Marine Copper Centrifugal Pump

I. Product Overview

Marine copper centrifugal pump is a key general equipment in the ship's fluid transportation system. It adopts the centrifugal force-driven fluid transportation principle. Through the high-speed rotation of the copper alloy impeller, negative pressure is generated for liquid suction and positive pressure for liquid discharge, realizing the efficient transportation of various media such as seawater, fresh water, fuel oil, and low-concentration chemicals. The core advantages of the product focus on the excellent corrosion resistance of copper alloy materials (especially resistance to seawater salt spray erosion), outstanding thermal conductivity, no magnetic interference, and good machinability. At the same time, it has the characteristics of compact structure, small size, large flow rate, stable head, and low operating noise. It is the core equipment of ship systems such as seawater cooling, fresh water supply, fuel oil transportation, primary bilge water treatment, and domestic water circulation. The main flow-through components (impeller, pump body, pump cover) are made of high-quality copper alloys such as brass and bronze. The seals are made of nitrile rubber (NBR) or fluororubber (FKM). It is suitable for medium temperatures ranging from -20℃ to 120℃ with a service life of ≥8 years. Fully complying with IMO "Code for the Safety of Ship Machinery Systems" (MSC.328(90)), ISO 9906 Centrifugal Pump Energy Efficiency Standard and GB/T 10832 Marine Centrifugal Pump Technical Requirements, and having obtained type approval from mainstream classification societies such as CCS, LR, ABS, and BV, it is widely used in general fluid transportation scenarios of various ships such as cargo ships, oil tankers, passenger ships, fishing boats, research vessels, and engineering ships.

II. Core Technologies

1. Key Technical Parameters

Flow Range: 5-300m³/h, graded and adapted according to impeller diameter (100-500mm) and rotation speed (1450-2900r/min), with flow pulsation rate ≤3% under rated working conditions

Head Range: 5-120m, which can meet different head requirements such as seawater cooling (5-30m), fresh water pressurization (10-50m), fuel oil transportation (15-80m), and high-pressure flushing (80-120m)

Medium Compatibility: Capable of transporting seawater, fresh water, No. 0/-10 diesel oil, 46-150# lubricating oil, sewage with solid content ≤1% (particle size ≤0.5mm), and low-concentration acid-base solutions (pH 4-10), suitable for medium viscosity ≤200cSt

Rotation Speed Range: 1450r/min (adapted to 50Hz power supply), 2900r/min (adapted to 60Hz power supply), which can be directly linked and driven with ship generators and diesel engines, and some models support frequency conversion speed regulation

Self-priming Performance: Self-priming height ≥2.5m (for clean water), priming time ≤80 seconds. Models equipped with self-priming devices can have the self-priming height increased to 4.0m and can start without priming

Energy Efficiency Level: Complies with ISO 9906 Level 2 energy efficiency standard, 10%-15% more energy-efficient than ordinary centrifugal pumps, with efficiency ≥75% under rated working conditions

2. Safety Protection Design

Anti-cavitation Protection: Adopts optimized impeller inlet design (enlarged inlet diameter, optimized blade surface), with net positive suction head (NPSH) ≤3.5m, avoiding cavitation damage to the copper alloy impeller during high-speed rotation

Sealing Protection Upgrade: Adopts a dual structure of mechanical seal + labyrinth seal. The sealing surface is made of silicon carbide-graphite paired materials, adapted to copper alloy flow-through components, with leakage ≤0.01mL/h and resistance to seawater erosion

Vibration and Impact Resistance: The pump body and base adopt elastic shock absorber + stiffener design, which can withstand ship heel ±30°, trim ±20°, and vibration acceleration of 15g, with excellent operating stability

Explosion-proof Adaptation: Fuel oil transportation models can be equipped with Ex d IIB T4 Gb explosion-proof motors, adapted to Zone 1/2 hazardous areas of ships. Copper alloy components have no risk of static accumulation and are safer to use

Overload and Overheating Protection: Equipped with motor overload protector and pump body temperature sensor. When the current exceeds 1.1 times the rated value or the pump body temperature exceeds 120℃, it will automatically shut down and alarm to protect the pump body and drive system

III. Technical Advantages and Innovative Design

1. Enhanced Exclusive Advantages of Copper Alloys

Super Strong Seawater Corrosion Resistance: A dense oxide film is formed on the surface of copper alloy flow-through components, which can withstand long-term seawater immersion and salt spray erosion. No rust occurs in 1000-hour salt spray test. The service life is 60% longer than that of cast iron centrifugal pumps, adapting to the high-salt-spray marine environment of ships

Efficient Heat Conduction and Anti-cavitation: The thermal conductivity of copper alloy is more than 3 times that of cast iron, which can quickly dissipate the operating heat inside the pump, reduce the temperature of the medium inside the pump, and reduce the probability of cavitation. It is especially suitable for high-speed and long-term continuous operation scenarios

No Magnetic Interference: Copper alloy is a non-magnetic material, which can be adapted to special scenarios sensitive to magnetism such as research vessels and military ships, and will not interfere with the normal operation of ship navigation and detection equipment

