Flexible steel pipe is a concept that reflects the difficulty degree of deformation of pipelines, which indicates the ability of pipelines to absorb heat heave, shrink and other displacement deformation through their own deformation.
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, metal bellows is used in the Book of corrugated iron sheet forming, these kinds of pipe axial stiffness is very good, Flex Steel Conduit And Fittings 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 known as flexible piping.
3. Easy transportation and installation. 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.
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. Offshore flexible steel pipe design based on the API 17J, 17K and RP 17B. The design standards for onshore flexible steel tubes deviate slightly from API standards, using API 17J classification methods and materials whose pressure, tensile and destruction limits are within the prescribed range. The test is based on the API RP 17B requirements.