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| Combined Diesel and Diesel | |
|---|---|
| Name | Combined Diesel and Diesel |
| Type | Marine propulsion system |
| Developer | MAN SE, Wärtsilä, MTU Friedrichshafen, Rolls-Royce plc |
| Introduced | 20th century |
| Usage | Naval ships, merchant vessels, patrol craft, ferries |
| Power source | Diesel engines |
| Components | Multiple diesel engines, clutches, gearboxes, power distribution systems |
Combined Diesel and Diesel
Combined Diesel and Diesel is a propulsion arrangement in which two or more distinct diesel engine sets are configured to drive a single shaft, multiple shafts, or electrical generators for propulsion and auxiliary power on vessels and mobile platforms. The concept is a derivative of marine powerplant strategies employed by Royal Navy, United States Navy, German Navy, Royal Canadian Navy, and commercial shipowners such as Maersk, Mediterranean Shipping Company, and Carnival Corporation & plc. Designers from firms like MAN Energy Solutions, Wärtsilä Corporation, MTU Friedrichshafen GmbH, and Rolls-Royce developed implementations used across naval architecture projects, offshore oil rigs, and high-speed ferry programmes.
CD&D arrangements pair multiple diesel engine units—often of different ratings or models—to achieve redundancy, scalability, and operational flexibility. Implementations were influenced by propulsion philosophies seen in platforms delivered by Blohm+Voss, Fincantieri, Hyundai Heavy Industries, and yards serving Royal Australian Navy and Japan Maritime Self-Defense Force. System integration typically involves components supplied by ZF Friedrichshafen AG, SMA Marine, Schenck and gearbox makers contracted by Babcock International, DCNS (now Naval Group), and ThyssenKrupp Marine Systems.
Common configurations include parallel-diesel mixes where multiple medium-speed diesel engines connect through clutches to a common gearbox, and split-plant configurations where separate diesel sets drive separate shafts or generate electrical power via diesel-electric plants. Examples of platform-level choices were made for classes such as HMS Daring (Type 45 destroyer) alternatives, MEKO series designs, Type 212 submarine logistics, and fast ferries like those ordered by BC Ferries and Stena Line. Auxiliary equipment—propellant transfer systems, fuel pumps, and emission control modules—often originate from suppliers like ABB Group, Siemens, Lloyd's Register, and Det Norske Veritas (DNV).
Performance metrics hinge on engine selection—medium-speed versus high-speed diesel engines—gearbox efficiency from firms such as Voith Turbo, and operational profiles defined by navies like United States Coast Guard or operators like DFDS. Benefits include improved specific fuel consumption across load ranges, resilience during damage control scenarios exemplified by Falklands War lessons, and reduced downtime compared with single-engine plants used by P&O Ferries. Trade-offs include added weight, acoustic signature considerations studied by Admiralty Research Establishment, and lifecycle maintenance influenced by standards from ISO committees and classification societies like American Bureau of Shipping.
CD&D is used in warships—corvettes, frigates, patrol vessels—commercial ro-ro ferries, offshore support vessels, and research ships. Notable programme contexts include procurement by Royal Navy alternatives, coastal patrol craft adopted by United States Navy derivatives, coastguard vessels for Japan Coast Guard, and ferries in the Scandinavian market served by Stena Line and DFDS Seaways. Shipyards such as Navantia, Fincantieri, Austal, and Lürssen have built vessels employing CD&D concepts tailored for operators like MSC Cruises and Royal Caribbean International.
Operators must manage synchronisation, load sharing, maintenance scheduling, and spare parts logistics coordinated with OEMs like MAN, Wärtsilä, MTU, and Caterpillar Inc.. Training curricula often reference standards from SeaTech, Maritime and Coastguard Agency (UK), and maritime academies including United States Merchant Marine Academy and Maine Maritime Academy. Damage control doctrines, habitability planning, and compliance with emission regulations enacted by International Maritime Organization and regional authorities such as European Union influence operational envelopes and retrofitting choices.
The CD&D approach evolved alongside marine propulsion trends observed in the transition from steam turbines in RMS Titanic–era designs to internal combustion powerplants used in interwar and postwar fleets like those modernised by KAWASAKI Heavy Industries and BEAMISH Shipbuilding. Cold War requirements shaped modularity philosophies in classes built by Blohm+Voss and Howaldtswerke-Deutsche Werft, while commercial demand in the late 20th century for fuel-efficient ro-pax and ferry solutions drove engine manufacturers toward flexible multi-engine systems adopted by operators such as P&O and BC Ferries.
CD&D is compared with Combined Diesel and Gas (CODOG), Combined Gas and Gas (COGAG), Combined Diesel or Gas (CODOG), and diesel-electric arrangements. Trade-offs are often examined in procurement studies by RAND Corporation, lifecycle assessments by International Energy Agency, and naval analyses published by Jane's Information Group and Naval Institute Press. Ship designers weigh CD&D against alternatives like CODLAG and pure diesel-electric systems depending on stealth, speed, redundancy, and fuel consumption priorities.
Category:Marine propulsion