The paper describes the problems of maintaining the operational readiness of vessels, which are required to meet a specific time to enter service. Most often, for tugs and duty vessels, this time ranges from 5 minutes to two hours. A time of 5-10 minutes is only achievable for vessels with active propulsion systems and only under specific operational states. Conversely, taking a vessel out of service for longer than 1 hour (due to the need for inspection, maintenance, repair work, or overhauls) requires reporting the necessity of such a state and obtaining approval.Active propulsion systems are used on specialized vessels due to their significantly greater maneuverability (azimuth and cycloidal thrusters) compared to traditional ship propulsion. Such vessels are most often required to maintain maneuverability in the event of a failure of one of the independent propulsion systems and during a temporary loss of electrical power in the ship’s grid (blackout) [1].
As a result, a minimum of two independent propulsion systems are used. As a result of the failure of one of them, maneuverability deteriorates, but it still remains at the level of maneuverability of vessels with traditional propulsion. A serious problem is the temporary lack of electrical power. Depending on the solution, further operation in this state is possible for a time ranging from 10 minutes to about 1 day. This depends on the reserve (…)
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Source: Logistyka Magazine