Cleaning Turbine And Nozzle Ring - ABB HT575925 Operation Manual

Operation Manual / 4 Product description / A100-M axial
6 Periodic maintenance / 6.5 Cleaning turbine and nozzle ring
6.5

Cleaning turbine and nozzle ring

6.5.1 Introduction
Approval by enginebuilder
These 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 Turbo Systems 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 turbines during operation prevents or delays any major increase in
contamination, but never replaces the regular service procedures where the turbocharger is
completely dismantled and mechanically cleaned.
6.5.2 Cleaning interval
The time period between the periodical cleaning cycles depends greatly on the operating
conditions. Cleaning should normally be done every 50 ... 200 hours of operation.
If the specified cleaning intervals are incompatible with the operation of the engine, contact
ABB Turbo Systems.
© Copyright 2017 ABB. All rights reserved. HZTL4033_DE Revision B December 2017