UOE pipe

"UOE pipe" refers to a type of longitudinally welded steel pipe produced using the UOE (U-ing, O-ing and Expanding) method. This method involves several forming processes, including crimping, U-pressing, O-pressing, and expanding, which are used to produce large-diameter pipes.

The UOE method starts with crimping the edges of a plate to form a U shape, followed by U-pressing and O-pressing to form a J shape. The final step is expanding the J-shaped pipe to form the finished product. This method allows for the production of pipes with up to a 1422mm diameter and wall thicknesses of up to 25.4mm.

The UOE method is known for its high productivity and the ability to produce high quality and large diameter pipes economically. The pipes produced using this method are used in various applications such as oil and gas transportation, offshore structures, and water supply.

Another method used for the production of longitudinally welded steel pipes is the JCOE (J-ing, C-ing, and O-ing) method.

Longitudinal edges of steel plates are first beveled using carbide milling equipment. Beveled plates are then formed into a U shape using a U-press and subsequently into an O shape using an O-press.

Process of UOE pipe

The process of producing UOE pipe involves the following main steps:

1. Trimming: The longitudinal edges of the plate are trimmed by milling to bring the width to the required value, and the ends are beveled to form v-grooves for welding.
2. Pre-bending: The edges of the plate are pre-bent to form a U shape using dedicated forming presses.
3. U-forming: The U-shaped plate is then pressed using a U-forming press to form a J shape.
4. O-forming: The J-shaped plate is then pressed using an O-forming press to form the final round shape.
5. Welding: The edges of the plate are welded together longitudinally to form a continuous seam.
6. Expanding: The welded pipe is then expanded to its final diameter using an expanding machine.
7. Final processing: The UOE pipe is then subjected to various finishing processes, including trimming, end facings, weld testing, and coating, depending on the desired end-use application.

The UOE process is known for its ability to produce large-diameter pipes with high accuracy and consistency, making them suitable for use in the transportation of oil and gas, as well as in various other applications.

The UOE mill features the most advanced technology and process, achieves high production efficiency, stable product quality and is equipped with complete inspection equipments.

UOE mill adopts U & O forming, the formed pipes are welded inside through five internal welding stations with three wires, and welded outside through four external welding stations with three wires.

Specifications

UOE pipes size range:

• Outside Diameter： Φ508mm- 1118mm (20"- 44")
• Wall Thickness： 6.0mm-30.0mm（1/4"-1"）
• Length： 9m-12.3m (30'- 40')

Quality Standards： API、DNV、ISO、DEP、EN、ASTM、DIN、BS、GB、CSA

Grades： API 5L A-X90,GB/T9711 L190-L625

In accordance with different requirements of the customers, the welded pipe can be expanded either by mechanical or hydrostatic expander to improve dimensional accuracy, and eliminate residual stress.

Welded pipes specification and size