In the production of Longitudinally Submerged Arc Welded (LSAW) steel pipes for oil and gas transportation engineering, several raw materials are essential for the manufacturing process. The specific raw material requirements can vary depending on the steel grade, pipe specifications, and the manufacturing standards followed. Here are the common raw materials typically used in the production of LSAW Steel Pipes for oil and gas transportation:

1. Steel Coils or Plates:

Carbon Steel: Carbon steel coils or plates are commonly used for LSAW Pipes in oil and gas transportation due to their strength and durability.

Alloy Steel: In some cases, alloy steel coils or plates are used to meet specific performance requirements, such as higher strength or corrosion resistance.

2. Welding Materials:

Welding Wire: Consumable welding wire is required for the submerged arc welding process used in manufacturing LSAW pipes.

Flux: Welding flux is used in conjunction with the welding wire to protect the weld pool during the welding process and improve the quality of the weld joint.

3. Anti-corrosion Coating Materials:

Epoxy Coating: Epoxy coatings are often applied to LSAW pipes to protect them from corrosion in harsh environments.

Polyethylene (PE) Coating: PE coatings provide additional protection against corrosion and abrasion.

4. Internal Coating Materials:

Cement Mortar Lining: Used for internal corrosion protection in pipelines, especially in water or corrosive fluid transportation systems.

Epoxy Internal Coating: Provides a smooth internal surface and additional corrosion resistance.

5. Pipe End Beveling Materials:

Beveling Tools: Tools and equipment are required for beveling the pipe ends to facilitate welding and ensure proper joint integrity.

6. Hydrostatic Testing Materials:

Sealing Materials: Gaskets and seals are needed for hydrostatic testing to ensure the pipes meet pressure testing requirements.

7. Paints and Marking Materials:

Pipe Identification Paints: Used for marking and identification purposes, indicating pipe specifications, material grade, and other relevant information.

8. Packaging Materials:

Steel Strapping: Used for bundling and securing the pipes for transportation.

Protective Wrapping: Wrapping materials to protect the pipes from environmental damage during storage and transportation.

9. Quality Control Materials:

Testing Equipment: Materials for conducting various quality control tests, including dimensional checks, mechanical testing, and non-destructive testing.

These raw materials are essential for the production of high-quality LSAW steel pipes used in oil and gas transportation engineering. Manufacturers adhere to industry standards and specifications to ensure the pipes meet the required performance and safety standards for use in demanding applications.

In the production of Longitudinally Submerged Arc Welded (LSAW) steel pipes for oil and gas transportation engineering, specific processing technologies and requirements are crucial to ensure the quality, integrity, and performance of the pipes. Here are the key processing technology requirements typically followed in the manufacturing of LSAW steel pipes for oil and gas transportation:

1. Pipe Forming:

Plate Preparation: Steel coils or plates are first subjected to cutting, edge milling, and pre-bending to form the required shape for the LSAW pipe.

Pipe Forming: The prepared plates are then formed into a cylindrical shape using a U-O forming process.

2. Welding:

Submerged Arc Welding (SAW): LSAW pipes are typically produced using the SAW method where the welding arc is submerged beneath a flux layer, ensuring a high-quality weld.

Welding Parameters Control: Precise control of welding parameters such as current, voltage, travel speed, and flux composition is essential for high-quality welds.

3. Heat Treatment:

Post-Weld Heat Treatment (PWHT): PWHT is often applied to relieve residual stresses and improve the mechanical properties of the welded joints.

4. Pipe End Beveling and Inspection:

Beveling: Pipe ends are beveled to facilitate welding and ensure proper joint fit-up.

Ultrasonic Testing (UT): Ultrasonic testing is performed to inspect the weld seam and ensure the absence of defects such as cracks or incomplete fusion.

5. Hydrostatic Testing:

Pressure Testing: Pipes are subjected to hydrostatic testing to verify their integrity and ability to withstand specified pressure levels.

6. Surface Treatment:

External Coating Application: Anti-corrosion coatings such as epoxy or polyethylene are applied to protect the pipes from corrosion.

Internal Coating Application: Internal linings such as cement mortar or epoxy coatings are applied for corrosion protection and to ensure smooth flow.

7. End Finishing:

End Beveling and Facing: Pipe ends are finished to the required specifications for welding and installation.

Thread Cutting: For pipes intended for threaded connections, threads are cut on the pipe ends.

8. Quality Control and Inspection:

Non-Destructive Testing (NDT): Various NDT methods including ultrasonic testing, radiographic testing, and magnetic particle testing are used to ensure the quality of welds and overall pipe integrity.

Dimensional Inspection: Verify dimensions, wall thickness, and other specifications.

9. Packaging and Shipment:

Bundling and Packaging: Pipes are bundled, secured, and protected with appropriate materials for transportation to the installation site.

By adhering to these processing technology requirements and industry standards, manufacturers can produce high-quality LSAW steel pipes that meet the stringent requirements for oil and gas transportation applications. Quality control, precision in welding processes, and proper surface treatment are essential to ensure the reliability and longevity of these pipes in demanding environments.