(a) Describe, with the aid of a sketch, a main engine fuel oil circulation system incorporating the MGO and HFO service tanks, a fuel oil change-over system heating and viscosity control system and tank return system (10)
(b) Write instructions for changing the system described in part (a) of the question from MGO to HFO, indicating the checks to be made during the changeover (6)
UKM Tuticorin 
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