The following content covers the entire process from the core direction of the transformation, system design, equipment selection, construction and commissioning, to fault avoidance. All are practical operation contents that can be directly implemented and are compatible with mainstream domestic and imported CPP thrusters such as SMMC CPP.
1. Core pain points of outdated systems (main triggers for renovation)
Control mode: Analog quantity/relay control, with low pitch adjustment accuracy (above ±1°) and slow response, unable to meet the precise navigation requirements of ships.
Monitoring capability: Without real-time data collection, relying solely on manual inspection, key parameters such as hydraulic oil pressure, oil temperature, and pitch Angle cannot be monitored, resulting in delayed fault detection.
Interactivity: It operates independently of the main engine, steering gear and power distribution system, and cannot achieve the coordination of "speed - pitch - rudder Angle", resulting in high energy consumption and poor maneuverability.
Reliability: The circuit is aging, the contacts are oxidized, the rate of fault shutdown is high, and there is no emergency bypass function. After a fault, it is easy to cause the pitch to get stuck, affecting navigation safety.
Maintainability: No fault record or diagnostic function. Maintenance requires manual inspection. Maintenance at sea is difficult and time-consuming.
2. Core prerequisites for renovation (Avoiding construction rework and ensuring matching)
Mechanical-hydraulic system integrity inspection: First, inspect the CPP hub, hydraulic pump station, servo valve, pipelines, etc., to confirm there is no seal leakage, mechanical jamming, or failure of hydraulic components. Electrical modifications need to be matched with the parameters of the hydraulic system.
Classification society regulations confirmation: The renovation plan needs to be filed with classification societies such as CCS/ABS/LR in advance. Core equipment must have Marine certification to avoid failure in acceptance.
Working condition requirement sorting: Based on the type of vessel (engineering ship/cargo ship/passenger ship) and navigation conditions (constant speed/variable conditions, inland river/ocean), determine indicators such as control accuracy, response time, and redundant design (for example, engineering ships need rapid pitch reversing, and ocean-going ships need high reliability);
Assessment of the reuse of the existing system: Conduct insulation and performance tests on sensors, distribution cabinets, cables, etc. that are still usable, rationally reuse them to reduce the cost of renovation, and it is recommended to replace all core control circuits.
