BS ISO 7313:2020 pdf download.Aircraft — High temperature convoluted hose assemblies in polytetrafluoroethylene (PTFE).
4.2.2 Metals
Metals shall he of corrosion-resistant type or be suitably treated to resist corrosion due to fluid being conveyed and/or salt spray and atmospheric conditions to which the hose assembly can he subjected when in storage or during normal service use.
4.2.3 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 intended.
4.3 Design
4.3.1 General
The hose assembly shall consist of a convoluted PTFE inner tube which may be covered with convoluted woven glass cloth and other suitable material. The convoluted PTFE inner tube may also be reinforced with stainless steel wire braid and with end fittings suitable for the intended installation. This document shall specifically cover the hose assembly made up of the specified hose and the hose attachment mechanism of the fitting.
4.3.2 inner tube
The inner tube shall be of convoluted construction designed to promote easy bending. It shall be free from pitting or projections on the inner surface which can interfere with fluid flow.
4.3.3 Reinforcement
The reinforcement shall consist of a stainless-steel wire braid or braids of sufficient strength and corrosion resistance to meet the requirements of this document.
4.3.4 Interlayers
Interlayers, if used, shall be of suitable material.
4.3.5 Fittings
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 document conflict, this document shall take precedence.
4.4 Dimensions
4.4.1 Hose assembly dimensions
The dimensions of the hose assemblies shall be in accordance with Table 1.
4.5 Performance
4.5.1 General
Each hose assembly shall be free from defects of material, workmanship, and finish; shall conform
dimensionally to the requirements of this document; shall withstand the proof pressure specified
in Table 2 without imperfection or leakage occurring when tested as specified in 5.4.3; and shall be capable of performance requirements specified below.
4.5.2 Examination of product
In accordance with 5.4.2.
4.5.3 Proof pressure
In accordance with 5.4.3.
4.5.4 Elongation and contraction
In accordance with 5.4.4.
4.5.5 Leakage
In accordance with 5.4.5.
4.5.6 Room temperature burst pressure
In accordance with 5.4.6.
4.5.7 High temperature burst pressure
In accordance with 5.4.7.
4.5.8 Oil resistance
In accordance with 5.4.8.
4.5.9 Fuel resistance
In accordance with 5.4.9.
4.5.10 Flexibility and vacuum
In accordance with 5.4.10.
4.5.11 Pressure impulse
In accordance with 5.4.11.
4.5.12 Conductivity (type 2 only)
In accordance with 5.4.12.BS ISO 7313 pdf download.