ABB TPL73-B12 - Page 72

Operation Manual / TPL73-B.. - 85-B11/ -B12
5 Maintenance / 5.5 Cleaning turbine blades and nozzle ring in opera-
tion
© Copyright 2018 . All rights reserved. HZTL2480_EN Revision D July 2018
5Stainless-steel piping 11Orifice (integrated into tur-
bocharger)
6Other turbochargers 21Air line from the compressor
casing
7Injection nozzle item 7a or 7b APosition 1
BPosition 2
Operating the wet clean-
ing system
w Before cleaning, the Operating state prerequisites for wet cleaning
must be met.
u Check that the water supply (1) is open and safeguarded and that it is
also connected to the regulating valve (2) before the turbocharger.
u Set drain cock (9) of drain pipe (8) on gas outlet casing to Position 1
and check whether exhaust gas escapes.
u Quickly open regulating valve (2) until manometer (3) indicates follow-
ing pressure: injection nozzle (7a) 1±0.2bar or injection nozzle (7b)
3...3.5bar.
u Inject water for 5 minutes (injection nozzle 7a) or 10 minutes (injec-
tion nozzle 7b) at constant engine output.
u Check whether the exhaust gas temperature decreases following the
turbine.
u Close regulating valve (2).
u 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).
u Disconnect water supply (1) to regulating valve (2).
u After cleaning, wait with engine running for at least 10 minutes
without changing load to allow turbocharger to dry.
NOTICE
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 Turbochar-
ging Service Station.
NOTICE
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 / reli-
ability.
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