About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Hydraulic tubes are pipes for conveying hydraulic fluids and are generally made of high-pressure, corrosion-resistant materials. Common hydraulic oil pipe models include the following:
|
Model |
Pipe diameter (mm) |
Wall thickness (mm) |
Maximum operating pressure (MPa) |
|
GB/T 3639-2009 |
4-120 |
0.5-20 |
25 |
|
JIS G 3455 |
8-114.3 |
1-12 |
32 |
|
EN 10305-4 |
6-42 |
0.5-5 |
16 |
|
ASTM A519 |
15.9-323.8 |
1-20 |
80 |
Note: GB/T indicates national standards, JIS indicates Japanese industrial standards, EN indicates European standards, and ASTM indicates American Society for Testing and Materials standards.
The diameter of hydraulic oil pipes is one of the key factors affecting the flow rate in hydraulic systems. The main factors affecting it are as follows.
1. Pipeline length: The increase in pipeline length will increase friction, thereby reducing flow rate.
2. Pipe material: The inner wall smoothness of pipes of different materials is different, and the pressure drop will also be different.
3. Number of elbows and bending angles: The greater the number of elbows and bending angles in the pipeline, the greater the pressure drop, so the flow rate will also decrease.
4. Pipe diameter: The smaller the pipe diameter, the smaller the flow rate; the larger the pipe diameter, the greater the flow rate.
The flow rate of hydraulic oil pipes mainly depends on the size of its inner diameter, the length of the pipe and the viscosity of the fluid. Generally speaking, the flow rate of hydraulic oil pipes can be calculated using the following formula:
Q=πr²v
Where Q is the flow rate in m³/s; π is the circumference; r is the inner diameter of the oil pipe in m; v is the flow rate of the liquid in m/s.
The following table lists the flow rates of commonly used hydraulic oil pipes:
|
Pipe diameter (mm) |
Flow rate (L/min) |
|
4 |
0.015 |
|
6 |
0.034 |
|
8 |
0.06 |
|
10 |
0.094 |
|
12 |
0.135 |
|
16 |
0.242 |
|
20 |
0.376 |
Other parameters
In addition to the above-mentioned pipe diameter, wall thickness, maximum operating pressure and flow rate, there are some other parameters of hydraulic oil pipes that need attention, such as: pressure resistance, wear resistance, bending radius, weight, etc.
Q=πD²/4×v
In the formula, Q is the flow rate, D is the pipe diameter, and v is the liquid flow rate.
It can be seen that the flow rate is directly proportional to the pipe diameter. When the liquid flow rate is constant, the larger the pipe diameter, the greater the flow rate; when the pipe diameter is constant, the faster the flow rate, the greater the flow rate.
In actual applications, factors such as pipeline length, pipe material, number of elbows and bending angles in the hydraulic system cannot be ignored. Therefore, when designing a hydraulic system, the diameter of the hydraulic oil pipe should be comprehensively considered according to the actual situation to obtain the best flow effect.
In short, the diameter of the hydraulic oil pipe is closely related to the flow rate. When designing a hydraulic system, a variety of factors should be considered comprehensively to select the best pipe diameter to achieve the best hydraulic system effect. Different hydraulic oil pipes are suitable for different scenarios and applications. You need to judge and choose according to your specific needs. For most industries and applications, conventional hydraulic oil pipes can already meet the needs.
E-mail: sales@eastern-steels.com
