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1、INTERNATIONAL STANDARD ISO 11425 First edition 1996-04-15 Rubber hoses and hose assemblies for automobile power-steering Systems - Specification Tuyaux et flexibles en caoutchouc pour circuits de direction assistke - Sp Pressure rise time: 0.20 s * 0,lO s b) a reinforcement; Pressure dwell time: 0,6
2、5 s f 0,20 s c) a rubber cover or alternatively, for type 5 only, a textile cover. Pressure drop time: 0,20 s + 0,lO s The hose shall be uniform in quality and free from porosity, air holes and foreign inclusions. Test pressure: Design working pressure as given in table2. 6 Dimensions and tolerantes
3、 7.2 Burst pressure requirement 6.1 The hose shall have a nominal bore in accord- ante with the requirements of table 1. When deter- mined in accordance with ISO 4671, the actual bore shall be within f 0,4 mm of the nominal bore. When tested in accordance with ISO 1402, the hose or hose assembly sha
4、ll withstand the minimum burst pressure given in table 2. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:50:30 MDTNo reproduction or networking permitted without license from IHS -,-
5、,- CJ ISO ISO 11425:1996(E) Table 2 - Hydrostatic-pressure requirements Type 1 2 3 4 5 Nominal bore mm 95 6,3 35 12.7 95 9.5 9.5 12,7 Design working pressure MPa 1,75 9.0 880 7,o 10.0 9,o 15,5 14.0 Minimum Proof pressure burst pressure MPa MPa 3,5 7,o 18,0 36,0 16,0 32,0 14,0 28,0 20,o 40.0 18.0 36.
6、0 31 ,o 62,0 28,0 56,0 NOTE - All pressure values specified are sauge Dressures. I 7.3 Change in length 7.6 Ozone resistance Hoses of types 1, 3 and 4 shall not Change in length by more than + 0 % and - 8 % and hoses of types 2 and 5 shall not Change in length by more than + 2 % and - 4 % at the app
7、ropriate design working pressure given in table2. When tested in accordance with ISO 7326:1991, method 1, the test piece shall show no sign of crack- ing. 7.4 Low-temperature flexibility After conditioning at a temperature of - 40 “C f 2 “C for a period of 72 h, bend a test piece around a mandrei ha
8、ving a diameter eight times the nominal outside diameter of the hose, using the method without torque measurements described in ISO 4672. 7.7 Volumetric expansion This requirement applies to type 3 and 4 hoses only. When tested by the method described in annex A, the hose or hose assembly shall comp
9、ly with the re- quirements of table 3. Table 3 - Volumetric expansion The test piece shall not fracture and the cover shall not show any Cracks or breaks. Volumetric expansion at 9 MPa I I 3 I 10 cm3/m to 26 cm3/m I After this test, the test piece shall be allowed to attain ambient temperature and s
10、hall then withstand the appropriate proof pressure given in table2, using the method described in ISO 1402, without any sign of leakage or other defect. 4 26 cm3/m to 55 cm3/m 7.8 Contamination Following the proof pressure test, the test piece shall be sectioned and the lining shall show no evidente
11、 of cracking upon visual examination. 7.5 Adhesion When determined by the method described in annex B, the total amount of impurities shall not ex- ceed 100 mg/m* and the maximum particle size shall be 70 Pm. When determined in accordance with ISO 8033, for type 1, 2, 3 and 4 hoses, and for type 5 h
12、oses sup- plied with a rubber cover, the adhesion between lining and reinforcement, between layers of reinforcement and between reinforcement and cover shall not be less than 1,5 kN/m. 7.9 Corrosion of end fittings When tested in accordance with ISO 9227 for 168 h, the hose assembly and fittings sha
13、ll show no evi- dence of corrosion of the base metal. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:50:30 MDTNo reproduction or networking permitted without license from IHS -,-,-
14、 ISO 11425:1996(E) 0 ISO 7.10 Proof pressure requirement Esch length of hose or each hose assembly subjected to the appropriate proof pressure given in table2, us- ing the method described in ISO 1402, for a period of 1 min, shall show no sign of rupture or leakage. 7.11.2.6 Examine the hose assembl
15、y visually for signs of Cracks or leakage, ignoring any leakage as- sociated with the couplings. 7.12 Low-pressure burst pressure requirement (type 4 hose assemblies only) 7.11 Gold-Start requirement (type approval test for type 4 hose assemblies only) 7.11.1 Requirement Fill the hose assembly with
