Wartsila 31 Product Manual page 51

Wärtsilä 31 Product Guide
The engine can be specified to either operate on heavy fuel oil (HFO) or on marine diesel fuel
(MDF). The engine is designed for continuous operation on HFO. It is however possible to
operate HFO engines on MDF intermittently without alternations. If the operation of the engine
is changed from HFO to continuous operation on MDF, then a change of exhaust valves from
Nimonic to Stellite is recommended.
6.2.1 Leak fuel system
Clean leak fuel from the injection valves is collected on the engine and drained by gravity
through a clean leak fuel connection. The clean leak fuel can be re-used without separation.
The quantity of clean leak fuel is given in chapter Technical data.
Other possible leak fuel and spilled water and oil is separately drained from the hot-box through
dirty fuel oil connections and it shall be led to a sludge tank.
Wärtsilä 31 Product Guide - a1 - 18 October 2016
6. Fuel Oil System
6-7