1、 Reference number ISO 7314:2002(E) ISO 2002INTERNATIONAL STANDARD ISO 7314 Third edition 2002-11-01 Aerospace Fluid systems Metal hose assemblies Aronautique et espace Systmes de fluides Tuyauteries flexibles mtalliques ISO 7314:2002(E) PDF disclaimer This PDF file may contain embedded typefaces. In
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6、1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2002 All rights reservedISO 7314:2002(E) ISO 2002 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative reference 1 3 Terms and definitions. 1 4 Requiremen
7、ts 1 4.1 Qualification. 1 4.2 Materials. 2 4.3 Design and construction 2 4.4 Dimensions, masses and ratings 4 4.5 Performance 5 4.6 Part numbering of interchangeable parts. 6 4.7 Product identification . 7 4.8 Workmanship. 7 5 Quality assurance provisions 7 5.1 Suppliers responsibility. 7 5.2 Users
8、responsibility. 8 5.3 Classification of inspections . 8 5.4 Test methods . 12 6 Preparation for delivery 17 6.1 Closures . 17 6.2 Packaging 17 6.3 Marking of containers. 17 Bibliography 18 ISO 7314:2002(E) iv ISO 2002 All rights reservedForeword ISO (the International Organization for Standardizatio
9、n) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International 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 rep
10、resented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards a
11、re drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical 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 Internatio
12、nal Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. IS
13、O 7314 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components. This third edition cancels and replaces the second edition (ISO 7314:1994), which has been technically revised. INTERNATIONAL STANDARD ISO 7314:2002(E) ISO 2
14、002 All rights reserved 1Aerospace Fluid systems Metal hose assemblies 1 Scope This International Standard gives specifications for medium pressure, high temperature, flexible metal hose assemblies suitable for continuous operation in liquid and pneumatic systems from 55 C to + 400 C, with short dur
15、ation excursions up to + 650 C. The hose assemblies covered by this International Standard are intended for use in aerospace applications for conveying air and other gases in pneumatic systems, bleed air systems, heating and ventilating systems and instrument air systems when used at pressures and t
16、emperatures within the limits laid down in Tables 2 and 3. This International Standard does not cover flow velocity in such assemblies exceeding 54 m/s; higher velocities require special vibration-dampening devices. Hose assemblies supplied to the specifications laid down in this International Stand
17、ard may be of two types: Type 1: Convoluted inner tube welded, of moderate mass and moderate flexibility. Type 2: Convoluted inner tube seamless or butt-welded and redrawn, of low mass and high flexibility. 2 Normative reference The following normative document contains provisions which, through ref
18、erence in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of app
19、lying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 8625-1:1993, Aerospace Fluid systems Vocabulary
20、 Part 1: General terms and definitions related to pressure 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 8625-1 apply. 4 Requirements 4.1 Qualification Any hose assembly supplied to the specifications laid down in this International S
21、tandard shall be a product that, concerning hose construction and end-fitting attachment method, is identical to specimens that have been tested and that have passed the qualification tests specified in clause 5. Qualified hose assemblies of type 2 construction may be automatically substituted for t
22、ype 1 hoses, but type 1 hoses may not be substituted for type 2 hoses unless customer approval is given. ISO 7314:2002(E) 2 ISO 2002 All rights reserved4.2 Materials The hose assembly materials shall be uniform in quality, free from defects and suitable for use in continuous ambient and/or fluid tem
