
Roller Leveler
The coil end is fed into the roller leveler which flattens the skelp for further processing.

Sizing Mill
The pipe proceeds to the sizing mill for final OD sizing.














Hydrostatic Tester
Every length of pipe undergoes a hydrostatic test as a strength and leak check.

Final Inspection
A final visual inspection is preformed on the pipe prior to shipment as an additional quality control measure.

Facing and End Finish
Following galvanizing, if ordered, the pipe is faced, beveled or threaded and coupled.

Rotary Straightener
The pipe is cut to finished length, straightened and visually inspected.

Cut-Off Saw
The flying cut-off saw cuts the pipe into double lengths.

Stretch Reducing
The pipe passes directly from the welding rolls to a stretch reduction mill, where the OD is reduced and the desired wall thickness is obtained.

High Frequency Welder
The high frequency welder heats the edge of the strip to approximately 2600°F at the fusion point. Pressure rolls then squeeze the heated edges together to form a fusion weld.

Forming Rolls
The skelp proceeds through forming rolls that bend it into an oval with the opening facing downward and is then passed on to the welding stand.

Flash Welding
Next, the leading coil end is fed into the flash welder where it is welded on to the trailing end of the preceding skelp coil. This process delivers a continuous strip of skelp to the mill.

Skelp Loop
End welding completed, the skelp to the floor on edge on edge and formed into a large loop.

Shear Trimming
Before welding, an up-cut shear trims the ends of the skelp square.

Coiled Skelp
The process begins with coiled skelp being loaded on to the uncoiler feed table. It is then advanced by the coil pusher to the uncoiler box.
How Pipe Is Made
Electric Resistance Weld (ERW) - Stretch Reduced Process