The following types of steel pipes are suitable for offshore oil and gas extraction platforms, each with its own advantages:

seamless steel tube

High strength and corrosion resistance: able to withstand high pressure and high temperature environments, suitable for key parts such as oil and gas pipelines on offshore platforms, such as Q345B/Q355B seamless pipes, which have excellent mechanical and chemical properties, high strength, high temperature resistance, pressure resistance, and corrosion resistance, ensuring safe and stable operation in harsh marine environments and high-pressure oil and gas transportation conditions

High manufacturing accuracy: High dimensional accuracy, good control of ovality, uniform wall thickness, can ensure the sealing and stability of pipeline connections, reduce leakage risks, and are crucial for the efficiency and safety of oil and gas transportation on offshore platforms

Good anti fatigue performance: Seamless steel pipes exhibit excellent anti fatigue performance under complex stress conditions, such as wave impact, platform vibration, etc. They can work stably for a long time, extend their service life, and reduce maintenance costs.

Straight seam submerged arc welded steel pipe (LSAW)

Excellent weld quality: Adopting double-sided submerged arc welding technology, the weld has good toughness, plasticity, uniformity, and density, with few welding defects, and can withstand high pressure and stress. It is suitable for high-pressure oil and gas transmission pipelines on offshore platforms

Large range of pipe diameter and wall thickness: Large diameter and thick walled steel pipes can be produced to meet the different needs of offshore platforms for high flow oil and gas transportation and structural support, such as large diameter and thick walled LSAW Steel Pipes commonly used in structural components such as large oil and gas pipelines and pipe racks

Low residual stress: During the manufacturing process, the expansion process is used, and the residual stress is close to zero, without the "Bauschinger effect", which avoids pipeline stress corrosion caused by stress concentration and improves the corrosion resistance and service life of steel pipes in marine environments

Spiral seam submerged arc welded steel pipe (SSAW)

Good flexibility and adaptability: The weld seam has a certain angle with the direction of the main stress of the pipeline, which shortens the equivalent length of the weld defect and reduces the risk for a single defect. Its special directionality is beneficial for crack prevention and is suitable for the complex stress and environmental conditions of offshore platforms

High production efficiency and low cost: Compared with seamless steel pipes, spiral seam submerged arc welded steel pipes have higher production efficiency and relatively lower costs. They can reduce the construction and operation costs of offshore platforms while ensuring certain performance requirements. They are widely used in some cost sensitive non critical parts

Capable of withstanding certain pressure and temperature: able to meet the general pressure and temperature requirements during oil and gas transportation on offshore platforms, widely used in gathering and transportation pipelines and other systems in offshore oil fields

Straight seam resistance welded steel pipe (ERW)

High dimensional accuracy: using hot-rolled coil as raw material, the wall thickness can be uniformly controlled at around ± 0.2mm. The ends of the steel pipe are chamfered according to the standard, and the length is delivered to ensure the accuracy and sealing of the pipeline connection, which is conducive to the rapid installation and stable operation of the offshore platform pipeline system

High production efficiency and low cost: Resistance welding has the characteristics of high production efficiency, low cost, material saving, and easy automation, which can effectively reduce the procurement cost and construction period of offshore platform steel pipes, and improve the economic benefits of the project

Mature weld treatment technology: By using local conventional heat treatment processes for welds, the microstructure of the weld area can be matched with the base metal, eliminating stress, softening, and refining the microstructure, improving the comprehensive mechanical properties of the welding heat affected zone, and ensuring the long-term performance of steel pipes in marine environments

Monel alloy steel pipe (MONEL400)

Excellent corrosion resistance: Its corrosion resistance is particularly outstanding in seawater and saltwater, and it has strong resistance to corrosive media in marine environments. It can effectively prevent steel pipes from being damaged by seawater corrosion, greatly extending the service life of offshore platforms

High strength and toughness: Not only does it have high strength, but it can also maintain good mechanical properties over a wide temperature range. Even in low temperature environments, it can still maintain excellent toughness and strength, suitable for long-term stable operation of offshore platforms under various harsh weather conditions

Good processing performance: It can perform various forms of processing, such as welding, cutting, bending, and rolling, making it easy to manufacture components of various shapes and structures, meeting the complex design and construction requirements of offshore platforms

Common types

1. Seamless steel pipe

Common scenarios and reasons: Key high-pressure systems and high-precision requirements are commonly used in offshore oil and gas extraction platforms. For example, in the oil pipes of wellhead equipment and high-pressure instrument pipes of offshore platforms, due to the extremely high requirements for the strength, dimensional accuracy, and fatigue resistance of steel pipes in these areas. Seamless steel pipes have no welds, avoiding the risk of strength weakening and leakage that may be caused by welds. They can withstand enormous pressure and complex stress environments, ensuring stable operation under high pressure, high temperature, and frequent pressure fluctuations.

2. Straight seam submerged arc welded steel pipe (LSAW)

Common scenarios and reasons: It is often used in large oil and gas transmission pipelines and important structural support parts of offshore platforms. Such as long-distance subsea oil and gas pipelines connecting offshore platforms and land terminals, and large pipeline structures on platforms. Its large diameter and thick wall characteristics can meet the transportation needs of a large amount of oil and gas. At the same time, excellent weld quality and low residual stress enable it to resist corrosion and complex external forces in marine environments, ensuring long-term safe operation under high pressure and high load working conditions.

3. Spiral seam submerged arc welded steel pipe (SSAW)

Common scenarios and reasons: It is widely used in the gathering and transportation pipeline system of offshore platforms and some non critical structural components. For example, in offshore platforms, oil and gas are collected from various wellheads and transported to gathering pipelines for processing facilities. Its excellent flexibility and adaptability enable it to perform well in dealing with complex stress conditions such as vibration and wave impact on offshore platforms. Moreover, its high production efficiency and relatively low cost advantages make it more popular in cost sensitive areas. As long as the work pressure and environment are not extremely harsh, it can meet basic transportation and structural support needs.