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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.
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In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
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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.
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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.
Classification of hydraulic tubes
Hydraulic tubes can be divided into two categories according to different materials: iron hydraulic tubes and non-iron hydraulic tubes. Iron hydraulic tubes are divided into seamless pipes and welded pipes, and non-iron hydraulic tubes mainly include nylon pipes, polyester pipes, polyurethane pipes, corrugated pipes, etc.
Common materials for hydraulic tubes
1. Iron hydraulic tubes
Cold-drawn seamless steel pipes, welded steel pipes, cast iron pipes, etc.
2. Non-iron hydraulic tubes
Nylon pipes, polyester pipes, polyurethane pipes, corrugated pipes, etc.
Common hydraulic tube diameter parameter chart
The following is a common hydraulic tube diameter parameter table for reference only:
1. Iron seamless pipe
|
Pipe diameter（mm） |
Inner diameter（mm） |
Outer diameter（mm） |
Wall thickness（mm） |
|
4 |
2.3 |
4 |
0.85 |
|
5 |
3.3 |
5 |
0.85 |
|
6 |
4.3 |
6 |
0.85 |
|
8 |
6.5 |
8 |
0.75 |
|
10 |
8.5 |
10 |
0.75 |
|
12 |
10.5 |
12 |
1 |
|
14 |
12.5 |
14 |
1 |
|
16 |
14.5 |
16 |
1 |
|
18 |
16.5 |
18 |
1 |
|
20 |
18.5 |
20 |
1 |
2. Iron welded pipe
|
Pipe diameter（mm） |
Inner diameter（mm） |
Outer diameter（mm） |
Wall thickness（mm） |
|
6 |
5.4 |
6.5 |
0.55 |
|
8 |
7.4 |
8.5 |
0.55 |
|
10 |
9.3 |
10 |
0.35 |
|
12 |
11.2 |
12.5 |
0.65 |
|
14 |
13.1 |
14 |
0.45 |
|
16 |
14.9 |
16 |
0.55 |
|
18 |
16.7 |
18 |
0.65 |
|
20 |
18.5 |
20 |
0.75 |
|
22 |
20.3 |
22 |
0.9 |
|
25 |
23 |
25 |
1 |
3. Nylon hose
|
Pipe diameter（mm） |
Inner diameter（mm） |
Outer diameter（mm） |
|
4 |
2.5 |
4 |
|
6 |
4 |
6 |
|
8 |
5.5 |
8 |
|
10 |
7 |
10 |
|
12 |
9 |
12 |
|
14 |
10.5 |
14 |
|
16 |
12 |
16 |
|
18 |
13.5 |
18 |
|
20 |
15 |
20 |
4. Polyester tube
|
Pipe diameter（mm） |
Inner diameter（mm） |
Outer diameter（mm） |
|
6 |
4 |
6 |
|
8 |
5.5 |
8 |
|
10 |
7 |
10 |
|
12 |
9 |
12 |
|
14 |
11 |
14 |
|
16 |
13 |
16 |
|
18 |
15 |
18 |
|
20 |
16 |
20 |
5. Polyurethane tube
|
Pipe diameter（mm） |
Inner diameter（mm） |
Outer diameter（mm） |
|
4 |
2.5 |
4 |
|
6 |
4 |
6 |
|
8 |
5.5 |
8 |
|
10 |
7 |
10 |
|
12 |
9 |
12 |
|
14 |
11 |
14 |
|
16 |
12 |
16 |
|
18 |
13.5 |
18 |
|
20 |
15 |
20 |
6. Bellows
|
Pipe diameter（mm） |
Inner diameter（mm） |
Outer diameter（mm） |
|
6.3 |
4.5 |
6.3 |
|
8 |
6 |
8 |
|
10 |
7.5 |
10 |
|
13 |
10 |
13 |
|
16 |
12.5 |
16 |
|
19 |
15 |
19 |
|
22 |
18 |
22 |
|
25 |
21 |
25 |
The above is only a table of common hydraulic tube diameter parameters. According to different hydraulic system requirements and working conditions, parameters such as pipe diameter need to be considered comprehensively. It is recommended that when designing and maintaining hydraulic systems, appropriate pipe diameters and materials should be selected according to actual conditions.
How to determine the diameter of hydraulic tubes
1. Liquid flow calculation
Liquid flow is the basis for selecting the diameter of hydraulic tubes in hydraulic systems. In hydraulic system design, it is generally necessary to know the flow rate of the liquid. By calculating the flow rate of the liquid, the size of the pipe and parameters such as flow rate can be determined. The calculation formula for liquid flow is as follows:
Q=πd²/4*v
Where Q represents flow rate, d represents pipe diameter, and v represents flow rate. According to the formula, the relationship between pipe diameter and flow rate is inversely proportional, that is, the larger the pipe diameter, the smaller the flow rate; the smaller the pipe diameter, the greater the flow rate.
2. Working pressure calculation
The working pressure of the hydraulic tube in the hydraulic system is also one of the key factors in selecting the internal size of the pipe. The working pressure of the hydraulic tube depends on the maximum working pressure in the system. Usually, designers use the highest working pressure in the hydraulic system as the working pressure of the hydraulic tube. When calculating the design pressure of the pipeline, it is necessary to take the working pressure as the basis and consider factors such as shock waves and temperature changes that may occur in the system.
3. Flow rate calculation
The flow rate of the pipeline is also an important parameter for designing the diameter of the hydraulic tube. It can be calculated by the following formula:
v=Q/πd²/4
Wherein, v represents the flow rate, d represents the pipe diameter, and Q represents the flow rate. Generally speaking, the flow rate is preferably 5 to 8 meters per second. Too high or too low will affect the normal operation of the hydraulic system.
Conclusion
The selection of materials and pipe diameter of hydraulic tubes is crucial to the normal operation of hydraulic systems. When designing and maintaining hydraulic systems, various factors should be considered comprehensively to select appropriate materials and pipe diameters. To determine the diameter of the hydraulic tube, it is necessary to comprehensively consider factors such as liquid flow, working pressure and flow rate, select appropriate pipe specifications and materials, and ultimately ensure the normal and safe operation of the system.
Read more: Joint Models of American Seamless Hydraulic Piping or Pickling treatment process of hydraulic system pipeline
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