CYH Series Centrifugal Sea Water Pump for Corrosive Marine Applications
The centrifugal sea water pump is a single-stage, single-suction, cantilevered centrifugal pump designed in accordance with ISO standards. This pump is specifically designed for the efficient handling of seawater, brackish water, saltwater, alkaline, and mildly corrosive liquids, as well as other fluids with physical and chemical properties similar to freshwater and free of solid particles.
Designed for long-term seawater operation with superior corrosion resistance and stable performance.
- Duplex / Super Duplex material options
- Anti-corrosion & anti-cavitation design
- 20+ years marine & desalination experience
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Flow Rate Range : |
0.8m³/h~750m³/h |
|---|---|
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Head Range: |
3m~130m |
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Motor Power : |
2.2 kw~110 kw |
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Speed: |
968-3450 r/min |
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Medium Temperature Range: |
-20°C~165°C |
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Customizable Materials: |
Stainless steel (304, 316, 316L), Duplex steel, etc. |
Why Standard Pumps Fail in Seawater Applications
Seawater is one of the most aggressive fluids for industrial pumps. High salinity, chloride ions, and dissolved solids can rapidly damage standard centrifugal pumps, leading to unexpected failures and increased maintenance costs.
If your system operates in marine or desalination environments, using a standard pump design can result in serious operational risks:
Common Problems in Seawater Pumping Systems
- Severe Corrosion from Chloride Ions
Chloride-rich seawater causes pitting and crevice corrosion, especially in low-grade stainless steel such as 304. This leads to rapid material degradation and leakage. - Short Service Life & Frequent Replacement
Standard pumps are not designed for continuous seawater exposure, resulting in premature wear of impellers, casings, and shafts. - Cavitation & Performance Instability
Improper hydraulic design in seawater conditions can cause cavitation, vibration, and reduced efficiency. - High Maintenance & Downtime Costs
Frequent seal failures and corrosion-related damage increase maintenance frequency and total cost of ownership.
How CYH Centrifugal Sea Water Pump Solves These Problems
The CYH series is specifically engineered to handle the challenges of seawater environments:
- Advanced Corrosion-Resistant Materials
Available in 316L, Duplex (2205), and Super Duplex (2507) to withstand chloride attack. - Optimized Hydraulic Design
Reduces cavitation risk and ensures stable, long-term operation. - Heavy-Duty Structure for Marine Conditions
Designed for continuous duty in desalination plants, offshore platforms, and seawater cooling systems. - Extended Service Life with Lower Maintenance
Minimizes downtime and reduces lifecycle costs.
The centrifugal seawater pump is available in 304, 316, 316L,2205, 2507 stainless steel, and super duplex stainless steel materials, suitable for conveying seawater, brine, and organic solvents of various concentrations. Typical applications include ballast and firefighting systems on ships, seawater aquaculture operations, seawater desalination plants, seawater pressurization and lifting systems, and various industrial processes requiring reliable seawater conveyance.
Not sure if your current pump can handle seawater conditions?
Send us your operating parameters (flow rate, head, medium composition), and our engineers will recommend the most suitable solution within 24 hours.
Email: [email protected]
Phone: +86-13651913727
Application
Suitable for conveying medium with low flow rate, high flow rate, high head, low NPSH, high/low temperature, easy crystallization, easy solidification, flammable, explosive, easy vaporization, volatile, highly toxic, corrosive, precious, and clean particles.
Marine Industry
Ship ballast systems, marine firefighting, seawater cooling circulation
Aquaculture
Seawater supply for fish farms, water circulation in aquaculture tanks
Desalination Plants
Seawater intake, booster pumping for reverse osmosis systems
Power Plants
Cooling water circulation using seawater as the heat exchange medium
Port & Offshore Facilities
Seawater lifting, firefighting, and wash-down systems
Municipal Waterworks
Coastal water transfer projects and seawater lifting stations
Oil & Gas Industry
Offshore seawater injection, cooling & firefighting applications.
Features of our Centrifugal Seawater Pump
Improved Hydraulic Efficiency
Advanced hydraulic design delivers higher efficiency compared to conventional pumps.
High Reliability & Corrosion Resistance
Excellent corrosion resistance and reliable mechanical seal help prevent leakage and extend service life.
Flexible Installation & Easy Maintenance
Horizontal structure fits various pipeline layouts, with simple maintenance and quick part replacement.
Strong Anti-Cavitation Performance
Effectively reduces cavitation damage to the pump body and impeller.
Working Principle
The centrifugal seawater pump operates by converting mechanical energy from a driver—such as an electric motor, engine, or turbine—into kinetic and pressure energy of the liquid. As the impeller, mounted on the pump shaft, rotates at high speed within the pump casing, seawater enters through the suction side and is accelerated outward along the impeller blades. The casing then guides the flow, transforming the liquid’s velocity into pressure before discharging it through the outlet. This design enables continuous, efficient transfer of large volumes of seawater under stable pressure.
