Fire protection is a critical part of aircraft engineering. Among the many components that protect airplanes and other types of aircraft from fire hazards are fire sleeves. Consisting of hollow tubes or “sleeves” made of fire-resistant materials, they shield hoses, wires, cables and lines from heat and potential fire. Below are five important things to consider when choosing a fire sleeve.
#1) Materials
You should consider the materials when choosing a fire sleeve. While they are all fire-resistant, fire sleeves are available in different materials. Most fire sleeves are made of at least two materials: one material for the inner layer and another material for the outer layer. Braided fiberglass, for instance, is often used for the inner layer, whereas silicone rubber is used for the outer layer.
#2) Max Temperature
One of the most important things to consider when choosing a fire sleeve is the maximum temperature. High-quality fire sleeves should be able to handle up to 500 degrees Fahrenheit. Paper, of course, burns at 451 degrees Fahrenheit. With a max temperature of 500 degrees Fahrenheit, fire sleeves provide a high level of fire protection for the enclosed components.
#3) Durability
How durable is the fire sleeve? Since they are commonly used in airplanes and other types of aircraft, fire sleeves are often installed in tight spaces alongside other parts. This can result in friction that wears down weak or low-quality fire sleeves. Fortunately, most fire sleeves are designed to withstand physical force such as this without degrading. The silicone rubber outer sleeve, for instance, is naturally resistant to tears.
#4) Size
You should choose a fire sleeve in the right size. Generally speaking, fire sleeves should have a slightly larger diameter than that of the hoses, wires, cables and lines with which they are used. Therefore, you should measure the diameter of these components and use that number as a baseline when choosing a fire sleeve. Make sure the fire sleeve is slightly larger so that the components will fit inside it.
#5) Installation
Different types of fire sleeves have different installation processes. Some of them are split with a closure mechanism, such as a zipper. You’ll need to open them by pulling the zipper, after which you can place the components inside them. Other fire sleeves feature a simpler design consisting of a fully closed tube or sleeve. Regardless, you should consider the installation process when choosing a fire sleeve.
In Conclusion
Choosing the right fire sleeve is essential for ensuring fire protection. By carefully evaluating the material composition, maximum temperature rating, durability, size and installation method, you can find the perfect fire sleeve for your aerospace application.
