Filtering And Removing Impurities; Flushing The Engine Oil System; Inspection And Recording In Operation - Man B&W S50ME-B9.3-TII Project Manual

MAN B&W
If the system has been out of operation, un-
used for a long time, it may be necessary to
spot-check for signs of corrosion in the system.
Remove end covers, bends, etc., and inspect
accordingly.
It is important during flushing to keep the oil
warm, approx 60 ˚C, and the flow of oil as high
as possible. For that reason it may be necessary
to run two pumps at the same time.
• Filtering and removing impurities
In order to remove dirt and impurities from the
oil, it is essential to run the purifier system dur-
ing the complete flushing period and/or use a
bypass unit with a 6 μm fine filter and sump-to-
sump filtration, see Fig. 8.05.01.
Furthermore, it is recommended to reduce the
filter mesh size of the main filter unit to 10-25 μm
(to be changed again after sea trial) and use the
6 μm fine filter already installed in the auto-filter
for this temporary installation, see Fig. 8.05.01.
This can lead to a reduction of the flushing time.
The flushing time depends on the system type,
the condition of the piping and the experience of
the yard. (15 to 26 hours should be expected).
• Cleanliness level, measuring kit and flushing log
MAN Diesel & Turbo specifies ISO 4406
XX/16/13 as accepted cleanliness level for the
ME/ME-C/ME-B/-GI hydraulic oil system, and
ISO 4406 XX/19/15 for the remaining part of the
lubricating oil system.
The amount of contamination contained in sys-
tem samples can be estimated by means of the
Pall Fluid Contamination Comparator combined
with the Portable Analysis Kit, HPCA-Kit-0,
which is used by MAN Diesel & Turbo. This kit
and the Comparator included is supplied by Pall
Corporation, USA, www.pall.com
It is important to record the flushing condition
in statements to all inspectors involved. The
MAN Diesel & Turbo Flushing Log form, which is
available on request, or a similar form is recom-
mended for this purpose.
MAN B&W ME/ME-C/ME-B/-GI engines
• Flushing the engine oil system
The second step of flushing the system is to
flush the complete engine oil system. The pro-
cedure depends on the engine type and the
condition in which the engine is delivered from
the engine builder. For detailed information we
recommend contacting the engine builder or
MAN Diesel & Turbo.
• Inspection and recording in operation
Inspect the filters before and after the sea trial.
During operation of the oil system, check the
performance and behaviour of all filters, and
note down any abnormal condition. Take im-
mediate action if any abnormal condition is ob-
served. For instance, if high differential pressure
occurs at short intervals, or in case of abnormal
back flushing, check the filters and take appro-
priate action.
Further information and recommendations regard-
ing flushing, the specified cleanliness level and
how to measure it, and how to use the NAS 1638
oil cleanliness code as an alternative to ISO 4406,
are available from MAN Diesel & Turbo.
MAN Diesel
8.05
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