5.3 Cleaning the compressor during operation (part-1)



NOTE

These guidelines for wet cleaning apply exclusively for cleaning with clean water and are subject to permission for the procedure being obtained from the engine manufacturer.

The dirt in the compressor stage (compressor wheel and diffuser) depends on the cleanness of the air drawn in and the operating point.

A deposit of dirt in the flow ducts will be formed if the following substances are present in the intake air:

·         Oil or saline mist
·         Solid combustion residues
·         Dust of various kinds
Soiling of the compressor stage has a negative effect on compressor efficiency and charging pressure, particularly for smaller turbochargers.

This results in higher exhaust temperatures and increased fuel consumption by the engine. Contamination of the compressor also increases the rotor imbalance.

Periodic cleaning of the compressor in operation prevents or retards a severe increase in soiling, but in no way replaces the regular servicing work, during which the turbocharger is completely dismantled.


Interval between cleanings
The interval between periodic cleaning depends in large measure on the operating conditions. In general, cleaning should be carried out every 25  to 100 operating hours.

NOTE

Should the prescribed cleaning intervals prove incompatible with the operation of the ship, please contact ABB Turbo Systems.
 
Cleaning method
The compressor is cleaned while operating using the cleaning method described in the following. This method has been tested and is approved by ABB Turbo Systems:

·         Wet cleaning

Principle of wet cleaning
Water is injected before the compressor wheel via an injection pipe fitted in the filter silencer or the suction branch in order to clean the compressor stage in operation.

The water does not act as a solvent in the process, but the deposit is removed by the mechanical impact of the drops. The process is ideal, provided the soiling is not too advanced.

CAUTION

Due to the danger of corrosion, only clean water may be used, and on no account salt water. The water should also contain no cooling additives, which could form deposits in the flow ducts.

Cleaning more than one turbocharger compressor
If several turbochargers are installed on one engine, we recommend cleaning the turbocharger compressors one after the other.
  
V-engines
For V-engines with several turbochargers on each engine, we recommend parallel cleaning of the compressors. This cleaning process is faster and avoids the risk of engine surging.

Register supercharging
With register supercharging it must be ensured that both turbocharger compressors are cleaned regularly, especially following periods of operation in the lower performance range.


          1. Purpose of the manual
          2. Layout and function
          3. Correct use of the turbocharger
          4. Essential information
          5. Abbreviations and symbols
          6. Turbocharger rating plate
          1. Basic safety instructions
          2. General safety instructions
          3. Special safety instructions
          4. Safety instructions and hazard protection
          5. Warnings on the turbocharger
          1. Oil supply
          2. Inspection work
          3. Putting into operation after laying up
          1. Servicing work
          2. Monitoring
          3. Emergency mode TPL..VA
          4. Surging of turbocharger
          5. Contact with rotating parts
          6. Shutting the engine down
          1. Foreword to MaintenanceServicing work
          2. Cleaning the filter silencer
          3. Cleaning the compressor during operation
          4. Cleaning turbines and guide blades in operation
          1. Possible remedies for failures
          1. Turbocharger weights
          2. Remove the turbocharger
          3. Installing the turbocharger
          1. Module weights
          2. Remove filter silencer/air suction branch and compressor casing
          3. Removing cartridge group
          4. Axial clearance
          5. Disassembling and assembling the turbine diffuser
          6. Dismantle the VTG unit together with the gas inlet casing
          7. Installing the VTG unit and gas inlet casing
          8. Installing the cartridge group
          9. Install filter silencer/air suction branch and compressor casing
          10. Table of tightening torques
          1. Possibilities for emergency repair
          2. Fitting the cover plate
          3. Blocking the inlets and outlets
          4. Bypass the turbocharger
          1. Taking out of operation for up to 12 months
          2. Taking out of operation for more than 12 months
          1. Ordering spare parts
          2. Directory of part numbers
          3. General view of turbocharger
          4. General view of cartridge group
          5. General view of VTG unit



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