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South North Pipeline

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.

Key Features

  • 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
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