HDD long distance record in Scandinavia
Mar 28, 2014
Trenchless installation of pipelines
Top performance at minus 27 degrees Celsius
The first hole for the drinking water pipeline led from the shore to the bottom of the lake. There, the pipeline had to be connected to a conventionally laid pipeline, thus creating a link to the opposite shore. After only 2 days of drilling, the 700 meter long pilot was completed at the bottom of the lake. Then the weather changed dramatically. The temperature fell by more than 25 degrees and the general contractor SVEAB was suddenly faced with a frozen lake with a decimeter thick ice layer. "We fought against the ice for a total of two weeks, 24 hours a day. Day and night up to four boats were working on the lake as ice-breakers" recalls Magnus Tingstrand from BAB Rörtryckning AB. The boats had to break through the ice to be able to lift the pilot head, change it for a reamer and to connect the pipe which also was frozen into the ice. The effort was worth it – the 28-inch pipeline was installed safely in time for Christmas.
A result which is pretty impressive. The core part of the new supply and disposal lines for the Norrtälje community was completed after only three months. The completion of the entire project is scheduled for 2015.
HDD - Horizontal Directional DrillingThe HDD method (Horizontal Directional Drilling) is a worldwide tried-and-tested technology for the underground installation of pipelines. In a first step, a pilot drill is driven from the launch to the target point. In a second step, the pilot hole is widened in the opposite direction by a so-called reamer. The reaming is often repeated several times depending on diameter and geological ground conditions. In a last step, the pipeline is inserted into the reamed bore hole. HDD rigs from Herrenknecht are used worldwide to install oil and gas pipelines as well as water and wastewater pipelines with diameters of up to around two meters (80 inches) - rapidly, cost-efficiently and causing low impact on the environment.
|Project data||Machine data|
|Location||Norrtälje, Sweden||HK150C Crawler Rig|
|Application||Wastewater; drinking water||Pipeline diameter||
Wastewater: 2x 355mm (2x14 inches "Double Pack")
Drinking water: 710mm (28 inches)
Drinking water: 700m
|Pulling force||1,500kN, 150t|
|Client||SVEAB||Contractor||BAB Rörtryckning AB|
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