16、test fluid (sec A.3) and maintain at - 40 “C f 2 “C3 for 12 h. The hose as- sembly shall then withstand a minimum burst press- ure of 36 MPa applied in accordance with ISO 1402. When tested in accordance with 7.11.2, the assembly shall show no signs of Cracks or leakage at the end of 15 cycles. 7.11
17、.2 Test method 7.11.2.1 Bend the hose assembly into a U shape, fill with test fluid (sec A.3) and lower the temperature to - 40 “C * 2 “C.3 7.11.2.2 Apply a pressure pulse of 11 MPa for 1,5 s, twenty times. 7.11.2.3 Allow the assembly to warm up to ambient laboratory temperature and leave for 2 h. 8
18、 Marking Esch length of hose shall be legibly and indelibly marked at intervais of no more than 250 mm with the following information: a) the manufacturers name or identification; b) the number of this International Standard and the hose type number; c) the nominal bore of the hose, in millimetres;
19、d) the date of manufacture (at least month and year); 7.11.2.4 Apply a pressure pulse of 11 MPa for 1,5 s, twenty times. 7.11.2.5 Repeat the procedure described in 7.11.2.1 to 7.11.2.4 (starting at “lower the temperature to - 40 “C Express the result as the average value of the vol- umes of test flu
20、id collected per metre of test piece. A.7 Test report c) the date of test; d) the volumetric expansion, expressed in cubic centimetres per metre; The test report shall include the following information: e) the test fluid used. a) a reference to this International Standard; Copyright International Or
21、ganization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:50:30 MDTNo reproduction or networking permitted without license from IHS -,-,- Q ISO ISO 11425:1996(EI Annex B (normative) Method of test for contamination B.l
22、Principle A Sample or hose assembly is filled with Petroleum ether and agitated. The contents are collected, the insoluble impurities filtered out, dried and weighed, and the largest parti- cle size measured. B.2 Reagent B.2.1 Petroleum ether (60 to 80 grade). B.3 Apparatus 8.3.1 Glass funnel. B.3.2
23、 Beaker, complying with the requirements of ISO 3819. 8.3.3 Ventilated drying oven, with a temperature range controllable between 0 “C and 85 “C f 5 “C. B.3.4 Balance, accurate to 0,l mg. B.3.5 Sintered-glass filter, porosity P 4 (sec ISO 4793). 8.3.6 Microscope. B.4 Procedure Take a Sample of hose
24、300 mm to 500 mm in length, or a complete hose assembly, and determine its internal surface area. Fill the hose or assembly with Petroleum ether (8.2.1), agitate and pour into the beaker (B.3.2). Refill the hose or assembly from the opposite end with Petroleum ether, agitate and pour into the beaker
25、. Filter the entire contents of the beaker through the tared sintered-glass filter (B.3.5) using a little fresh Petroleum ether if necessary to rinse out any remaining solids. Dry the filter in the drying oven (B.3.3) at 85 “C k 5 “C until constant mass is obtained and determine the total mass of in
26、- soluble impurities present. Examine the residue from the filter under a micro- scope (B.3.6) and measure the size of the largest particles in micrometres. B.5 Expression of results Calculate the total mass of insoluble impurities (“dirt”), expressed in milligrams per Square metre of the interior s
27、urface area of the hose or assembly un- der test. 8.6 Test report The test report shall include the following information: a) a reference to this International Standard; b) all details necessary for identification of the hose or hose assembly; c) the total mass of insoluble impurities and the Maximu
28、m particle size; d) the date of the test. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:50:30 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 11425:199
29、6(E) Annex C (informative) Typical outside-diameter ranges Typical outside-diameter ranges are given in table C.I. Table C.l - Typical outside-diameter ranges Dimensions in mllmetres Nominal bore Type 1 Type 2 Type 3 Type 4 Tvw 5 6.3 - 14.0 to 15,o - - - 9.5 15,9 to 17,9 18,3 to 19,8 19,l to 20,6 19
30、.1 to 20.6 19,l to 20.6 12,7 - 22,9 to 24,4 - - 22,2 to 23,8 8 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:50:30 MDTNo reproduction or networking permitted without license from IH
31、S -,-,- ISO 11425:1996(E) ICS 43.040.50; 83.140 Descriptors: rubber products, automotlve engineenng, hoses, rubber hoses. classification, speclfications, Performance, dimenslons, dimensional tolerantes, marking. Pnce based on 8 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:50:30 MDTNo reproduction or networking permitted without license from IHS -,-,-