Oxygen sleeve: description, GOST, types and diameter
Oxygen hose - flexible type hose, forproduction of which uses such material as a cord. As an additional material protecting this thread, rubber compounds are used, which are applied to the sleeve from all sides.
This product is irreplaceable in the event that,if it is necessary to carry out welding, especially if it is also meant to transport gas for welding from one place to another. It is worth noting that the profile of the application of the oxygen sleeve is rather narrow, but at the same time it is this rubber product that has been most widely used among others. It is this type of hose that is considered the most popular among all other devices, the purpose of which is the transportation of gaseous matter on an industrial scale.
Most often in production processesOxygen sleeves are used when it is necessary to deliver a gas such as acetylene or propane, oxygen or atmospheric air. Transportation is most often carried out from a cylinder with the right substance or from the mainline, to the point where welding is being carried out. Without the use of this hose, it would be impossible to imagine the operation of welding machines. Another area of use of oxygen sleeves is the production of medical equipment or special suits, which require the supply of oxygen from the balloon to the mask. Vivid examples are suits for divers, cosmonauts. The design of this hose is quite simple. It has an inner rubber layer, after which a frame is created from a cord, cotton fiber, fibers pre-impregnated with a special agent. It is very important that if any defects were noticed before the operation, during the inspection, that led to a violation of the integrity of the product, then it is prohibited to exploit such goods.
At present, there is a separation of the oxygensleeves into three categories. The belonging of a hose to a particular category is determined depending on the purposes for which it can be used.
- The first category of hoses is intended for the transportation of acetylene, butane, propane at a pressure of not more than 0.63 MPa.
- The second category of rubber products includes those hoses that feed gasoline, kerosene or mixtures based on these substances, with a pressure of 0.63 MPa.
- The third category of oxygen hoses are devices for transporting oxygen with a pressure of up to 2 MPa.
It is important to note that the exploitation of any of thesethree categories of sleeves is supposed at a temperature of no more than 70 degrees Celsius. Use standard oxygen sleeves is prohibited if the temperature drops below -35 degrees Celsius. However, there are specialized hoses that have been specially designed for operation in cold edges. The maximum possible operating temperature of such devices is -55 degrees Celsius.
According to the GOST of oxygen sleeves underNo. 9356 establishes the symbol for the hose. This document establishes the rules for marking these devices. Each sleeve must have in its designation a hose class, its diameter, indicated in millimeters, the pressure in MPa and an indication of the climatic performance of the hose. Those rubber products, which are operated only in temperate climatic zones, do not have additional marking. But those oxygen sleeves that can be used in a cold climate, additionally have the label "HL".
Types of hose
Depending on the scope of application of the hoseare painted in different colors. Red hoses have hoses belonging to the first category, that is, used to transport gases with a pressure of 0.63 MPa.
The second category is colored yellow.
The most common is the blue oxygen 9 mm sleeve.
GOST 9356 also regulates the painting of the hose inblack color. But if the external execution goes of this color, then on the sleeve there must be two strips, executed in that color, to the class of which the device belongs.
Quality control of finished productsis carried out through visual inspection. A product that does not have cracks, bubbles or folds on its internal rubber side, is considered to be of high quality, and there are no bubbles, detachments on the outer rubber side, and there are no exposed places, that is, without a power frame. The quality of the product that was produced is compared with the control sample. At the manufacturing plant, acceptance is carried out in batches. A batch is considered to be the length of an oxygen hose of one class, not exceeding 2000 m. In addition to visual quality control, the hose also undergoes a leak test under hydraulic pressure, a tensile strength test, and also the resistance of the outer layer to aggressive gasoline attack. This stage of verification is carried out only for those products that will belong to the second category.
Basic parameters according to GOST
This document establishes all the rulesmanufacturing and subsequent storage, labeling and transportation of oxygen sleeves. The GOST lists all the main parameters for these devices. For example, a hose with a working pressure of 0.63 MPa (6.3 kgf / cm2) should have a nominal diameter of the inner part of 6.3 mm, and an outer diameter of 13 mm. If we talk about products designed to transport oxygen, that is, at a pressure of 2 MPa (20.0 kgf / cm2)2), then the inner diameter of the oxygen sleeve is 8 mm, and the outer diameter is 16 mm. It is also worth noting that GOST regulates the production of hoses, designed for a pressure of 4 MPa (40.0 kgf / cm2). With this indicator, the inner diameter of the hose is 6.3 mm, but the outer diameter reaches 16 mm.
It should be noted that when manufacturing hoses, it is necessary to coordinate the length of the lot directly with its customer.
GOST 9356 also establishes substances fromwhich can produce oxygen sleeves. This includes those materials that were mentioned earlier, such as the inner rubber layer, the power cage from the cord thread, etc. Color and distribution by category are also carried out in accordance with the rules of GOST. All hoses that are allowed to operate must be completely sealed under the influence of hydraulic pressure. Another important point is that each sleeve must have a minimum three-fold safety margin when the hydraulic pressure breaks. The ends of these products must withstand stretching without breaking in the radial direction. This is important, since this pressure is greatly increased when the sleeve is attached to the corresponding nipple. The price of an oxygen sleeve is 50 to 75 rubles per 1 meter of product.