When an operation relies on hydraulic hose, evaluating it for potential abrasion is paramount. Industry and user experience agree 70% of failures are a direct result of abrasion or external damage—yet many could be prevented. Since hose is critical to performance and other operational metrics, hose design and accessories that protect it become critical. Often this makes one wonder which hose cover or accessory is the best. And, as is often the case with so many variables in an operation, the answer is “it depends.” While some standards, such as ISO 6945, can be poor indicators because of variability, human judgment and field experience seem to be better guides. Let’s walk through the options:
Sleeves can supplement the cover and be placed along the length and circumference of the hose. These range from spring coils to woven fabric (typically nylon) to corrugated plastics, with many designed with resistance to chemicals, ultraviolet rays, and ozone attack. The selection criteria will vary by need. A coiled spring-like wire provides protection to blunt-force impacts but is prone to snagging. A woven nylon sleeve can be very abrasion resistant as with a textile hose cover but will be prone to bunching and snagging. These sleeves can have the added capability to resist pinhole sprays of high-pressure fluid.
So while the question of which cover or accessory is best is answered by “it depends,” if the user combines good judgment and practical field experience, effective selections can be made to create a balance in hydraulic flow and abrasion performance.
by Eaton Corp., (www.eaton.com)