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The fuel oil service system typically consists of two service tanks and two service pumps. This configuration is designed to ensure redundancy and reliability in fuel supply. By having two tanks, the system can provide fuel continuously while allowing for maintenance or refueling of one tank without disrupting operations. The presence of two service pumps further enhances the system's reliability; if one pump fails or requires maintenance, the second pump can maintain fuel flow to critical systems. This redundancy is essential in marine engineering to ensure safety and operational continuity, especially in environments where equipment failure could lead to significant consequences. Thus, the inclusion of two service tanks and two service pumps is not only a design choice but also a safety consideration in the design of the fuel oil service system.