Non Destructive Testing & Inspection Reports

Flooded Member Detection Services (FMD)


As offshore structures get older there is a need for a method of economically detecting subsea component failure. FMD is such a method – it determines whether a structural component is flooded, partially flooded or dry. FMD identifies where components have through-wall defects, whether caused by damage or fatigue. FMD is reliable, rapid and more cost-effective than conventional diver and ROV inspections. Additionally, FMD can deliver immediate and repeatable results and can be performed by either ultrasonic or radiographic techniques.

The advantages of the radiographic techniques are that it is significantly quicker (no requirement to remove marine fouling) than ultrasonic methods. Dive Works utilises the “SureFlood” system, which is a state-of-the-art gamma radiographic system and incorporates the latest technology and inspection developments.

Cathodic Protection (CP)


A cathodic protection (CP) system protects an infrastructure asset such as a subsea pipeline, marine pile, offshore platform or other metallic structure from corrosion.

Corrosion is a leading cause of premature failure in metallic structures. Operators can extend the service life of their facilities and equipment by installing cathodic protection systems (CP systems) and testing them regularly.

Dive Works provides CP system monitoring via an ROV mounted CP monitoring probe. The CP monitoring probe enables readings of the cathodic potential of a subsea structure to be taken, enabling an inspector to determine the effectiveness of the system.

The CP monitoring probe also enables the ability to determine if anodic protection is working correctly and help identify unprotected areas on subsea structures.

Sub Sea Cathodic Protection Survey (CP Survey)


Dive Works has both contact and proximity probes and  operates a proprietary technology that can do CP through concrete weight coat.

Dive Works can also undertake trailing wire CP surveys. This method provides quick cost-effective method to gain information on the general condition of the pipeline’s CP system and is particularly useful when undertaking surveys of inshore and buried pipelines.

Field Gradient: the CP-DAS system, deployed by ROV is used to inspect the condition of offshore pipeline cathodic protection systems. Two high purity Ag/AgCl half cells are housed within a contact probe body, allowing contact and continuous potential & field gradient measurements to be taken. The raw analogue cathodic potentials from each of the cells are converted to a digital output. The data conversion is undertaken in a sub sea electronics pod, which is rated to 3000 msw depth. Data can be transmitted using either RS485 or RS232 protocols via the available ROV multiplexor.

 

Underwater Thickness (UT) Readings


Ultrasonic thickness gauges use acoustic echo techniques to determine the thickness of structures and materials underwater.  This involves the generation of a sound wave, and the measurement of time taken for a far side echo’s to pass through the material of the structure under test.  Measurement data is transferred from the ROV mounted probe up to the surface via the ROVs umbilical cable. Dedicated software displays the measurements and logs all test data.

Typical applications include deep water pipeline inspection, ship inspections, lock gate, pier and piling inspections.

Key Features


  • Measures metal thickness to determine wastage or corrosion, accurately, quickly and without removing surface coating.
  • Dedicated software displays the time, date and thickness readings on the surface and all of these measured results can be stored.
  • Designed specifically for metal thickness and corrosion checks on all steel structures and pipelines.
  • Greatly reduces inspection time and cost.
  • Measures on rough corroded surfaces.
  • Range of thickness equals 1mm to 250mm thickness.
  • Fast, accurate and reliable readings.

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Dive Works Subsea Solutions utilise a fleet of world class Remote Operated Vehicle’s (ROVs), commercial divers and project management expertise to deliver a suite of innovative technology-based subsea solutions to clients in Australia and South East Asia. Contact us today to discuss your next subsea project.