ABB TPS48-F Series Operation Manual page 54

Operation Manual / TPS44-F.. - TPS61-F..
5 Maintenance / 5.3 Turbine cleaning during operation
5.3.2 Prerequisites
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CAUTION
Risk of corrosion and deposits
Impairment and damage of turbocharger by salt water and cooling wa-
ter additives in flow ducts
Don't use salt water for cleaning, but only clean fresh water.
u
Avoid corrosion on casing inner surfaces.
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Let engine run for 10 minutes after wet cleaning.
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CAUTION
Maximum temperature in front of turbine during cleaning
When cleaning, the temperature in front of the turbine will rise and can
heavily stress the material of turbine components. The temperature at
the turbine inlet can be up to 100 °C higher than the exhaust gas tem-
perature after the cylinder. This should be taken into consideration
when setting the operating point before cleaning.
Don't exceed maximum temperature in front of turbine when clean-
u
ing.
CAUTION
Impermissible thermal stressing and flooding of the turbine
Smaller volumes of water can result in poor cleaning. Larger volumes of
water lead to impermissible thermal stressing of the turbine compon-
ents and can cause flooding of the turbine.
Be absolutely sure to observe turbine cleaning parameters.
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NOTICE
V-engines
In the case of V-engines with several turbochargers on each engine, we
recommend parallel cleaning of both turbochargers. This cleaning pro-
cess is faster and the risk of turbocharger surging is reduced.
Recommended operating state for turbine wet cleaning
The following operating state is tested and approved by ABB Turbochar-
ging:
Characteristic / com-
ponent
Engine load (guide value)
Turbine inlet temperature
T before water injection
TE
HZTL2412_EN
Conditions
short
Water injection time
20 ... 40 %
350 ... 400 °C
long
Water injection time
350 ... 430 °C
Rev.G March 2020