ABB HT564330 Operation Manual page 67

Recommendation for
water pressure
NOTICE
Points to remember when
cleaning
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Maintenance
Cleaning turbine blades and nozzle ring
in operation
After cleaning, wait with engine running for at least 10 minutes without

changing load to allow turbocharger to dry.
To obtain the correct water flow rate, a certain pressure in the water pipe
is necessary (see table Cleaning parameters). If this water pressure is too
low, the water flow rate specified in the table will not be obtained. In this
case, the cleaning effect will be decreased. An improvement can be
achieved by reducing the load to below 10%.
Repeating cleaning cycles immediately after each other must be
avoided as this can lead to high mechanical loading and consequently
to a reduction in the service life of the components.
If cleaning is unsatisfactory, the length of the process can be extended.
If the injection time is extended, it must be ensured that no
unacceptable volume of water collects in the gas outlet casing. To avoid
this, a drainage system for the gas outlet casing must be installed and
open during the cleaning process. If a drainage system is not provided,
the injected volume of water can be controlled by a flowmeter in the
water supply. The maximum volume of water allowed in individual
cases must be determined together with an ABB Turbocharging Service
Station. The influence of the cleaning water on peripheral equipment,
such as a boiler, must be clarified by the operator.
The following must be observed where drainage of the gas outlet casing is
concerned:
 The exhaust gas temperature behind the turbocharger drops
significantly when cleaning (typical turbocharger outlet temperatures
during cleaning: 60 ... 180 °C).
 Depending on the engine load, water might run out of the drain pipe.
This outflow might not start for two or three minutes, or it might not
occur at all.
 If the gas outlet casing is not drained, the turbocharger speed and / or
the gas inlet temperature must be monitored during the cleaning
process. If the load is too low, water can collect in the gas outlet
casing. Signs of this are a sudden significant drop in turbocharger
speed or a very strong increase in the gas inlet temperature. In such
cases, cleaning must be stopped and the cleaning cycle repeated from
the beginning using a lower water pressure or higher engine load.
Operation Manual / TPL76-C
5
5.4 Page 65