MAN B&W 5L28/32H, Manual

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08028-0D\H5250\94.08.12
1639499-6.0
Page 1 (1)
Water Washing of Turbocharger - Compressor B 15 05 1
94.11
General
During operation the compressor will gradually be
fouled due to the presence of oil mist and dust in the
inlet air.
The fouling reduces the efficiency of the turbochar-
ger which will result in reduced engine performance.
Therefore manual cleaning of the compressor com-
ponents is necessary in connection with overhauls.
This situation requires dismantling of the turbochar-
ger.
However, regular cleaning by injecting water into the
compressor during normal operation of the engine
has proved to reduce the fouling rate to such an
extent that good performance can be maintained in
the period between major overhauls of the turbochar-
ger.
The cleaning effect of injecting pure fresh water is
mainly based upon the mechanical effect arising,
when the water droplets impinge the deposit layer on
the compressor components.
The water is injected in a measured amount and
within a measured period of time by means of the
water washing equipment.
The water washing equipment, see fig 1, comprises
two major parts. The transportable container (6)
including a hand valve with handle (5) and a plug-in
coupling (4) at the end of a lance.
Installed on the engine there is the injection tube (1),
connected to a pipe (2) and a snap coupling (3).
The cleaning procedure is:
1. Fill the container (6) with a measured amount
of fresh water. Blow air into the container by means
of a blow gun, until the prescribed operation pressure
is reached.
2. Connect the plug-in coupling of the lance to the
snap coupling on the pipe, and depress the handle
on the hand valve.
3. The water is then injected into the compressor.
The washing procedure is executed with the engine
running at normal operating temperature and with
the engine load as high as possible, i.e. at a high
compressor speed.
The frequency of water washing should be matched
to the degree of fouling in each individual plant.
1 Injection tube 5 Hand valve with handle
2 Pipe 6 Container
3 Snap coupling 7 Charge air line
4 Plug-in coupling
Fig 1 Water washing equipment