Dutch horizontal directional drilling (HDD) specialist Visser & Smit Hanab has collaborated with a collection of European contractors to complete a ground breaking project, using wash boring to replace a damaged pipeline underneath the Spree River, Germany. In 2015, LEAG – or Vattenfall Europe Mining AG as it was known at the time – awarded a contract to TrappInfra Rohbau Welzow GmbH for the construction of a large-diameter, twin-pipe culvert underneath the Spree River in Germany. It was decided that trenchless methods would be utilised for the installation of two large-diameter polyethylene (PE) pipes. The pipes had respective outside diameters (OD) of 1,400 mm and 1,200 mm, and were supplied by FRANK GmbH and manufactured by AGRU Kunststofftechnik GmbH. Dutch contractor Visser & Smit Hanab completed the HDD on the project, before the pipe was installed using the wash boring process. According to AGRU, this was the first time, anywhere in the world, that PE100 pipe had been installed using this method. Located near Spremberg, Germany, the Schwarze Pumpe power station had a nominal capacity of 1,600 MW, with brown coal for the station excavated in the nearby open cut min...