ABB A155-M66 Operation Manual page 65

Operation Manual / A150-M56/66/57/67 - A155-M..
7 Periodic maintenance work / 7.3 Cleaning the turbine during opera-
tion
7.3.3 Cleaning method
The turbine components are cleaned during operation using the wet cleaning method. This
cleaning method is tested and approved by ABB Turbocharging.
The precondition for wet cleaning is that the enginebuilder approves the process and these
regulations are observed.
V-engines
On V-engines with several turbochargers per engine, parallel cleaning of both turbochargers
is recommended. This cleaning process is faster and reduces the risk of surging of the tur-
bocharger.
7.3.4 Function and safety of wet cleaning
CAUTION
Corrosion and deposits when cleaning
Salt water and cooling water treatment substances damage and adversely
affect turbocharger parts.
Never use salt water, but only pure water for cleaning.
u
To clean the turbine stage during operation, water is injected before the nozzle ring. Based
on an injection phase of 10 minutes, this cleaning procedure uses the principle of water solu-
bility of dirt deposits.
To prevent corrosion of the inside surfaces of the casings, the engine must be continued to
be operated for 10 minutes after a wet cleaning. The exhaust gas temperature downstream
of the turbocharger can drop by up to 180 °C during cleaning.
© Copyright 2021 ABB. All rights reserved. HZTL4032_EN Rev.Q January 2021