Table 13: Cleaning Parameters Wet Cleaning Of Turbine And Nozzle Ring - ABB HT579397 Operation Manual

Operation Manual / 4 Product description / A100-M axial
6 Periodic maintenance / 6.5 Cleaning turbine and nozzle ring
Set the necessary water quantity on the flowmeter (08) according to the table Cleaning
u
parameters (see Table 13: Cleaning parameters Wet cleaning of turbine and nozzle ring
→44).
Shut off the water supply again by switching the 3-way valve (04) to scavenging air mode
u
after the prescribed injection time has elapsed.
The injection process is complete.
After cleaning, continue to operate the engine for at least 10 minutes without any load
u
change.
It is necessary to have the corresponding water pipe pressure in order to achieve the correct
water flow rate (see Table 13: Cleaning parameters Wet cleaning of turbine and nozzle ring
→44). If there is insufficient water pressure, the water flow rate specified in the table will
not be achieved. A reduced cleaning effect can be expected in this case.
Repetition of wet cleaning
The repeating of cleaning cycles one immediately after the other must be avoided as this
can lead to excessive mechanical stress, hence reducing the operating life of the compon-
ents.
If the cleaning process is ineffective, the duration can be extended. If the injection time is ex-
tended, it is important to ensure that no impermissible volume of water collects in the gas
outlet casing. A drainage system should be installed for the gas outlet casing and opened
during cleaning. If there is no drainage system, the amount of water injected can be mon-
itored with a flowmeter in the water supply. The permitted amount of water must be de-
termined with the help of an ABB Turbocharging Service Station.
To be observed during cleaning
¡
The action of the cleaning water on the peripheral units (such as boiler) must be clarified
by the operator.
¡
The exhaust gas temperature downstream of the turbocharger drops drastically during
cleaning (typical turbocharger outlet temperatures during cleaning: 60...180°C).
¡ If there is no drainage of the gas outlet casing, 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 temperature. In such
cases, the cleaning operations must be stopped and the cleaning cycle restarted with re-
duced water pressure or higher engine load.
Cleaning parameters for wet cleaning of turbine and nozzle ring
Product Maximum temperature
when starting cleaning
T
A170-M
A175-M
Table 13: Cleaning parameters Wet cleaning of turbine and nozzle ring
© Copyright 2017 ABB. All rights reserved.
Injection time
t
[°C]
TI
430
Water volume flow per turbocharger
[min]
i
10
HZTL4033_DE
at p = 3 bar
Water
V [dm³/min]
W
30
41
Revision B December 2017