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1、INTERNATIONAL STANDARD ISO 3949 Third edition 2004-12-01 Reference number ISO 3949:2004(E) ISO 2004 Plastics hoses and hose assemblies Textile-reinforced types for hydraulic applications Specification Tuyaux et flexibles en plastique Types hydrauliques avec armature textile Spcifications ISO 3949:20
2、04(E) ii ISO 2004 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing t
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5、iat at the address given below. ISO 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the addres
6、s below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 3949:2004(E) ISO 2004 All rights reserved iii Contents Page 1Scope 1 2
7、Normative references 1 3Terms and definitions 1 4Classification . 2 5Materials and construction . 2 5.1Hoses 2 5.2Hose assemblies . 2 6Dimensions and tolerances 2 6.1Diameters . 2 6.2Concentricity . 3 7Performance requirements . 3 7.1Hydrostatic requirements . 3 7.2Change in length . 3 7.3Minimum be
8、nd radius . 3 7.4Resistance to impulse 4 7.5Leakage of hose assemblies 4 7.6Cold flexibility 4 7.7Ozone resistance . 4 7.8Electrical conductivity 4 7.9Resistance to fluids 5 8Frequency of testing . 5 9Designation 5 10Marking . 6 10.1Hoses 6 10.2Hose assemblies . 6 11Recommendations for packaging and
9、 storage . 6 12Test report 6 Annex A (normative) Frequency of testing for type approval and routine tests 7 Annex B (informative) Recommended frequency of testing for production acceptance tests . 8 Annex C (informative) Recommendations for lengths of supplied hoses and hose assemblies . 9 Annex D (
10、normative) Method of test for electrical conductivity 10 Bibliography . 11 -,-,- ISO 3949:2004(E) iv ISO 2004 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Intern
11、ational Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with
12、 ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical
13、 committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to
14、the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3949 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Hoses (rubber and pl
15、astics). This third edition cancels and replaces the second edition (ISO 3949:1991), which has been technically revised. INTERNATIONAL STANDARDISO 3949:2004(E) ISO 2004 All rights reserved 1 Plastics hoses and hose assemblies Textile-reinforced types for hydraulic applications Specification 1Scope T
16、his International Standard specifies requirements for two types of textile-reinforced thermoplastics hoses and hose assemblies of nominal bore from 5 to 25. Each type is divided into two classes dependent on electrical- conductivity requirements. They are suitable for use with: hydraulic fluids HH,
17、HL, HM, HR and HV (as defined in ISO 6743-4) at temperatures ranging from to ; water-based hydraulic fluids HFC, HFAE, HFAS and HFB (as defined in ISO 6743-4) at temperatures ranging from to . This International Standard does not include requirements for end fittings. It is limited to the performanc
18、e of hoses and hose assemblies. NOTEOperating temperatures in excess of may materially reduce the life of the hose. 2Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated refer
19、ences, the latest edition of the referenced document (including any amendments) applies. ISO 1402, Rubber and plastics hoses and hose assemblies Hydrostatic testing ISO 1817, Rubber, vulcanized Determination of the effect of liquids ISO 4671, Rubber and plastics hoses and hose assemblies Methods of
20、measurement of dimensions ISO 4672:1997, Rubber and plastics hoses Sub-ambient temperature flexibility tests ISO 6803, Rubber or plastics hoses and hose assemblies Hydraulic-pressure impulse test without flexing ISO 7326:1991, Rubber and plastics hoses Assessment of ozone resistance under static con
21、ditions ISO 8330, Rubber and plastics hoses and hose assemblies Vocabulary ISO 8331, Rubber and plastics hoses and hose assemblies Guide to selection, storage, use and maintenance 3Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8830 apply. 40 C +100 C
