Page 37: of Maritime Reporter Magazine (January 2021)

REPAIR & CONVERSION starting point for the shipyard when it was time for them to with the selection to develop a gondola to move the transduc- take over the design. ers below the baseline and allow bubbles to pass between the

To complete this level of design, it was required to work hull and the gondola and not over the face of the transducers. closely with the vendors of the major equipment. SIO com- The gondola is 38 ft. long, 16 ft. wide at the widest. Glosten mitted to Caterpillar and Siemens as primary suppliers at the developed a detailed structural design and nested plates for beginning of the project. Glosten and SIO worked closely the construction of the gondola. We also developed the instal- with suppliers throughout the development of the design to lation of the internal transceivers and conduit routing from address as many issues as possible before construction of the gondola to the transceivers. the equipment started. SIO also chose ZF to supply the bow thruster and therefore the design was done around their spe- And some insights on the New Power Package ci? c product. CAT engines were chosen as the existing generators were

CAT and SIO was familiar with the engines. Additionally,

Can you tell us more about the Gondola? CAT was used on the Thompson repower, so there was the

The existing multibeam and other acoustic sensors was a ability to learn from the previous installation as well as pro- ? ush installation to minimize draft. Flush installations are vide some commonality across the ? eet. The con? guration more prone to bubbles sweeping down and over the transduc- and size of the generators was determined in a Repower ers, reducing the effectiveness of the instruments. Various op- Study completed for the University of Washington for the tions were evaluated with CFD to help improve performance, Thompson midlife. The study compared capital and lifecycle

The Gondola for Scienti? c Transducers

Images courtesy Glosten

Instrument Manufacturer Model DetailsInstrument Manufacturer Model Details

Multibeam Kongsberg EM124 Tx - 1 deg Scienti? c wide band echo sounder SIMRAD EK80 120 kHz

Multibeam Kongsberg EM124 Rx - 2 deg Scienti? c wide band echo sounder SIMRAD EK80 200kHz

Multibeam Kongsberg EM712 Tx - 0.5 deg ADCP RDInstruments 75 kHz

Multibeam Kongsberg EM712 Rx - 1 deg ADCP RDInstruments 150 kHz

Depth sounder Massa TR-1073A 12 kHz Sub-Bottom Massa 16 x TR-1075A 4 kHz Massa TR-1073A 12 kHz Ref Hydrophone

Scienti? c wide band echo sounder SIMRAD EK80 18 kHz Ref Hydrophone

Scienti? c wide band echo sounder SIMRAD EK80 38 kHz HDSS 50 kHz

Scienti? c wide band echo sounder SIMRAD EK80 70 kHz HDSS 140 kHz www.marinelink.com 37

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