NEDC Marine Repower Guide: The economic and environmental benefits of diesel engine repowering. Marine diesel engines are built to last the life of the vessel. Typically they can be life- extended and remanufactured well beyond the life of the vessel. Diesel engine exhaust primary pollutants of concern are oxides of nitrogen (NOx) and particulate matter (PM). EPA has adopted a three- pronged approach for marine engines that will eventually result in emission reductions. A voluntary program that focuses on repowering the in- use marine vessel fleet with new certified engines augments the above approach and helps to achieve the environmental goals, sooner rather than later. Generally speaking the greatest emission reductions for capital expended will be achieved when: The existing engines are of an older vintage (especially pre- 1. The existing engines are two- stroke as opposed to four- stroke; The vessel has high annual fuel consumption as emissions are directly correlated to fuel consumed; and The vessel operates in and around population- dense areas with poor air quality. When compared to diesel retrofit programs (i. The Rebate Grants Program is a simplified application process under the Emissions Reduction Incentive Grant Program. Rebate grants are only available for diesel on-road and select non-road replacement and repower projects. National Funding Assistance Program administers competitive grants for clean diesel projects. The Diesel Emissions Reduction Act (DERA) appropriates funds for these projects. DOCs and DPFs while maintaining the existing engine), it would take about 2. PM reduced per year*. It is important to note that actual tons of emissions reduced are only one part of the equation; proximity to sensitive populations being the second. Taken in aggregate, marine vessel repowers represent one of the best investments in air quality that can be made today. The good news for vessel owners is that in many cases, new modern diesel engines are not only cleaner from an emission standpoint but are also highly turbocharged and more fuel efficient, resulting in lower annual fuel costs, improved oil drain intervals and in many cases less frequent maintenance and rebuild intervals. The operational savings will ultimately translate into a return on investment (ROI) that over time will pay for the new engines. In most instances the ROI is in the 1. There are a few metrics to consider when contemplating whether a repower makes good economic sense as well as good environmental sense. Certainly the new engine will be cleaner, but like ROI, the environmental return ($/ton of pollution reduced) needs to be cost- effective. The first step is to know your vessel: Engine model, horsepower and model year Annual fuel use (hourly fuel use x operating hours is not accurate enough)Engine operating hours. Whether the fuel injection system is electronic or mechanical. Consider equipment useful life, obsolete engines, space in the engine room As a rule of thumb, engine repowers only make good economic and environmental sense if the fuel consumption is greater than 1. For example a 3,0. ROI. The second step is to determine whether your existing engines may be regulated under new EPA rules (4. CFR 1. 04. 2). This rule does not require repowering, but it may increase the maintenance costs of older engines, making repowering look more economically favorable. EPA defines remanufacture as replacement of all cylinder liners, either in one event or over a five- year period. For example, if the annual fuel savings expected by the repower is 5,0. CO2 emissions avoided will be 1. The fourth step for a repower analysis is to get a complete picture of the repower process, including the cost of all parts, labor, and professional services required to complete the effort. Parts may include not only the new EPA compliant engine but may also include gearboxes, structural foundations, cooling system upgrades, exhaust system upgrades, engine electronics and an upgraded fuel system components. Labor items include dry dock or yard time, cutting access holes, crane and rigging services, shore power during repower, bilge cleaning, engine installation and alignment, cooling and exhaust system pipe fitting, electronic controls and wiring installation, fabrication of new foundations for main engines and gearboxes and finally sea trials and commissioning. Professional services may include those of a marine architect to prepare a set of plans. Once these costs are determined, an actual capital expenditure budget can be assembled and compared to the expected operational savings so that a baseline ROI can be determined. Note that fuel prices have a significant impact on ROI. The final step is to look for grant opportunities if the repower ROI is in excess of 7 years. Federal grants maybe available to offset the cost of the repower, however these grant programs are highly competitive and consider the environmental benefit as well as cost- effectiveness of the project. Repowering vessels with new low- emission engines will not only improve the environment but will help put money in your pocket. Case studies. Commercial Marine Vessel Emission Repower Project. Gulf Coast Repower Report. Resources Balon, Tom. Harbor Craft Marine Technology Webinar. Midwest Clean Diesel Initiative Marine and Locomotive Repower webinars. Ports Compliance Assistance website. Technical Service Agreement between Consultants and Grant Recipients. Memorandum of Understanding between Grant Recipient and Vessel Operator.
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