23、peratures ranging from 55 C to + 400 C with short fluid temperature excursions up to 650 C. The materials shall be consistent with good manufacturing practices and shall conform to the applicable specifications and the requirements specified in this International Standard. 4.3 Design and constructio
24、n 4.3.1 General The hose assembly shall consist of a convoluted, stabilized, pressure-carrying tube, in corrosion-resistant steel, suitable for the intended use, and uniform in size and wall thickness. The hose assembly shall be reinforced with stabilized corrosion-resistant steel braided wire and s
25、hall have stabilized corrosion-resistant steel end fittings and nuts. End fittings shall be attached to the hose by welding. The end-fitting outlet design shall mate with applicable end fittings. 4.3.2 End fittings The hose-to-fitting joint shall be welded in a suitable manner in order to meet the r
26、equirements specified in this International Standard. It is recommended that fitting joints be kept to a minimum so as to reduce potential leakage paths. The mass of type 2 fittings shall not exceed the values given in Table 1. Type 1 fitting masses shall be as given on the approved drawing. Table 1
27、 Masses for type 2 hose assemblies with standard 37 or 24 fittings Maximum masses Hose nominal size Hose Standard end fittings g DN g/cm Straight 45 elbow 90 elbow 05 1,5 20 20 20 06 2 23 23 23 08 2,5 27 29 29 10 3 32 36 36 12 4,2 55 59 64 16 5,3 82 91 100 20 6,5 163 177 186 25 9 218 259 291 32 12 3
28、58 413 449 40 19 486 507 552 50 24 768 810 845 63 35 4.3.3 Hose 4.3.3.1 Inner tube construction In the case of type 1 hoses, the inner tube shall be an annular or helical, convoluted flexible tube made from welded, stabilized austenitic stainless steel. ISO 7314:2002(E) ISO 2002 All rights reserved
29、3In the case of type 2 hoses, the inner tube shall be an annular, convoluted flexible tube of seamless or butt-welded and redrawn construction using stabilized austenitic stainless steel. For either type, the inner tube shall be uniform in size and quality, and free from pitting and other defects. T
30、here shall be no inner tube splices on hose assemblies shorter than or equal to 1 m in length. One splice is allowed for each additional metre of hose assembly length. Splices are undesirable, but, if required, shall be low- profile welds in accordance with 4.3.4 and Figure 1. After welding, the con
31、volutions shall be closed as shown in Figure 1. Key 1 Convoluted metal hose inner tube 2 Fusion weld 3 High-temperature braze alloy a Maximum 5 l. b Normal convolution spacing specified by supplier design. Figure 1 Inner tube splice configuration 4.3.3.2 Reinforcement The reinforcement shall be a su
32、itably braided construction using stabilized austenitic stainless steel wire in such a manner as to meet the requirements specified in this International Standard. There shall be no splices, missing loops, kinks or broken wires in the braid wire reinforcement. 4.3.4 Welds All welds shall be fusion w
33、elds suitable for the intended use. Filler wire, if required, shall be compatible with the weld material used. Equivalent supplier or other comparable welding specifications may be substituted subject to prior approval by the purchaser. 4.3.5 Heat treatment If stress-relieving of austenitic stainles
34、s steel welds is required in order to meet corrosion and embrittlement resistance, the joints shall be stress-relieved at 895 C 15 C for 2 h 15 min. ISO 7314:2002(E) 4 ISO 2002 All rights reserved4.4 Dimensions, masses and ratings 4.4.1 Hose diameter The inside diameter of the convoluted hose and th
35、e outside diameter of the braid covering shall be as given in Table 2. Table 2 Dimensions and performance requirements for hose assemblies Hose Inside diameter min. Outside diameter max. Fitting Bore a min. Operating pressure at 20 C b max. Proof pressure at 20 C b min. Proof pressure at 20 C b min.
