The South-North pipeline connects the existing natural gas pipeline at Gormanston, Co. Meath, with Ballyclare, Co. Antrim. Lagan / Denys JV was awarded Lot B covering the construction of the northern pipeline from Newry to Ballyalbanagh, 75km in length, incorporating 77 road crossings, 4 railway crossings and 10 river crossings.
The scope of work involved all activities associated with the construction and installation of a Natural Gas Transmission Pipeline, at up to 85 bar pressure. These pipelines vary in diameter from 150mm to 600mm.
The works included:
- Laying of High Pressure Steel Gas Mains, in cross country, and suburban environments, including pipe stringing, excavation, negotiation of existing services, ditching, backfilling, reinstatement, and other works.
- Welding of High Pressure Steel Gas Mains, including all welding, radiography, radiographic interpretation, wrapping of joints, pigging of pipelines, hydrostatic testing, and commissioning.
- Construction of Above Ground Installations, including building of skid houses, provision of all ancillary civil services, fabrication of all pipework, tie-ins to mains, testing, commissioning, and other associated works.
- Liaison with all Local Authorities and other parties on an ongoing basis in advance of and for the duration of the construction contract.
- Provision of adequate resources and plant to carry out crossings at special locations, such as Motorways, Canals, Railways, and Major Rivers.
- 2,200,000m2 of topsoil stripping & replacement
- 150,000 meters of right of way fencing
- 21,000 welds of a 450mm dia. pipe
- 190,000m of additional field drainage
- 12,000 setting out pegs