1、II BSI M*57 65 m 3624669 0099478 O m British Standard IS0 7313-1984 M 57: 1985 UDC 629.7 : 621 B43.31.4 British Standards Inaitution. No part of this publication may be photocopied or otherwise reproduced without the prior permidon in writing of BSI British Standard Aerospace Series : Specification
2、for High temperature convoluted hose assemblies in polytet raf luoroet hylene ( PTFE) for aerospace applications IS0 title: Aircraft - High temperature convoluted hose assemblies in polytetrafluoroethylene (PTFE) Srie arospatiale. Tuyauterie flexible, haute temprature, convolute, en polyttrafluorthy
3、lne (PTFE) usage aronautique Luft- und Raumfahrt-Reihe. Gewellte Schlaucheitungen aus Polytetraf luorthylen (PTFE) fr hohe Temperaturen fr die Luft- und Raumfahrt Contents National foreword Committees responsible Specification I. Scope and field of application 2. References 3. Requirements 4. Qualit
4、y assurance provisions 5. Ordering data Page 1 Back cover National foreword This British Standard has been published under the direction of the Aerospace Standards Committee. It is identical with IS0 7313-1984 Aircraft - High temperature convoluted hose assemblies in polytetrafluoroethylene (PTFE),
5、published by the International Organization for Standardization (ISO). IS0 7313 was produced as a result of international discussion in which the UK took an active part. Terminology and conventions. The text of the international standard has been approved as suitable for publication as a British Sta
6、ndard without deviation, Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as th
7、e decimal marker. Wherever the words International Standard appear, referring to this standard, they should be read as British Standard. -. - - Tables 1. Hose assembly dimensions 2. Physical requirements of hose assemblies 3. Valves for vacuum test 4. Qualification test schedule Figures 1. Pressure
8、surge curve 2. Conductivity test diagram Page 8 9 Where the designation IS0 731 3 (see 3.7.21 appears, it should be read as British Standard M 57. Cross-references International standard Corresponding British Standard IS0 3768-1 976 BS 5466 Methods for corrosion testing of metallic coatings Part 1 :
9、 1977 Neutral salt spray test (NSS test) (Iden t ical ) The Technical Committee has reviewed the provisions of IS0 756 : Parts 1, 2 and 3, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard for IS0 75
10、6 : Parts 1,2 and 3 is BS 1595 : 1965 isoPropy1 alcohol. Compliance with a British Standard does not of itself confer immunity from legal obligations. British Standards Institution _- -. BSI M*57 85 I 1624669 O099479 2 I British Standard M 57 : 1985 1 Scope and field of application This Internationa
11、l Standard specifies characteristics of hose assemblies with corrosion-resistant metallic braid and con- voluted polytetrafluoroethylene (PTFE) inner tube for use in air- craft fluid systems at temperatures between - % and +200 OC and at nominal pressures, depending on bore size, up to 6,8 MPa. Spec
12、ial approval from the proper national authority may be required if these hoses are to be part of a pressurized gas storage system. Two types of hose assembly are covered in this International Standard : Type 1 : Non-conductive inner tube Type 2 : Conductive inner tube 2 References IS0 756, Propan-2-
13、01 for industrial use - Methods of test - Part I: General. Patt 2: Determination of acidity - Titrimetric method. Part 3: Test for miscibility with water. IS0 3768, Metallic coatings - Neutral salt spray test INSS test). 3 Requirements 3,l Qualification The hose assemblies furnished under this Inter
14、national Stan- dard shall be a product identical to that which has been tested and has passed the qualification tests herein and shall be suitable for use in aircraft fluid systems under conditions specified herein. spray and atmospheric conditions to which the hose assembly may be subjected when in
15、 storage or during normal service use. 3.2,2 Non-metallic materials All materials used in the hose assemblies shall be “non-ageing“ for storage and shall be compatible with system fluids and other hose assembly materials and suitable for the service in- tended. 3.3 Design The hose assembly shall con
16、sist of a convoluted PTFE inner tube which may be covered with convoluted woven glass cloth and other suitable material and reinforced with stainless steel wire braid and with end fittings suitable for the intended in- stallation. This International Standard shall specifically cover the hose assembl
17、y made up of the specified hose and the hose attachment mechanism of the fitting. 3.3.1 Inner tube The inner tube shall be of convoluted construction designed to promote easy bending. It shall be free from pitting or pro- jections on the inner surface which may interfere with fluid flow. 3.3.2 Reinf