2. Efficient Energy-saving Optimization

Impeller Hydrodynamic Optimization: Adopts a twisted blade impeller designed by 3D simulation, which reduces fluid resistance and improves fluid kinetic energy conversion efficiency. Under rated working conditions, the efficiency is 8%-12% higher than that of traditional impellers, and energy consumption is reduced by 10%-15%

Frequency Conversion Adaptation Design: Some models support frequency conversion speed regulation, which can automatically adjust the rotation speed according to the transportation flow demand. Under low flow working conditions, energy consumption is reduced by 20%-30%, avoiding energy waste when large flow is not needed

Low Resistance Flow Channel Design: The pump body flow channel adopts a smooth arc design, which reduces fluid eddy current and friction loss. The flow channel resistance is 15% lower than that of traditional centrifugal pumps, further improving transportation efficiency

3. Easy Operation and Maintenance

Modular Disassembly and Assembly Structure: Core components such as pump cover, impeller and seal adopt quick-release connection. Maintenance can be completed without disassembling the entire pipeline. Copper alloy components are light in weight (30% lighter than cast iron), making disassembly and assembly more labor-saving, and maintenance time ≤30 minutes

Intelligent Status Monitoring: Equipped with pressure, temperature and vibration sensors, key operating parameters are displayed in real time; optional remote monitoring module can synchronize data to the ship's central control system, allowing operation and maintenance personnel to predict faults remotely

Generalization of Wearing Parts: The generalization rate of wearing parts such as seals, bearings and impeller nuts for different flow models is ≥85%. Copper alloy wearing parts can be directly replaced, reducing the inventory pressure of ship spare parts and lowering operation and maintenance costs

4. Wide Scene Adaptability

Quick Adaptation to Multiple Media: By replacing seals of different materials and copper alloy impellers (brass/tin bronze/aluminum bronze), it can quickly adapt to different media such as seawater, fresh water, fuel oil and low-concentration chemicals, realizing "one pump for multiple uses"

Dual Installation Modes: Conventional models support bolt-fixed installation (adapted to fixed positions in the engine room); small models are equipped with portable handles, which can be flexibly moved to temporary transportation scenarios (such as emergency water supply and local flushing) to meet different deployment needs

Low-temperature/High-temperature Adaptation: Low-temperature models can be optionally equipped with thermal insulation sleeves, which can quickly preheat the pump body in -20℃ environment to avoid medium solidification; high-temperature models adopt high-temperature resistant seals and copper alloy impellers, which can be adapted to 120℃ high-temperature fresh water transportation

IV. Typical Application Scenarios

1. Ship Seawater Cooling System

Main Engine Seawater Cooling: The 15000kW cargo ship main engine is equipped with a tin bronze centrifugal pump (flow rate 80-120m³/h, head 20-30m) to extract seawater for cooling components such as the main engine cylinder liner and turbocharger. The copper alloy is resistant to seawater erosion, and efficient heat conduction ensures cooling effect and stable continuous operation

Air Conditioning Seawater Cooling: The passenger ship central air conditioning system adopts a brass centrifugal pump (flow rate 30-50m³/h, head 10-15m) to transport seawater for cooling the air conditioning condenser. It has small volume and low noise (≤70dB(A)), adapting to the narrow space of the passenger ship engine room

2. Fresh Water Supply and Circulation System

Domestic Fresh Water Supply: Ocean-going passenger ships adopt brass centrifugal pumps (flow rate 50-80m³/h, head 30-50m) to pressurize and transport fresh water from the fresh water tank to the washing and drinking water supply points of each cabin. The copper alloy material is hygienic and non-toxic, complying with the ship drinking water equipment standards

Fresh Water Cooling Circulation: The engineering ship generator is equipped with an aluminum bronze centrifugal pump (flow rate 40-60m³/h, head 25-40m) to circulate and transport high-temperature fresh water to the cooler. The aluminum bronze is resistant to high temperature and corrosion, adapting to the high-temperature working condition of the generator

3. Fuel Auxiliary Transportation System

Fuel Tank Supply: Coastal cargo ships adopt brass centrifugal pumps (flow rate 20-40m³/h, head 40-60m) to transport shore-based diesel oil to the ship's fuel tank. The explosion-proof motor design is adapted to the hazardous area near the fuel tank, and the copper alloy has no risk of static accumulation

Fuel Filtration Circulation: During the maintenance of the oil tanker fuel system, a tin bronze centrifugal pump (flow rate 15-30m³/h, head 20-30m) is used to transport fuel from the fuel tank to the filtration device, and the fuel flows back after impurity filtration. The copper alloy is resistant to sulfur-containing fuel erosion

4. Other Auxiliary Transportation Scenarios

Primary Bilge Water Lifting: Small fishing boats adopt brass centrifugal pumps (flow rate 5-10m³/h, head 10-20m) to lift bilge water containing a small amount of impurities to the primary filtration device. The copper alloy is resistant to sewage corrosion, and the excellent self-priming performance eliminates the need for frequent cleaning

Special Medium Transportation for Research Vessels: Deep-sea research vessels adopt aluminum bronze centrifugal pumps (flow rate 10-20m³/h, head 50-80m) to transport low-concentration seawater samples to the laboratory. The non-magnetic design will not interfere with the scientific research detection equipment and is resistant to deep-sea seawater corrosion