36、 Hose nominal size DN mm mm mm kPa bar kPa bar kPa bar 03 2 6 2 13 750 138 20 650 207 55 150 552 04 3 7 2,5 13 750 138 20 650 207 55 150 552 05 4 9,9 3 13 750 138 20 650 207 55 150 552 06 5,5 13 3,5 13 750 138 20 650 207 55 150 552 08 7 15 5 12 000 120 18 000 180 48 000 480 10 8,5 18 6,4 11 000 110
37、16 500 165 44 000 440 12 11 20,5 9,1 9 600 96 14 500 145 38 600 386 16 14 27 11,6 8 300 83 12 400 124 33 000 330 20 17,5 31,5 14,4 7 200 72 10 700 107 29 000 290 25 23 38 19,3 5 500 55 8 300 83 22 000 220 32 30 47 23,4 3 800 38 5 700 57 15 200 152 40 36 57 32 3 000 30 4 500 45 12 000 120 50 48 70 42
38、 2 400 24 3 600 36 9 600 96 63 60 85 55 1 800 18 2 700 27 7 200 72 aFor ball check diameter see 4.4.2. bFor pressure requirements at elevated temperature, multiply the value by the factor given in Table 3. Table 3 Factor for correcting pressure requirements at elevated temperature (see Table 2) Mate
39、rial Austenitic chrome/nickel steel stabilized for carbide precipitation Operating temperature, C 20 50 100 150 200 250 300 350 400 450 500 550 600 650 Correction factor 1 0,91 0,84 0,78 0,73 0,69 0,65 0,62 0,6 0,58 0,57 0,57 0,56 0,55 4.4.2 Assembly internal diameter When bent to the appropriate mi
40、nimum static bend radius as specified in Table 4, the hose assembly shall permit the free passage of a solid rigid sphere throughout its length. The diameter of the sphere shall be 90 % of the appropriate minimum internal diameter of the end fittings as specified in Table 2. When elbow fitting is us
41、ed, the diameter of the sphere shall be 85 % of the appropriate minimum internal diameter of the end fittings as specified in Table 2, to accept some elbow ovality. ISO 7314:2002(E) ISO 2002 All rights reserved 54.4.3 Bend radius The requirements for the minimum bend radius of hoses shall be as give
42、n in Table 4. The bend radius shall be measured to the centreline of the hose. Table 4 Minimum centreline bend radius Minimum bend radius mm Type 1 hose assembly Type 2 hose assembly Hose nominal size DN Static Dynamic Static aDynamic 03 100 200 04 100 200 05 100 200 50 100 06 100 200 50 100 08 125
43、250 65 130 10 150 300 75 150 12 175 350 100 200 16 200 400 115 230 20 235 470 125 250 25 310 620 150 300 32 370 740 175 350 40 450 900 225 450 50 550 1 100 275 550 63 700 1 400 350 700 aNo flexure in service. 4.4.4 Assembly length Hose assembly lengths shall be as specified on the applicable product
44、 standard or drawing. 4.4.5 Masses Maximum masses of type 2 hose assemblies, with standard 37 or 24 fittings, shall be as given in Table 1. Maximum masses for type 1 hose assemblies and for type 2 hose assemblies with other fittings shall be as stipulated on the suppliers drawing when presented to t
45、he purchaser for approval. 4.5 Performance 4.5.1 General The hose assembly operating proof and burst pressure ratings and minimum bend radius, as given in Tables 2 and 4 respectively, shall be verified by proving that the performance requirements of 4.5.2 to 4.5.9 are met or exceeded, through qualif
46、ication testing as specified in clause 5. Compliance with performance requirements shall be maintained by adherence to the quality assurance provisions specified in clause 5. ISO 7314:2002(E) 6 ISO 2002 All rights reserved4.5.2 Examination of product Each assembly shall conform dimensionally and mat
47、erially to the applicable product standard or drawing and to all requirements of this International Standard when examined in accordance with 5.4.1. 4.5.3 Proof pressure test The hose assembly shall withstand the applicable proof pressure, specified in Table 2, at room temperature (i.e. at 20 C) wit
48、hout leakage or evidence of any permanent deformation or malfunction that would affect hose assembly installation, removal or use when tested in accordance with 5.4.2. 4.5.4 Corrosion test The hose assembly shall be capable of withstanding the proof pressure requirements specified in 4.5.3 after 50
49、immersion cycles in a 35 g/l sodium chloride (NaCl) solution in accordance with 5.4.3. 4.5.5 Vibration test The hose assembly shall have no broken braid wire and shall be capable of withstanding, without leakage, the proof pressure requirements specified in 4.5.3, after vibration testing in accordance with 5.4.4. 4.5.6 Flexure/pressure cycling endurance test The hose assembly shall have no broken braid wire and shall be capable of withstanding the proof pressure req
