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 Cleaning turbine blades and nozzle ring in
operation
Combustion of heavy fuel oil in diesel engines causes soiling of the tur-
bine blades and nozzle rings of the turbochargers.
Soiling increases with time, so that regular and properly performed
cleaning is important to remove the accumulated deposits.
The exhaust gas temperature downstream of the cylinders can rise and
the charging pressure at the air receiver can fall if turbine components
become soiled.
A soiled turbine also results in rotor unbalance. Severe soiling can lead to
impermissibly high rotor imbalance.
Experience in operation has shown that despite periodic cleaning during
operation, it is impossible to dispense with overhauls during which the
turbine and nozzle ring are mechanically cleaned. However, if cleaning is
performed correctly and the cleaning system is properly dimensioned,
the intervals between overhauls can be extended.
Wet-cleaning interval
The interval between periodic cleaning is very dependent on the operat-
ing conditions. As a rule, cleaning should be carried out every 50to500
operating hours.
Dry-cleaning interval
The interval between periodic cleaning is very dependent on the operat-
ing conditions. As a rule, cleaning should be carried out every 25to50
operating hours.
Cleaning methods
Several methods are possible for cleaning the turbine and nozzle ring
during operation. The cleaning methods described in the following have
been tested and are recommended by ABB Turbo Systems:
¡ Wet cleaning
¡ Dry cleaning
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