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Petromin marine and offshore Jan-Feb Issue

3. Vessels that require,

3. Vessels that require, due to space limitations, more than one machinery space are subject to increased construction cost due to duplication of increases in system such as: engine cooling, space ventilation, control facilities, exhaust, etc. 4. Vessels that have a large variation in power consumption. The fact that the propulsion power may be supplied by an electric motor instead of a direct driven diesel engine does not makes equipment aboard the vessel any less familiar to the operator. The utilization of the diesel engines is transferred from direct propulsion power to generate power. This provides greater flexibility in the use of installed KW, and in some instances, reduces the number of diesel engines installed. The ability to generate only the power required to meet the needs of the duty cycle of vessels utilizing multiple generator sets reduces fuel consumption and maintenance cost. It also provides redundancy in power capacity. Salient Features of Diesel- Electric Propulsion 1. Economic Reasons Diesel electric propulsion is especially economical for a number of reasons: • Optimal utilization of fuel for diesel engines to generate electrical power, even in partial load ranges. • High efficiency across the entire speed range. • Reduced maintenance costs through longer service intervals based on the optimized operating times of diesel engines with constant speed. • Minimal standstill time for maintenance and service. • Flexible and need-oriented use of diesel generator sets in combination power plant for drives and onboard power systems. 2. Availability Diesel electric propulsion systems demonstrate high availability for reasons that include: • Modular design with small probability of total loss of propulsion power. • Sharply reduced number of moving mechanical parts. • Proven technologies based on decades of operating experiences. • Redundant drives with one propeller are also possible. • Designs are also possible for maximum redundancy requirements. 3. Environmental Compatibility Diesel electrical propulsion systems protect the environment because the pollution emissions of diesel engines is reduced by operating the engine at the optimal speed and load ranges. 4. Operating Convenience Diesel electrical propulsion is very convenient for the users, because of the following: • Excellent dynamic response from zero to maximum propelling speed. • Short reversing time. • Availability of maximum torque across the entire speed range at 46 January to February 2018

the propeller. • Quite operation. • Minimum mechanical vibrations. By listening to our customers we are able to apply GE engineering expertise to what matters most on a case by case basis, serving the diversity of their individual businesses. 5. Flexibility • Flexible arrangement of components in the ship. GE’s class leading products and our customized engineering produces systems that emphasize one or more of the following attributes: • Simplified mechanical requirements for the propeller shaft. • Reduced space requirements in the shaft system. • Design and engineering of propeller is independent of the drive. • Flexibility in the choice of diesel engine speed • Improved machinery layout and space savings • Increased flexibility • Reduced noise and vibration • Improved reliability leading to reduced maintenance costs • Reduced operating costs: Technology Providers Fuel economy Reduced maintenance The following 2 technology providers are examples of providers of electric propulsion systems, and are by no means exhaustive. Reduced lost time/down time • Configurable for maximum system availability/redundancy GE GE’s complete solutions portfolio includes systems for full electric propulsion, for hybrid systems featuring electric With more than 80 years experience and with a wide portfolio of customized solutions, GE applies smarter engineering to configure its power and propulsion solutions to suit the needs of each individual customer. propulsion drives trains to augment mechanical propulsion equipment, and for power take off/power take in. GE have expertise at every stage of the power and propulsion process; from gas turbines and diesel engines through to podded propulsion units and everything in between. GE systems and solutions are at work worldwide in a diverse range of applications and ship types including warships, naval support ships, offshore vessels of all types, tankers, cruise ships, ice breakers, and more. For each application, system engineering can include technical specifications, calculations and analysis, operational assessments and requirements analysis, feasibility studies and evalu- January to February 2018 47

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