ABB HT557844 - Page 80

Operation Manual / 4 Product description / A150-M.. - A155-M..
6
Periodic maintenance work
Page 48 /
120
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HZTL4032_EN
Revision F
January 2017
6.3.5 Prerequisites
Two different turbine cleaning devices are available for the turbochargers A150-M and A155-M
with single-inlet turbine casing:
 Device consisting of one cleaning nozzle per gas inlet on turbine casing
 Device consisting of six cleaning nozzles with connecting pipe for water and scavenging
air
Characteristic/component
Conditions
Cleaning device
one cleaning nozzle per gas inlet
six cleaning nozzles
Engine load (guideline value) 20 … 40 %
*) Turbine inlet temperature T
TE
before water injection
350 … 430 °C
Stabilisation phase after T
TE
has
been reached
10 minutes
Stabilisation phase after turbine
cleaning
10 minutes
Water supply ensured
Water temperature
5 … 30 °C
External air supply - - optional
Water pressure (overpressure
compared to atmosphere) p
WT
1.5 bar
2.5 bar
External air pressure p
PA
- - 1 bar
Table 12: Turbine wet cleaning, recommended operating state
*) The temperature at the turbine inlet can be up to 100 ℃ higher than the exhaust gas tem-
perature after the cylinder. This must be taken into account when setting the operating point
before cleaning.
If necessary, the engine performance must be reduced to meet these conditions.
The cleaning cycle can be started when the above conditions are fulfilled.
6.3.6 Carrying out wet cleaning of the turbine
CAUTION
Inadmissible thermal stress and flooding of the turbine
Smaller amounts of water can lead to an inadequate cleaning result. Larger
amounts of water lead to inadmissible thermal stress on the turbine compo-
nents and can cause flooding of the turbine.
 It is imperative that turbine cleaning parameters are observed.