8.
Compressed Air System
Compressed air is used to start engines and to provide actuating energy for safety and control
devices. The use of starting air for other purposes is limited by the classification regulations.
To ensure the functionality of the components in the compressed air system, the compressed
air has to be free from solid particles and oil.
8.1
Internal compressed air system
The engine is started with a pneumatic starting motor operating at a nominal pressure of 3
MPa (30 bar). The starting motor drives a pinion that turns the gear mounted on the flywheel.
Over 100 rpm the master starter valve closes, and the pinion is drawn back by spring force.
If the electric system fails, the pinion will be pushed back by the driving force of the diesel
engine.
The engine can not be started when the turning gear is engaged.
Each HP fuel pump is provided with a pneumatic stop cylinder which pushes the fuel injection
pumps to zero-delivery when activated. The stop solenoid valve which admits air to the
pneumatic stop cylinders will be activated by the engine stop and safety system, also in case
of an overspeed or an emergency stop command.
Wärtsilä 26 Product Guide - a9 - 7 September 2016
8-1
8. Compressed Air System
Wärtsilä 26 Product Guide
Summary of Contents for WARTSILA 26
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