ABB HT842305 Operation Manual page 61

Operation Manual / TPL85-B14/-B15/-B16
5 Maintenance / 5.5 Cleaning turbine blades and nozzle ring in opera-
tion
Dry-cleaning interval
Principle of wet cleaning
Principle of dry cleaning
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The interval between periodic cleaning is very dependent on the operat-
ing conditions. As a rule, cleaning should be carried out every 25 to 50
operating hours.
Cleaning methods
Several methods are possible for cleaning the turbine and nozzle ring
during operation. The cleaning methods described in the following have
been tested and are recommended by ABB Turbo Systems:
¡
Wet cleaning
¡
Dry cleaning
Wet cleaning makes use of various effects. Depending on the composi-
tion of the contamination, the individual effects with their different
levels of intensity have a varying influence on the cleaning result:
¡
Erosion
The dirt is removed by the mechanical action of the impacting water
droplets.
¡
Solubility
Water solubility of the contamination deposits in water.
¡
Thermal shock
Spalling of contamination due to temperature difference.
CAUTION
Corrosion and deposits when cleaning
Damage and impairment of turbocharger parts due to salt water and
cooling water additives
Don't use salt water for cleaning, but only clean fresh water.
u
When dry cleaning using dry solid matter in granulate form, dirty depos-
its are removed mechanically by the grains impacting the surface.
NOTICE
Wet and dry cleaning are equally effective. However, it may be useful to
apply both methods together.
HZTL2491_EN Revision C August 2018