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How to extend the service life of high-pressure rubber hoses



The service life of a hydraulic hose assembly depends on its usage conditions. In order to extend the service life of high-pressure hoses, the hose assembly in use should be regularly checked for leaks, kinks, blistering of the outer layer, scratches, wear, or other damage. After discovering damage or wear to the assembly, it must be replaced immediately. The service life of the assembly can be extended by the following measures:

1 Usage factors:
 
Installation of hose assembly: The installation of hydraulic hose assembly should comply with the relevant standards of SAEJ1273 on the direction and arrangement of hydraulic hoses to ensure the correct use of the hose assembly.
Working pressure: The hydraulic system pressure should not exceed the rated working pressure of the hose. Pressure surges or peaks exceeding the rated working pressure are highly destructive and must be considered when selecting hoses.
Minimum burst pressure: The burst pressure referred to in this product catalog is limited to destructive testing to determine the design safety factor.
Temperature range: Do not use hoses under temperature conditions that exceed the recommended limits (including internal and external temperatures). If the hydraulic fluid used contains emulsions or solutions, please refer to the relevant technical data separately. Regardless of the temperature range of the hose, it must not exceed the maximum recommended operating temperature by the fluid manufacturer.
Fluid compatibility: The hydraulic hose assembly (inner layer, outer layer, reinforcement layer, and hose joints) must be compatible with the fluid being used. Appropriate hoses must be used because the chemical properties of phosphate based and petroleum based hydraulic fluids are completely different. Many hoses are suitable for one or more fluids, but not for all fluid types.
Minimum bending radius: The hose should not be bent to a radius smaller than the recommended minimum bending radius, nor should it be subjected to tension or torque. This may cause excessive stress on the reinforcement layer, greatly reducing the hose's ability to withstand pressure.
Hose size: The size (inner diameter) of the hose must be able to handle the required flow rate. At a specific flow rate, if the inner diameter is too small, it can cause excessive fluid pressure and generate heat, resulting in damage to the inner rubber layer.
Flexible hose routing arrangement: The flexible hose should be restrained, protected, or guided (using clamps if necessary) to minimize the risk of damage caused by excessive bending, shaking, or contact with moving parts or corrosive substances. Determine the appropriate length and joint form of the hose to prevent wear, avoid contact with sharp objects, and prevent distortion, in order to achieve a leak proof connection..
Flexible hose length: When determining the correct length of a flexible hose, consideration should be given to changes in length under pressure, machine vibration and motion, as well as when routing the hose assembly.
Flexible hose application: Select appropriate hoses based on specific applications

2 Environmental factors:



The storage environment, along with rubber materials, can change the storage life of hoses, and the specific service life is difficult to quantify because there are many factors that affect hoses. If stored properly, the storage life can reach 3-5 years. Beyond this time, the service life of the hose will be greatly reduced, depending on various factors in the storage environment, including:
Temperature: Hoses should be stored in a cool and dry place, and the temperature must not exceed+100 F (+38 C). If stored at temperatures below freezing point, preheating may be necessary before processing, testing, and putting into use after removal.
Direct sunlight, rainwater, heaters, or near electrical equipment.
Moisture and ozone
Oil, solvents, corrosive materials or smoke.
Insects or rodents.
Radioactivity.
Available space and presence of bends.

3 Storage factors
 
Hoses should be stored in their original containers. Don't pile it too high, otherwise its own weight will crush the bottom hose.
It is recommended to visually inspect and test hoses that have been stored for a long time before use. Hoses judged to be in poor condition should be replaced to avoid failure, property damage, or personal injury. The warehouse should be managed according to the principle of first in, first out. Long storage time and poor environment can cause a decrease in hose grade, performance, and may lead to premature failure.



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