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Flexible Hose Help Maintenance

Dongyang Exploit Trade Co.,Ltd | Updated: Oct 24, 2017

1 determine the appropriate bending radius

Although many Flexible Hose manufacturers are currently able to provide Flexible Hoses that can be bent to a smaller radius than the promulgated industrial standard, the bending curvature of the Flexible Hose should be avoided less than the recommended minimum radius, so as to avoid shortening the service life. Therefore, the cloth tube must first provide sufficient bending radius. The bending radius of the Flexible Hose after installation shall not be less than the $number times of the outer diameter of the Flexible Hose, Flexible Hose ends of the joint of the root is not allowed to bend, should retain a certain straight line section, its length is not less than 6 times times the diameter of the Flexible Hose: to avoid sharp bending, can be taken outside the Flexible Hose around the spring or supporting the steel belt and other methods to make it bend gently.

2 correctly determine the length of the Flexible Hose

Because the Flexible Hose is flexible, it is important to consider its scalability when determining the length of the Flexible Hose. According to the type of Flexible Hose, the Flexible Hose can be extended by 2% when the pressure changes, and can be shortened by 4%. This change in length can cause fatigue of the steel wire layer of the Flexible Hose, especially at the interface where the Flexible Hose is connected. Therefore, take into account the shrinkage of the Flexible Hose, the cut should be slightly longer to compensate. If the Flexible Hose length is not enough, two Flexible Hoses can be used to connect the method through the transition joints lengthened.

3 Avoid torsion of Flexible Hose

In the same plane bending of the Flexible Hose, when the 2 parts of the connection between the relative movement, to avoid torsion Flexible Hose, or will reduce the pressure on the Flexible Hose capacity. The test results show that the torsion of the high-pressure Flexible Hose 5° will reduce the service life of 70%, reversing 70 can reduce the service life of 90%. To avoid distortion, you can use chalk on the Flexible Hose to draw a line parallel to the center line to make it easy to check if the Flexible Hose is screwed.

4 The treatment method of the flexible Flexible Hose in the multi-plane bending

Flexible Hose layouts are usually carried out later in the design process, so finding the ideal path is difficult. Multi-plane bending can often be avoided by redirecting the Flexible Hose. If this does not work, then 1 Flexible Hose clamps should be installed between the 2 bends to provide sufficient length on both sides of the Flexible Hose clamp to release the tension of the Flexible Hose steel layer. This length depends on the quality of the Flexible Hose, the degree of bending and the wire layer of the Flexible Hose, so it must be designed separately for different objects.

Another option is to use a separate Flexible Hose for bending within each plane, with 1 Flexible Hose fittings and Flexible Hose clamps installed between 2 bends. However, because this method is not only expensive, long installation time, but also in the Flexible Hose joints to increase the potential for leakage. So use less.

5) providing protection

Flexible Hose manufacturers now provide a variety of wear-resistant shell products. The analysis shows that about 80% of the Flexible Hose failure is due to external physical damage, wear has been proved to be the main reason. The main wear is the Flexible Hose repeatedly and equipment surface or Flexible Hose friction between each other. In order to avoid abrasion, the Flexible Hose should be fastened with a clamp to prevent friction with the adjoining surface. The tightness of the clamp should be appropriate to avoid the Flexible Hose movement, but if too tight it will compress the damage Flexible Hose. Flexible Hoses on both sides of the clamp should be left with appropriate allowances to compensate for the expansion of the Flexible Hose. Further protection can be provided by the casing, and a spring-like metal casing protection Flexible Hose is free from being squeezed. Soft casing can make Flexible Hose not wear, some types of casing must be from the Flexible Hose not connected to the end of the Flexible Hose sliding installation. The sleeve with openings along the length direction is installed without disconnecting the ends of the Flexible Hose. These 2 types of casing can be bundled together with multiple Flexible Hoses. Should try to avoid the Flexible Hose and machine contact and friction, to prevent the outer layer and steel wire braid wear. In a section where mechanical friction may occur with the outside world, cover the canvas belt or rubber Flexible Hose to protect it.

6) Adaptive Movement

In addition to torsion and wear, the Flexible Hose is not properly adapted to the movement of the working device. It will also damage it quickly. For example, when connected to a movable hydraulic cylinder. The length and arrangement of the Flexible Hose must be appropriate to avoid entanglement or bending over the recommended minimum radius. When multiple lengths of Flexible Hose are arranged close together. And one of the parts will be linear motion, then the Flexible Hose conveyor should be used to keep the Flexible Hose neat, to avoid entanglement, twisting and friction with each other. Some special types of Flexible Hose conveyors can also isolate external conditions such as falling objects, friction, chemicals, or high temperatures.

7 Other issues to consider

Most Flexible Hoses are reinforced with steel wire, which makes the Flexible Hose a conductor because the machine may be used next to the power line or the Flexible Hose is very close to the combustible solution that can be ignited by electrostatic discharge. So manufacturers can provide non-conductive Flexible Hose. Electrostatic discharge may sometimes pass through the tube wall to the periphery. The result is a localized combustion, which makes the Flexible Hose wall thinner and even produces pinholes on the tube wall. In this case, the Flexible Hose with conductivity needs to be designed to pass through the Flexible Hose end of the fittings rather than through the Flexible Hose discharge.

High temperature and torsion can shorten the Flexible Hose life gradually. External heat sources, such as the exhaust pipe on the engineering machinery, can quickly soften the Flexible Hose from outside the tube wall. Therefore, it is important to keep the Flexible Hose away from the external heat source. If you can't get away. A protective casing shall be used to isolate the heat transmitted to the Flexible Hose.

The heat source from the oil itself can also reduce the life of the Flexible Hose. The system's oil temperature only exceeds the maximum allowable temperature of the Flexible Hose by about 10 ℃, which can reduce the life expectancy of the Flexible Hose by 1/2. What makes this problem even more serious is that mechanical operators often do not know that the oil temperature may exceed the recommended value of the Flexible Hose manufacturer, especially when the heat occurs intermittently.

Flexible Hose layout should be as neat as possible, this can not only avoid the Flexible Hose tangle, twist, friction, and help the system maintenance. Use the transition connectors carefully because they increase the number of parts in one assembly, which increases the time, cost, and potential leakage points of the assembly. However, the Flexible Hose assembly can be simplified if applied properly at both ends of the Flexible Hose using a elbow transition joint such as a 90° joint. In these assemblies, the pipe end connector must pay attention to the installation direction in order to avoid twisting the Flexible Hose during installation.