Chemical equipment pipelines usually transport a variety of corrosive fluids, the need for frequent use of solvents or water flushing. Therefore, the general chemical piping must be stainless steel hydraulic fittings.
Ordinary hydraulic oil on the steel pipe and steel fittings has no corrosive, so the common use of carbon steel fittings in the hydraulic system, potable water or pure water connected to the pipeline should not be used ordinary carbon steel, the former air tightening rules using brass tubes, due to the tightening of the air will carry moisture, collected in the tube, if the carbon steel pipe will corrode the pipeline. Advanced air-tightening machinery has not produced moisture, so this rule has lost its significance.
Selection of pipe joints, The request for each joint of the large working pressure is equal to the working state of the entire hydraulic system is set to work in the large working pressure, not only think about the pump outlet pressure, but also think about the relief valve start pressure. Therefore, in the design of complex hydraulic piping, the actual pressure is good to use the field measurement method. System working pressure has been set, let after checking the big working pressure of each selected pipe joint.