Application Of Hot-rolled Section Steel For Oil And Gas And Offshore Engineering Structures

The hot-rolled section steel for oil and gas and offshore engineering structures produced by GNEE Group is applied in global oil and gas projects.

 

           In June 2014, the hot-rolled section steel for oil, gas and offshore engineering structures produced by GNEE Group passed the review, obtained the supplier qualification for the global oil and gas projects of the project company, and achieved batch supply for this project. This project is the world's largest oil and natural gas project.

      In this project, hot-rolled section steel for oil, gas and offshore engineering structures has very important applications. Section steels such as H-beams, angles and channels are used to build the main structure of LNG plants, supports for offshore drilling platforms and pipeline support frames. For example, in LNG processing terminals, H-beams, as main girders and support columns, can withstand equipment loads and low-temperature environments.

 

 

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        These section steels have high strength. For example, the yield strength of Q345D is ≥345MPa, and the tensile strength reaches 470 - 630MPa, which can meet the load requirements such as ice squeezing and strong winds in the Arctic region. Moreover, they have good low-temperature toughness. For example, the longitudinal impact energy of Q345E at - 45℃ is ≥34J, which can ensure the stability of the steel structure under extremely cold conditions. Some of the section steels produced by GNEE Group have also been treated with anti-corrosion measures, which can resist the corrosion of marine salt spray and permafrost environments for a long time.

       The Q345E series H-beams provided by GNEE Group are used for the drilling rig frame, and their performance meets the requirements of equipment assembly. The steel profiles are delivered in a prefabricated modular form, which shortens the on-site construction period and ensures the smooth completion of the project

 

 

 

 

 

 

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         The hot-rolled section steel for oil and gas and offshore engineering structures produced by GNEE Group is applied in multiple oil and gas and offshore engineering projects, such as the construction projects of marine oil platforms and oil drilling machinery projects like SZ36 - 1, QHD32 - 6, Wenchang 13 - 1/2, Penglai 19 - 3, Dongfang 1 - 1, Zhanjiang, etc. These projects use various types of steel, such as:
L100×10 angle steel
L125×80×10 angle steel
L160×16 hot-rolled angle steel
Q355ND, Q355NH
Q420qE high - strength low - alloy hot - rolled section steel
T200×200 hot - rolled T - section steel
Q355NHD seawater - corrosion - resistant hot - rolled section steel
HM400×300 hot - rolled H - section steel
U250×90 hot - rolled U - section steel
HW150×150 medium - and small - sized hot - rolled H - section steel
Q310NH weather - resistant hot - rolled section steel, etc.
                   The usage scenarios of each type of steel will be introduced in detail below. In addition, GNEE Group can also provide more section steel. Some of the available models are placed at the end of the article. If you want to obtain the complete model list,please contact us               .beam@gneesteel.com

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  Application of Hot-rolled Section Steel for Oil, Gas and Offshore Engineering Structures in the SZ36-1 Offshore Oil Platform
       

         SZ36-1 is an offshore oilfield development project located in the Liaodong Bay of the Bohai Sea, facing challenges such as seawater corrosion, wind and wave loads, and low-temperature environments. In terms of the jacket structure, large-sized H-section steel of the HW and HM series is used as the main support framework. The cross-sectional shape of the H-section steel gives it strong bending resistance in all directions, enabling it to effectively utilize the material properties. With high bending strength, it can excellently withstand the vertical loads and horizontal wind and wave forces of the platform. For the pile leg connection components, L100×10 angle steel and [20a channel steel are welded to form joints.

         The angle steel has good stability and shear resistance, and the groove-shaped cross-section of the channel steel is conducive to connection with other components. The combination of the two ensures a stable connection between the pile legs and the jacket. Moreover, the steel used, such as Q355ND, meets the low-temperature toughness requirements at - 20℃, and can still maintain good mechanical properties at low temperatures to avoid brittle fracture.

          The deck support system uses high-frequency welded H-section steel, which not only has the advantage of the H-section steel itself with a light structural weight, reducing the overall structural weight and the bearing pressure of the foundation, but the high-frequency welding process also improves the integrity and seismic performance of the structure to adapt to the low-temperature pressure caused by the winter icing period.

        Application of Hot-rolled Section Steel for Oil and Gas and Offshore Engineering Structures in QHD32-6 Offshore Oil Platform
       QHD32-6 is a large comprehensive platform for crude oil processing and storage. This platform is often exposed to harsh environments such as high salt fog and strong typhoons. The weather-resistant hot-rolled section steel Q355NH is selected for the support frame of the oil storage tank. By adding alloy elements such as Cu and P to common carbon steel, a dense oxide protective film is formed on the surface of the steel.

         This process can significantly improve the atmospheric corrosion resistance, reduce maintenance costs, and extend the service life of the support structure of the oil storage tank. The trestle connection structure uses L125×80×10 angle steel to make the truss.

