ABB HT842305 Operation Manual page 63

Operation Manual / TPL85-B14/-B15/-B16
5 Maintenance / 5.5 Cleaning turbine blades and nozzle ring in opera-
tion
5.5.1 Wet cleaning of the turbine and nozzle ring
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The maximum allowable exhaust gas temperature specified by the en-
gine manufacturer and the temperature T
bocharger rating plate must not be exceeded under any circumstances.
During wet cleaning, the turbine is braked and the turbocharger runs at a
reduced speed. As a result, less air is supplied to the engine and the tem-
perature following the engine cylinder and exhaust valve rises.
Operating state prerequisites for wet cleaning
In order to be able to carry out a satisfactory cleaning process that has
been tested and is recommended by ABB Turbo Systems, the following
prerequisites must be met:
After an engine start-up or during operation, the engine performance
w
level must be adjusted until the scavenging air pressure p
the range of 0.3 ... 0.6 bar (overpressure).
Wait 10 ... 15 minutes (stabilising time) until the exhaust gas temper-
w
ature at the turbine inlet is stable and below 430 °C. In addition, the
auxiliary blower must be operating.
Start the cleaning cycle according to following description Wet clean-
u
ing operation.
HZTL2491_EN
specified on the tur-
Mmax
is within
scav
Revision C August 2018