The 250 mm diameter electricity cables were buried 6-8 meters deep into the ground, transitioning from the North Sea to a pipe casing. Each cable was pulled into a large PE d800 casing pipe for thermal expansion regulation, cable pulling, and future maintenance. Using HDD drilling (Horizontal Directional Drilling), contractor Van Vulpen, belonging to the division of the NRG-Group, installed a kilometer-long casing pipe by creating a horizontal drill hole. The cables were pulled onto the land and threaded through the casing pipe using a protective funnel attached to the flange. To securely seal the pipes, a two-part cover plate with a rubber seal was finally installed. This procedure effectivly prevents sand infiltration.

Thanks to the availability of the big sized couplers, the timely completion of this large-scale project was made possible. Significant infrastructure projects require adherence to timelines and easy installation of components. MULTI/JOINT® met all those requirements and was choosen over the conventional method of welding a PE stub flange with a backing flange to the PE casing pipe.

MULTI/JOINT® is typically used in water and gas systems but proved to be a quick and versatile application for this unqiue project. The DN800 MULTI/JOINT® flange adaptor offers the benefit of easy connection between the funnel and flange, saving valuable engineering time. With its wide range and restraint features, thrust blocks become unnecessary, resulting in a quick and smooth installation. Moreover, the cover plate could easily be mounted onto the MULTI/JOINT® flange fitting. Installers confirmed their satisfaction with the solution provided by MULTI/JOINT® and expressed their intention to use it more frequently in future projects.