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Aircraft Hose Construction - ReinforcementMaterials flowing through the inner tube exert pressures on the inner wall of the tube. Pressure may vary from vacuum to extremely high pressures. Since the inner tube is designed only for containing and directing the flow, another element must be introduced about the tube to help it old back internal pressures and thus increase the burst pressure of the tube. This reinforcement is termed the carcass.Reinforcement materials: The magnitude of pressure determines the type of material utilized to reinforce the tube. For low pressure applications, the reinforcement, or carcass, may be of cotton or synthetic material, such as nylon, rayon, Dacron, carbon fiber, or other polyester fabric woven, braided or wrapped about the tube. Higher pressures require stronger materials, such as carbon steel or stainless steel wire braided or spiraled about the tube. In some applications, copper or bronze wire reinforcement may be used. Reinforcement plies: Economy, flexibility and size must be considered when choosing
a reinforcement material and arranging it about the tube for a given pressure
range. Low pressure applications may require a single ply or layer of fabric,
while high pressures may require as many as ten layers of steel wire reinforcement.
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Cross
section of 300-8D fitting used on Stratoflex 111-8 hose.