Welded steel pipe is made of steel plates linked by welding process. The pipe is characterized by high pressure resistance, high temperature resistance, corrosion resistance, sealing and so on. Especially compared to other steel pipes, welded steel pipe is favored by many projects because of its good quality and low price. Especially the oil and gas industry.
When thinking of welded steel pipe, many people are worried about whether the weld seam of welded pipe will be easy to break or sealing is not good, affecting the life of the project. In fact, it is not, when you understand the welding process of welded steel pipe, you know that welded pipe is stronger than seamless pipe. And welded pipe has more specifications than seamless pipe, more convenient to choose.
What Is Welded Steel Pipe
The production process of welded steel pipe is quite complicated, generally it will be completed through the steps of plate spreading, high-frequency welding, heat treatment, cooling, cutting, coating, etc.
In order to ensure the high quality performance of the product, each step must be supervised and completed by professional engineers.
1. PUncoiling: as we all know, welded steel pipe is welded steel plate, steel plate transportation over the first step is to make the steel plate become smooth, and will be more than one steel plate linked together for the next step to prepare.
2. High Frequency Welding: High frequency welding is an important step of welded pipe, the ends of the plate are heated quickly by the frequency current, and then connected together by extrusion, at this time the steel plate has become a steel pipe, and there is a long weld seam.
This type of welding is very efficient, and according to the standard and pre-production experiments, this weld has the same density, hardness and sealing as the steel plate itself.
3. Heat treatment: After the welding is completed, the structure of the steel plate itself will change because of high-frequency welding, at this time, if the temperature changes too quickly, bad lead to cracks in the weld bubbles, etc., seriously affecting the quality of the welded pipe, and therefore will be heat-treated to protect the weld.
4. Coating: In order to increase the corrosion resistance and life of welded steel pipe, coating is an indispensable step. Inner coating / outer coating / epoxy coating, you can choose freely.
So the oil and gas industry doesn’t have to worry about welded seams at all when choosing welded pipes!
Pipe Types For The Oil and Gas Industry
There are many types and standards of welded steel pipe that are often used in the oil and gas industry. The specific choices may vary from country to country and geographic region to geographic region, as the standards for the pipeline industry are generally set by the state or a national union.
The following are some of the common types of welded steel pipe and the corresponding standards in the oil and gas industry.
1.API 5L Welded Pipe
Standard: Developed by the American Petroleum Institute (API).
Application: mainly used for the transportation of oil and gas, including oil and gas pipelines, natural gas pipelines, cement transportation.
Characteristics: Steel grades graded A, B, X42, etc., available in different grades and strengths. Can be used in high pressure and high temperature conditions.
2.ASTM A53 welded pipe
Standard: Developed by the American Society for Testing and Materials (ASTM).
Applications: Suitable for water, gas, structural and mechanical applications, also used in some oil and gas industries.
CHARACTERISTICS: Divided into Type E and Type S, of which Type E is electrically resistant welded pipe and Type S is seamless pipe. Commonly used for general low pressure liquid transportation.
3.ASTM A106 welded pipe
Standard: developed by the American Society for Testing and Materials (ASTM).
Application: mainly used for high temperature and high pressure oil and gas pipelines, such as oil refining and chemical industry.
Features: steel grade is divided into A, B, C, for high temperature service. Commonly used in piping systems supplying high temperature liquids and gases.
4.EN 10217 welded pipe
Standard: Developed by the European Committee for Standardization (CEN).
Application: For general engineering and low temperature oil and gas pipelines.
Characteristics: According to the use of the pipe and the material, is divided into several parts, such as EN 10217-1, EN 10217-2 and so on. It has a wide range of uses and can be adapted to different environments and industrial needs.
Oil and Gas welded Steel Pipe Advantages
1. Good value for money: through the above introduction, the hardness and strength of welded pipe should be no doubt. Welded pipe relative to seamless pipe, in the same environment, welded pipe can be made lighter and thinner, can save a lot of cost, in large-scale especially transportation projects, is a very good choice.
2. Customizable: the length of welded pipe can be customized according to the specific project, and welded pipe can be linked in different ways – spiral, welded, flange, etc., with strong flexibility.
3. Adaptability: no matter oil, gas, crude oil, etc., welded pipe can be used to transport, and the production speed of welded pipe is relatively fast, for urgent projects, welded pipe is a good choice.
Overall, welded pipe as the choice of oil and gas pipeline combines the advantages of strength, economy, production efficiency and adaptability in many aspects, providing a reliable and economical transportation solution for the oil and gas industry.