Operation Manual / Power2 850-M / 4 Product description
6 Periodic maintenance / 6.3 Cleaning turbine and nozzle ring during
operation
© Copyright 2020 ABB. All rights reserved.
HZTL4061_EN
Rev.D
March 2020
Very heavily contaminated turbines can no longer be cleaned in this way. In this case, the
contaminated components must be cleaned mechanically by an ABB Turbocharging Service
Station.
6.3.2
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 ABB:
¡
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.
u
Never use salt water, but only pure water for cleaning.
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.
u
Comply with the cleaning parameters specified in the tables
(see Table 12: Cleaning parameters
.
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