2.2 Change in length Measure the length between the two outermost reference marks (A and C) with an accuracy of 1 mm, using the measuring tape (4.3), at the initial pressure (0 or 0,07 MPa) and at the specified test pressure. Calculate the change in length, l, expresse
43、d as a percentage of the original length, from the equation where l0 is the distance between the two outermost reference marks (A and C) measured at the initial pressure; l1 is the distance between the same two reference marks measured at the specified test pressure. 7.2.3 Change in external diamete
44、r 7.2.3.1 General The external diameter should preferably be determined from measurements of circumference made with an accuracy of 1 mm using the measuring tape (see ISO 4671). The measurements may, however, be made directly, using sliding vernier callipers having a minimum useful tip width of 5 mm
45、. 7.2.3.2 Determination by measuring the change in external circumference Using the measuring tape (4.3), measure the circumference at each of the three reference marks (A, B and C) at the intial pressure (0 or 0,07 MPa) and at the specified test pressure. Calculate the change in diameter D, express
46、ed as a percentage of the original diameter, from the equation where C0 is the sum of the circumferences at the three reference marks measured at the initial pressure; C1 is the sum of the circumferences at the three reference marks measured at the specified test pressure. 7.2.3.3 Direct measurement
47、 of change in external diameter Using the sliding vernier callipers (4.3), measure two perpendicular diameters at each of the three reference marks at the initial pressure (0 or 0,07 MPa) and at the specified test pressure. Calculate the change in diameter D, expressed as a percentage of the origina
48、l diameter, from the equation where D0 is the sum of the six diameters measured at the reference marks at the initial pressure; l l1l0 l0 - -100= D C1C0 C0 - -100= D D1D0 D0 - -100= EN ISO 1402:1996 BSI 10-19985 D1is the sum of the six diameters measured at the reference marks at the specified test
49、pressure. 7.2.4 Twisting If twisting of the hose develops under pressure, the original lines forming the reference marks will take up a helical pattern (see Figure 2). With the hose at the specified test pressure, project a straight line along the length of the hose from reference mark A until it intersects, at C, the circular arc at reference point C. Then measure the length s of the circular arc CC to the nearest millimetre, using the measuring tape (4.3