18、orcement The reinforcement shall consist of a stainless steel wire braid or braids of sufficient strength and corrosion resistance to meet the requirements of this International Standard. 3.3.3 Interlayers Interlayers, if used, shall be of suitable material. 3.3.4 Fittings 3.2 Materials The hose ass
19、emblies shall be uniform in quality and free from defects in material as is consistent with good manufacturing practice. Materials shall conform to applicable specifications and the requirements specified herein. 3.2.1 Metals Metals shall be of corrosion-resistant type or be suitably treated to resi
20、st corrosion due to fluid being conveyed and/or salt 2 The fittings shall be specifically designed for this hose and materials shall be selected for the specific operating conditions. When the requirements for these fittings and this International Standard conflict, this International Standard shall
21、 govern. Threads shall conform to IS0 metric screw threads. 3.3.5 Dimensions The dimensions of the hose assemblies shall be in accordance with table 1. shall conform dimensionally with the requirements of this specification ; shall withstand the proof pressure specified in table 2 without imperfecti
22、on or leakage occurring when tested as specified in 4.4.2; and shall be capable of performance requirements specified as follows : 0 3.4.1 Examination of product In accordance with 4.4.1. 3.4.2 Proof pressure In accordance with 4.4.2. 3.4.3 Elongation and contraction In accordance with 4.4.3. 3.4.4
23、Leakage In accordance with 4.4.4. e C max. 11.3 14,3 20,o 21,9 27,8 33,4 39,7 47,7 60.4 7-31 87,3 112,7 D max. 14,O 19.1 a3 24,l 32,5 38,l 432 50,8 65.0 76,2 94.0 119,4 3.4.5 Room temperature burst pressure In accordance with 4.4.5. 3.4.6 High temperature burst pressure In accordance with 4.4.6. 3.4
24、.7 Oil resistance In accordance with 4.4.7. 3.4.8 Fuel resistance In accordance with 4.4.8. 3.4.9 Flexibility and vacuum In accordance with 4.4.9. 3.4.10 Pressure surge In accordance with 4.4.10. 3.4.11 Conductivity (type 2 only) In accordance with 4.4.1 1. 3 _ _ BSI M*57 85 I Lb24bb OO948L O I Brit
25、ish Standard M 57 : 1985 DN Hose sire 06 10 . 12 16 20 25 32 Nominal pressure max. MPa (bars) 6,8 (681 6,8 (681 6,8 (681 6,1 (611 6.1 (611 6,l (611 6,l (611 40 5,l (511 50 1,7 (17) 63 0,6 (61 80 0,6 (61 0,6 (61 u Table 2 - Physical requirements of hose assemblies MPa (bars) MPa (bars) MBa (bars) sam
26、ples 13,6 (1361 13,6 (1361 13,6 (1361 12.2 (122) 12,2 (1221 12,2 (122) 12,2 (1221 10,2 (1021 3,4 (34) 1,2 (12) 1,2 (121 1.2 (121 27,2 (2721 27,2 (272) 27,2 (272) 24,4 (244) 24.4 (2441 24,4 (244) 24,4 (2441 20,4 (2041 6,8 i681 2,4 (241 2,4 (241 2,4 (241 19,0 (1901 19,0 (190) 19,0 (1901 17,O (1901 17.
27、0 (9701 17,O (1701 17,O (170) 14,2 (9421 4.7 (49) 1,6 (161 l,e (16) 1,6 (161 32 57 73 76 95 127 160 190 255 320 380 610 11 11 11 11 11 11 4 7 4 7 4 7 4 7 4 7 4 7 460 460 460 460 460 460 460 510“ 460 635“ 460 790“ 460 965“ 460 1 145* 460 1525“ * Assembly length required for pressure surge test. 3.5 L
28、ength For Type 2 testing, one additional sample as noted in 4.4.11 is required. 3.7.2 Assembly Hose assembly lengths shall be specified in the following in- crements only : 500 mm long and under : not less than 5 mm; 500 to 1 o00 mm long: not less than 10 mm; 1 o00 to 1 500 mm long : not less than 2
29、0 mm ; over 1 500 mm long : not less than 30 mm. Tolerances on hose assembly lengths shall be as follows : I3 mm for lengths under 500 mm; f7 mm for lengths from 500 to 900 mm; f 13 mm for lengths from 900 to 1 300 mm; f 1 % for lengths over 1 300 mm. 3.6 Interchangeability All parts having the same
30、 manufacturers part number shall be directly and completely interchangeable with respect to installa- tion and performance. 3.7 Identification of product Equipment, assemblies and parts shall be marked for identifica- tion in accordance with appropriate standards to the extent ap- plicable. The foll
31、owing special marking shall be added : 3.7.1 Fittings The manufacturers name or trademark shall be permanently marked on each end fitting. The assembly shall be identified by a permanent marking on the end fitting or on a permanent band containing the following markings : a) assembly manufacturers n
32、ame or trademark; b) complete hose assembly part number ; c) nominal pressure in megapascals ; d) pressure test symbol “PT“; e) assembly specification “IS0 7313“, and “type 1“ or “type 2“; f) date of hose assembly manufacture expressed in terms of month and year. 3.8 Workmanship 3.8.1 General The ho
33、se assembly including all parts shall be constructed and finished in a thoroughly workmanlike manner. All surfaces shall be free from burrs. All sealing surfaces shall be smooth, except that annular tool marks up to 2,s pm maximum are acceptable. 3.8.2 Dimensions and tolerances All pertinent dimensi
34、ons and tolerances, where inter- changeability, operation or performance of the hose assembly may be affected, shall be specified on all drawings. 4 3.8.3 Cleaning All hose assemblies shall be free from oil, grease, dirt, or any other foreign material, both internally and externally. Unless otherwis
