Flexible steel pipe has four-storey structure, the most internal layer is extruded thermoplastic pipe, in the transmission of liquid in the sealing role; the middle two-layer liner is filled with carbon-lined polyethylene tubing, which has the ability to withstand long-term ultraviolet radiation and can exclude external static. Flex Steel Conduit And Fittings The outer layer is a thick external shield that is extruded to protect the bottom of the pipe from external influences. Standard flexible steel pipe suitable for the nominal pressure of the ANSI classification, such as level 300 equivalent to 5.15MPa; grade 400 equals 6.89MPa; grade 600 equals ten. 3MPa.
The design basis of offshore flexible steel pipe is api17j, 17K and rp17b. The design standard of flexible steel tubes on land deviates slightly from API standards, using API17J classification methods and materials, the pressure, tensile force and damage limit are all within the prescribed range. The test was conducted in accordance with the apirp17b requirements. Flex Steel Conduit And Fittings The design of the terminal accessory can satisfy the integrality of the maintenance structure, ensure the sealing requirement of the inner and outer extruding forming layer, and can guarantee the transfer of the tension and pressure load to the pipe structure. The sample of the terminal accessory is tested by blasting and axial tensile force.
Canada has a long 2km, pipe diameter of 6in pipeline, Flex Steel Conduit And Fittings due to corrosion problems were shut down. The pipeline is going through 5 to 6 land owners, and it is particularly difficult to apply for a new pipeline, so it is decided to repair the pipeline. Wellstream Company's repair method is to use a flexible steel to the old pipe, so that it can not need to apply for new pipe purchase, greatly saving costs, Flex Steel Conduit And Fittings and reduce the damage to the environment. The repair pipeline is used to transport liquid carbon dioxide into the wellhead to increase production. There are two 90° bends and a road crossing at the wellhead. The pipe should be cleared and removed before the work is put into operation.
Material properties of flexible steel tubes
Although flexible tubing has many different classifications depending on the material, it has the following characteristics:
1. Strong corrosion resistance. FRP pipe, Flex Steel Conduit And Fittings rubber material corrugated pipe non-metallic material, strong corrosion resistance, metal coil corrugated pipe galvanized layer also has a good corrosion resistance.
2. Good pipeline flexibility. Glass fiber reinforced plastic sand pipe is formed by filament winding, in order to increase the stiffness sandwiched between the gravel; rubber (or plastic) material corrugated pipe is a hot cast, some varieties in the middle with metal wire skeleton, Flex Steel Conduit And Fittings metal bellows is used in the Book of corrugated iron sheet forming, these kinds of pipe axial stiffness is very good, the stiffness value with the pipe wall thickness and increase. Compared with the reinforced concrete pipe, the axial larger flexible deformation does not destroy the pipeline itself, the maximum axial allowable deformation is 1% of the pipe length, the maximum radial allowable deformation is 5%, and (the manufacturer provides the value) can adapt to the weak foundation well. It is also called flexible steel pipe.
3. Easy transportation and installation. Flex Steel Conduit And Fittings Pipeline production length of $number meters, or even longer, less interface, so the installation duration is short.
4, the interface construction operation time is short. The use of mechanical, physical, chemical method seals instead of concrete tape seals, Flex Steel Conduit And Fittings some even do not make concrete foundation, to save the waiting time for concrete health.