Operation Manual / TPL69-A10 / -A30 ... TPL77-A10 / -A30
5 Maintenance / 5.4 Cleaning turbine blades and nozzle ring in opera-
tion
© Copyright 2018 . All rights reserved.
HZTL2481_EN
Revision C
May 2018
Recommendation for wa-
ter pressure
It is necessary to have the corresponding water pipe pressure in order to
achieve the correct water flow rate (see table Cleaning parameters). If
the 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.
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 unaccept-
able volume of water collects in the gas outlet casing. To avoid this, a
drainage system for the gas outlet casing should be installed and open
during the cleaning process. If a drainage system is not provided, the in-
jected 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.
Points to remember when
cleaning
The following points must be observed with regard to draining the gas
outlet casing:
¡
The exhaust gas temperature behind the turbocharger drops signi-
ficantly when cleaning (typical turbocharger outlet temperatures dur-
ing 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 drainage of the gas outlet casing is omitted, 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. Indicators for this are a sudden severe drop in the
turbocharger speed or a very large increase in the gas inlet temperat-
ure. In such cases, the cleaning operations must be stopped and the
cleaning cycle restarted with reduced water pressure or higher en-
gine load.
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