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 8-2 External starting air system (DAAF301502)
SizePipe connections:System components:
DN32Starting air inlet301Cooler (Starting air compressor unit)3E01
OD12Instrument air inlet320Air filter (starting air inlet)3F02
Starting air compressor unit3N02
Air dryer unit3N06
Compressor (starting air compressor unit)3P01
Separator (starting air compressor unit)3S01
Starting air vessel3T01
8.3.1 Starting air compressor unit (3N02)
At least two starting air compressors must be installed. It is recommended that the compressors
are capable of filling the starting air vessel from minimum (1.8 MPa) to maximum pressure in
15...30 minutes. For exact determination of the minimum capacity, the rules of the classification
societies must be followed.
Wärtsilä 31 Product Guide - a1 - 18 October 2016 8-3
8. Compressed Air SystemWärtsilä 31 Product Guide
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