ABB A155-M57 Operation Manual page 79

Operation Manual / 4 Product description / A150-M.. - A155-M..
6 Periodic maintenance work
6.3.3 Cleaning method
The turbine components are cleaned during operation using the wet cleaning method. This
cleaning method is tested and approved by ABB Turbo Systems.
The precondition for wet cleaning is that the enginebuilder approves the process and these
regulations are observed.
V-engines
On V-engines with several turbochargers per engine, parallel cleaning of both turbochargers is
recommended. This cleaning process is faster and reduces the risk of surging of the turbo-
charger.
6.3.4 Function and safety of wet cleaning
Cleaning process with multiple short injection periods
A turbine cleaning procedure with multiple short injection periods is recom-
mended only under certain circumstances. If such a procedure is to be used,
CAUTION
this must be coordinated with ABB Turbo Systems.
Contact ABB Turbo Systems.

Corrosion and deposits when cleaning
Salt water and cooling water treatment substances damage and adversely
affect turbocharger parts.
CAUTION
Never use salt water, but only pure water for cleaning.

To clean the turbine stage during operation, water is injected before the nozzle ring. Based on
an injection phase of 10 minutes, this cleaning procedure uses the principle of water solubility
of dirt deposits.
To prevent corrosion of the inside surfaces of the casings, the engine must be continued to be
operated for 10 minutes after a wet cleaning. The exhaust gas temperature after the turbo-
charger can drop by up to 180 °C during cleaning.
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Revision F January 2017