EPDM is a great material for flexible hose
Routine Maintenance Of Hydraulic Hoses
There are many reasons why hydraulic hoses can fail, but with proper precautions, some of the most common failures can be avoided.
1. Fluid compatibility
Incompatible fluids will cause deterioration, swelling and delamination of the inner rubber layer of the hydraulic hose assembly. In some cases, the inner rubber layer may also be partially damaged. The hose must be compatible with the fluid being transferred. Make sure that the fluid is compatible not only with the inner rubber layer, but also with the outer rubber layer, joints, and even O-rings.
2. Dry air / stale air
The inner rubber layer of the hydraulic hose may cause many tiny cracks due to old or dry air. Sometimes this type of failure is difficult to detect because the hydraulic hose can still remain flexible, but there are signs of external leakage. To avoid dry or stale air problems, you should confirm that your hose rating is suitable for extremely dry air. For these applications, it is best to choose hydraulic hoses with PKR or EPDM inner rubber materials.
3. Minimum bending radius
If the minimum bending radius is not met, the hydraulic 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 bending is too severe, the hydraulic hose may become kinked. To prevent failure of the minimum bend radius hose, the recommended bend radius should be carefully checked.
4. Friction damage
Hydraulic hoses are subject to harsh environments every day, and their effects will eventually manifest themselves on the hose. If not inspected regularly, wear may cause the hose assembly to rupture and leak. Excessive friction between the hose and an external object or even another hose will wear off the coating on the hose and eventually wear the reinforcement.
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