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Analysis of Causes of Failure of Hydraulic Hose

Sep. 08, 2020

There are many reasons for the failure of hydraulic hoses, but with proper precautions, the most common failures can be avoided. The following are the most common reasons for hose failures summarized by Industrial Hose Suppliers:

1. Corrosion of inner rubber layer

Corrosion of Hydraulic Hoses often leads to external leakage. Corrosion of the inner rubber layer is usually caused by concentrated high-speed fluid, or by fine particles in the fluid.

In order to avoid corrosion of the inner rubber layer, determine the appropriate hose size according to the recommended maximum flow rate. In addition, it should be ensured that the hose assembly does not produce excessively tight bends, and that the fluid medium does not cause excessive abrasion of the inner rubber layer of the hose. During the hose assembly process, it is very important to comply with the maximum bending radius and diameter requirements specified in each hose engineering specification.

2. Fluid compatibility

Incompatible fluids will cause deterioration, swelling and delamination of the inner rubber layer of the hose assembly. In some cases, the inner rubber layer may also be partially destroyed.

The hose must be compatible with the fluid being transferred. Make sure that the fluid is not only compatible with the inner rubber layer, but also with the outer rubber layer, joints and even O-rings.

3. Dry air/stale air

The inner rubber layer of the hose may have many tiny cracks due to old or dry air. Sometimes, this type of failure is difficult to find because the hose can still remain flexible, but there will be signs of external leakage.

To avoid dry or stale air problems, you should verify that your hose rating is suitable for extremely dry air. For these applications, it is best to choose a hose with PKR or EPDM inner rubber material. If possible, the dew point of the air should be increased.

Hydraulic Hoses

Hydraulic Hoses

4. Minimum bending radius

If the minimum bend radius is not met, the hose assembly may fail relatively quickly.

In vacuum or suction applications, if the bending radius is exceeded, the hose may become flat in the bending area. This will hinder or restrict the flow of media. If the bend is too severe, the hose may become kinked. In order to prevent malfunction of the minimum bend radius hose, the recommended bend radius should be carefully checked.

5. Insertion depth

When the hose assembly is not properly crimped, it may cause a very dangerous situation. The connector must be pushed completely onto the hose in order to meet the recommended insertion depth requirements. The grip on the last lap of the connector housing is very important for the strength of the hose.

6. Incorrect assembly

For hydraulic hose assemblies, contamination can cause various problems. When cutting the hose, metal particles and debris may be deposited in the hose if it is not properly flushed. The abrasive left in the hose will contaminate the hydraulic system. In addition, it may also cause small cracks in the inner tube of the hose assembly, which may lead to leakage.

To prevent hose failure due to contamination, the hose must be properly cleaned before being inserted into the joint. Before inserting the joint, the inner tube should be very clean. After the assembly is crimped, make sure to install the end to keep the hose clean and avoid secondary pollution during transportation.

7. Thermal aging

Overheating of the hose assembly can also cause hose failure. Overheating will cause hoses to become very hard, especially High Pressure Hydraulic Hose. The inner hose will harden and begin to crack because the plasticizer in the elastomer will begin to decompose or harden at high temperatures. In some cases, the cover layer may show signs of excessive drying. After the hose assembly is removed, it may retain the shape it was installed in. If it is bent, a cracking sound will be heard.

In order to prevent the hydraulic hose assembly from overheating, it should be confirmed that the rated temperature of the hose meets the temperature requirements of the application. In addition, lowering the ambient temperature or using protective covers and shielding layers will protect the hose from nearby high-temperature areas.

8. Wear

Hydraulic hoses need to go through harsh environments every day, and the effects will eventually show up on the hoses. If the inspection is not performed regularly, wear and tear may cause the hose assembly to rupture and leak. If the hose is rubbed excessively against an external object or even another hose, the coating layer on the hose will be worn away and eventually the strengthening layer will be worn away.

Properly assembled and installed hoses will have a longer life, thereby reducing downtime and maintenance costs

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