ABB TPL69-A33 Series Operation Manual page 63

Recommendation for
water pressure
Points to remember when
cleaning
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Operation Manual / TPL65-A32 / -A33 / -A36 + TPL69-A32 / -A33
Maintenance
Cleaning turbine blades and nozzle ring
in operation
To obtain the correct water flow rate, a certain pressure in the water pipe
is necessary (see table Cleaning parametersTPL-C: 3 nozzles - Cleaning
parameters for wet cleaning of turbine and nozzle ring). If the water pres-
sure is too low, the water flow rate specified in the table will not be ob-
tained. 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 reduc-
tion 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 vol-
ume 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 clari-
fied 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 (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 oc-
cur 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.
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