Details of DN200 LSAW steel pipe

DN200 LSAW (Longitudinal Submerged Arc Welding) steel pipes are widely used in various industries for their robust construction, reliability, and efficiency in transporting fluids and gases. Here are the detailed specifications and characteristics of DN200 LSAW steel pipes.

1. Dimensions and Sizes

Nominal Diameter (DN): 200 mm

Outside Diameter (OD): Typically 219.1 mm (8.62 inches)

Wall Thickness: Can vary depending on the specific requirements, typically ranging from 6 mm to 25 mm or more.

Length: Standard lengths are 6 meters, 12 meters, or custom lengths as per the requirement.

2. Material Specifications

Steel Grade: Commonly manufactured using steel grades such as API 5L (for line pipes), ASTM A53, ASTM A252, or other specified grades.

Material: Carbon steel, which provides high strength, durability, and resistance to stress and pressure.

3. Manufacturing Process

Longitudinal Submerged Arc Welding (LSAW): This process involves bending and welding steel plates into a cylindrical shape. The longitudinal weld seam is produced using submerged arc welding, which ensures a high-quality weld with minimal defects.

Inspection and Testing: LSAW pipes undergo rigorous testing, including X-ray inspection, ultrasonic testing, hydrostatic testing, and mechanical property testing to ensure compliance with industry standards.

4. Applications

Oil and Gas Transportation: Widely used for the transmission of oil, natural gas, and other petroleum products.

Water Supply Systems: Suitable for potable water and wastewater conveyance.

Structural Applications: Used in construction projects, bridges, buildings, and infrastructure.

Industrial Applications: Suitable for high-pressure and high-temperature applications in various industries such as chemical, power generation, and mining.

5. Coating and Protection

External Coating: To protect against corrosion, LSAW pipes may be coated with layers such as 3LPE (three-layer polyethylene), FBE (fusion-bonded epoxy), or bitumen.

Internal Coating: For specific applications, the interior of the pipes can be lined with epoxy, cement, or other protective materials to prevent corrosion and enhance flow characteristics.

6. Standards and Certifications

API 5L: Standard for line pipe suitable for use in conveying gas, water, and oil in the oil and natural gas industries.

ASTM A53: Standard specification for pipe, steel, black and hot-dipped, zinc-coated, welded, and seamless.

ISO 3183: International standard for petroleum and natural gas industries–steel pipe for pipeline transportation systems.

7. End Finishes

Beveled Ends: Typically used for welding purposes.

Plain Ends: Suitable for certain coupling methods.

Threaded Ends: For specific applications requiring threaded connections.

Conclusion

DN200 LSAW steel pipes are essential components in various industries due to their strength, durability, and ability to handle high-pressure applications. Ensuring the right specifications and protective measures can significantly enhance their performance and longevity.