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Seamless steel pipe has a four-story structure, the most inner layer is extruded thermoplastic tube, in the transmission of liquid from the sealing effect; the middle of the two lining is filled with carbon polyethylene tube, it has arrived
The steel pipe has a four-layer structure, the most inner layer is extruded thermoplastic pipe, in the transmission of liquid from the sealing effect; the middle two layers of lining with carbon filled polyethylene tube, it has a long-term resistance to ultraviolet radiation, And can exclude external static electricity. The outermost layer is an extruded thick outer shield for protecting the bottom of the tube from external influences. Standard steel pipe for the rated pressure in line with ANSI classification, such as grade 300 equivalent to 5.15MPa; grade 400 is equivalent to 6.89MPa; grade 600 is equivalent to 10.3MPa.
Seamless offshore steel pipe design is based on API17J, 17K and RP17B. Land design standards for steel use slightly deviate from the API standard requirements, the use of API17J classification methods and materials, the pressure, tension and damage limits are within the specified range. The test was carried out according to the requirements of APIRP17B. The terminal fittings are designed to meet the integrity of the structural structure, to ensure that the inner and outer extrusion layers are sealed, and to ensure that the tension and pressure loads are delivered to the tube structure. The samples of the terminal fittings were subjected to blasting and axial tensile tests.

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