ABB TPL85-B14 Operation Manual page 69

NOTICE
NOTICE
Points to remember when
cleaning
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Maintenance
Cleaning turbine blades and nozzle ring
in operation
Close regulating valve (2).

Set drain cock (9) in drain pipe (8) on gas outlet casing to Position 2 to

keep drain pipe clean using air from compressor casing (21).
Disconnect water supply (1) to regulating valve (2).

After cleaning, wait with engine running for at least 10 minutes without

changing load to allow turbocharger to dry.
If the cleaning operation is not satisfactory, it may be repeated up to
two times.
If the cleaning result is still not satisfactory after three attempts and the
engine values are also unsatisfactory, we recommend that you have the
turbocharger inspected and cleaned by an official ABB Turbocharging
Service Station.
While the water is being injected, grinding noises might be heard at the
turbine end. These are caused by the turbine touching the cover ring
that shrinks due to cooling. This results in a minimal increase in the
clearance which, however, has no effect on the operating safety / relia-
bility.
 When cleaning, water must be drained from the gas outlet casing via
the drain pipe (8).
 The exhaust gas temperature following the turbocharger sinks during
cleaning (by 60 ... 180°C).
 Water might (but need not necessarily) flow out of the drain pipe, de-
pending on the engine load. This flow might not start for 2 ... 3
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. Signs of this are a sudden significant drop in turbo-
charger speed or a very strong increase in the gas inlet temperature.
In such cases, cleaning must be stopped and the cleaning cycle re-
peated from the beginning using a lower water pressure or higher en-
gine load.
Operation Manual / TPL85-B14/-B15/-B16
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