How To Choose Hydraulic Hose For High Temperature Hydraulic Systems

High temperature is one major factor accelerating hydraulic hose aging. When the fluid temperature or ambient temperature exceeds the hose's maximum rated temperature, the inner rubber tube will harden, crack and lose elasticity. Even if the working pressure stays within the specification, continuous over-temperature operation will greatly shorten hose service life.

The inner tube material is the core consideration for high-temperature hose selection. Nitrile rubber (NBR) is widely used for standard hydraulic oil within normal temperature range. For sustained high-temperature oil, hoses with special inner tube materials like fluoropolymer are required. The outer cover also needs heat-resistant properties to resist thermal aging and ozone damage under hot surroundings.

System design and maintenance can reduce heat damage. Keep hoses away from heat sources such as engine manifolds and exhaust pipes. Use heat shields or thermal sleeves when close contact cannot be avoided. Check the hydraulic oil temperature regularly and fix overheating faults of pumps or coolers in time.

During daily inspection, watch for typical high-temperature damage signs: hardened, brittle outer rubber, surface cracking and discoloration. Once these symptoms appear, replace the hose immediately instead of waiting for leakage or burst.

Never rely on visual judgment to select high-temperature hydraulic hoses. Always match hose temperature rating with both fluid temperature and surrounding environment temperature. Heat-resistant hydraulic hoses are a necessary investment for long-term stable operation of high-temperature hydraulic equipment.