June 2019 Vol.74 No. 6

Rehab Technology

Rehab Method Protects Pipeline Seams from Corrosion—and Floats

For the rehabilitation of a drinking water pipeline in the district of Aalen, 124 miles northeast of Munich, Germany, the DENSO Group Germany protects weld seams from corrosion quickly and efficiently using a new laying method that floats in water.

The drinking water pipeline is one of the region’s main arteries. One of the two steel pipelines, with a nominal diameter of DN 1200, was restored for long-term use. Water flows through two parallel tunnels over almost at 475 gallons per second.

For this method, the pipeline was first laid in the water. Just 10 minutes after applying the DENSOLEN-AS50 tape system to the weld seam, the pipe was pushed into a tunnel flooded with water. The pipeline was then drained four months later.

Direct flooding and extended operation in water are major challenges for field joint applications.

This unprecedented method overcame the challenges in the following ways:

  • The three-ply DENSOLEN tapes fuse together very rapidly.
  • A diffusion-resistant protective hose is quickly generated, with reliable performance, even when permanently exposed to fluids.
  • The single-tape system was applied in at least a three-layer wrapping using the engine-driven DENSOMAT-11 application device.•




DENSO Group Germany, +49-(0)214-2602-0, denso-group.com; dekotec.com/en/

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