Comparison of UOE and JCOE Pipe on Specification and Efficiency

(1) Diameter and Wall thickness
JCOE can produce pipe diameter and wall thickness greater than the UOE, which is produced by the two molds and production processes of the decision. For UOE, a set of O machine mold can only produce a diameter of the pipe, and is the second process to complete the molding, pressure on the molding unit demanding, so UOE can produce a smaller diameter and wall thickness range. For JCOE, steel pipe forming is taken by bending machine step forming the bending pressure required to greatly reduce, so the power requirements of the unit greatly reduced. Therefore, in the case of the same unit pressure, JCOE can produce a greater range of wall thickness, and a set of molds can produce a variety of pipe diameter, pipe diameter can produce a greater range. Baosteel O forming machine pressure reached 72000t, is the world's largest pressure O forming one of the production wall thickness can reach 40mm. From the current domestic and international development of pipeline steel technology, high steel grade, thin wall thickness is an inevitable trend in the development of pipeline, the West-East second-line use of the φ1219 steel pipe is the largest diameter steel pipe, UOE production capacity is large enough margin , So the current Baosteel UOE diameter and wall thickness of the production range can meet the needs of pipeline engineering.

(2) Production efficiency and capacity
UOE production efficiency and production capacity to be significantly higher than the JCOE, UOE is about 3 times the JCOE. A UOE line can produce about 6 km of pipe per day, JCOE production line can only produce about 2 km per day. UOE using U molding and O molding can be completed in two steps, and JCOE using step bending machine, usually after more than 20 bend to shape, so the production efficiency is much lower than the UOE. UOE more suitable for the production of a single specification, high-volume products, and JCOE more suitable for production of multi-standard, small-volume products. So for some of the more stringent requirements on the duration of the project, UOE high productivity compared to JCOE has a greater advantage.