Operation Manual / Power2 800-M / 4 Product description
Page 30 /
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Periodic cleaning of the turbines during operation never replaces the service work where the
low and high-pressure stages are completely dismantled and mechanically cleaned.
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 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
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.
The turbine-end components are cleaned at reduced engine load. The exhaust gas tempera-
ture must not exceed the value specified in the cleaning instructions (see section Prerequi-
sites).
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
(see Table 11) and (see Table 12).
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