Structural characteristics of DN1000 rigid through-wall casing

DN1000 rigid through-wall casing has a four-layer structure. The inner layer is an extruded thermoplastic tube, which plays a sealing role in transmitting liquids; the middle two layers are lined with a carbon-filled polyethylene tube, which has the ability to resist long-term exposure to ultraviolet radiation and to exclude external static electricity. The outer layer is an extruded thick external shroud that protects the bottom layer of the tube from external influences.DN1000 rigid through-wall sleeves are suitable for rated pressures in accordance with ANSI classifications, such as Class 300 equivalent to 5.15 MPa; Class 400 equivalent to 6.89 MPa.
 
The design of DN1000 rigid through-wall casing is based on API17J, 17K and RP17B. The design criteria for DN1000 rigid through-wall casing deviates slightly from the requirements of the API standard, using the API17J classification method and materials whose pressure, tensile strength and damage are within the specified range. Tests were conducted in accordance with APIRP17B. DN1000 rigid through-wall sleeves were designed to meet the requirements of maintaining structural integrity, ensuring the sealing of the internal and external extruded molding layers, and ensuring the transfer of tensile and pressure loads to the pipe structure.
Samples of DN1000 rigid through-wall casing were subjected to bursting and axial tension tests. When shearing DN1000 rigid through-wall casing, it should be adjusted according to the various ground stresses of DN1000 rigid through-wall casing. DN1000 rigid through-wall casing gap affects the size of shearing force of DN1000 rigid through-wall casing and the service life of DN1000 rigid through-wall casing. Gaps can lead to increased burrs in DN1000 rigid through-wall casing and produce secondary shear sections. Excessive decoration is not cut according to the design scheme.
 
When shearing and processing DN1000 rigid through-wall casing, excessive shearing will be carried out according to the specifications and structural requirements, which will lead to ground stress damage to DN1000 rigid through-wall casing and may also damage the specifications of DN1000 rigid through-wall casing. When choosing the extrusion method, the better extrusion method of stainless steel profile should be selected according to the profile shape, the structure of DN1000 rigid wall casing, the amount of residual material, the method of separating residual material and products, the utilization coefficient of welding volume, the quality of the profile, the force conditions and the metal flow rate and other indicators.