Page 58: of Marine Technology Magazine (September 2012)

Products Featured Product Sonardyne Scout USBLSupported by Sonardyne International Ltd?s Scout USBL acoustic positioning technology, ARA Incorporated has completed a subsur- face survey of Terminal 91 in the Port of Seattle. Commissioned following the discovery of World War II munitions on the sea ß oor under the cruise ship facility at Pier 91 within the terminal, ARA?s operation was to identify and clear any magnetic anomalies that could potentially warrant further investigation. A complete vessel based acoustic positioning system, Scout USBL is designed for tracking divers, ROVs and tow Þ sh in waters up to 1,000m. Calculating the position of a subsea target by measur- ing its range and bearing from a vessel mounted transceiver to an acoustic transponder Þ tted to the target, the system offers high accuracy performance with ef Þ cient subsea tracking operations. To undertake the survey, ARA mobilized its Remotely Operated Vehicle (ROV) ROUMRS which was Þ tted with a Sonardyne WSM 6 transponder and a Scout transceiver was deployed from the side of the dock on a simple pole arrangement. Positioning data from Scout was fed to the ac- companying Sonardyne ViewPoint navigation software which transforms the coordinates of surface vessels, subsea vehicles and structures into geographical information that is overlaid on easy-to-use guidance displays. www.sonardyne.com BIRNS Helmet LightsBirns, Inc. launched a new line of Ultra Violet (UV) lighting systems for the commercial diving and ROV market. The all new BIRNS Snooperette-UV and the BIRNS Aquila-UV bring versatile new options to a range of Magnetic Particle In- spection (MPI) and Non-Destructive Testing (NDT) projects. With the new BIRNS UV helmet lights, divers can have both hands free while using a powerful UV light to help identify metal Þ ssures and weak areas at depth. Whether used in ship inspection, or for myriad military and offshore oil and gas applications, the new low voltage BIRNS UV lights have brilliant LED illumination in conjunction with UV lamps, so they operate safely both in and out of the water. Plus, they are ballast-free systems, with instant On/Off capabilities. Rated to 3,400m, the BIRNS Snooperette-UV is highly ver- satile, compact (Ø76mm), and is perfect for divers, cam- eras and ROVs. The BIRNS Aquila-UV is rated to 200m and features a Ø60mm (Ø2.4-in.) housing with wire-free construction, which combines advanced design character- istics with a streamlined 97mm (3.8-in.) pro Þ le that makes it simple to relamp in just 30 seconds. www.birns.com Multigauge 4100 ROV The tanker RFA Darkdale was sunk by a German U-boat and was the Þ rst British ship sunk south of the equator. As it lay in 40m depth, its hull is starting to show signs of leaking oil. A team of nine from the Ministry of Defense DE&S Salvage and Marine Operations (SANMO) were de- ployed to St Helena in April to investigate the condition of the ship and to ascertain whether RFA Darkdale is likely to become an environmental hazard. Part of the survey involved using a Tritex Multigauge 4100 ROV mountable thickness gauge, manufactured by Tritex NDT, mounted onto a Seaeye Falcon ROV. The gauge was used to in- spect the corrosion levels and determine the amount of wastage that has occurred in the hull and whether there is any risk of the hull leaking any more oil. The Multigauge 4100 uses multiple echo which allows metal thickness can be easily measured without removing coatings. The multiple echo?s are also compared to each other pro- viding error checked readings from the back wall. The gauge mounts onto ROVs and is supplied with a datalogging software that allows measure- ments to be stored in a grid or string for- mat. www.tritexndt.com Engineers prepare the ROUMRS ROV, equipped with a WSM 6 transponder, ready for deployment September 201258 MTRMTR #7 (50-64).indd 58MTR #7 (50-64).indd 589/10/2012 10:37:16 AM9/10/2012 10:37:16 AM