Cleaning Turbine And Nozzle Ring - ABB HT608016 Operation Manual

Operation Manual / A170-M.. - A175-M..
7 Periodic maintenance / 7.5 Cleaning turbine and nozzle ring
7.5

Cleaning turbine and nozzle ring

7.5.1 Introduction
Approval by enginebuilder
The following instructions for wet cleaning only apply to cleaning with pure water and under
the precondition that the enginebuilder approves the process.
General
The combustion of heavy fuel oil (HFO) has the effect of contaminating the turbine stage
(turbine wheel and nozzle ring).
The use of fuels with poor quality in conjunction with high exhaust gas temperatures can
lead to extremely hard deposits on turbine components.
ABB Turbocharging recommends the use of fuels with low ash, sulphur, sodium and vana-
dium contents.
Consequences of contamination:
¡
Low turbine efficiency
¡
Elevated exhaust gas temperatures
¡
Increased charging and ignition pressures with increasing turbocharger speed
¡
Lower engine performance
¡
Rotor sticking after stopping the engine
Periodic cleaning of the turbine during operation prevents or delays any major increase in
contamination, but never replaces the regular service work where the turbocharger is com-
pletely dismantled and mechanically cleaned.
7.5.2 Cleaning interval
The time period between the periodical cleaning cycles depends greatly on the operating
conditions. Cleaning should normally be carried out every 50 ... 200 hours of operation.
If the specified cleaning intervals are incompatible with operation of the engine, contact
ABB.
© Copyright 2021 ABB. All rights reserved. HZTL4033_EN Rev.H July 2021