Case Study: Offshore Pipeline Survey in Papua New Guinea

Subsea inspection and survey campaign of facilities located in PNG.

Dive Works, as Project Manager
successfully completed an Offshore
Pipeline and Marine Structures Survey
located off the coast of Port Moresby, in
PNG during September and October 2016.

This was the first inspection of the
approximately 400km long pipeline
pipeline and marine structures, since the
as-built survey conducted four years
earlier.

The campaign was conducted from a
single main vessel, Outer Limit and
included specialist services of Bintang
Subsea for survey, inspection, reporting
and CP measurements.

Divided into three phases the project
included a terminal inspection and CP
survey of navaids, fenders and
substructures and offshore and shallow
water pipeline inspection and survey.

Dive Works Observation Class ROVs was
fitted with a CP (Cathodic Protection)
Probe, sonar and manipulator.

Dive Works Work Class ROV was fitted
with a tooling skid which consisted of
boom arm cameras, Lighting. A CP
(cathodic protection) probe we also had a
pipe tracker, in the event the pipeline was in 100% burial the pipe could still be
followed until it came out of burial

In conjunction with the ROVs, Dive Works used a high resolution multibeam
echosounder and sub-bottom profiler
(pinger) as additional tools to complete
the scope of work. Both systems were
mounted on the vessel. Equipment included Dive Works Work Class and Observation Class ROVs, General inspection video and SONAR recording,
bathymetric survey, Multi beam Ecco
sounder (MBES) and CP Inspection.

The jet boat ‘Gannet’ was used to conduct the shallow water survey

• Project duration: 12hr operations, over
  14 days
• Crew on board: 18