The hose is reinforced. Construction. Classification. Parameters and markings. Operation
Rubber hose, spiral-reinforced is a flexible pipe. Its construction of several rubber tubes is strengthened by winding or winding synthetic threads or special textiles, or metal wire. The flexible and strong sleeve is used for the purpose of transportation of various working environments, as liquids of different consistency, and gaseous, under high pressure.
Reinforced hoses of various types are used to transport liquids and gases under pressure, and without him
Reinforced rubber hose design
The rubber reinforced hose consists of the following elements:
- inner rubber layer, which provides sealing;
- power frame - braid of metal wire, textiles or synthetics;
- outer rubber layer.
The extrusion method is used to perform the inner and outer layers (extrusion). The sleeve is made, using fluoroplastic, polyethylene film and polyamide. Combining these polymeric materials and combining them with various special additives, seek to increase the stability of the product:
- to temperature effects;
- to mechanical and physical loads;
- to the influence of aggressive work environments.
Winding or winding, make the sleeve quite stiff, produced on special equipment. Combination of inner and outer layers of rubber with braid, which can be performed in one or more layers, allows design, maintaining sufficient flexibility, be very strong and withstand the high pressure of the working environment.
Reinforced hose is a multilayer structure, inside which is a metal wire, which gives strength
pay attention! Sleeve, the ends of which are equipped with fittings, sealed at the junction with special sleeves and cuffs.
Sleeve, depending on its purpose, is equipped with a tip with a profile view, appropriate to certain equipment.
Classification of high pressure reinforced hoses
Rubber hose, reinforced with a spiral, can have a braid or winding design. High pressure hoses of braiding type are intended for transportation of technical liquids, water-based emulsions and mineral oils, whose temperature is in the range from -42? From to 75? WITH (for emulsions and oils) and 101? WITH (for liquids). Three types of sleeves can withstand different tensile forces:
- And - from 14,7 kgf
- B - from 17,5.
- V (WITH) - more 20 kgf. They have high strength, brass wire is used for production.
There are also three types of operating pressure:
- I - braid in one layer withstands up to 160 atm.
- II - two-layer - to 200 atm.
- III - three-layer - to 330 atm.
According to international markings:
- SN - the outer layer formed by rubber of fine structure;
- ST - brass wire is used in the braid.
Reinforcement of hoses can be made in the form of a spiral or braid
The sleeve with a braid of a winding type can count on various pressure of working liquid:
- 4 SP - four layers of steel wire - for medium pressure.
- 4 RS - four layers of particularly strong spiral - for high.
- R 12 - will sustain long operation in the conditions of the raised temperature and average pressure.
- R 13 R 15 - winding in six layers - for elevated temperatures and pressures.
Parameters and marking of reinforced sleeves
For high pressure hoses with one or two layers of braid, the working pressure can be up to 250 there is. According to the DIN standard, they are classified as EN853. With a braid thickness of four or six layers, the working pressure can reach 455 there is. The DIN standard for them is EN856.
The optimal temperature range of technical fluid for RVT is the interval from -40? From to +100? WITH. The products have a significant margin of safety, keeping and lowering the minimum temperature on 15 degrees, and increase the maximum - to + 155? WITH.
pay attention! The allowable bending radius is measured by the internal arc. Flattening the hose at the same time, measured with a special sliding calibrator, will not exceed one tenth of the original value of the outer diameter.
By marking on the outer surface of the product it is easy to determine its purpose and technical parameters
The labeling of high pressure hoses contains information on key parameters:
- bending radius;
- inner diameter;
- dimensions of connecting threads;
- the size of the key;
- working fluid pressure.
The extended technical designation contains more than ten parameters. Embossing is applied to the outer surface of the hose. It may include a notation, determines the climatic conditions of use:
- In - moderate;
- HL - cold;
- T - tropics.
Use of reinforced hoses
Reinforced hoses, strong and flexible, steadily resist high pressure and aggressive environments, temperature differences are used in various fields of activity:
- ventilation systems;
- water supply and sewerage;
- woodworking;
- transportation of petroleum products;
- mechanical engineering;
- agriculture (for liquids and pneumatic transport);
- food industry;
- waste transportation, sludge and chemical products.
Such hoses can be found in various areas of construction, industry and economy, in everyday life they are most often used for watering
Virtually every complex technical device or unit does not do without these useful devices. They are unpretentious, inexpensive and reliable.
Features of operation of high pressure hoses
Sleeves are created with a considerable margin of safety, but cases of their failure occur. Usually, breakage of hoses occurs due to neglect of the rules of operation or incorrect choice of product. Of particular importance is the compatibility of all elements of equipment with the working environment, and not just the inner layer, contacts her directly. Damage, caused by the aggressive nature of the environment, arise, usually, on end connections.
On a side note! The operation of the sleeve must be at the optimum temperature, recommended by the manufacturer. Otherwise, the fitting connections will fail prematurely and the elastomer condition will deteriorate..
Proper selection of the inner diameter of the hoses is important. When installing a sleeve with a smaller diameter, compared to the recommended, there is a phenomenon of turbulence. As a result, the internal working pressure and temperature rise sharply, which reduces the service life of the equipment.
Hydraulic hoses can be selected exactly along the length:
- reducing it with increasing pressure;
- vibration during operation;
- allowed during installation twisting and sagging.
Therefore it is recommended not to allow tension of hoses, taking into account the allowable bending radius. The condition of the outer layer of the sleeves also needs attention, prone to wear.
Proper selection of hoses and compliance with operating conditions will allow you to use the equipment for a long time without significant damage.
