Medium-Diameter Welded Pipe Production Units (8-26 inches)
Medium-diameter welded pipe units initially used the two-roll forming method, but after the introduction of the cage roll forming method in the 1970s, it became the dominant process. By the 1990s, with the exception of five 12-inch units built by Taiwan's Geng An Co. (still using two-roll forming) and two 8-inch units supplied by Japan to the US and Europe (using FF forming), nearly all other units adopted cage roll forming.
Main Cage Roll Forming Processes
Full cage roll forming
Semi-cage roll forming
Straight flange cage roll forming
Major Equipment Manufacturers
France's DMS
Austria's VAI
Germany's SMS-Demag
In the past five years, all five newly built ERW (Electric Resistance Welded) pipe mills worldwide were supplied by these three companies, primarily producing line pipes, structural pipes, and casing pipes.