         Through a reasonable truss structure design, it can cope with the variable load conditions. The steel produced by GNEE has passed the API 2W standard certification, which can ensure the structural safety and reliability in the marine environment. The T200×200 hot-rolled T-section steel is selected for the offshore crane rail beam. The symmetrical cross-section of the T-section steel can make the wheel pressure of the crane evenly distributed on the rail beam, effectively reducing the risk of local deformation and ensuring the smoothness and safety of the crane operation.

                  Application of Hot-rolled Section Steel for Oil and Gas and Offshore Engineering Structures in the Wenchang 13-1/2 Offshore Oil Platform
            The Wenchang 13-1/2 platform is located in the Pearl River Estuary Basin of the South China Sea. It is in an environment with high temperature, high humidity, high salt fog, and frequent typhoons, posing extremely high requirements for the corrosion resistance of steel. The main structure of the platform uses high-strength low-alloy hot-rolled section steel Q420qE with a yield strength of ≥420MPa. It has high strength and can meet the wind pressure resistance design requirements under strong typhoons (wind speed ≥50m/s) in the South China Sea, ensuring the structural stability of the platform under strong winds. The support of the seawater treatment equipment uses 2205 duplex stainless steel hot-rolled section steel. The alloy ratio of chromium, nickel, and molybdenum forms a special metallographic structure, endowing it with excellent resistance to chloride ion corrosion. This can prevent pitting corrosion of the equipment support under long-term seawater scouring and ensure the long-term stable operation of the seawater treatment equipment.

             Application of Hot-rolled Section Steel for Oil and Gas and Offshore Engineering Structures in Penglai 19-3 Offshore Oil Platform
           Penglai 19-3 is one of the largest offshore oilfields in China. The platform is large in scale and complex in structure, and it needs to withstand long-term alternating loads. The HW300×300 hot-rolled H-section steel is used as the derrick base frame for the support structure in the wellhead area.

         By optimizing the sectional moment of inertia of the H-section steel, the deformation caused by equipment vibration during drilling operations can be effectively reduced, ensuring the stability of the derrick and the safe progress of drilling operations. The support truss of the flare arm adopts a combined cross-section of L160×16 hot-rolled angle steel to form a space truss structure. The good compressive and shear resistance of the angle steel enables it to effectively resist the combined action of thermal loads and wind loads generated during flare combustion in the space truss structure, maintaining the stability of the flare arm.

         The U250×90 hot-rolled U-section steel is selected for the helicopter deck keel. By thickening the web design, the local compressive strength is improved, which can meet the requirements of the concentrated load generated during helicopter takeoff and landing, ensuring the safe takeoff and landing of the helicopter.

      Application of Hot-rolled Steel Sections for Oil, Gas and Offshore Engineering Structures in the Dongfang 1-1 Offshore Oil Platform
         The Dongfang 1-1 platform is located in the Yingge Sea of the South China Sea. It is a deepwater gas field development platform facing challenges such as high water pressure, strong corrosion, and far-sea construction. The underwater jacket extension section adopts Q355NHD hot-rolled steel sections resistant to seawater corrosion. Q355NHD steel sections have seawater corrosion resistance, which can greatly extend the service life of underwater structures. The designed service life is ≥ 25 years. The HM400×300 hot-rolled H-section steel is used for the connection beams of the deck module. The high-strength characteristics of the H-section steel can meet the bearing requirements of the connection beams.

       Moreover, it is connected by high-strength bolts, which is convenient and fast, enabling rapid module assembly and meeting the efficient and convenient construction requirements in the modular construction of far-sea platforms.

             Application of Hot-rolled Sections for Oil, Gas and Offshore Engineering Structures in Zhanjiang and Surrounding Offshore Engineering.
          Zhanjiang serves as an important offshore engineering base in South China. For the support of wellhead platforms, HW150×150 medium and small hot-rolled H-shaped steel is used. For the support of coastal oil pipelines, a sliding support is made of [16 hot-rolled channel steel. The channel structure of the channel steel is convenient for installing sliding components, allowing the pipeline to generate axial displacement due to temperature changes and avoiding damage to the pipeline caused by thermal expansion and contraction.

             At the same time, the surface of the steel is treated with epoxy zinc-rich primer (dry film thickness ≥ 60μm). The epoxy zinc-rich primer has good adhesion and anti-rust performance to the steel, which can protect the support from corrosion in the coastal environment. For the experimental composite structure of offshore wind power and oil platforms, Q310NH weather-resistant hot-rolled section steel is used.

            At the connection part between the wind power tower and the oil platform, the corrosion resistance and good mechanical properties of the weather-resistant steel are utilized to achieve the sharing of the structure, optimize the spatial layout, and greatly improve the utilization efficiency of the marine space.

Available grades, categories and uses

Mechanical properties

Q/MGB 455-2015 Hot rolling H section steel for offshore oil drilling platform

Nabors X drill project with Q345E hot-rolled H-beam technical agreement

Other Standard for oil & gas and ocean engineering structure

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