Marine Copper Cooling Water Pump

I. Product Overview

Marine copper cooling water pumps are the "heat dissipation core" of ship power systems, designed specifically for cooling cycles of equipment such as diesel engines, generators, and turbochargers. They transport cooling media like freshwater and seawater to maintain equipment operating temperatures within a safe range (typically ≤95℃). Constructed with naval brass (HAl60-1-1) or tin bronze (ZCuSn6Zn6Pb3) as the main material, they achieve efficient media delivery through centrifugal pump principles — a power source (electric motor or main engine shaft drive) drives the impeller to rotate, generating centrifugal force to draw cooling media from water tanks/overboard, pressurize it, and circulate it through equipment cooling chambers to absorb heat before returning to the cooling source (e.g., seawater overboard discharge or freshwater closed-loop circulation). The pump body undergoes anti-corrosion treatment and precision machining, with a corrosion-resistant service life of ≥10 years in freshwater and low-salinity seawater environments. It meets IMO Ship Machinery Cooling System Specifications and cooling equipment certification requirements of classification societies such as LR and ABS, widely used in cooling systems of power equipment for inland ships, coastal cargo ships, passenger ships, and other vessel types.

II. Core Technologies and Material Characteristics

1.Copper Material Selection and Performance

2.Key Technical Parameters

Flow range: 10-300m³/h, suitable for equipment power 500-30,000kW (e.g., 10,000kW main engines require flow ≥50m³/h)

Head coverage: 15-50m, meeting pressure requirements for transportation from cooling sources to equipment cooling chambers (including pipeline elbows and valve resistance losses)

Medium compatibility: Capable of conveying freshwater (with corrosion inhibitors), low-salinity seawater (sediment content ≤2%), ethylene glycol antifreeze (concentration ≤30%), and cooling media with temperature ≤80℃

Suction performance: Suction lift ≥6m, net positive suction head (NPSH) ≤3.5m, suitable for low-level water tanks or overboard suction scenarios without additional priming devices

Operation efficiency: Hydraulic efficiency ≥85% (under design conditions), 8% higher than cast iron pumps of the same specification, saving up to 8000kWh/year per unit

3.Safety and Heat Dissipation Design

Equipped with temperature interlock devices: Automatically increases pump speed (flow increases by 20%) when equipment outlet water temperature ≥95℃; triggers alarms and starts backup pumps when temperature exceeds 100℃

Inlet fitted with debris-proof filters (5mm aperture) to intercept aquatic plants, sediment, etc., cooperating with open impeller designs to reduce clogging rates by 60% compared to closed impellers

Lightweight structure: 30% lighter than stainless steel cooling pumps of the same specification, with a single unit weight ≤500kg, suitable for installation on engine room tops or in narrow spaces

III. Technical Advantages and Innovative Design

1. Efficient Heat Dissipation and Conveyance Capacity

Low-resistance impeller design: Uses backward-curved blades and streamlined impellers, reducing hydraulic losses by 15% compared to traditional impellers and increasing flow by 10% under the same power, lowering main engine cooling water temperature by 3-5℃.

Wide-range flow regulation: Supports variable frequency speed control (50-50Hz), with flow steplessly adjustable in the 30%-110% rated range to adapt to heat dissipation needs under different equipment loads (e.g., flow reduces to 50% at main engine idle).

2. Corrosion Resistance and Wear Resistance Enhancement

All-copper flow channel system: Pump body, impeller, and shaft sleeve are made of homogeneous copper materials to avoid galvanic corrosion from contact between dissimilar metals, showing no significant rust after 3000 hours of immersion in 3% salt spray environments, especially resistant to seawater chloride ion erosion.

Wear-resistant impeller edges: Edges of tin bronze impellers are overlay-welded with nickel-based alloy (1mm thick) to achieve HRC50 hardness, improving sediment scouring resistance by 50% compared to pure copper impellers, suitable for inland sandy waters.

