Bristol Harbor Group, Inc. (BHGI) is a full-service naval architecture, marine engineering and consulting firm located on the harbor in Bristol, Rhode Island. BHGI has been in business for over twenty-five years, and has produced numerous designs, to which hundreds of vessels have been built. We specialize in commercial vessel design and consulting, and have experience with tugs, barges, Articulated Tug & Barge (ATB) units, passenger vessels, workboats, dredges and floating dry docks. We offer a wide range of design, engineering and analysis services utilizing state of the art computer modeling and design tools in concert with time honored design practices to develop innovative and functional designs. Our team of dedicated professionals hail from some of the best naval architecture schools in the United States, and we stand ready to develop practical and efficient designs to meet your specific needs. Please drop us a line to discuss how BHGI can help make your next project a reality.
Naval Architecture and Marine Engineering
BHGI offers design services from the conceptual design through the detail design and shipyard support. Some of BHGI’s design services include but are not limited to hull design, structural design and analysis, stability analysis, and weight estimating. BHGI’s marine engineering practice focuses on the design of new vessels, repowering’s, and mechanical and electrical upgrades. BHGI’s marine engineers have many years of hands on experience, both aboard vessels and in shipyards. This practical experience allows our marine engineers to better understand both operational and technical issues.
Finite Element Analyses (FEA)
BHGI has the ability to examine complex structures, for which conventional methods of analysis would be extremely difficult or time-consuming, using advanced computational methods such as finite element analysis (FEA). An analysis is possible for the entire vessel or for only certain areas of interest, such as a foundation that is expected to experience high loads. Our FEA skills have allowed us to answer questions about many designs quickly and with a high degree of confidence. We regularly perform linear static, nonlinear static,buckling, contact, and transient dynamic analyses. Our experience also includes fluid-vessel interactions in various situations, both in still water and in a range of sea states.
Computational Fluid Dynamics Analyses
BHGI performs Computational Fluid Dynamics (CFD) analyses using Orca Marine’s Simeric's CFD program to conduct resistance studies on vessel hulls of all forms. Hull models are generated by BHGI’s engineers and are run at various conditions to predict the performance of the vessel. BHGI uses CFD analysis to estimate ship hull performance in calm waters. This is especially useful when looking to optimize the vessel’s hull form to improve fuel economy. We have used our CFD capabilities to conduct comparative studies of barges, tugs, towboats, and ATB units. From these studies, hull form was able to be optimized to provide vessels with improved flow and resistance characteristics. CFD results include running waterline, resistance, wave train, pressure plots, and a variety of other analyses.
BHGI provides technical support and consulting services to vessel owners, charterers, and operators. These services can be in support of new construction projects, modifications, regularly scheduled dry docks or more comprehensive maintenance periods. This can include anything from shipyard selection to construction oversight. BHGI also provides life-cycle management and fleet reviews, among many other consulting services.
B-2 BREAKER Construction Oversight
BHGI was contracted by the New York Power Authority (NYPA) to design and perform construction supervision support services for two new tug vessels. The tugs will be used for the deployment, retrieval and maintenance of the Lake Erie ice boom. The first tug has already been built and delivered. BHGI developed and revised the second vessel specifications and bid drawing package in close collaboration with the operators, including significant detailed system design for the second vessel to provide improved ergonomics for the crew. NYPA awarded a contract to Blount Boats for the construction of the B-2 BREAKER tug. BHGI is again performing construction oversight services on behalf of NYPA and visits the yard on a weekly basis, as it is only ten minutes away from our office. Construction is expected to be completed in 2020.
BHGI was contracted by Sayville Ferry Service, Inc.located in Sayville, NY to provide the design of an aluminum monohull high speed ferry for 400 passengers and cargo providing service from Sayville to Fire Island. The new design will be based on an existing parent vessel. The vessel is being designed to comply with 46 CFR Subchapter K. The project includes both preliminary and detail design packages for all aspects of naval architecture and marine engineering. There is particular emphasis on modernization of the propulsion plant, improvements for passenger embarkation/debarkation and cargo handling, hydrodynamic enhancements, and vibration reduction. BHGI recently completed the preliminary design phase and has begun the detail design phase.
Baltimore Water Taxi
BHGI was contracted by Whitman, Requardt & Associates, LLP (WRA) to develop the design of an electric water taxi. WRA has a contract with the Baltimore City Department of Transportation to provide project management, oversight and owner’s representation services for the construction of an electric powered water taxi.BHGI generated a conceptual general arrangement and conceptual bid specification. BHGI provided WRA with performance specifications, which will constitute the basis for which the shipyard will design and construct the vessel. WRA has incorporated BHGI’s performance specifications into an RFP package which has been submitted to the DOT for review. Once approved, it will be published by the DOT to solicit bids from various shipyards. BHGI will then review the proposals submitted by the shipyards and offer comments and direction on both technical and cost submittals.
Mat Sinking Unit
BHGI was contracted by USACE to design, size, and specify details for a new Mat Boat, Mat Assembly Process and Mat Placement Process. The Mat Sinking Unit’s purpose is to lay a protective overcoat of concrete mats to shield the riverbank from erosion and sloughing. USACE’s goal is to minimize environmental impact and improve safety of USACE’s personnel who operate the MSU by incorporating automated technology. In 2017, BHGI was subcontracted by SIA Solutions, LLC to execute the detailed design of the Mat Boat. BHGI coordinated with the National Robotics Engineering Center, who is responsible for the design and engineering of the robotic system on the Mat Boat, to ensure that the structure for the mat deck can incorporate the robotics they are designing and the weights are updated accordingly. Phase II was recently completed.
BHGI was contracted by NYPA to review and analyze a Canadian Coast Guard buoy for required internal ballast and mooring in order to secure the buoy moorings in tailrace waters. BHGI conducted a site visit to inspect the tailrace buoys currently installed and to discuss possible new designs developments with NYPA’s engineers. BHGI gathered data in field conditions and buoy performance. The new buoy includes reoriented battery boxes for ease of maintenance; ballast compartments for adjustable trim; a taller tower to fit a larger, more visible warning sign and light; and an enhanced mooring system to assure secure placement and allow the buoy to self-deploy with only existing NYPA small boat support. CFD analyses was conducted on the new design to confirm the desired performance once deployed. The buoy was deployed successfully in 2019.
USACE IDIQ Contract
BHGI has been tasked with a number of projects through our second 5-year IDIQ contract with the U.S. Army Corps of Engineers, Philadelphia District. Recent projects include: Developing a contract level design for the DRIFTMASTER II. The DRIFTMASTER II will include a new hybrid-diesel-electric power system. The design and engineering effort has included extensive use of CFD, model tank testing and FEA. BHGI was tasked to perform a ship check on the existing Bank Grader Unit and to develop contract level design drawings and calculations for a floating crane supporting a dragline machine. BHGI was also tasked to develop a Waterways Commerce Cutter ATON Indicative Design.
Naval Architects / Marine Engineers