Operation Manual / TPS48-D/E.. - TPS61-D/E..
Maintenance
5
Turbine cleaning during operation
5.3
Page 60
Apr
il 2015
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Turbine cleaning during operation
5.3
The combustion of fuels such as heavy fuel oil (HFO) in diesel engines
produces contamination of the turbocharger's turbine components. In
combination with a high exhaust gas temperature, poor quality fuel can
lead to particularly hard deposits on the nozzle ring and especially on the
gas outlet flange.
ABB Turbo Systems recommends using fuels with a low ash, sulphur,
sodium and vanadium content.
Consequences of contamination:
Poor turbine efficiency
elevated exhaust gas temperatures
higher charging and ignition pressures as turbocharger speed rises
lower engine performance.
After stopping the engine, the rotor can become stuck in contamination
deposits.
Experience with turbocharger operation shows that the intervals between
overhauls can be extended if cleaning while in operation is carried out
periodically. Wet cleaning the turbine, as described below, should be used
for 4-stroke applications when there are heavy deposits from, for example,
HFO.
Under no circumstances is periodic cleaning of the turbine during
operation a substitute for the service work carried out when the
turbocharger is completely dismantled and cleaned mechanically.
Turbines which are very heavily contaminated cannot be cleaned this way
any longer. In this case, the contaminated components must be
mechanically cleaned by an ABB Turbocharging Service Station.
NOTICE
Regular cleaning
Regular turbine cleaning during operation prevents or delays excessive
build-up of contamination.
5.3
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