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 (DAAE055759C)
V34DF
L34DF
Pipe connections
System components
DN32
Starting air inlet
301
Cooler (Starting air compressor unit)
3E01
OD12
Instrument air inlet
320
Air filter (starting air inlet)
3F02
Starting air compressor unit
3N02
Air dryer unit
3N06
Compressor (Starting air compressor unit)
3P01
Separator (Starting air compressor unit)
3S01
Starting air vessel
3T01
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.
8-4
Wärtsilä 34DF Product Guide - a16 - 23 September 2016
Wärtsilä 34DF Product Guide
8. Compressed Air System
Summary of Contents for WARTSILA 34DF
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