Operation Manual / Power2 850-M / 4 Product description
3 Commissioning / 3.1 Oil supply
© Copyright 2020 ABB. All rights reserved.
HZTL4061_EN
Rev.D
March 2020
3.1.4
Long-term lubrication
Long-term lubrication occurs if the times specified for the pre- or post-lubrication are ex-
ceeded with the engine at a standstill.
u
Adhere to the admissible oil pressure range
(see Table 5: Oil pressure range
CAUTION
Oil leak while stopped
The shaft sealing system of the low-pressure and high-pressure stage has
been designed to ensure optimum tightness during operation of the engine.
During standstill, the pressure level in the bearing space may increase until it
is above the pressure outside the shaft seal, resulting in a risk of oil leakage.
u
Observe the points mentioned in the following to reduce the risk of oil
leakage during standstill.
The following measures are recommended for reducing the risk of oil leakage during stand-
still:
¡
Reduction of the pressure in the bearing space by a means of an appropriate crankcase
vent design.
¡
Reduction of the pressure decrease outside the shaft seal due to
stack draft effect by taking measures at the system side.
¡
Reduction of the pressure increase in the engine space by taking measures at the system
side.
¡
Interruption of the oil supply to the turbocharger through the shut-off valve.
3.1.5
Oil filtering
Power2
Filter mesh width [mm]
850
≤
0.034
Table 4: Filter mesh width
3.1.6
Oil pressure
Comply precisely with the oil pressure before the low-pressure and high-pressure stage for
trouble-free operation.
The admissible values are specified in chapter
3.1.7
Oil orifice
Metering orifices are installed in the oil inlet of the low-pressure stage and the high-pressure
stage in order to safeguard the oil pressures.
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