ABB HT563441 Operation Manual page 59

Principle of wet cleaning
CAUTION
CAUTION
V-engines
Sequential charging
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Maintenance
Cleaning the compressor during
operation
Cleaning method
Cleaning the compressor while in operation is carried out as wet cleaning.
This cleaning method has been tested and approved by ABB Turbo
Systems.
To clean the compressor stage during operation, water is injected in front
of the compressor wheel through an injection pipe fitted in the filter
silencer or the suction branch.
The water does not act as a solvent, but the dirt deposit is removed by the
mechanical impact of the droplets. This is a very suitable process,
provided that the degree of contamination is not too high.
Corrosion and deposits when cleaning
Damage and impairment of turbocharger parts due to salt water and
cooling water additives
Don't use salt water for cleaning, but only clean fresh water.

The injection pipe must on no account be connected directly via a cock
to a water pipe or a dosing vessel larger than the one supplied. This
prevents uncontrolled volumes of water entering the turbocharger and
engine, which can lead to serious damage.
In the case of V-engines with several turbochargers on each engine, we
recommend parallel cleaning of the compressors. This cleaning process is
faster and the risk of turbocharger surging is reduced.
In the case of sequential charging, care must be taken to ensure that
turbocharger compressors are cleaned regularly, especially after periods
of operation in the lower performance range.
Operation Manual / TPS48-D/E.. - TPS61-D/E..
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5.2 Page 57