According to the Society of Automotive Engineers (SAE), the shelf life of bulk rubber hose is 10 years from the date of manufacture. Look for the manufacturing date of the hose on its lay-line and if the hose is close to 10 years old, don't use it.
Purchasing a new hose assembly is usually many times less expensive than the cost of clean up after the old hose breaks, not to mention the potential damage to different (expensive) components of your system, down time and the potential for injury.
For most applications, a simple visual inspection once a month and preventive replacement of hoses every year or two is adequate. 80% of hose failures are attributable to external physical damage through pulling, kinking, crushing or abrasion of the hose and all the external damage can typically be checked for.
Keep a log of the hose replacements - especially replacements necessitated by a hose failure. You can use this log to estimate how long your hoses last in your application. You should only use this information for budgeting purposes and never as a substitute for regular visual inspection.
Inspect/replace critical hydraulic hose assemblies more often. Critical hose assemblies may be those that are close to the equipment operators or whose failure could result in injury or would cost a great amount of damage.
IMPORTANT! When inspecting the equipment, never touch pressurized hoses with your hands, not even with gloved hands. If you are looking for a pinhole leak, use a piece of cardboard or wood to locate it, NEVER run your hand over the hose to find it. Hydraulic oil injection injuries are very serious and can result in amputation or even death. Read our related blog on hydraulic oil injection injuries (warning - pictures are graphic).
Posted by Marek Bobik