What's the hydraulic pipe joint material?
The hydraulic oil of steel pipe and steel joint is not corrosive, so the hydraulic system is widely used in carbon steel joint, drinking water or pure water pipeline connection should not use ordinary carbon steel, before tightening air rules with brass, because the compressed air will carry water, gathered in the tube, if carbon steel will corrode the pipeline. The advanced air tightening machines do not produce moisture, so the rule is meaningless
Selection of pipe joints, the minimum is equal to the entire hydraulic system working state of the maximum working pressure setting the maximum working pressure for each joint, not only to consider the pump outlet pressure, also consider starting pressure relief valve. Therefore, in the design of complex hydraulic pipeline, the actual pressure is best measured by field measurements. The system operating pressure has been fixed, so the maximum working pressure of each selected pipe joint shall be checked.The maximum working pressure of the pipe joint can be changed by different sealing methods or according to the change of temperature: similarly, if the pipe joint chooses the elastic seal, it will get higher working pressure than the rigid seal.International standard set 4 times insurance coefficient, the reason is the practice of design thinking, the error of pipe joint device and equipment operation process may appear, the working condition of the system stability, in order to guarantee the system not paralyzed when in operation, so the insurance coefficient of the nominal pressure of the high.
Chemical equipment piping usually walks a variety of corrosive fluids, the need for frequent use of solvent or water rinse. Therefore, the general chemical line must be stainless steel.While thinking about medium corrosion. We should consider the relation between pipe seal and medium. Ding Qing rubber is commonly used in hydraulic systems because it is miscible with ordinary hydraulic oils. Ding Qing rubber at a certain temperature, but also with the synthesis of acetaldehyde, sugar chemical liquid (HEPG) and the proposed plant in liquid and compatibility, nitrile rubber (NBR) is not suitable under high temperature and acidic medium, benzene or synthetic oil, then should use fluorine rubber (FKM), on the contrary, methane and refrigeration only with ammonia NBR (NBR) miscible, so most chemical stainless steel pipeline are rigid seal.