35、e specified, hose assemblies shall be cleaned by flushing with suitable degreasing solvent, blow drying with air, and sealing with clean end caps. 3.8.4 Openings and covers Openings shall be suitably protected against ingress of foreign material; all threads shall be protected against damage. All pr
36、o- tective covers shall be of a configuration that prohibits assembly with the mating part without removal of the cover. 4 Quality assurance provisions 4.1 Classification of tests The inspection and testing of hose assemblies shall be classified as follows : a) acceptance (see 4.21 ; bl qualificatio
37、n testing (see 4.5). 4.2 Acceptance tests Acceptance tests shall consist of a) individual test; b) sampling test; cl periodic control test. 4.2.1 Individual tests Each hose assembly delivered under this International Standard shall be subjected to the following tests : a) examination of product (see
38、 4.4.1); b) proof pressure test (see 4.4.21. 4.2.2 Sampling test The following test shall be performed on hose assemblies picked at random from each lot. A lot is defined as 500 assem- blies of a given dash size, manufactured by the same process free from any deviations likely .to have a significant
39、 effect on product quality. 4.2,2.1 One hose assembly shall be consecutively subjected to the following tests : a) elongation and contraction test (see 4.4.3); b) leakage test (see 4.4.4). 4.2.3 Periodic control test A fuel resistance test (see 4.4.8) shall be performed on at least two assemblies fo
40、r each periodic control test selected from each 5 o00 hose assemblies for each dash size, not necessarily manufactured during one continuous production run. e Lb24bb9 0099482 2 m British Standard M 57 : 1985 4.2.4 Rejection and retest When one item selected from a production run fails to meet the sp
41、ecification, no items still on hand or later produced shall be accepted until the extent and cause of failure are determined and corrective action, as necessary, taken. For operational reasons, the individual tests may be continued pending the investigation of a sampling or periodic control test fai
42、lure. Final acceptance of items on hand or produced later shall not be made until it is determined that items meet the re- quirements on which the rejection was based. 4.3 Test conditions 4.3.1 Preparation of specimens 4.3.1.1 General Length of the sample hose assemblies shall be in accordance .with
43、 table 2 unless otherwise specified. 4.3.2 Test fluids Unless otherwise specified, the test fluid shall be a petroleum base hydraulic fluid or water. When a high temperature test is performed, the test fluid shall be a synthetic base lubricating oil unless otherwise specified by the procuring author
44、ity. 4.3.3 Temperature measurements Unless otherwise specified, temperature measurements shall be taken within 150 mm of the hose assemblies under test. Ail temperatures, unless otherwise specified, shall have a tolerance of : oc. 4.3.4 Test pressure All test pressures, unless otherwise specified, s
45、hall have a tolerance within f2 %. 4.4 Performance tests See table 4 for test schedule. 4.4.1 Examination of product All hose assemblies shall be examined to determine confor- mance to this specification with respect to material, size, workmanship and identification. Broken or missing reinforcing wi
46、res or any other evidence of malfunction shall be cause for rejection. Crossed over reinforcing wires shall not be cause for rejection. . 4.4.2 Proof pressure test All hose assemblies shall be pressure-tested to the values specified in table 2 for a period of not less than 30 s and not more than 5 m
47、in. All complete hose assemblies used for the tests described in this International Standard shall have this proof pressure test applied to them. Any evidence of leakage from hose or fittings or any other evidence of malfunction shall constitute failure. 5 - _. - BSI M*57 85 1624669 0099483 4 I Brit
48、ish Standard M 57 : 1985 4.4.3 Elongation and contraction test The test assembly shall be held in a straight unpressurized con- dition and a 250 mm standard length marked off on the hose. It shall then be pressurized to operating pressure for 5 min minimum. At the end of this 5 min period, and while
49、 still pressurized, the standard length shall be measured and recorded. The standard length of hose shall not change in length more than 1 % . 4.4.4 Leakage test Two hose assemblies of each size shall be subjected to this test. The assemblies shall be pressurized while at room temperature to 0,17 MPa for a minimum of 5 min. The pressure shall be increased to a value equal to 70 % of the minimum . room temperature burst pressure specified in table 2 and again held for a minimum of 5 min. The pressure shall be completely released and a
