Man L23/30DF, Project Manual

Page: 279 / 392

Engine operation under arctic conditions
Arctic condition is defined as:
Ambient air temperature below +5°C
If engines operate under arctic conditions (intermit-
tently or permanently), the engine equipment and
plant installation have to meet special design fea-
tures and requirements. They depend on the possi-
ble minimum air intake temperature of the engine
and the specification of the fuel used.
Special engine design requirements
If arctic fuel oil (with very low lubricating properties)
is used, the following actions are required:
Fuel injection pump:
▪
The maximum allowable fuel temperatures have
to be kept.
▪
Only in case of conventional injection system,
dependent on engine type installation and acti-
vation of sealing oil system may be necessary,
because low viscosity of the fuel can cause an
increased leakage and the lube oil will possibly
being contaminated.
Engine equipment
SaCoS/SaCoS
one
SaCoS/SaCoS
one
equipment is suitable to be stored
at minimum ambient temperatures of -15°C.
In case these conditions cannot be met. Protective
measures against climatic influences have to be
taken for the following electronic components:
▪
EDS Databox APC620
▪
TFT-touchscreen display
▪
Emergency switch module BD5937
These components have to be stored at places,
where the temperature is above –15°C.
▪
A minimum operating temperature of ≥ +5°C
has to be ensured. That’s why an optional elec-
tric heating has to be used.
Alternators
Alternator operation is possible according to suppli-
ers specification.
Plant installation
Intake air conditioning
▪
Air intake of the engine and power house/
engine room ventilation have to be two different
systems to ensure that the power house/
engine room temperature is not too low caused
by the ambient air temperature.
▪
It is necessary to ensure that the charge air
cooler cannot freeze when the engine is out of
operation (and the cold air is at the air inlet
side).
An air intake temperature of the engine ≥ 5°C
has to be ensured by preheating.
Ventilation of power house/engine room:
▪
The air of the power house/engine room ventila-
tion must not be too cold (preheating is neces-
sary) to avoid the freezing of the liquids in the
power house/engine room) systems.
▪
Minimum powerhouse/engine room tempera-
ture for design ≥ +5°C
Coolant and lube oil systems:
▪
HT and lube oil system has to be preheated as
specified in the relevant chapters of the project
guide for each individual engine.
▪
If a concentration of anti-freezing agents of > 50
% is needed, please contact MAN Diesel &
Turbo for approval.
▪
For information regarding engine cooling water
please see chapter "Cooling water system".
Insulation:
▪
The design of the insulation of the piping sys-
tems and other plant parts (tanks, heat
exchanger etc.) has to be modified and
designed for the special requirements of arctic
conditions.
Heat tracing:
▪
To support the restart procedures in cold condi-
tion (e.g. after unmanned survival mode during
winter), it is recommended to install a heat trac-
ing system in the piping to the engine.
Note!
A preheating of the lube oil has to be ensured. If the
plant is not equipped with a lube oil separator (e.g.
plants only operation on MGO) alternative equip-
ment for preheating of the lube oil to be provided.
For plants taken out of operation and cooled down
MAN Diesel & Turbo
1689459-9.0
Page 1 (2)
Engine operation under arctic conditions
B 17 00 0
L27/38S, L16/24S, L21/31S, L16/24, L21/31, L27/38
2015.11.27