Pukearuhe Pipeline LoC Remedials


Client: First Gas Limited (FGL)
Location: New Plymouth, North Taranaki
Scope: Pipeline Remedials
Date: 2016-2017
Project Length:


Oil & Gas

OSD’s Role

  • Installation of retaining wall structures at pipeline ends above/below ground interface
  • Construction of surface contour drains
  • Installation of buried subsoil drains, drains, MH and Sumps
  • Construction of a concrete pipe support structure
  • Excavation of the pipeline to remove existing backfill materials
  • Removal of the existing coating on the excavated section of pipeline and recoating
  • As-built survey of the pipeline location, coating and drainage


The DN750 Oaonui-Rotowaro Gas pipeline (known as the 400Line) runs along the coastal strip in North Taranaki. The pipeline was subjected to a Loss of Containment (LoC) event in October 2011. Following this an initial repair replacing a section of DN400 pipe took place and included coating repairs before backfilling the pipeline.

The re instatement project retains the asset as a permanently above-ground facility. This involves full excavation of 45 metres of pipeline; installation of one concrete plinth and an inspect-a-lift pipe support; re-coating work; associated drainage; installation of retaining walls and permanent batters of trench.

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