Durite hose is an excellent alternative to rigid pipes and is widely used in many areas of human activity. The high performance of the sleeve is due to the design features, the distinctive feature of which is the multi-layer and carcass base.
What it is?
Durite sleeve is a rubber-fabric hose that combines high strength with good flexibility and elasticity. For its manufacture, a multilayer rubberized textile is used, covered on both sides with an extra strong thick rubber. In addition to the fabric base, thin copper or steel wire is used to make the reinforced layer. Due to its reliable construction, the hose was named "durit", which means "strong" in Latin (durus).
Each of its layers contains mineral inclusions, the size of which does not exceed 0.3 mm. The same value is the maximum permissible for various kinds of roughness present on the inner surface of the product. The result of the multilayer design is the hose's ability to maintain its internal cross-section unchanged even when severely kinked or bent.
Due to these properties, Durite models are widely used in industry and everyday life and in many respects are significantly superior to other types of hoses.
Scope of application
The area of use of durit sleeves is quite extensive. Due to the wide temperature range, ranging from -55 to 130 degrees, the models are successfully used not only in construction, industry, everyday life, but also in the military sphere. They have also found their way into the aviation industry, where they are used as flexible lines for the supply of oils and fuels.
The products are distinguished by good chemical resistance and do not lose their performance properties for a long time under the influence of many synthetic substances. This makes it possible to use durite for the transportation of many types of gaseous and liquid substances, supplied also under high pressure. In addition, hoses are widely used in all types of hydraulic systems, from household appliances to high-power industrial installations.
Advantages and disadvantages
The high consumer demand for durit sleeves is due to a number of important advantages. The main advantage of the models is their high strength combined with excellent elasticity. This allows the sleeve to be bent at any angle without fear of reducing the internal clearance, and makes it possible to compete with corrugated hoses.
The second important advantage of durite hoses is the ability to use them for pumping liquids and gases under pressure up to 13 atmospheres, which allows them to be used in machine-tool construction and various areas of heavy engineering. Another important advantage of the sleeves is their resistance to ethers, alkalis and weak acids. This greatly increases the scope of their application and allows their use in the chemical and oil refining industries. The advantages also include a wide range of standard sizes: the length of the sleeves varies from 0.5 to 20 m, the inner diameter - from 6 to 125 mm.
The disadvantages of durit hoses include too much weight. This is due to the multi-layer of products using heavy thick rubber for their manufacture, and often also a metal reinforcing frame. In addition, the service life of Durite models is not very long and is often limited to ten years. This is due to the fact that under the influence of chemical substances, rubber begins to deteriorate over time, and constant jumps in the temperature of the supplied liquid often provoke rotting of the inner layer. The disadvantages include the need to comply with special storage conditions for sleeves.
A certain humidity regime must be maintained in the room and, if possible, access to sunlight should be limited, otherwise the rubber sheath will dry out and crack.
Durite hoses are manufactured in accordance with GOST 10362-76 and TU 0056016-87. The state standard defines all possible standard sizes and the corresponding indicators of the maximum allowable pressure. So, the most common sizes of sections 10, 12, 18, 25, 32 and 50 mm can be operated under pressure of 3, 5, 7 and 13 atmospheres each, and the model with a diameter of 60 mm is designed for 3 and 7 atmospheres. The frost resistance of hoses is also regulated, many of which are capable of operating at temperatures up to -50 degrees, however, according to the tests carried out, they can withstand well -60.
Each type of transported liquid or gas has its own standards prescribed by GOST and TU. So, pumping diesel fuel through durite hoses can be performed at temperatures from -55 to 70 degrees. For AMG-10 and MS-20 oils, this indicator lies in the range of -55-100 degrees, and for oils of brands M-16P, M-16 IHP, MT-8P, as well as for antifreeze "40" and "65", the upper temperature the limit increases to 120 degrees. Gasoline and air can be pumped at temperatures from -66 to 60 degrees, and drinking water and MK22 brand oil - from -55 to 130 degrees.
The design of durites is also regulated by GOST and provides for the presence of 2-6 inner layers of fabric , as well as inner and outer rubber layers with a thickness of at least 1.5 mm. A distinctive feature of durit hoses is the presence of a yellow continuous marking applied along the entire length of the hose. This makes it possible at a glance to determine which hose belongs to the group of durits and greatly facilitates the selection.
Despite the fact that dyurite models have high elasticity, when operating in especially difficult conditions, manufacturers recommend equipping them with an additional spring or protective shell, which significantly increases their service life.
Criterias of choice
When choosing durite hoses, a number of important technical points must be taken into account.
- Each hose must have a mark indicating the maximum allowable pressure at which the hose can be used. Therefore, when choosing it, it is necessary to compare the capabilities of the pumping equipment and the purchased product.
- It is also necessary to take into account the maximum permissible temperatures for which this or that model is designed. It often happens that a product is adapted to work at high pressure, but is not capable of operating at too high a temperature.
- It is necessary to take into account the composition of working fluids, remembering that rubber products are not intended for pumping highly concentrated acids and caustic compounds.
- It is also necessary to inspect the appearance of the sleeves. Products should not have visible damage, defects and cracks, otherwise it is better to refuse to purchase them.
- Before purchasing durites, it is recommended to select its length as accurately as possible and not to allow excessive sagging or excessive tension of the hose during operation.
Operation and storage
For correct and long-term operation of durite hoses , a number of simple recommendations must be followed.
- When installing the sleeve, you must focus on a special line that will help prevent twisting.
- Avoid kinking the hose, as well as the formation of sharp loops and kinks during operation.
- The ends of the hose are connected to the fittings at smooth angles, otherwise the hose will begin to bend strongly and quickly fail.
- When the product comes into contact with the heating elements of the mechanism, it is necessary to ensure its thermal insulation.
- Durite models should be stored in a ventilated room at an air temperature of 15–20 degrees and a humidity of at least 45%. It is strictly forbidden to heap bays on top of each other. This can lead to pinching of the hose by the body of the adjacent reel, and in the future will lead to the loss of its tightness.
A competent choice and adherence to the rules of storage and operation of durite hoses can ensure their trouble-free operation throughout the entire service life declared by the manufacturer.
For information on how to repair a high pressure hose with your own hands, see the video below.