Rubber hoses can be used in many industries. There are many things to consider when choosing the right hose, whether you need an air brake or fluid power hose.
Large diameter rubber hoses are typically made through a process called spiral wrapping. This type of hose usually has reinforced and outer layers to help it handle the high pressures of its application.
Large diameter rubber hoses have certain characteristics
A rubber hose is used to convey fluid in hydraulic or process systems. It is a flexible conduit that is reinforced with multiple material layers to handle the pressure within the system it is installed in.
A rubber hose generally has three layers: a seamless synthetic rubber tub; one or more reinforcing layers made of braided, spiraled, or synthetic fiber, and an outer cover. Each layer is a specific design feature that is determined by the fluid, temperature, and pressure ranges for which it’s intended.
Motor vehicle industry is the largest hose consumer, accounting for more than one-third of total demand. This includes OEM and replacement hoses that are used in engines, steering and brake systems, as well as other key components.
High-value, customized hoses designed to function in environmentally harsh, under-the-hood applications also support demand. These hoses are typically designed for increased abrasion resistance and consistent long lengths to reduce leak points.
Another common material is thermoplastic, which offers a wide variety of added value over rubber counterparts. Thermoplastic hose can be thermoformed into custom shapes to meet customer application requirements. This allows for easier routing and less scrap. Additionally, thermoplastic hose is typically 20% smaller than comparable rubber hose in outer diameter, making it ideal for use on equipment where space is limited.
the method of prolonging the service life of large diameter rubber hose
During production, hose material goes through a variety of tests. These tests include absorption testing, abrasion testing, and accelerated life testing.
These tests determine the extent to which the hose deteriorates under service conditions. Besides, they help the hose manufacturer to develop and design improved products.
These test results can also be used to determine the best hose materials for each application. It is important to consider hose material compatibility with the fluid to be conveyed, taking into account its concentration and temperature.
Using hoses that are not compatible with the fluid to be conveyed will greatly shorten their service life. Hose manufacturers offer material compatibility charts to help avoid this.
Some hoses have special designs for improved flexibility. These include convoluted hoses, which incorporate layers of tape to form helical ridges and grooves.
Another method of enhancing the flexibility of a hose is vulcanization, which is a chemical process that extends the elastic properties of rubber compounds over a wide range of temperatures.
During storage, large diameter hose should be stored in subdued light and in a controlled environment. Per SAE specifications, bulk rubber hose has a shelf life of 40 quarters (10 years) from the date of manufacture and thermoplastic hose has an unlimited shelf life.
large-diameter rubber hose steel wire layer fault
The steel wire layer fault is an important cause of hose failure. During the production process, it is necessary to select the correct core and outer casing, and control the amount of buckling and system pressure in the assembly. The correct size and amount of buckling can effectively weaken the bending and twisting stress of the rubber hose and make the hose more durable.
There are many factors that can impact the service life of large-diameter rubber hoses. Poor routing of hoses around tight corners can put extra strain on the hose. This can cause leaking crimps or bursts at the stress point.
External damage to the hose cover or carcass is another reason for hose failure. Cover damage, kinks, and crushed sections will eventually expose the reinforcing wire to abrasion.
Generally, a large-diameter rubber hose should have at least three types of joint cores and outer caps: (1) Anti-pull-out structure joint core; (2) Rectangular structure joint core; (3) Inner locking structure joint core. Compared with the anti-pull-out structure joint core, the rectangular structure joint core has a higher strength. This type of joint core is suitable for resin hose, steel wire wound hose and other types of hoses.
