Cygnus FMD System for Diver

Ultrasonic Flooded Member Detector

Purpose-built for Flooded Member Inspection (FMI), this Cygnus FMD system detects any ingress of water or 'flood' in subsea structural members using ultrasound. This ultrasonic testing (UT) solution boasts clever software and electronics combined with a truly easy-to-use interface to give a clear DRY or FLOODED result.

Once the subsea units are deployed, Cygnus FMD system runs a test using the FMD reporting software at the surface and shows a simple DRY (Green) or FLOODED (Red) result with A-scans for further verification. The results are logged for analysis or reporting as PDF and Excel.


The agile probe handling solution self-aligns with the surface and ensures correct contact with the member – regardless of what angle or direction of approach.

A simple DRY / FLOODED result is displayed and logged at the surface on the reporting software.


Due to its clever and failsafe design, this system is very easy to learn and can be used by owners or operators with varying experience – without the need for external contractors.


The FMD equipment is designed to the highest standards, supported by a three year warranty.


The purpose-designed algorithm simultaneously uses:

  • advanced signal processing
  • an advanced peak detection algorithm
  • low distortion / low noise data acquisition

to ensure highest level of Probability of Detection (PoD) to eliminate false readings.

The failsafe design also means a measurement is only taken when the contact sensor detects correct probe contact and alignment.

Any loss of contact is shown on the reporting software at surface.

System Test Function enables a test prior to deployment.


The compact design of the probe solution means tests can be done on hard to reach areas such as K nodes where other inspection methods are unable to perform.

A range of versatile options are available to suit working depths and varying requirements.

This FMD system is also deployable by ROVs.

Probe 0.5 MHz high power piezo composite probe – single element
Measuring Range 200 – 2000 mm member diameter
Resolution 1 mm


Diver Communications PSU 110-240 AC 50/60 Hz @ 1A (max)
ROV Power Supply 12 to 24 volt D.C @ 60mA


Digital RS232 & RS485
Baud Rate 115,200
Date Capture On demand 3 shot and varying gain levels
Diver Data Link RS485 half – duplex
ROV Date Link RS232 full – duplex suitable for fibre multiplexers


Acetal Electronics Body 0.9 kg (95 mm (diameter) x 115 mm (height))
Stainless Steel Electronics Body 4 kg (95 mm (diameter) x 115 mm (height))
Acetal Probe Handler 2.5 kg (140 x 170 x 130 mm)
Stainless Steel Probe Handler 4.7 kg (140 x 170 x 130 mm)
120m Umbilical Cable 23 kg (340 x 450 x 555 mm)
350m Umbiblical Cable 87 kg (450 x 600 x 930 mm)
50m Deck Cable 13 kg (290 x 380 x 490 mm)
Depth Rating 300 msw
Operation Temperature 0°C to +75°C
Storage Temperature -40°C to 55°C
Cable Protector
– Provides extra cable protection and an attachment point for divers
Self Aligning Probe Handler
– Tough Stainless Steel or
– Lightweight Acetal
Handle Option
– Stainless Steel D-Handle
Communications PSU
– Provides power and communications to the diver
Umbilical Cable
– 120m length
– 350m length
System Test Tank
– Used to run a full system test of the FMD system

1 review for Cygnus FMD System for Diver

Louis P

Nov 25, 2020 11:27 AM

The new Cygnus Ultrasonic FMD System was perfect for our recent application. Our technicians found the software to be very easy to use with features that ensured a quick and reliable result. It’s a great addition to the Westerton Access capability, offering FMD inspection from the Falcon ROV

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