ABB PT004165 Operation Manual page 57

Operation Manual / Power2 850-M / High-pressure stage
7 Periodic maintenance / 7.3 Cleaning turbine and nozzle ring during
operation
7.3.2 Cleaning method and principle
Cleaning of the turbine and the nozzle ring during operation is carried out by the cleaning
method described in the following and is tested and approved by Turbo Systems:
¡
Wet cleaning
Wet cleaning makes use of various effects. These effects are used with varying levels of in-
tensity, depending on the type of contamination:
¡
Erosion
The contamination is removed by the mechanical action of the impacting water droplets
¡
Solubility
Water solubility of the contamination deposits in water
¡
Thermal shock
Spalling of contamination due to the temperature differential
CAUTION
Corrosion and deposits when cleaning
Salt water and cooling water treatment substances damage and adversely
affect parts of the low-pressure and high-pressure stage.
Never use salt water, but only pure water for cleaning.
u
The turbine-end components are cleaned at reduced engine load. The exhaust gas temperat-
ure must not exceed the value specified in the cleaning instructions (see section Prerequis-
ites).
CAUTION
Reduced service life of the components
Failure to comply with the minimum stabilisation time before cleaning, the
prescribed turbine inlet temperatures and the drying time after cleaning sig-
nificantly reduces the expected service life of the components.
Comply with the cleaning parameters specified in the tables
u
Table 19: Cleaning parameters HP →57)
parameters LP
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→57).
HZTL4063_EN
(see
and (see Table 20: Cleaning
Rev.F March 2022