Compressed Air System; Instrument Air Quality; Internal Compressed Air System - Wartsila 31 Product Manual

Wärtsilä 31 Product Guide
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

Instrument air quality

The quality of instrument air, from the ships instrument air system, for safety and control
devices must fulfill the following requirements.
Instrument air specification:
Design pressure
Nominal pressure
Dew point temperature
Max. oil content
Max. particle size
8.2

Internal compressed air system

All engines, independent of cylinder number, are started by means of compressed air with a
nominal pressure of 3 MPa (30 bar). The start is performed by direct injection of air into the
cylinders through the starting air valves in the cylinder heads. The main starting valve, is
operated by an pneumatically operated solenoid valve for local (button in the control cabinet),
remote or automatic start.
All engines have built-on non-return valves and flame arrestors. The engine can not be started
when the turning gear is engaged.
Wärtsilä 31 Product Guide - a1 - 18 October 2016
8. Compressed Air System
1 MPa (10 bar)
0.7 MPa (7 bar)
+3°C
3
1 mg/m
3 µm
8-1