Welding the pipe
- The sections of pipe will be joined together by welds. Welding shelters are sometimes placed over pipe segments so welders can fuse the segments together while protected from wind or weather. Welders use techniques to make the points where the pipes connect even stronger than the steel in the pipe.
- Each and every weld is inspected using an X-ray or ultrasound, and is 100% certified.
Bending the pipe
To match the contours of the land, a pipe-bending machine may be used. It’s a gentle and gradual process that retains the strength and shape of the pipe, but allows the operator to follow the safest, most responsible route.
Coating the pipeline
- To prevent corrosion, special coatings are applied to the pipe, during the manufacturing process. The coatings are formulated to actually bond to the molecules in the steel, creating a powerful shield. The protective coatings are precisely designed for the conditions outside the pipeline. In cases where internal coating is needed to reduce friction, the lining is adhered to the pipe during manufacturing and the welded joints are coated at the site.
- Epoxy coatings are commonly used in North America to protect against water permeation and abrasion from materials in the soil. The coatings bond to steel pipe through a mechanism commonly referred to as polar bonding.
Positioning the pipeline
- The welded pipeline is then gently lowered into the prepared foundation of the trench. Bulldozers using cranes called side booms carefully place the pipeline into the prepared trench bed. The side booms are designed to prevent damage to the pipe and its exterior coating