22、 0 C +60 C 100 C ISO 3949:2004(E) 2 ISO 2004 All rights reserved 4Classification Two types of hose are specified, distinguished by their maximum working pressure: a)type R7: hoses with one or more layers of reinforcement; b)type R8: hoses with one or more layers of reinforcement, for operation at hi
23、gher working pressures. Each type of hose is divided into two classes according to its electrical properties: 1)class 1, no electrical requirements; 2)class 2, “non-conductive” (see 7.8). 5Materials and construction 5.1Hoses Hoses shall consist of a seamless thermoplastics lining resistant to hydrau
24、lic fluids, with a suitable textile yarn reinforcement and a thermoplastics cover resistant to hydraulic fluids, water and the weather. For class 2 hoses, the cover shall not be perforated. It shall be orange (colour code RAL 2004). 5.2Hose assemblies Hose assemblies shall only be manufactured with
25、those hose fittings whose functionality conforms to the requirements of 7.1, 7.4, 7.5, 7.6 and, for class 2 only, 7.8. NOTEThe manufacturers instructions should be followed for proper preparation and fabrication of hose assemblies. 6Dimensions and tolerances 6.1Diameters When measured in accordance
26、with ISO 4671, the diameters of hoses shall conform to the values given in Table 1. Table 1 Dimensions of hoses Nominal bore Inside diameter Maximum outside diameter Type R7Type R8Type R7Type R8 54,65,44,65,411,414,6 6,36,27,06,27,013,716,8 87,78,57,78,515,618,6 109,310,39,310,318,420,3 12,512,313,5
27、12,313,522,524,6 1615,616,715,616,725,829,8 1918,619,818,619,828,633,0 2525,026,425,026,434,738,6 NOTEInside diameters are in accordance with ISO 4397. mmmm min.max.min.max. -,-,- ISO 3949:2004(E) ISO 2004 All rights reserved 3 6.2Concentricity When measured in accordance with ISO 4671, the concentr
28、icity of hoses shall conform to the values given in Table 2. 7Performance requirements 7.1Hydrostatic requirements When determined in accordance with ISO 1402, the maximum working pressure, the proof pressure and the minimum burst pressure of hoses and hose assemblies shall conform to the values giv
29、en in Table 3. 7.2Change in length When determined in accordance with ISO 1402, the change in length of the hose at the maximum working pressure shall not exceed . 7.3Minimum bend radius Use test pieces having a length at least four times the minimum bend radius. Measure the hose outside diameter wi
30、th vernier callipers in the straight lay position before bending the hose. Bend the hose through to the minimum bend radius and measure the flatness with the callipers. Table 2 Concentricity of hoses Nominal bore Maximum variation in wall thickness between inside diameter and outside diameter Up to
31、and including 6,30,8 Over 6,3 and including 191,0 Over 191,3 Table 3 Maximum working pressure, proof pressure and minimum burst pressure Nominal bore Maximum working pressure Proof pressureMinimum burst pressure barabarabara Type R7Type R8Type R7Type R8Type R7Type R8 52103504207008401 400 6,31923503
32、857007701 400 8175350700 101582803155606301 120 12,5140245280490560980 16105192210385420770 1988158175315350630 2570140140280280560 a . mm 1 bar=0,1 MPa 3 % 180 -,-,- ISO 3949:2004(E) 4 ISO 2004 All rights reserved When bent to the minimum bend radius given in Table 4, measured on the inside of the
33、bend, the flatness shall not exceed of the original outside diameter. 7.4Resistance to impulse 7.4.1The impulse test shall be in accordance with ISO 6803. The test-fluid temperature shall be . 7.4.2For type R7 hoses, when tested at an impulse pressure equal to of the maximum working pressure, the ho
34、se shall withstand a minimum of 150 000 impulse cycles. For type R8 hoses, when tested at an impulse pressure equal to of the maximum working pressure, the hose shall withstand a minimum of 200 000 impulse cycles. 7.4.3There shall be no leakage or other malfunction before reaching the specified numb
35、er of cycles. 7.4.4This test shall be considered a destructive test and the test pieces shall be destroyed after the test. 7.5Leakage of hose assemblies When tested in accordance with ISO 1402, there shall be no leakage or evidence of failure. This test shall be considered a destructive test and the
