Cleaning The Turbine During Operation - ABB A140-H56 Operation Manual

Operation Manual / A130-H.. - A140-H..
8 Periodic maintenance
Repetitions of wet cleaning of the compressor
Before repeating the wet cleaning or after the last cleaning, observe a minimum drying time of
5 minutes with the engine running.
The success of the cleaning can be recognised based on the charging pressure or the ex-
haust gas temperature.
If the cleaning is still unsuccessful after three processes and the engine values are unsatisfac-
tory, it is recommended to have the turbocharger checked and cleaned by an ABB Tur-
bocharging Service Station.
8.3

Cleaning the turbine during operation

Introduction
The combustion of fuels such as marine diesel oil (MDO) and heavy fuel oil (HFO) in diesel
engines causes contamination of the turbine components of the turbocharger. Poor quality fuel
in conjunction with a high exhaust gas temperature can lead to very hard deposits on the
nozzle ring and particularly on the gas outlet flange.
ABB Turbo Systems recommends the use of fuels with low ash, sulphur, sodium and vanadi-
um contents.
Consequences of contamination:
 Poor efficiency of turbine
 Elevated exhaust gas temperatures
 Higher charging and ignition pressures with increasing turbocharger speed
 Lower engine performance
Experience in operation shows that, with periodic cleaning during operation, the interval
between overhauls can be extended. The wet cleaning of a turbine described in the following
can be used for 4-stroke applications with heavy deposits (such as MDO and HFO applica-
tions, for example). Generally, turbine cleaning is not required for the other applications.
Periodic cleaning of the turbine during operation never replaces the service work where the
turbocharger is 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.
Cleaning interval
The time period between the periodical cleaning cycles depends greatly on the operating con-
ditions. Cleaning should normally be every 50 to 200 hours of operation.
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Revision B
March 2013