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Flexible steel pipe features and widely used

A 2km long, 6in diameter pipe in Canada was shut down due to corrosion problems. The route of the pipeline passes through the land of 5-6 landowners. It is particularly difficult to apply for the construction of a new pipeline. As a result, the pipeline has been decided to be repaired. Wellstream's approach to repair is to place a single piece of flexible steel on an old tube, saving you money and eliminating environmental damage by eliminating the need to apply for new tubes. The repair line is used to deliver liquid carbon dioxide to the injection wellhead to increase oil recovery. There are two 90 ¡ã turns and one road crossing where the wellhead leads. Before the pipe penetrate into the job to go through the pigging, removal and other obstacles work.
Flexible steel pipe has a four-layer structure, the innermost layer is extruded thermoplastic pipe, sealing liquid in the transmission; the middle two lining is filled with carbon polyethylene tube, which has long-term resistance to UV radiation , And can exclude external static electricity. The outermost layer is an extruded, thick outer shield that protects the bottom of the tube from external influences. Standard flexible pipe applicable pressure rating in line with the ANSI classification, such as grade 300 is equivalent to 5.15MPa; grade 400 is equivalent to 6.89MPa; grade 600 is equivalent to 10.3MPa. The design of offshore flexible pipes is based on APIs 17J, 17K and RP 17B. The design criteria for onshore Flexible Steel Pipe slightly deviate from the requirements of the API Standard. The API 17J classification and materials are used within the specified limits of pressure, tension and failure limits. The test was carried out in accordance with API RP 17B.
Terminal fittings are designed to meet the requirements of maintaining the integrity of the structure, ensuring the sealing of the inner and outer extruded layers and assuring the transmission of tensile and compressive loads to the pipe structure. Samples of terminal fittings were subjected to blasting and axial tensile testing
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