where:
total starting air vessel volume [m
3
]
V
R
=
normal barometric pressure (NTP condition) = 0.1 MPa
p
E
=
air consumption per start [Nm
3
] See Technical data
V
E
=
required number of starts according to the classification society
n =
maximum starting air pressure = 3 MPa
p
Rmax
=
minimum starting air pressure = 1.8 MPa
p
Rmin
=
8.3.3.2
Air assist vessel (3T05)
The required total air assist air vessel volume can be calculated using the formula:
Table 8-1
* if air assist supply is taken
from starting air vessels it is a
subject to class approval.
where:
total air vessel volume [m
3
]
V
R
=
Air consumption per activation, see Technical data
V
A
=
Number of activations
n
1
=
maximum air pressure = 3 MPa
p
Rmax
=
minimum air pressure = see Technical data
p
Rmin
=
NOTE
The total vessel volume shall be divided into at least two equally sized starting air
vessels.
8.3.4
Air filter, starting air inlet (3F02)
Condense formation after the water separator (between starting air compressor and starting
air vessels) create and loosen abrasive rust from the piping, fittings and receivers. Therefore
it is recommended to install a filter before the starting air inlet on the engine to prevent particles
to enter the starting air equipment.
An Y-type strainer can be used with a stainless steel screen and mesh size 400 µm. The
pressure drop should not exceed 20 kPa (0.2 bar) for the engine specific starting air
consumption under a time span of 4 seconds.
8-8
Wärtsilä 32 Product Guide - a21 - 7 September 2016
Wärtsilä 32 Product Guide
8. Compressed Air System
Summary of Contents for WARTSILA32
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