Scroll downscroll down button
APA VNIE Looping HDD Support Case Study

APA VNIE Looping HDD Support Case Study

Benefits
Atteris conducted a design and construction review for two HDD crossings for APA. The review provided the Client with an indication of design robustness and also closed-out any gaps that could have potentially affected the integrity of the HDD construction.
Background
APA Group proposed to increase the export capacity of natural gas by adding new pipeline loops parallel to an existing pipeline. The intent was to meet future contractual export capacity in the New South Wales market. The proposed 16-inch pipeline will cross the Ovens River and King River via HDD as part of the new looping scope.
Work Performed by Atteris

Atteris conducted a HDD design and methodology review which included the following:

  • Adequacy of geotechnical data.
  • HDD profile review.
  • Drilling fluid pressure assessment.
  • HDD pull-in forces.
  • HDD construction management review.

Atteris was also involved in the on-site construction and observations throughout the construction operations were recorded. This covered the pilot hole drilling, reaming, borehole cleaning, pipeline pull, coating drain test and pipeline removal processes. It was found out that during the pipeline pulling process, coating damage (scoring and gouging) was observed. Sections with the worst coating damage were cut out and replaced or re-coated. To prevent this from recurring, it was proposed that buoyancy pipes be installed in the pipeline string and flooded prior to pull-in to reduce loading on the pipeline coating system. A fully documented timeline of events including lessons learnt was recorded to assist the client during future HDD operations.

left arrow
right arrow
Download PDF
Share on facebook
Share on twitter
Share on linkedin
resources

Related Posts

Atteris appoints new Houston Business Manager
NEWS
Atteris appoints new Houston Business Manager
Read More
Academy
NEWS
Academy
Read More
Oilsearch Risk Workshop Facilitation
CASE STUDIES
Oilsearch Risk Workshop Facilitation
Read More