What are the requirements for large-diameter high-pressure rubber hoses

1. According to the system pressure, select the number of steel wire layers for the hose. The higher the pressure, the more steel wire layers there will be. Each hose has a maximum working pressure, and the burst pressure of the hose is four times the maximum working pressure. Therefore, based on the actual system pressure, the maximum working pressure of the selected hose should be higher than the actual working pressure.

2. According to the flow rate selection, if the pipe diameter is too small, it will increase the flow rate of the medium inside the pipe, causing the system to heat up, reduce efficiency, and generate excessive pressure drop, which will affect the performance of the entire system When fixing hoses with clamps or threading hoses through gaskets such as steel plates, attention should also be paid to the outer diameter of the hoses.

Classification, application and materials of large-diameter rubber hoses

Characteristics of PVC large-diameter pipe products: good flexibility, high temperature resistance, not easy to break and age. Expansion socket, connected with high-temperature rubber ring for sealing and waterproofing, adaptable to thermal expansion and contraction, without the need for pouring concrete or protective layer on the construction site. Lightweight, easy to construct, low construction cost, greatly shortening the construction period. Avoiding contact between construction personnel and asbestos that poses a carcinogenic risk.

Large diameter metal hoses are made of white steel material. For example, for pipeline compensators, the material should be selected according to design requirements or the corrosiveness and temperature of the medium. Generally, stainless steel materials such as 321, 304, 316, 316L are used

What are the uses of high-pressure rubber hoses?

coal industry

The oil pipes used in the coal industry mainly include hydraulic support rubber hoses. In recent years, the pressure requirements for hydraulic supports in some coal mines have increased, and some steel wire braided rubber hoses cannot meet their performance requirements, requiring the use of steel wire wrapped oil pipes instead. In addition, in order to prevent coal dust pollution during underground coal mining and improve production safety, the variety of oil pipes used in coal mines has been increased, such as the expansion oil pipe of the coal seam water probe hole sealer, which is used for water injection, grouting and other operations on the coal seam before the comprehensive mining of the coal mine underground working face. According to reports, domestic manufacturers have already produced and tested it in more than ten coal mines, which can replace similar imported products.

petroleum industry

Developing offshore and shallow water oil fields, therefore, the petroleum industry requires the use of shallow water oil pipelines in addition to drilling and vibration pipelines. Shallow sea subsea oil pipelines have been produced domestically, but floating or semi floating oil pipelines and deep-sea subsea oil pipelines still rely on imports. With the implementation of China's offshore oil development strategy, the requirements for pipeline performance in offshore oil extraction will continue to increase.

How to choose the appropriate hydraulic hose?

1. Work pressure: It depends on the work pressure and whether the requirements can be met. When choosing, don't demand too much, as long as it is sufficient.

2. Hydraulic hose inner diameter: Ensure that the medium conveyed in the hydraulic hose can be smoothly conveyed without blockage. Choose according to the diameter of the applied product, and cannot be too large or too small;

3. Hydraulic hose outer diameter: Choose according to the diameter of the applied product, not too large or too small, to ensure normal assembly and no leakage;

4. Conveying medium: This is very important and must be noted. When choosing, the corresponding hydraulic hose should be selected. For example, if the conveying medium is hydraulic oil, then it is necessary to choose a hydraulic oil resistant one;

5. Usage environment: Choose the rubber hose according to the usage environment, and check whether the environment is harsh, whether it is outdoors, lighting time, whether it is frequently rubbed, external temperature, etc;

6. Service life: According to the requirements of the product, choose the appropriate service life, taking into account the difficulty and cost of replacing the hydraulic hose during its service life;

7. Length and size: Choose the appropriate length and size according to the size of the product and the specific situation during use, try to make it just right, and do not let it bend excessively or remain in a state of strong tension all the time;

8. Minimum bending radius: Because hydraulic hoses require a small bending radius during use, it is necessary to consider the specific location of the product using the hydraulic hose and determine the appropriate small bending radius, so that the normal use environment of the hydraulic hose does not exceed the small bending radius.

How should hydraulic hoses be installed?

1. Prevent distortion of rubber hoses

Distorted installation of rubber hoses can seriously reduce their characteristics and rear end, and the twisted installation of rubber hoses can cause torque to loosen the connection head (rubber hoses should be twisted straight), which can easily loosen the nut of the connection head, causing water leakage and even rubber hose cracking.

2. Sufficient bending radius is required during installation

A sufficiently large bending radius (i.e. leaving a suitable length) can prevent damage to rubber hoses and throttle valve conditions. A too small bending radius can significantly reduce the service life of rubber hoses and cause insufficient working pressure damage, reducing work efficiency.

3. Adequate space should be left for arbitrary length

When the rubber hose assembly is applied to components with relative speed, because the rubber hose joint is a non deformable part, the rubber hose must have sufficient free space of arbitrary length, otherwise it is very easy to cause contusions, losses, and other offline promotion; When the component operates to a larger or smaller part, the rubber hose joint cannot withstand force deformation.

4. When the hydraulic oil pipeline is complex, using suitable bends and fittings can reduce the usage of rubber hoses, decrease their curvature and distortion, and prevent them from causing additional stress.

5. Should leave room for reduced capacity

Work pressure can cause changes in the length of rubber hoses, with a large variation range of up to -4% to+2%. Therefore, during installation, it is necessary to free up capacity, otherwise long-term use may cause leakage at the joints, and even pull the connector out of the rubber hose.