Man L23/30DF, Project Manual

Page: 161 / 392

Bypass cleaning equipment
As a result of normal operation, the lubricating oil contains abraded particles
and combustion residues which have to be removed by the bypass cleaning
system and to a certain extent by the duplex full-flow lubricating oil filter as
well.
With automatic mesh filters this can result in an undesirable and hazardous
continuous flushing. In view of the high cost of cleaning equipment for
removing micro impurities, this equipment is only rated for a certain propor-
tion of the oil flowing through the engine since it is installed in a bypass.
The bypass cleaning equipment is operated
▪
continuously when the engine is in operation or at standstill
For cleaning of lubricating oil the following bypass cleaning equipment can
be used:
▪
Separator unit
▪
Decanter unit
▪
Self cleaning automatic bypass mesh filter
▪
Built-on centrifugal bypass filter (standard on MAN Diesel & Turbo,
Holeby GenSets)
▪
Bypass depth filter
The decanter unit, the self-cleaning automatic bypass mesh filter and the
bypass depth filter capacity must be adjusted according to maker’s recom-
mendations.
In case full flow filtration equipment is chosen, this must only be installed as
in-line cleaning upstream to the duplex full-flow lubricating oil filter, built onto
the engine.
The most appropriate type of equipment for a particular application depends
on the engine output, the type and amount of combustion residues, the
annual operating time and the operating mode of the plant. Even with a rela-
tively low number of operating hours there can be a great deal of combustion
residues if, for instance, the engine is inadequately preheated and quickly
accelerated and loaded.
Separator unit
Continuous lubricating oil cleaning during engine operation is mandatory. An
optimal lubricating oil treatment is fundamental for a reliable working condi-
tion of the engine.
If the lubricating oil is circulating without a separator unit in operation, the
lubricating oil will gradually be contaminated by products of combustion,
water and/or acid. In some instances cat-fines may also be present.
In order to prolong the lubricating oil lifetime and remove wear elements,
water and contaminants from the lubricating oil, it is mandatory to use a by-
pass separator unit.
The separator unit will reduce the carbon residue content and other contami-
nants from combustion on engines operated on HFO, and keep the amount
within MDT’s recommendation, on condition that the separator unit is oper-
ated according to MDT's recommendations.
When operating a cleaning device, the following recommendations must be
observed:
Description
Treatment and maintenance of lubricating oil
1643494-3.11
2016-02-26 - en
B 12 15 0
MAN Diesel & Turbo
2 (11)
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