8.3 External compressed air system
The design of the starting air system is partly determined by classification regulations. Most
classification societies require that the total capacity is divided into two equally sized starting
air receivers and starting air compressors. The requirements concerning multiple engine
installations can be subject to special consideration by the classification society.
The starting air pipes should always be slightly inclined and equipped with manual or automatic
draining at the lowest points.
Instrument air to safety and control devices must be treated in an air dryer.
Fig 8-3 Example of external compressed air system (DAAE022045a)
System components
Starting air vessel3T01Air filter (starting air inlet)3F02
E/P converter8I04Starting air compressor unit3N02
Air dryer unit3N06
Pipe connections
Starting air inlet301
Control air inlet302
Control air to speed governor (if PGA back-up governor)304
Control air to by-pass/waste-gate valve311
Air supply to compressor and turbine cleaning device314
The recommended size for the piping is based on pressure losses in a piping with a length of
40 m.
8-4 Wärtsilä 46F Product Guide - a19 - 1 December 2017
Wärtsilä 46F Product Guide8. Compressed Air System
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