ABB HT562587 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 of Cleaning Parameters). If this water pressure is
too low, the water flow rate specified in the table will not be obtained. In
this case, cleaning will not be so good. An improvement can be achieved
by reducing the load to below 10%.
Repeating cleaning cycles immediately after each other must be avoid-
ed 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 unaccepta-
ble 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 flow meter 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 boil-
er, 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 signifi-
cantly when cleaning (by 50 to 150°C).
 Depending on the engine load, water might run out of the drain pipe.
This outflow might not start for 2 or 3 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 pro-
cess. 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 / TPL67-C.. - TPL71-C..
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