â–ª The optimum cleaning effect is achieved by keeping the lubricating oil in
a state of low viscosity for a long period in the separator bowl.
â–ª Sufficiently low viscosity is obtained by preheating the lubricating oil to a
temperature of 95°C - 98°C, when entering the separator bowl.
â–ª The capacity of the separator unit must be adjusted according to MDT's
recommendations.
Slow passage of the lubricating oil through the separator unit is obtained by
using a reduced flow rate and by operating the separator unit 24 hours a
day, stopping only for maintenance, according to maker's recommendation.
Lubricating oil preheating
The installed heater on the separator unit ensures correct lubricating oil tem-
perature during separation. When the engine is at standstill, the heater can
be used for two functions:
▪ The oil from the sump is preheated to 95 – 98 °C by the heater and
cleaned continuously by the separator unit.
â–ª The heater can also be used to maintain an oil temperature of at least
40 °C, depending on installation of the lubricating oil system.
Cleaning capacity
Normally, it is recommended to use a self-cleaning filtration unit in order to
optimize the cleaning period and thus also optimize the size of the filtration
unit. Separator units for manual cleaning can be used when the reduced
effective cleaning time is taken into consideration by dimensioning the sepa-
rator unit capacity.
The centrifuging process in separator bowl
Efficient lubricating oil cleaning relies on the principle that - provided the
through-put is adequate and the treatment is effective - an equilibrium condi-
tion can be reached, where the engine contamination rate is balanced by the
centrifuge separation rate i.e.:
â–ª Contaminant quantity added to the lubricating oil per hour = contaminant
quantity removed by the centrifuge per hour.
It is the purpose of the centrifuging process to ensure that this equilibrium
condition is reached, with the lubricating oil insolubles content being as low
as possible.
Since the cleaning efficiency of the centrifuge is largely dependent upon the
flow rate, it is very important that this is optimised.
A centrifuge can be operated at greatly varying flow rates (Q).
Practical experience has revealed that the content of insolubles, before and
after the centrifuge, is related to the flow rate as shown in Fig. 1.
2016-02-26 - en
Description
Treatment and maintenance of lubricating oil
1643494-3.11
MAN Diesel & Turbo
B 12 15 0
L28/32S; L27/38S; L23/30S; L21/31S; L16/24S; L23/30DF; V28/32S-DF;
L28/32DF; V28/32H; V28/32S; L16/24; L21/31; L23/30H; L27/38;
L28/32H EN
3 (11)
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