36、 test piece shall be destroyed after the test. 7.6Cold flexibility When tested in accordance with method B of ISO 4672:1997 at a temperature of , there shall be no cracking of the lining or cover. The test piece shall not leak or crack when subjected to a proof-pressure test in accordance with ISO 1
37、402 after regaining ambient temperature. 7.7Ozone resistance When tested in accordance with method 1 or 2, depending on the nominal bore of the hose, of ISO 7326:1991, no cracking or deterioration of the cover shall be visible under magnification. 7.8Electrical conductivity This test shall be carrie
38、d out in accordance with Annex D. It applies to class 2 hoses only (the test shall not be applied to hoses with a perforated cover). The current measured during the test shall be no greater than . Table 4 Minimum bend radius Nominal bore Minimum bend radius 590 6,3100 8115 10125 12,5180 16205 19240
39、25300 10 % mm 100 C 125 % 133 % 40 C 2 50A -,-,- ISO 3949:2004(E) ISO 2004 All rights reserved 5 7.9Resistance to fluids 7.9.1Test pieces The fluid resistance tests specified in 7.9.2 to 7.9.4 shall be carried out on moulded sheets of lining and cover material having a minimum thickness of . 7.9.2Oi
40、l resistance When determined in accordance with ISO 1817 by immersion in IRM 903 oil for at a temperature of , the percentage change in volume of the lining and cover shall be between and . 7.9.3Water based fluid resistance When determined in accordance with ISO 1817 by immersion in a test liquid ma
41、de up of equal volumes of 1,2-ethanediol and distilled water for at a temperature of , the percentage change in volume of the lining and cover shall be between and . 7.9.4Water resistance When determined in accordance with ISO 1817 by immersion in distilled water for at a temperature of , the percen
42、tage change in volume of the lining and cover shall not be greater than . 8Frequency of testing The frequency of type approval and routine testing shall be as specified in Annex A. Type approval tests are those tests required to confirm that a particular hose design, manufactured by a particular met
43、hod, meets all the requirements of this International Standard. The tests shall be repeated at a maximum of five-year intervals, or whenever a change in the method of manufacture or materials used occurs. They shall be performed on the largest-diameter hose of each design and each type in the manufa
44、cturers range. Routine tests are those tests required to be carried out on each length of finished hose prior to dispatch. Production acceptance tests are those tests, specified in Annex B, which should preferably be carried out to control the quality of manufacture. The frequencies specified in Ann
45、ex B are given as a guide only. 9Designation Hoses shall be designated as in the following example for a type R7 textile-reinforced thermoplastics hydraulic hose of class 1 with a nominal bore of 10. EXAMPLEISO 3949/R7-1/10. 2 mm 72 0 2h 100 C 3 C 0 %+35 % 168 0 2h 70 C 1 C 0 %25 % 168 0 2h 70 C 1 C
46、 25 % ISO 3949:2004(E) 6 ISO 2004 All rights reserved 10Marking 10.1Hoses Hoses shall be marked with at least the following information, and the marking shall be repeated at least once every : a)the manufacturers name or identification, e.g. Man; b)the number of this International Standard, i.e. ISO
47、 3949; c)the type and class, e.g. R7-1; d)for class 2 hoses, the words “NON-CONDUCTIVE”; e)the nominal bore, e.g. 16; f)the quarter and last two digits of the year of manufacture, e.g. 3Q04. EXAMPLE 1Man/ISO 3949/R7-1/16/3Q04. EXAMPLE 2Man/ISO 3949/R7-2 NON-CONDUCTIVE/16/3Q04. 10.2Hose assemblies Ho
48、se assemblies shall be marked with at least the following information: a)the manufacturers name or identification, e.g. Man; b)the maximum working pressure1) of the assembly, in bars2), e.g. 70; c)the last two digits of the month and year of assembly, e.g. 09/04. EXAMPLEMan/70/09/04. 11Recommendations for packaging and storage These are given in ISO 8331. 12Test report When requested by the purchaser, the manufacturer or supplier shall provide a test report with each length or batch of hoses supplied to the purchaser. 1)The maximum working pressure of an assembly is the lowest maximum wor