In order to meet the growing demand for natural gas by consumers within Northern Victoria and New South Wales, APA GasNet Australia (Operations) Pty. Ltd. needed to expand its capacity by looping the existing 300mm (12 inch) Wollert to Wodonga Pipeline (PL 101) with a new 400 mm transmission pipeline in APA’s existing 35 metre wide gas pipeline easement.
APA engaged Nacap Australia Pty. Ltd. to deliver Stage 2 of this critical project (Sep 2014-May 2015). Nacap’s role was to provide pipeline construction services to the Victorian Northern Interconnect Expansion Project (VNIE) – Wandong to Broadford and Mangalore to Glenrowan Pipeline Looping. Construction involved a mix of traditional cross country pipelining, special sections, crossings and trenchless construction methods.
Key challenges for this project included an extremely short start-up and strict financial requirements, leaving little room for error. To meet downstream users, regulatory approvals and land access constraints, the project had to be completed in a disjointed manner, rather than a traditional one way pipeline construction from A to B. There were also safety challenges due to the works being performed only seven metres from an operating high pressure gas pipeline.
Additional challenges included management of social and environmental impacts due to watercourse, freeway and railway crossings, extensive landowner management and numerous high value cultural heritage sites.
Increasingly variable weather conditions and a rapid mobilisation of a workforce in excess of 300 and large fleet of equipment overlayed these challenges. Construction was to occur in a rural/sub-urban environment at an average rate of progress of 2400m/day.
Despite these complexities and in line with its performance over the last 30 years, Nacap delivered the project on time and within budget, to the satisfaction of its client, APA. Nacap’s values – integrity, teamwork and strive to be better – are what we live by and these values have ensured outstanding safe and effective outcomes for our clients, people and the environment.
First time pipeline built in Victoria at rate of 2.4km per day
Non-traditional sequence with construction over three separable portions
Works performed only seven metres from an operating high pressure gas pipeline
130 Safe Work Methods developed, zero LTIs
Rapid mobilisation of a workforce in excess of 300 and large fleet of equipment due to short start-up phase (one month) to meet short summer window period
Extensive use of pipeline padding machines which eliminated the need to import bedding material (in the form of sand) for pipeline backfilling operations
Introduction of a ground breaking online safety portal