Full definition
Hydraulic tubing is a crucial component in hydraulic systems, designed specifically for the transportation of pressurized hydraulic fluids, typically oil, within fixed installations. These tubes are manufactured from seamless steel, which provides superior strength and durability, essential for withstanding high pressures and ensuring reliable performance. The main standards governing hydraulic tubing include DIN 2391, which specifies precision tubes with H8 tolerances, SAE J524 for steel hydraulic tubing, and EN 10305-4 for non-alloy steel tubes. These standards ensure that the tubes meet specific requirements for dimensional accuracy, mechanical properties, and performance under pressure.
The materials used in hydraulic tubing primarily include E215 (ST 37.4) and E355 (ST 52.4) steels, with the former suitable for applications up to 250 bar and the latter for higher pressure applications reaching up to 500 bar. The outer diameter (OD) of hydraulic tubing typically ranges from 6 mm to 76 mm, allowing for a variety of applications depending on the required flow rates and pressure conditions. The selection of the appropriate tube size and material is critical, as it affects not only the performance but also the safety of the hydraulic installation.
Connections for hydraulic tubing are often made using bite-type fittings, such as the Parker EO/EO-2 (DIN 2353) or Swagelok compression fittings, which provide a secure and leak-free joint. When installing hydraulic tubing, it is essential to conduct a pressure test that is 1.5 times the working pressure to ensure that the system can handle the operational demands without leakage or failure. This testing process is crucial for maintaining system integrity and safety, especially in high-pressure hydraulic applications.