Pipeline flexibility is a concept that reflects the degree of difficulty in the deformation of the pipeline, which indicates the ability of the pipe to absorb thermal expansion, shrinkage and other displacement deformations through its own deformation.
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, rubber material corrugated pipe 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. Flex Steel Conduit And Fittings Glass fiber reinforced plastic sand pipe is made of glass fiber winding, in order to increase the middle of the sandwich sand; rubber (or plastic) material bellows is hot cast molding, 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 pipe wall thickness. Compared with the reinforced concrete pipe, the axial large deformation will not damage the pipeline itself, the maximum axial allowable deformation of the pipe length of 1%, Flex Steel Conduit And Fittings 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 seal instead of using concrete wiping seal, and some do not even make concrete foundation, eliminating the need to wait for the time of life of concrete.
Pipeline due to corrosion and forced to shut down or even out of things often occur, the use of flexible steel pipe repair technology can solve this problem, Flex Steel Conduit And Fittings is a flexible pipe set to the old pipe. Flexible steel pipe repair technology can not only save costs, but also reduce the damage to the environment. The flexible steel pipe has a four-layer 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 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, such as grade 300 equivalent to 5.15MPa; grade 400 is 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, tension and damage limits are within the specified range. The test was carried out in accordance with the requirements of APIRP17B. Flex Steel Conduit And Fittings 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, 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. Canada has a pipe with a length of 2km and a pipe diameter of 6in, which has been shut down due to corrosion problems. The pipeline of the pipeline to go through 5 to 6 landowners of the zone, apply for the construction of a new pipeline is particularly difficult, therefore, decided to repair the pipeline. Wellstream's repair method is to use a flexible steel to the old pipe, so you can not apply for the purchase of new pipes, significant savings in spending and reduce the damage to the environment. The repair line is used to deliver liquid carbon dioxide into the injection well to increase oil recovery. There are two 90 ° turns and a road crossing at the place leading to the wellhead. Pipe through the operation before the clearance, Flex Steel Conduit And Fittings removal and other obstacles to work.