Neptune Oceaonographics have developed a range of techniques to enable subsea leak detection, and leak detection from subsea installations as pipelines, risers, control systems, etc.

SUBSEA HYDROCARBON DETECTION SYSTEM [More...]

The system uses an underwater gas sensor to detect the presence of methane and other both in gaseous or liquid form (oil). A prime application for the technology is detecting leaks from sub-sea pipelines and installations. The system also has uses in marine accident investigations and forensics. [Learn More...]

FLUORESCENT PIPELINE LEAK DETECTION (FPLD) [More...]

Neptune's FPLD is based around a series of long and short range submersible fluorometers. The sensors respond to a range of fluorescent dyes and can detect very quantities emanating from leaks. The advantage of Neptune's system is the ability to detect very low concentrations in turbid conditions with a high spatial coverage using up to 6 sensors simultaneously.
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This system uses a directional hydrophone in order to 'listen' for leaks from sub-sea systems., sub-sea leaks generate sound within a frequency band. The computer based analytical identifies these leak generated sounds above background noise using a spectrum analyser.
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TEMPERATURE CHANGE LEAK DETECTION (TLD)

Under some circumstances such as water injection flow lines leaks can be identified using the difference between the surrounding and the water leaking from the flowline. The system comprises a fast, high precision thermistor connected through the ROV to a differential temperature display. Any small changes in temperature are clearly seen on the PC display.

For further information on Subsea Leak Detection, click here (PDF Format file, 3mb size)