The spiral seam submerged arc welded steel pipe is rotated and drilled and begins to enter the soft formation. Under the action of the three-cone wheel, the drill bit first produces elastic shear deformation of the formation and then is removed under the pressure of the three-cone wheel. In the simu

The spiral seam submerged arc welded steel pipe has a uniform wall thickness, looks good, is evenly stressed, and is durable. The spiral seam submerged arc welded steel pipe has uneven wall thickness and uneven stress on the steel pipe. The thin parts of the steel pipe will easily break. The uneven

1. Under the condition of not affecting the welding of the nozzle, the reserved length of the epoxy powder at the end of the polyethylene layer should be appropriately increased to prevent the 3PE anti-corrosion warping caused by the long stacking time of the steel pipe and the serious metal corrosi

1. Long-term over-temperature burst tubeOver-temperature refers to metal materials operating at temperatures exceeding the rated temperature. The rated temperature refers to the allowable maximum temperature of the steel during the design life, and can also refer to the rated temperature during oper