Most LNG tankers are powered by diesel/gas engines. As well as being the simplest, most robust and economic method of propulsion, they are suited to nearly all types of vessels.
The set-up of the propulsion system depends on the vessel size, trade or type of operation. Whatever the system, the key requirements for a marine engine are reliability, economical fuel consumption, speed and long life.
Without adequate cooling, the high temperatures created by burning fuel would cause marine engines to fail. Keeping them cool during operation is therefore crucial and requires a range of different components for reducing the temperature of the circulation water, charge air and lubrication oil.