What should be paid attention to when choosing pipe diameter in hydraulic system?
How to choose pipe diameter in hydraulic system? The specific situation needs to be analyzed because it depends on whether the pump station is away from the actuator. Whether the speed requirements of the actuator are strict, whether the hydraulic system works continuously or for a long time. The pipe size and wall thickness can be selected according to the maximum working pressure and flow rate of the hydraulic system, and the material of the pipe can be considered.
Want to see material above all, choose rubber tube or steel tube, steel tube is common carbon steel or stainless steel. Secondly, the inner diameter and form should be selected according to the flow and pressure requirements. Hoses are braided and wound with different layers for different pressures. The steel pipe is the wall thickness and the inner diameter is taken. For hard tubes, select wall thickness based on inner diameter and pressure. If it is a hose, just determine the inside diameter and pressure value, do not select the outside diameter. Three is to choose the joint type, direct joint or 45 degree or 90 degree elbow.
We have a definite calculation formula for the inner diameter of hydraulic system pipe. Tubing size (inner diameter formula) : D≥4.61x (Q/V) ^1/2.
D is the inner diameter of the tubing mm
Q is the flow rate in tube L/min
V is the oil flow in the pipe M/s, the suction pipe 0.5-1.5m /s, the high pressure pipe 2.5-5m /s, and the return pipe 1.5-2.5m /s.
In actual production, it is often not necessary to calculate the choice of pipe, because the size of pipe is mainly determined by the connecting diameter of the components used in the system. The formula is mainly used to check the flow rate of liquid in the pipe to determine whether the selected pipe diameter is appropriate. The pipe is a purchased part with standard inside and outside diameters. The calculated inner diameter should refer to the relevant manual and be selected according to the standard.Formula - Wall thickness = pressure (MPA) x pipe diameter/(2x allowable stress). The allowable stress depends on the material of the pipe. Normal devices can be much bigger, with 100 megapascals, regardless of the material. That's a very conservative number. Such as tubing inner diameter 20mm, working pressure 30MPa, wall thickness 20x30/ (2x100) =3mm.
