Operation Manual / TPL73-B.. - 85-B11/ -B12
5 Maintenance / 5.5 Cleaning turbine blades and nozzle ring in opera-
tion
© Copyright 2018 . All rights reserved.
HZTL2480_EN
Revision D
July 2018
5.5.1
Wet cleaning of the turbine and nozzle ring
The maximum allowable exhaust gas temperature specified by the en-
gine manufacturer and the temperature T
Mmax
specified on the tur-
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:
w
After an engine start-up or during operation, the engine performance
level must be adjusted until the scavenging air pressure
p
scav
is
within
the range of 0.3 ... 0.6 bar
(overpressure).
w
Wait 10 ... 15 minutes (stabilising time) until the exhaust gas temper-
ature at the turbine inlet is stable and below 430 °C. In addition, the
auxiliary blower must be operating.
u
Start the cleaning cycle according to following description
Wet clean-
ing operation.
Wet cleaning
1Water supply (fresh water only)
8Drain pipe
2Regulating valve
9Drain cock
3Manometer
10Drain
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