ISO 7313:2020
(Main)Aircraft — High temperature convoluted hose assemblies in polytetrafluoroethylene (PTFE)
Aircraft — High temperature convoluted hose assemblies in polytetrafluoroethylene (PTFE)
This document specifies characteristics of hose assemblies with corrosion‑resistant metallic braid and convoluted polytetrafluoroethylene (PTFE) inner tube for use in aircraft fluid systems at temperatures between ‑55 °C and +200 °C and at nominal pressures, depending on bore size, up to 6,8 MPa. Special approval from the proper national authority can be required if these hoses are to be part of a pressurized gas storage system. Two types of hose assembly are covered in this document: — Type 1: Non‑conductive inner tube; and — Type 2: Conductive inner tube.
Aéronefs — Tuyauterie flexible, haute température, convolutée, en polytétrafluoréthylène (PTFE)
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 7313
Second edition
2020-03
Aircraft — High temperature
convoluted hose assemblies in
polytetrafluoroethylene (PTFE)
Aéronefs — Tuyauterie flexible, haute température, convolutée, en
polytétrafluoréthylène (PTFE)
Reference number
©
ISO 2020
© ISO 2020
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Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 1
4.1 Qualification . 1
4.2 Materials . 1
4.2.1 General. 1
4.2.2 Metals . 2
4.2.3 Non-metallic materials . 2
4.3 Design . 2
4.3.1 General. 2
4.3.2 Inner tube . 2
4.3.3 Reinforcement . 2
4.3.4 Interlayers . 2
4.3.5 Fittings . 2
4.4 Dimensions . 2
4.4.1 Hose assembly dimensions . 2
4.4.2 Length. 3
4.5 Performance . 4
4.5.1 General. 4
4.5.2 Examination of product . 4
4.5.3 Proof pressure . 4
4.5.4 Elongation and contraction . 4
4.5.5 Leakage . 4
4.5.6 Room temperature burst pressure . . 4
4.5.7 High temperature burst pressure. 4
4.5.8 Oil resistance . 4
4.5.9 Fuel resistance . 4
4.5.10 Flexibility and vacuum . 4
4.5.11 Pressure impulse . 4
4.5.12 Conductivity (type 2 only) . 4
4.6 Part numbering of interchangeable parts . 5
4.7 Product identification . 5
4.7.1 General. 5
4.7.2 Fittings . 5
4.7.3 Assembly . 5
4.8 Workmanship . 6
4.8.1 General. 6
4.8.2 Dimensions and tolerances . 6
4.8.3 Cleaning . 6
4.8.4 Openings and covers . . 6
5 Quality assurance provisions . 6
5.1 Classification of tests . 6
5.2 Acceptance tests . 6
5.2.1 General. 6
5.2.2 Individual tests . 6
5.2.3 Sampling test . 7
5.2.4 Periodic control test . 7
5.2.5 Rejection and retest. 7
5.3 Qualification testing . 7
5.4 Inspection methods . 9
5.4.1 General. 9
5.4.2 Examination of product .10
5.4.3 Proof pressure test .10
5.4.4 Elongation and contraction test . .10
5.4.5 Leakage test . .10
5.4.6 Room temperature burst pressure test .10
5.4.7 High temperature burst pressure test .10
5.4.8 Oil resistance test .10
5.4.9 Fuel resistance test .11
5.4.10 Flexibility and vacuum test .11
5.4.11 Impulse test .12
5.4.12 Conductivity test .12
5.4.13 Salt corrosion test .13
5.5 Test conditions .13
5.5.1 Preparation of specimens .13
5.5.2 Test fluids .13
5.5.3 Temperature measurements .13
5.5.4 Test pressure .13
6 Ordering data .13
Bibliography .
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