Cleaning The Turbine During Operation - ABB HT575750 Operation Manual

Operation Manual / 4 Product description / A130-M.. - A145-M..
6 Periodic maintenance work / 6.3 Cleaning the turbine during opera-
tion
6.3

Cleaning the turbine during operation

6.3.1 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.
Options and limits
Periodic cleaning during operation delays any major increase in contamination. The cleaning
method is suitable as long as the contamination has not progressed far. Very heavily con-
taminated components can no longer be cleaned using this method. In this case, ABB Turbo
Systems recommends having the contaminated components cleaned mechanically by an
ABB Turbocharging Service Station.
Periodic cleaning during operation does not replace the service work where the turbochar-
ger is completely dismantled and serviced by an ABB Turbocharging Service Station.
Cause and consequences of contamination
ABB Turbo Systems recommends the use of fuels with low ash, sulphur, sodium and vana-
dium contents.
The combustion of heavy fuel oil (HFO) in diesel engines causes contamination of the tur-
bine stage. Poor quality fuel in conjunction with high exhaust gas temperatures can lead to
extremely hard deposits on turbine components.
Consequences of contamination:
¡
Low turbine efficiency
¡
Elevated exhaust gas temperatures
¡
Increased charging and ignition pressures with increasing turbocharger speed
¡ Lower engine performance.
¡
After the engine is stopped the rotor may become stuck in contamination deposits.
6.3.2 Cleaning interval
The time period between the periodical cleaning cycles depends greatly on the operating
conditions. Cleaning should normally be done every 50 to 200 hours of operation.
If the specified cleaning intervals are incompatible with operation of the engine, contact
ABB Turbo Systems.
© Copyright 2017 ABB. All rights reserved. HZTL4031_EN Revision F August 2017