I.- CONTINUOUS FORMING: A) ERW (ELECTRIC RESISTANCE WELDING) By this process pipes are manufactured, it begins with the edge trimming of the steel plate or coil to the width required. Afterwards to enhance its dimensional characteristics, the pipe is work through sizer section. High Frequency Electric Resistance Welding is used and a heat treatment of the weld, (ERW- Electric Resistance Welding) is applied for diameters from 6 5/8" to 30". In the finishing area, the pipe is submitted to a hydrostatic test, non-destructive testing is applied, including visual and dimensional inspection, according with the specification required by the client.
	B) DSAW (DOUBLE SUBMERGED ARC WELD) For diameters from 18 inches and over, the process of Double Submerged Arc Weld can be used. This process applies an inner and outer seam to the pipe (DSAW-DOUBLE SUBMERGED ARC WELDING). Afterwards to enhance its dimmensional characteristics, the pipe is cold expanded approximately 1%. In the finishing area, the pipe is submitted to a hydrostatic test, non-destructive testing is applied, including visual and dimensional inspection, according with the specification required by the client.
	II.- PYRAMIDAL ROLLING By this process pipes are manufactured in diameters from 20 to 150 inches, and in wall thicknesses from 0.250 to 2.5 inches. The process begins with the edge trimming of the steel plate to the required width. The pipe is formed by pyramid rolls to later be welded by the Double Submerged Arc Welding process. In the finishing area, the pipe is inspected and tested to guarantee the quality required by the client.