The starting air vessels are to be equipped with at least a manual valve for condensate drain.
If the air vessels are mounted horizontally, there must be an inclination of 3...5° towards the
drain valve to ensure efficient draining.
Fig 8-2 Starting air vessel
1)
Dimensions are approximate.
The starting air consumption stated in technical data is for a successful start. During start the
main starting valve is kept open until the engine starts, or until the max. time for the starting
attempt has elapsed. A failed start can consume two times the air volume stated in technical
data. If the ship has a class notation for unattended machinery spaces, then the starts are to
be demonstrated.
The required total starting air vessel volume can be calculated using the formula:
where:
total starting air vessel volume [m
3
]V
R
=
normal barometric pressure (NTP condition) = 0.1 MPap
E
=
air consumption per start [Nm
3
] See Technical dataV
E
=
required number of starts according to the classification societyn =
maximum starting air pressure = 3 MPap
Rmax
=
minimum starting air pressure = See Technical datap
Rmin
=
DBAE248994 8-3
8. Compressed Air SystemWärtsilä 31DF Product Guide
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