How To Choose The Diameter Of The Pipeline in The Hydraulic System?

The specific situation still needs to be analyzed, as it depends on whether the pump station and the actuator are far away? Is there a strict requirement for the speed of the actuator, and is the hydraulic system working continuously or resting for a long time after working. We can choose the size and wall thickness of the pipeline based on the upper working pressure and flow rate of the hydraulic system, and consider the material of the pipeline. These will all have relevant information in the hydraulic system manual.

1. How to choose the diameter of pipelines in hydraulic systems - how to select pipelines?

Firstly, it depends on the material, whether to choose rubber hose or steel pipe, and whether to choose ordinary carbon steel or stainless steel for the steel pipe. Secondly, the inner diameter and form should be selected based on the flow rate and pressure resistance requirements. Hoses are divided into steel wire weaving and winding, with different layers corresponding to different pressure resistance. Steel pipes have different wall thicknesses, and the inner diameter should be selected. If it is a hard pipe, the wall thickness should be selected based on the inner diameter and pressure. If it is a hose, only the inner diameter and pressure resistance value need to be determined, and the outer diameter does not need to be selected. The third option is to choose the joint form, whether it is a direct joint or a 45 degree or 90 degree elbow.

2. How to Choose Pipe Diameter in Hydraulic Systems - Based on Formulas

We have a clear calculation formula for the inner diameter of hydraulic system pipelines. The specification of the oil pipe (inner diameter formula) is D ≥ 4.61X (Q/V) ^ 1/2. Detailed explanation D is the inner diameter MM of the oil pipe; Q is the flow rate in the pipe, L/MIN; V is the flow rate M/S of the oil in the pipe, taken as 0.5~1.5M/s for the suction pipe, 2.5~5M/s for the high-pressure pipe, and 1.5~2.5M/s for the return pipe.

In practical production, selecting pipes often does not require calculation, as the size of the pipes is mainly determined by the size of the connecting diameter of the components used in the system. This formula is mainly used to verify the liquid flow rate in pipelines to determine whether the selected pipe diameter is suitable. Oil pipes are purchased components, and their inner and outer diameters have standard specifications. The calculated inner diameter should be consulted in relevant manuals and selected according to the standards.

3. How to choose the diameter of the pipeline in the hydraulic system - how to choose the wall thickness?

Formula - wall thickness=pressure (MPa) X pipe inner diameter/(2X allowable stress), the value of allowable stress depends on the material of the pipeline. For ordinary equipment, it can be selected larger, and regardless of the material, it is set to 100 MPa. This value is already very conservative. For example, if the inner diameter of the oil pipe is 20mm, the working pressure is 30MPa, and the wall thickness is 20X30/(2X100)=3mm.