What materials are typically used for aircraft plumbing lines?

The choice of metal tubing and fittings or flexible hose is standard for aircraft plumbing lines due to the high levels of strength, durability, and resistance to temperature and pressure variations these materials provide. Metal tubing is often made from materials such as aluminum, stainless steel, or titanium, which can withstand the harsh conditions encountered in flight and resist corrosion from fuels, oils, and other fluids commonly used in aviation.

Flexible hoses are also essential in aviation plumbing systems because they allow for movement and vibration within the aircraft while maintaining a secure and leak-proof connection. These hoses are usually reinforced and made from high-quality materials that can handle extreme pressures and temperatures.

In contrast, other materials like plastic tubing or fabric are generally unsuitable for high-pressure applications and may not provide the necessary durability and resistance required in an aircraft environment. Rubber and vinyl may not be able to withstand high temperatures and can degrade over time when exposed to aviation fluids. Composite materials and silicon are also not typically used in plumbing applications, as they do not offer the structural integrity needed to handle the pressures and conditions of aircraft systems.