Page 36: of Maritime Reporter Magazine (January 2021)

REPAIR & CONVERSION

RV Roger Revelle &

Ef? cient Re? t by Design

From 3D laser scanning to Computational Fluid Dynamics, an ef? cient and successful major mid-life re? t such as the one completed on the RV Roger Revelle requires intricate advance design planning, an updated technical toolbelt, as well as the personal touch. Tim Leach,

Principal, Naval Architect (Glosten), walks us through the process.

By Greg Trauthwein 3. Uncontaminated seawater

What work was completed by (for science)

Glosten on the RV Roger Rev- 4. PA replacement elle midlife re? t.

5. Dial telephones

Glosten has a long history of work- 6. New cranes ing with Scripps (SIO) and the Rev-

Through a parallel effort, Glosten elle. Building on that knowledge of developed a gondola to house the sci- the Revelle and the experience Glosten enti? c transducers, with the intent of gained during the midlife re? t of the improving performance. This was in-

RV Thomas G. Thompson, we worked corporated into the midlife. The steel closely with SIO to develop 39 work design was developed to a detail level packages for the midlife re? t of the including nest plates.

Revelle. These work packages ranged from small maintenance items to the

What was the most challeng- complete repowering of the vessel. In

Tim Leach, Principal, ing portion of the project?

addition to the repowering, other major

Naval Architect, Glosten

Major modi? cations are inherently items included replacement of the bow system changes and major structural complicated as the new equipment thruster, Ballast Water Treatment Sys- changes. needs to ? t in existing spaces and in- tem installation, HVAC (Heating, Venti-

Glosten also worked with SIO do de- tegrate with the existing equipment. lation, and Air Conditioning) upgrades, noise mitigation of Engine Room fans, velop HVAC modi? cations to improve During the midlife of the Thompson, pipe replacement, and a new gondola function and reduce noise. This in- lessons were learned that brought about cluded: a desire for more control of the design for the scienti? c transducers.

The repowering involved replacing 1. Upgrading HVAC controls process including more detailed design the six existing air-cooled generators 2. Computer lab server space HVAC to ensure ? t and performance.

3. Bow thruster room change from To accomplish this level of design, and split electrical bus con? guration ventilation cooling to (AC) air con- Glosten started by performing 3D laser (auxiliary and propulsion separate) with ditioning scans of the engine room, motor room, four new water-cooled generators and 4. Modi? cation of port and starboard and other affected areas. In the devel- an integrated bus (auxiliary and propul-

Generator Room supply fan intakes opment of the modi? cations, the team sion together). This included replacing to decrease noise and improve sup- modeled the mechanical spaces in 3D major switchboards and transformers, ply air quality in Cadmatic. We brought the scan data as well as the propulsion motors and

Other mechanical systems that are into Cadmatic to enable us to place drives. Glosten developed a detailed reaching the end of life were also re- equipment and route pipe while being design of the installation of the genera- tors, combustion exhaust, and auxiliary placed. Glosten developed require- mindful of existing equipment, pipes, systems, including detailed routing of ments and design for: electrical cables, and structure. This piping as well as electrical cable pull 1. Chiller replacement provided a high level of con? dence sheets. The bow thruster replacement 2. New refrigeration units for science that the design would be executed as and provisions planned. This also provided a better involved integration with the powering 36 Maritime Reporter & Engineering News • January 2021

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