For vessels without a scrubber that spend all of their time in Emission Control Area (ECA) operation, using 0.1% sulphur content fuel is mandatory, and fuel tanks must therefore be properly prepared. Simply emptying the tanks and filling them with the new fuel may not be effective. It is very important that any 0.1% sulphur content fuels are not mixed with HFO. 

Therefore, system needs separate ULSHFO Storage-Settling-Service Tanks. One of existing HFO Storage tank can be used as ULSHFO Storage tank after cleaning very well. ULSHFO may need new transfer pump not to mix with HFO. Existing HFO Service & Settling tanks in E/R to be constructually divided to have ULSHFO Service & Settling tanks. All pipes for existing system (filling, transfer, overflow, heating coils, M/E & A/E service & return, sensors) to be integrated to Ultra Low Sulphur Heavy Fuel Oil (ULSHFO) system.