How to choose pipe diameter in hydraulic system? It needs to be analyzed on a case-by-case basis, because it depends on how far is the pump station from the actuator? Whether the speed of the actuator is strict, and the hydraulic system is continuous work, or work for a long time to rest. We can choose the pipe size and wall thickness by the maximum working pressure and the maximum flow through the hydraulic system.
1. How to choose the pipe diameter in the hydraulic system?
First of all, the material, is the need to choose hose or steel pipe, steel pipe needs to choose ordinary carbon steel or stainless steel. Secondly according to the traffic flow and pressure requirements choose inside diameter and form, hose into the steel wire armoured and winding, different layer corresponding to different pressure, steel pipe is the wall thickness, selection of inside diameter, if the hard tube, depending on the diameter and wall thickness, pressure if the hose, only need to determine the inside diameter and pressure value, do not need to choose outside diameter. The third is to choose the joint form, whether it is a direct joint or a 45 or 90 degree elbow.
2. How to choose the pipe diameter in the hydraulic system -- see the formula
For the hydraulic system pipeline diameter, we have a clear calculation formula, tubing specification (diameter formula): D ≥ 4.61x (Q/ V)^1/2. D is the inner diameter of tubing mm; Q is the flow rate in the tube L /min; V is the flow rate of oil in the pipe m/s, the suction pipe is 0.5 ~ 1.5m/s, the high pressure pipe is 2.5 ~ 5m/s, and the return pipe is 1.5 ~ 2.5m/s.
In practice, the selection of pipes often does not need to be calculated, because the pipe size is mainly determined by the size of the connecting diameter of the components used in the system. The formula is mainly used to check the flow rate of liquid in the pipeline to determine whether the selected diameter is appropriate. Tubing is a purchased part, its inner and outer diameter have standard specifications, the calculated inner diameter should refer to the relevant manual, according to the standard to determine the selection.
3. How to choose the pipe diameter in the hydraulic system -- how to choose the wall thickness?
Formula -- wall thickness = pressure (mpa) X pipe diameter/(2X allowable stress), allowable stress value to watch the road material, ordinary equipment can be selected to a point, no matter what material, are set to 100 mpa. That's a very conservative number. For example, the inner diameter of the tubing is 20 mm, the working pressure is 30 mpa, and the wall thickness is 20X30/(2x100) =3 mm.
