Variable-Frequency Control System for Main Engine Cooling Seawater Pump
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Product Introduction:
The variable-frequency, energy-saving system for the main engine cooling seawater pump is a prime example of “refined energy management” on ships. By shifting from the conventional “extensive,” constant-flow cooling approach to an intelligent, demand-based regulation strategy, it achieves:
Energy conservation and cost reduction (reducing fuel consumption)
Steady-State Operation (Optimizing Main Engine Performance)
Reduce maintenance (lower equipment wear)
Green and environmentally friendly (reducing carbon emissions)
With fuel costs remaining persistently high and environmental regulations—such as EEXI and CII—becoming increasingly stringent, these high-return energy-efficiency technologies are emerging as the preferred solutions for both newbuilds and retrofits of existing vessels.
Model: RE-SW-ESS
Electrical Specifications:
Input voltage: AC 380 V to 690 V, 3-phase, +6% to -10%, 50 to 60 Hz, ±5%
Compatible motor power: 30–200 kW
Output voltage: 0~AC 380V–690V, 3P
Output frequency: 0–300 Hz
Control method: V/F control
Working Conditions and Protection:
Ambient temperature: 0~45°C
Relative humidity: ≤90%
Pitch and Roll: 15° of transverse inclination, 22.5° of transverse roll, 5° of longitudinal inclination, and 7.5° of longitudinal roll.
Protection rating: Cabin IP44, Control station IP23
Certification and Standards:
Design and manufacturing standards: Comply with the IEC 60092 series of standards.
Class Society Certification: The product design complies with the standards of leading class societies, including CCS, ABS, DNV, LR, BV, RINA, NK, and KR. Product certificates from the relevant class societies can be applied for based on customer requirements.
Product Features:
1. Significant energy-saving effect:
2. Smooth soft start and stop to reduce equipment shock:
3. Precise temperature control to optimize the operating conditions of the host unit:
4. Reduce maintenance costs and operating noise:
5. Possess redundancy and emergency functions:
Application scope: oil and chemical tankers, container ships, bulk carriers, ro-ro passenger vessels, cruise ships, etc.
Case:
Guangzhou Shipyard International Co., Ltd.: Variable-frequency control system for the seawater pump on a 1,250-TEU methanol dual-fuel container vessel.
Main parameters: Input voltage: AC 440 V, 3-phase, 60 Hz
Motor voltage: AC 440 V, 3-phase, 60 Hz
Motor power: 37 kW
Motor speed: 1800 rpm
Ambient temperature: 0~45°C
Relative humidity: ≤90%
Pitch and Roll: 15° of transverse inclination, 22.5° of transverse roll, 5° of longitudinal inclination, and 7.5° of longitudinal roll.
Protection rating: IP44
Classification Society: ABS
Three variable-frequency drives are used to independently control three 37-kW seawater pumps, operating in a redundant “two-for-one-backup” configuration to enhance system stability. Simultaneously, PID control compares the measured actual temperature with the setpoint and makes real-time fine adjustments to the pump speeds, thereby maintaining the main engine cooling water temperature at a more precise and stable setpoint. This approach achieves energy savings and emission reductions.
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