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First Gas Limited (FGL)

111-Line Piggability

Scope

The 111 Lateral pipeline supplies natural gas from the Waitangirua Delivery Point (DP) to the Tawa A and Tawa B gas DPs in Wellington. The line has known coating defects and is consequently operated at a reduced pressure of 18 barg pressure.

Project Summary

The pipeline was last DCVG surveyed in 2009: 156 coating defects were identified. As per AS 2885.3, the use of intelligent pigging inspection (ILI) is required as the preferred minimum inspection technique. In previous experiences, ILI inspection of the 100 Line has found ~200 corrosion metal loss sites.

Verbrec’s Role

Design and install permanent pigging facilities for ILI tools including a pig launcher at Waitangirua DP and a receiver at the Tawa A DP
Preparation and planning for the site work
First Gas supervision and permitting of the site works

Location

Waitangirua – Wellington

Date

2016-2017

Ichthys Onshore Gas Pipelines

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