New ptj Issue 2-2019
Pipeline Safety & Operation
The new PALIMEX®-880/-855
The two-tape system reliably protects your pipeline – and saves your budget.
Learning from Failures: Moving from ‘Failure’ Cause to ‘Root’ Cause
Phil Hopkins >>> Phil Hopkins Ltd.
Nonintrusive Pipeline Internal Deposition Mapping Provides Insight to Operators
Keith Drummond / Thomas Redares >>> Halliburton
Pipeline vibrations – Measurements under difficult conditions
Dr. Patrick Tetenborg / Dr. Christian Jansen >>> KÖTTER Consulting Engineers
The challenge of descaling and extending pipelines lifetime
Luca Reinhart >>> Reinhart Hydrocleaning
Where Technology meets Nature: a unique approach to ban illegal tapping
Kristof Verwaest >>> The Sniffers
Revolutionising Pipeline Safety: Intelligent Weldment Inspection Decision System
Mohd Nazmi bin Mohd Ali Napiah / Hambali bin Chik >>> PETRONAS

DENSO uses new laying method in water for pipeline protection

Reliable pipeline protection with DENSO: New laying method in water

For the rehabilitation of a drinking water pipeline in a district 200 km north-east of Munich, Germany, DENSO managed to protect weld seams from corrosion quickly and efficiently using a new laying method that floats in water.

For this method, the pipeline was first laid in the water: Just ten 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. This is impressive as pipelines are normally not immediately and permanently exposed to corrosive media. The test results provided by the Remote Water Supply Association prove: The standard requirements of DIN EN 12068 for a high-quality protection of the weld seams are satisfied.

Direct flooding and extended operation in water are major challenges for field joint applications. This unprecedented method shows: 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.

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 two kilometres at 1,800 litres per second. The construction measure is expected to be completed in the spring of 2019.

Comments

This is a very important issue for our communities. Maintaining the operating integrity of water system and preventing corrosion in pipes and fixtures can help prevent serious health hazards as well as reduce the high cost to repair or replace down the road.

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