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Flooded Member Detection by gamma source allows for offshore platform members to be inspected for flooding as a result of cracking, damage, corrosion or weld defect, without the need for high levels of cleaning required by other methodologies. As such, a more tailored inspection plan can be prepared for more detailed investigation as well as other inspection tasks and techniques.

The PMAC ROV-mounted FMD system uses a range of small radioactive sources to cover member sizes from 150mm up to 3m diameter. The ROV mounting frame is variable to allow for members at any angle to be tested. Our proprietary software package analyses and records the data quickly and efficiently allowing for production of a report within hours of completing a work scope and single member results within minutes.

​The ROV-mounted FMD system operates on the principle that a collimated beam of radiation is transmitted through the member and received by the detector at the other side. The strength of the received beam is compared with computer predic-tions for a dry or flooded member.

Laboratory and In-Field Technologies for Scale, Wax, Corrosion and Microbiology   

Our FMD technicians hold SEPA Radiation Protection Supervisor qualifications as well as other regulatory requirements for the region of operation to assure safety. FMD Technicians may also hold other qualifications such as CP or CSWIP, enabling them to fulfil multiple roles on a vessel, saving on time, bed space and ultimately, cost.

Cathodic Protection (CP) and Flooded Member Detection (FMD) surveys of Subsea Pipelines and Structures

The advantages of the system include, but are not restricted to, the following:-

  • ​Survey is fast (can exceed 30 components per hour!) and the resulting assessment is instant and unambiguous.
  • ​Prior removal of marine growth is unnecessary
  • ​May be safely and effectively deployed by ROV or Diver
  • ​A proven system with an impressive track record since 1991
  • ​​The most cost-effective FMD / FMI system available
  • Configured for survey of horizontal or vertical components


System Capabilities / Practical Uses Overview:-

  • ​Detection of water ingress to structural steel jacket members
  • ​Pipeline inspection providing flooded or dry status and the location of 'pigs' or other blockages
  • ​​Leak detection in hydraulic control umbilical’s involving the location and tracking of radioactive 'pigs' or tracers
  • ​​Location and monitoring of gamma emitting equipment or materials 'lost' in a subsea environment.
  • ​Detection and level measurement of fluids in vessels and pipes in a subsea or surface environment.