Flexible steel pipe structure has four layers, the most inner layer is extruded thermoplastic tube, the middle two layers of lining is filled with carbon polyethylene tube, with long-term resistance to ultraviolet radiation. Finally, the extruded outer shield is used to protect the bottom of the tube from external influences. Flex Steel Conduit And Fittings Standard flexible steel pipe for the rated pressure in line with ANSI classification, flexible steel pipe design standards slightly deviate from the API standard requirements, the use of API 17J classification methods and materials, the pressure, tension and damage limits are in line with the provisions. The tests were carried out in accordance with API RP 17B requirements.
The terminal fittings are designed to meet the integrity of the maintenance structure, Flex Steel Conduit And Fittings to ensure that the inner and outer extrusion molding layers are sealed, and to ensure that the tension and pressure loads are delivered to the tube structure.
Material properties of flexible steel tubes
Although the flexible pipe according to the different materials have many different classification, but its common are:
1, strong corrosion resistance. Glass fiber reinforced plastic pipe, Flex Steel Conduit And Fittings corrugated rubber material is a non-metallic materials, corrosion resistance; metal coil corrugated pipe galvanized layer also has good corrosion resistance.
2, the pipeline is flexible and good. Glass fiber reinforced plastic sandwich tube is made of glass fiber wound, in order to increase the middle of the sandwich sand; rubber (or plastic) material bellows is hot cast type, some varieties in the middle with metal wire skeleton, metal bellows is book metal Curl molding, the axial stiffness of several kinds of pipe is very good, the stiffness value increases with the wall thickness of the pipeline. Compared with the reinforced concrete pipe, the axial large deformation will not damage the pipeline itself, Flex Steel Conduit And Fittings the maximum axial allowable deformation of the pipe length of 1%, the maximum radial allowable deformation of 5%, (manufacturers to provide value) can be a good fit Weak foundation. So it can also be called flexible steel pipe.
3, transport installation is simple. Pipeline production length of 6 to 8 meters, or even longer, less interface, so the installation period is short.
4, the interface construction time is short. The use of mechanical, physical, chemical method of sealing instead of using concrete wiping seal, and some even do not make concrete foundation, Flex Steel Conduit And Fittings eliminating the need to wait for the time of life of concrete.
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. Flex Steel Conduit And Fittings The design standard for flexible steel pipes on land is slightly deviated from the requirements of the API standard; grade 600 is equivalent to 10.