Special Requirements for Seamless Steel Pipes in Chemical Pipelines

In the big family of industrial pipes, seamless steel pipe can be called a unique "seamless warrior". It is a rolled steel pipe without welds, made by perforating a whole round steel. Its production process is complex and diverse. There are also many types of seamless steel pipes. With the characteristics of no welds, high strength, good toughness, high pressure resistance, corrosion resistance, etc., seamless steel pipes are widely used in many fields such as petroleum, chemical industry, aviation, aerospace, nuclear industry, etc. In the chemical pipeline system, it plays a key role, so what special requirements does the chemical pipeline have for seamless steel pipes?
 
Special requirements for seamless steel pipes in chemical pipelines
 
The working environment of chemical pipelines is extremely complex. The transported media are often corrosive, flammable and explosive, high temperature and high pressure, which puts extremely high demands on pipeline materials. Seamless steel pipes have become one of the important choices for chemical pipelines due to their own advantages. So, in this complex "test field", what special requirements do seamless steel pipes need to meet?
 
1. Corrosion resistance
 
This is one of the most important requirements for seamless steel pipes in chemical pipelines. Chemical media are highly corrosive and can cause pipeline corrosion, leakage, and even safety accidents. Therefore, it is necessary to select appropriate corrosion-resistant materials according to the type of conveying media.
Acidic media: Pipelines for transporting acidic media such as hydrochloric acid and sulfuric acid need to be made of materials resistant to acid corrosion, such as stainless steel (such as 316L, 304L), titanium, nickel-based alloys, etc.
Alkaline media: Pipelines for transporting alkaline media such as sodium hydroxide need to be made of materials resistant to alkaline corrosion, such as nickel, nickel-based alloys, etc.
Salt media: Pipelines for transporting salt media such as sodium chloride need to be made of materials that are resistant to chloride ion corrosion, such as 316L stainless steel, titanium, etc.
Other special media: Some special chemical media may have unique corrosiveness, and it is necessary to select corresponding corrosion-resistant materials according to the specific media.
 
2. High temperature performance
 
Some chemical production processes need to be carried out under high temperature conditions, so the pipelines that transport high temperature media need to have good high temperature performance, including:
High temperature strength: It can still maintain sufficient strength at high temperatures to withstand the pressure inside the pipe.
Oxidation resistance: Not susceptible to oxidation corrosion at high temperatures.
Creep resistance: Not prone to creep deformation under high temperature and stress
Commonly used high-temperature pipeline materials include alloy steel (such as 12Cr1MoV, 15CrMoG), stainless steel (such as 310S, 321H), etc. Relevant information mentions that steam boiler steel pipes working under medium and high pressure are mostly thick-walled pipes, which are required to have high strength, oxidation resistance, and good organizational stability, which is similar to the requirements of chemical pipelines for high-temperature performance.
 
3. High voltage performance
 
Some chemical production processes need to be carried out under high pressure conditions, so the pipelines that transport high pressure media need to have good high pressure performance, including:
Sufficient strength: To withstand the high pressure inside the pipeline and prevent bursting.
Good toughness: To prevent brittle fracture under high pressure.
High-pressure pipelines are usually made of thick-walled seamless steel pipes and are made of high-strength alloy steel.
 
4. Low temperature performance
 
Some chemical production processes need to be carried out under low temperature conditions, so pipelines that transport low temperature media need to have good low temperature performance, including:
Low temperature toughness: Not prone to brittle fracture at low temperatures.
Commonly used low temperature pipeline materials include low temperature steel, austenitic stainless steel, etc.
 
5. Sealing performance
Leakage of chemical media may cause environmental pollution and safety accidents, so chemical pipelines need to have good sealing properties. Seamless steel pipes have no welds, which reduces the risk of leakage and are therefore more suitable for transporting media that are prone to leakage.
 
6. Welding performance
 
The installation and connection of chemical pipelines require a lot of welding work, so seamless steel pipes need to have good welding performance to ensure the quality and reliability of the welds. Relevant information mentioned that the welding steel pipe process is relatively simple and the cost is low, but the strength is lower than that of seamless steel pipes. This shows that seamless steel pipes have more advantages in chemical pipelines with higher strength requirements.
 
7. Other requirements
 
Dimensional accuracy: The installation and connection of chemical pipelines require high dimensional accuracy.
Surface quality: The inner surface of the pipeline should be smooth to reduce the resistance and fouling of the medium. 
Standard specifications: The design, manufacture, installation and inspection of chemical pipelines must comply with relevant standard specifications, such as GB/T 8163 "Seamless Steel Pipes for Fluid Transportation", GB/T 14976 "Stainless Steel Seamless Pipes for Fluid Transportation", HG/T 20553 "Series of Size Selection of Seamless and Welded Steel Pipes for Chemical Piping", etc.
 
Conclusion
 
Chemical pipelines have very strict requirements for seamless steel pipes. It is necessary to select appropriate materials and specifications based on factors such as the type of conveying medium, working temperature, working pressure, etc., and strictly follow relevant standards and specifications for design, manufacturing, installation and inspection to ensure the safe and reliable operation of the pipeline. When selecting seamless steel pipes, you must be discerning and choose Permanent Steel Manufacturing Co.,Ltd , which has excellent reputation and strong strength. We have won wide acclaim in the industry for our excellent product quality and high-quality services. With our profound industry background and technological innovation capabilities, we have become the preferred partner trusted by many customers. We are committed to providing customers with the highest quality seamless steel pipe products.

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