Pipeline due to corrosion and forced to shut down or even out of things often happen, the use of flexible steel pipe can solve this problem, is a flexible pipe set to the old pipe. Flexible steel pipe can not only save costs, but also reduce the damage to the environment.
The rated pressure for flexible steel pipes is ANSI-compliant, by laying a flexible steel pipe over the old pipe and using the API17J classification method and material to protect the bottom of the pipe from external influences.
The flexible steel pipe has a four-layer structure, Flex Steel Conduit And Fittings the innermost 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 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 flexible steel pipe for the rated pressure in line with ANSI classification, Flex Steel Conduit And Fittings such as grade 300 equivalent to 5.15MPa; grade 400 equivalent to 6.89MPa; grade 600 is equivalent to 10.3MPa.
Offshore flexible steel pipe design is based on API17J, 17K and RP17B. The design criteria for flexible steel pipes on land are slightly deviated from the requirements of the API standard. Using the API 17J classification method and materials, the pressure, Flex Steel Conduit And Fittings 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 maintenance structure, to ensure that the inner and outer extrusion molding layers are sealed, Flex Steel Conduit And Fittings and to ensure that the tension and pressure loads are delivered to the tube structure. The samples of the terminal fittings are subjected to blasting and axial tensile tests.