The Flooded Member Detection (FMD) System is a specialist subsea NDT tool used to determine whether tubular structures are dry, partially flooded, or fully flooded. Designed for both Diver and ROV operation, this system provides rapid, reliable integrity checks on offshore jackets, braces, caissons, conductors and riser guides—without the need for intrusive or cutting methods.
Using proven ultrasonic and acoustic technology, the FMD system enables operators to confirm internal conditions within subsea members from 0.5 m to 10 m detection range. This supports life-extension programs, structural integrity assessments and class compliance for oil & gas, renewables and marine infrastructure.
Diver-Operated System
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0.5 MHz subsea ultrasonic transducer
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200 m umbilical for diver deployment
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Ultrasonic electronics unit
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Rugged laptop computer with RSL Software
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RS232 output
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Detection range: 0.5 m – 10 m
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Power: 110 / 240 VAC
Ideal for close visual inspection (CVI), diver-based NDT campaigns and targeted integrity checks.
ROV-Operated System
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0.5 MHz subsea transducer
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Subsea electronics pod (200 × 75 mm)
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Rugged laptop computer with RSL FMD Software
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Power to subsea electronics: 24 VDC
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RS232 output
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Detection range: 0.5 m – 10 m
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Depth rating: 2,000 m
Suitable for deep-water structures, unmanned inspections and integration with light and work-class ROVs.
Why FMD Is Essential
Flooded Member Detection is a key component of offshore asset integrity management. It enables operators to:
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Identify flooded, partially flooded, or dry structural members
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Reduce risk of structural failure caused by internal corrosion or collapse
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Support class compliance and life-extension programs
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Prioritise maintenance, repairs, and inspection campaigns
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Reduce operational downtime and minimise intrusive work
Using non-intrusive ultrasonic technology, delivering fast, accurate results that help asset owners make informed decisions and optimise inspection budgets.
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