The pipeline services company performed what it called a successful Stopple Train pipeline pressure intervention there.
This made it possible for Denmark's primary gas transmission pipeline, run by Energinet.dk, to be re-routed, allowing the Copenhagen-Ringsted railway to be constructed.
The pipeline, which runs from a Danish offshore platform in the North Sea to Goteborg, Sweden, was successfully relocated without incident and without interrupting the gas supply.
To ensure a continuous pipeline, pressure had to be kept at 870 pounds per square inch.
The TDW team used a hot-tapping machine to tap the 762mm pipeline, two 762mm Stopple Train plugging systems to plug the line and Lock-o-ring plus fittings to seal the entry points created by the hot taps.
A temporary 406.4mm bypass line was installed to maintain gas flow.
Due to the linked double-plugging heads and bleed port, the Stopple Train system offered the operator greater sealing capacity during the operation, along with increased safety.
This helped ensure the protection of technicians welding in close proximity to the isolation joints.
Lock-o-ring Plus fittings were used for post-operation sealing to eliminate potential leak paths.
With the pipeline successfully isolated, it could be safely cut to be relocated.
For three weeks the line was safely isolated at a pipeline pressure of 870psi, during which times the relocation works took place.
The existing section of the pipeline was safely removed and the new section installed, clearing the area for the Copenhagen-Ringsted line.
Adding to the difficulty, the section was in the small town of Broendbyvester, a residential community with a major football stadium.
TDW Europe/Africa/Middle East project manager Alexandre Flamand said the company was acutely aware of the difficulties.
"In preparation we worked closely with the Energinet.dk team on a detailed plan of action that was based on in-depth analysis of the risks posed and the necessary steps that needed to be taken to address them," he said.
"From the outset we forged a very solid team that cooperated and communicated extremely well."
