Protecting Hoses from Heat

How does heat affect a hose assembly?

Hydraulic systems are used in the manufacturing, construction, energy, automotive, metals, aerospace, and marine industries. They are quite common and power heavy machinery, robots, automobile brakes, manufacturing equipment, airplanes, and more. To transmit power, pumps push fluids through hydraulic systems from one point to another. Because the fluids are carried through hoses, it’s important that these hoses are protected from high temperatures. When a hose assembly is exposed to extreme heat, it may be damaged, inhibiting productivity. Firesleeves preserve the integrity of hose assemblies, ensuring proper and continued operation of  hydraulic systems.

How does heat affect a hydraulic system?

Fluids, such as oil, may break down when exposed to excessive heat in a hydraulic system. Optimally, oil temperatures should not exceed 180°F (82°C). At high temperatures, the oil’s life is shortened, producing acids and sludge and corroding metal parts. As a result, valves become clogged, seals may be broken, and hydraulic system components degraded. Heat may also lower hydraulic oil viscosity, affecting the lubrication of moving parts and equipment production. Davlyn’s firesleeve protects hydraulic hoses from external heat damage, increasing the life of the hose and preventing heat-related breakdowns.

What is hose size?

The hydraulic power industry uses a system of measurement called Dash Numbers or Dash Sizes to identify hose and fitting size. The Dash Number is the measure of a hose’s Inner Diameter (I.D.) in sixteenths of an inch. The inside diameter of the hose must be sufficient to minimize pressure loss and prevent hose damage from friction or turbulence. The hose I.D. must be sized accurately to obtain the proper flow velocity for the system. Slow fluid flow results in sluggish system performance and high fluid flow causes pressure drops, system deterioration, and leaks. Davlyn aerospace and industrial firesleeves for hose protection are available in sizes from ¼” (6.4mm) through 5” (127mm). Davlyn firesleeve with hook & loop closure is available in standard sizes 1″ (25.4mm) through 12″ (304.8mm) and can also be cut to size and formed into a custom sleeve of almost any diameter. Hose Outside Diameter (O.D.) must be measured accurately to determine the correct inside diameter of the firesleeve to use.

At what temperature does hydraulic oil freeze?

Low temperature can disrupt the stability of hydraulic oil. The freezing point of hydraulic oil is -10°F (-23°C), so it’s highly unlikely that it will freeze in most operating environments. Very low fluid temperatures usually result from exposure of some component to the environment, particularly when operation takes place in extremely cold or high-altitude conditions. Low temperatures may cause hydraulic oil to increase in viscosity, decreasing flow and resulting in mechanical failure.

Will protecting a hose with firesleeve change heat’s effect on the hose?

Protecting a hose with firesleeve reduces the chance of equipment and component impairment due to excessive heat. Resistant to hydraulic fluids, lubricating oils, and fuels, Davlyn Silco Sleeve® firesleeves and firesleeves with hook & loop closure insulate against energy loss in hoses and protect cables and hoses from splashes of molten metal and heavy sparks. Davlyn’s aerospace and industrial firesleeves are coated with the same proprietary silicone rubber compound for increased durability and enhanced heat and flame protection. Silco Sleeve® firesleeve protects continuously to 500°F (260°C) and will withstand a molten splash at 2200°F (1200°C).

Davlyn has been designing and manufacturing technical textiles for decades, with roots dating back to 1909. Today, our products continue to keep heat in its place. Contact us for more information about our firesleeves for hose assembly protection.