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Operation Manual / Power2 550-M / High-pressure stage
7 Periodic maintenance / 7.4 Cleaning turbines and nozzle rings during
operation
© Copyright 2022 ABB. All rights reserved.
HZTL4058_EN
Rev.F
March 2022
Procedure
The prerequisites and operating state must be fulfilled prior to cleaning.
Fig. 28: Wet cleaning operation
u
Make sure that the water supply (01) is connected, switched on and safeguarded.
u
Open the drain pipe (08, 09) in the low-pressure stage, if present.
u
Switch the 3-way valve (04) from scavenging air mode to water supply.
u
Set the necessary water quantity on the flowmeter (11) according to the table in section
Cleaning parameters.
u
Shut off the water supply again by switching the 3-way valve (04) to scavenging air mode
after injecting the required volume of water.
The injection process is complete.
u
Shut the drain hole (if present) via the drain pipe (08, 09).
u
After cleaning, continue to operate the engine for at least 10 minutes without any load
change so that the pressure stages can dry.
It is necessary to have the corresponding water pipe pressure in order to achieve the correct
water flow rate (see table Cleaning parameters). If there is insufficient water pressure, the
water flow rate specified in the table will not be reached. A reduced cleaning effect can be
expected in this case.
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