Seattle , WA 98101
Glosten is a full-service consulting firm of naval architects, marine engineers, electrical engineers, ocean engineers, and production engineers. The company has provided engineering services to the marine industry for over 60 years, integrating advanced analysis with practical, experience-based design. From the design of an ice-capable ASD harbor tug to the first all-electric vehicle ferry conversion in the US, Glosten’s diverse capabilities span every sector of the industry.
Products & Services
Excavator Dredge Design
Glosten was enlisted to adapt an existing design to meet the specific requirements of the client, J.E. McAmis. Designed and built for tough, water-based digging, the Aquadigger uses a 10-cubic-yard bucket that can dig a level cut 65′ deep. The barge is capable of working in 6-ft. seas.
Olmsted Dam Catamaran Barge
To support "in the wet" construction of the Olmsted locks and dams, Washington Group / Alberici enlisted Glosten to design a vessel to lift the dam shell segments into place. The catamaran barge is comprised of 2 barge hulls (200 ft x 90 x 15 ft ea.) connected by six towers with 15 crossbeams and is used to lift, transport and set the shell segments. Up to 12 strand jacks are supported by gantry beams that run perpendicular to the cross beams, and have a 4,850-ton lift capacity.
HT-67 Harbor Tug
Developed with input from experienced towboat operators, the Glosten HT-67 is designed for versatility of service in inland and near coastal waters. Pairing this ‘harbor-size’ hull with a powerful 1500 horsepower ASD propulsion system imparts the HT-67 with exceptional barge handling capabilities (whether pushing ahead or working alongside) and a responsive character ideal for light ship work in confined areas. Outfitted with a tow winch and pin box/roller assembly (optional), this tug can tow astern as efficiently as a conventionally shafted tug of equal horsepower, and handle barges unassisted on arrival and departure. The propulsion engines can be either Cummins QSK19-M, 750 hp at 1,800 rpm or MAN LE 434, 750 hp at 1,800 rpm. Both engines are EPA Tier 3 compliant.
Emergency Vessel Attachment & Towing System
Glosten, with support from Samson Rope Technologies, has developed an emergency towing solution designed to reduce risks associated with the use of conventional systems, and increase the probability of establishing and maintaining a secure connection in heavy weather. EVATSTM was designed to address safety and reliability concerns associated with conventional methods of connecting to the bow of a disabled vessel. It achieves this goal by integrating design features such as: distribution of line loads over multiple attachment points on the foc'sle deck; rapid deployability / recoverability; and compatibility with covered foc'sles.
San Francisco-Oakland Bay Bridge Demo
Glosten assisted California Engineering Contractors with the marine aspects of the demolition of the San Francisco-Oakland Bay Bridge, reversing the construction process by disassembling sections of the span and demolishing them on land. Glosten selected the barges capable for the job, determined how to safely configure them, designed the span support structure, and analyzed the stability of the barges during loadout, transport, and dismantling. Additionally, the project team determined wind/current conditions, towing configuration and limitations, and mooring design to maintain the vessel position during span lowering. Glosten also provided on-site support for the lift off and/or lowering of bridge spans.
Dredge Tender Modifications
In 2015, the Port of Portland commissioned Glosten to investigate design improvements to the Ivanoff. Glosten deduced that the Ivanoff’s performance issues were related to the stern hull shape, rudder configuration, and propeller sizing. It was determined that the best solution would be to completely redesign the vessel’s stern and propulsion system, with the goal of enabling the Ivanoff to perform the necessary dredge handling operations. The Ivanoff began her transformation in early 2016. The selected shipyard, JT Marine, hired Glosten’s Production Services team to provide detail design for the retrofit. Since leaving the yard, a bollard pull test confirmed that the newly-modified Ivanoff exceeds the bollard pull of its old design by 29%, as well as exceeding that of the Clackamas.
Liquefied Ammonia AT/B Barge Harvest
Glosten was pleased to support Vigor with its construction of Harvest – the first liquefied gas carrier of its type built in in the US in over thirty years. The unmanned Articulated Tug Barge (AT/B) is designed to carry 22,000 tons of anhydrous ammonia, and was constructed for a subsidiary of Savage Companies to support the operations of Tampa Port Services, LLC, a subsidiary of The Mosaic Company. To meet a firm delivery schedule, Glosten managed regulatory approvals and performed functional design, production detailing, and construction engineering concurrent with construction.
Naval Architects / Marine Engineers
- Naval Architects