External Compressed Air System - Wartsila 31 Product Manual

Wärtsilä 31 Product Guide
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
System components:
3E01
3F02
3N02
3N06
3P01
3S01
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.
Wärtsilä 31 Product Guide - a1 - 18 October 2016
External starting air system (DAAF301502)
Cooler (Starting air compressor unit)
Air filter (starting air inlet)
Starting air compressor unit
Air dryer unit
Compressor (starting air compressor unit)
Separator (starting air compressor unit)
Starting air vessel
8. Compressed Air System
Pipe connections:
301 Starting air inlet
320 Instrument air inlet
Size
DN32
OD12
8-3