SL2023-744/SRJ Guiding overhaul intervals ME and dual-fuel type engines.

Updated tables Replaces SL2019-681/SRJ.  Based on the latest service experience and engine development we are pleased to issue a revised version of the guiding overhaul intervals tables. The guiding overhaul intervals apply to electronically controlled ME and dual-fuel type engines.

Longer overhaul intervals can be obtained with a condition-based overhaul strategy. The means to obtain and document this are described in SL07-483/HRR.
In addition, it must be noted that the application of, for example, WHR, EGB, EGR and SCR will affect the heat load on the combustion chamber components. Similarly, a more frequent heavy propeller running caused by the Energy Efficiency Design Index (EEDI) condition and the Adverse Weather Condition (AWC) software can have aninfluence. The above factors as well as fuel qualities and slow steaming will most probably have an impact on the overhaul intervals of especially, but not exclusively, components affected by the cylinder condition and combustion chamber parts. Application of PMI ACCo will have a positive influence on overhaul intervals.

All stated overhaul intervals are total engine running hours regardless of fuel type (HFO, MGO or gas). However, it must be noted that residual fuels (sulphur) will impact wear rates significantly.