EGR System

Technical Management
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What is your experience with EGR System regarding:

  1. deposits in Air Cooler / Scavenge receiver ?

  2. any issues in Liners / piston crowns / rings?

  3. how you manage / treat EGR Drains & Sludges?

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Our experience with M/E EGR systems has been good so far.
The main factor that affects the amount of deposits and EGR drains or sludges is the type of fuel consumed. Several EGR systems are designed for low Sulphur fuels 0.1%S MGO while others are designed for high Sulphur fuels (0.5%S or even 3.5%S).
This is to be checked and confirmed with Makers.
In the case of high Sulphur fuels then you would expect more deposits and a higher quantity of EGR drains and sludges. Of course, the EGR water treatment system should be adequately specified for high or low Sulphur fuels (whichever is the case)
As far as the cylinder condition is concerned (liners, crowns and rings), it is hard to correlate possible issues, solely, with the operation of M/E EGR.
In general the following practices are recommended:

  1. Frequent M/E scavenge space inspections and measurement of the cermet coating on the piston rings (as far as practicable)
  2. Frequent M/E scavenge space cleaning and unclogging of the drain pipes (as far as practicable)
  3. Frequent M/E scrapedown analysis by shore laboratories
  4. Checks of the M/E EGR system according to the attached service letter (copy/paste the below link).
    A common root cause of issues faced in M/E EGR systems is that they remain idle for a long time, since they are used only in NECA areas.
    https://www.man-es.com/docs/default-source/service-letters/sl2020-699.pdf?sfvrsn=dc01129d_6