As the emission regulation is coming into force ship operators have to switch fuel before entering a port or a emission controlled area. In order to make this operation as safe as possible MAN Diesel & Turbo has developed the Diesel Switch, building on its own patent.
In particular, the changeover between HFO and distillate fuels can be problematic for fuel equipment, with a high degree of automation necessary to avoid negative incidents. The Diesel Switch ensures the necessary flexibility and safety when changing between HFO and MDO/MGO and comes in two variants: for retrofits and newbuildings.
The Diesel Switch principle
While MAN Diesel & Turbo currently recommends vessels to reduce loads to 25-40% before changing fuel type, the Diesel Switch retrofit enables a controlled and safe changeover independent of engine load. It does this through continuously checking temperature versus time. If the fuel temperature at the engine inlet exceeds 2 degrees/minute, the Diesel Switch emits an alarm and automatically halts the changeover process.
The Diesel Switch also logs the entire changeover process for subsequent use as official documentation for port authorities if required.
The Diesel Switch hardware is controlled by a touch-screen control panel and has software to operate an MGO cooler to adjust fuel temperatures. The changeover valve uses magnetic couples that dispense with mechanical seals and are 100% leak-proof. It also has integrated sensors for detecting current and end positions. As back-up, the entire system has a manual override.