AMS No-Dig Case Studies

Sizewell nuclear power station Click image to enlarge

Project Name: 132kv Cable Circuits, Sizewell B power station The contract: Commissioned by SEESA and Magnox South, the works involved the installation of 4 x 132kv cable circuits from the main Sizewell power station to a new power station currently under construction. The purpose of the work was to connect the existing power station to the new power station which will take electricity from the Greater Gabbard off shore wind farm which is due to go into service in 2012. The project: The project was to fabricate and install 5 way 180mm hppe duct configurations under areas of engineering difficulty along the cable route. In all, a total of 12 drills were carried at three locations each ranging from 60m to 380m in length. The scheme presented a number of high risk implications: crossing under wetlands, forested areas, streams and the Sizewell B access Rd. See full project information and pictures

6.75 inch mud motor fitted with 9.87 inch tricone bit Click image to enlarge

Project Name: Franklaw to Barnacre 630mm Water Improvement Scheme The contract: Commissioned by United Utilities, the aim of the scheme was to lay a new potable water main from Franklaw water treatment works (WTW) to Hoghton reservoir as part of large diameter pipe cleaning enabling works. In total 6km of pipe had to be installed between the WTW and the reservoir by a combination of open cut and horizontal directional drilling (HDD), with HDD used to negotiate two areas of engineering difficulty. The project: Balfour Beatty Utility Solutions Ltd commissioned AMS No-Dig in 2008 following a competitive tender process. The project involved horizontal directional drilling under the River Wyre, The Avenue and a farm access road installing a 630mm HPPE water main. The length of the crossing from entry to exit point was originally 270m. In addition a further 150m of 630mm HHPE was drilled under a factory forecourt. See full project information and pictures