3. Adaptation to Ship Operating Conditions

Vibration-resistant structure: Pump units and bases use rubber shock absorbers + spring composite shock absorption, with vibration values ≤3.0mm/s, maintaining stable operation in high-vibration main engine room environments (pressure fluctuation ≤±0.05MPa).

Extreme angle operation: Flow attenuation ≤5% under ship heel ±20° and trim ±10° conditions, ensuring uninterrupted equipment cooling in severe sea conditions.

IV. Typical Application Scenarios

1. Main Engine and Generator Cooling

Low-speed diesel engine cooling: 15,000kW low-speed main engines are equipped with naval brass cooling water pumps (flow 80-120m³/h, head 30m) to deliver seawater to cylinder liners and piston cooling chambers, controlling inlet water temperature ≤35℃ and outlet temperature at 85±2℃, ensuring main engine thermal efficiency ≥45%.

Diesel generator cooling: 2000kW generators use tin bronze cooling water pumps (flow 15-25m³/h, head 20m) for freshwater closed-loop cooling of generator stators and rotors, stabilizing water temperature at 65-75℃ to avoid insulation aging from overheating.

2. Special Equipment Cooling

Turbocharger cooling: High-speed turbochargers are matched with small naval brass pumps (flow 5-10m³/h, pressure 1.6MPa) to deliver cooling water to turbocharger housings with flow precision controlled within ±2%, ensuring temperatures ≤80℃ at turbocharger speeds ≥15,000r/min.

Air conditioning condensation systems: Passenger ship central air conditioning uses naval brass cooling water pumps (flow 20-40m³/h, head 15m) to deliver seawater to condensers, cooperating with thermostatic valves to control condensation temperature at 40±3℃ and improve refrigeration efficiency by 8%.

3. Extreme Environment Adaptation

Tropical high-temperature heat dissipation: In 45℃ environments, copper pumps with heat sinks deliver seawater (inlet temperature 35℃) to main engine cooling systems at 100-150m³/h, ensuring outlet temperature ≤85℃ through enlarged impeller designs and preventing overheating shutdowns.

Polar low-temperature antifreeze: Tin bronze pumps in -30℃ environments convey 30% concentration ethylene glycol antifreeze at 50-80m³/h, with integrated electric heating jackets (3kW power) to prevent internal liquid freezing and ensure unobstructed cooling systems during low-temperature main engine startup.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Cooling medium: Naval brass pumps for seawater and low-salinity waters; tin bronze pumps for freshwater and sandy waters

Flow calculation: Configure 1.2 times the equipment heat load; e.g., a main engine with 5000kW heat load (requiring 0.1L/s cooling water per kW) requires flow ≥216m³/h

Pressure requirements: 1.6-2.0MPa models for high-pressure cooling systems (turbochargers, air conditioning condensers); 0.8-1.6MPa models for conventional main engine cooling

2. Maintenance Points

Daily monitoring: Check outlet pressure (fluctuation ≤±0.1MPa), bearing temperature (≤70℃), and mechanical seal leakage (≤1mL/h) every 600 hours

Regular maintenance: Clean inlet filters every 2000 hours; replace mechanical seals (oil-resistant fluoroelastomer) every 3000 hours; inspect impeller wear (allowable radial clearance ≤0.2mm)

Anti-corrosion maintenance: Circulate and clean seawater cooling pumps with 5% citric acid solution for 1 hour every six months to remove surface scaling (mainly calcium carbonate) and restore heat exchange efficiency

VI. Compliance and Certification

International standards: Complies with ISO 8861 marine diesel engine cooling system standards and IMO MSC.389(94) mechanical system guidelines

Classification society certifications: Passed type approval for cooling water pumps by LR, ABS, and CCS (including 2000-hour seawater circulation tests)

Material compliance: Flow-through components meet ASTM B149 (naval brass) and ASTM B584 (tin bronze) standards, ensuring compatibility with cooling media