Cleaning The Turbine During Operation - ABB HT611362 Operation Manual

Operation Manual / A150-M56/66/57/67 - A155-M..
7 Periodic maintenance work / 7.3 Cleaning the turbine during opera-
tion
7.3

Cleaning the turbine during operation

7.3.1 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.
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, Turbo Sys-
tems recommends mechanical cleaning of the contaminated components.
Periodic cleaning during operation is not a substitute for the service work during which the
turbocharger is completely dismantled and cleaned.
Cause and consequences of contamination
Turbo Systems recommends the use of fuels with low ash, sulphur, sodium and vanadium
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. Operating states with incomplete combus-
tion also increase the tendency to form deposits and must be avoided.
Consequences of contamination:
¡
Low turbine efficiency
¡
Elevated exhaust gas temperatures
¡
Increased charging and ignition pressures with increasing turbocharger speed
¡ Lower engine performance.
Possible damage to turbocharger:
¡
After the engine is stopped the rotor may become stuck in contamination deposits.
¡
Damage to turbine heads with blade breaks.
7.3.2 Cleaning interval
The time period between the periodical cleaning cycles depends greatly on the operating
conditions. Cleaning should normally be carried out every 50 to 200 hours of operation.
If the specified cleaning intervals are incompatible with operation of the engine, contact
Turbo Systems.
© Copyright 2022 ABB. All rights reserved. HZTL4032_EN Rev.S February 2022