TCA Project Guide - Document - MAN Diesel & Turbo

2011-03-24 - de
MAN Diesel & Turbo 6
Turbine Cleaning
The turbochargers of engines operated with Heavy Fuel Oil (HFO), Marine
Diesel Oil (MDO) or Marine Gas Oil (MGO) must be cleaned prior to initial
operation and at regular intervals to remove combustion residue from the
blades of the turbine rotor and nozzle ring. Such deposits could otherwise
have a detrimental effect on the operating data or even cause strong vibration
of the turbine blades.
As standard, two cleaning methods are available:
▪ Wet cleaning of the turbine
▪ Dry cleaning of the turbine
Both cleaning methods can be used on the same turbocharger, and the
advantages of both cleaning methods complement one another.
Wet cleaning of the turbine is particularly suitable for cleaning the nozzle ring,
while dry cleaning of the turbine is particularly suitable for cleaning the turbine
rotor (turbine blades).
NOTE Observe the cleaning instructions on the instruction plate of
the turbocharger and in the operating manual.
Wet Cleaning of the Turbine
7
B
8
10
6
5
3
9
E 1
1 Water supply 8 Drain funnel
(water pressure: 2–3 bar) 9 Sealing air
2 Pressure gauge (extracted downstream of charge
air cooler)
3 Nozzles* 10 Gas outlet casing
4 Gas admission casing* B Drain cock
5 Nozzle ring* E Three-way cock with
6 Turbine rotor sealing air connection*
7 Water discharge * Scope of supply of turbocharger
Figure 2: Diagram “Wet cleaning of the turbine”
Wet cleaning is carried out during operation at greatly reduced engine load in
order to avoid overstressing the turbine materials (thermal shock).
One significant advantage of wet cleaning over dry cleaning is:
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