ABB HT573930 Operation Manual page 68

Recommendation for
water pressure
Points to remember when
cleaning
Table of cleaning
parameters
© Copyright 2017 ABB. All rights reserved.
Maintenance
Cleaning turbine blades and nozzle ring
in operation
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 unacceptable
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 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 points must be observed with regard to draining the gas out-
let casing:
 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 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 turbo-
charger speed or a very large increase in the gas inlet temperature. In
such cases, the cleaning operations must be stopped and the cleaning
cycle restarted with reduced water pressure or higher engine load.
Wet cleaning parameters for turbine and nozzle ring
Product Maximum temper-
ature at start of
cleaning process
T [°C]
TI
TPL67-C 430
TPL71-C
Operation Manual / TPL67-C.. - TPL71-C..
5
5.4
Injection Water flow rate per turbocharger
time at p
t [min]
i
10
Page 66
= 3 bar
Water
M [l/min]
W
18
24