Parts of Centrifugal Sea Water Pump
A centrifugal sea water pump is primarily composed of the impeller, pump casing, and drive unit.
- The impeller is fixed to the pump shaft inside the casing, and when it rotates at high speed, seawater is drawn in through the eye of the impeller and expelled rapidly from the blade tips.
- The casing channels the flow and converts the kinetic energy into pressure, while bearings within the housing support the pump shaft.
- The drive unit supplies the rotational power required, commonly via an electric motor, though engines or turbines can also be used.
- Impelle: We use duplex stainless steel or 316L stainless steel (custom materials available). The impeller adopts a semi-open design to improve seawater passage efficiency. Its optimized hydraulic profile reduces cavitation and ensures stable operation in corrosive marine environments.
- Pump Casing: The pump casing is manufactured from corrosion-resistant stainless steel materials. It provides a reliable pressure boundary and ensures smooth flow guidance inside the pump. The reinforced structure maintains stable performance during long-term seawater operation.
- Shaft: The shaft is made of high-strength stainless steel with corrosion-resistant treatment. It is precisely machined to ensure accurate alignment and stable torque transmission, reducing vibration during continuous operation in marine applications.
- Mechanical Seal: We use silicon carbide or tungsten carbide mechanical seal materials. The seal structure is designed to prevent seawater leakage under high salinity and pressure conditions, ensuring reliable sealing performance and extended service life.
- Bearing Assembly: The bearing assembly is designed for continuous heavy-duty operation. It uses corrosion-resistant components to reduce friction and maintain stable shaft rotation, ensuring reliable performance under long operating cycles.
- Base Frame: The base frame is constructed from reinforced carbon steel with anti-corrosion coating. It ensures stable installation of the pump and motor, reduces vibration during operation, and supports flexible installation in marine environments.
Impeller
Pump Housing
Bearings
Pump Shaft
Sealing Method
Base bracket
Material Selection Guide
| Material | Corrosion Resistance | Application |
|---|---|---|
| 304 | Low | Fresh / weak brine |
| 316L | Medium | Mild seawater |
| 2205 Duplex | High | Seawater systems |
| 2507 Super Duplex | Extreme | Desalination / offshore |
Specifications of our Centrifugal Seawater Pump
| Item | Specification |
|---|---|
| Pump Type | Horizontal centrifugal sea water pump |
| Model | CYH Series |
| Flow Capacity | 0.8m³/h~750m³/h |
| Head Range | 3m~130m |
| Speed | 968-3450 r/min |
| Inlet / Outlet Diameter | DN32 – DN300 |
| Working Pressure | ≤ 1.6 MPa (higher pressure available on request) |
| Temperature Range | -20°C~165°C |
| Liquid Type | Seawater, brine, mildly corrosive liquids |
| Efficiency | Up to 82% (depending on model) |
| NPSH | Optimized for anti-cavitation performance |
| Seal Type | Mechanical seal (SiC / WC / optional cartridge seal) |
| Bearing Type | Heavy-duty rolling bearing system |
| Installation Type | Horizontal base-mounted |
| Drive Method | Electric motor / diesel engine coupling |
| Materials | Stainless steel (304, 316, 316L), Duplex steel, etc. |
| Coating | Anti-corrosion marine-grade coating available |
| Service Life | Designed for long-term continuous operation |
Below is our range of product models for your reference. If you are unsure which one to choose, please contact our team; we will be happy to assist you within 24 hours.
Why Choose Changyu?
Sea Water Pump Manufacturer
Changyu is a leading centrifugal seawater pump manufacturer and supplier with 20 years of expertise in pump design, production, and R&D. We offer a wide range of industrial centrifugal pumps tailored to diverse operating conditions, including seawater pumps, acid pumps, alkali pumps, and magnetic drive pumps. We have over 25 patented technologies and rich OEM/ODM experience, providing reliability, efficiency, and long service life. Certified to ISO 9001, CE, and ATEX standards, our products meet stringent quality and safety requirements for global markets. Whether you need a standard model or a fully customized design, our professional team is ready to provide the optimal solution. Contact us today to discuss your project requirements and receive a tailored proposal.
Quick Selection Guide: Centrifugal vs Magnetic Seawater Pump
| Selection Criteria | Centrifugal Seawater Pump | Magnetic Drive Pump |
|---|---|---|
| Flow Capacity | High flow (0.8 – 750 m³/h) | Low to medium flow |
| Operating Pressure | Medium to high pressure | Low to medium pressure |
| Sealing Structure | Mechanical seal system | Seal-less magnetic coupling |
| Leakage Risk | Very low (with proper seal system) | Zero leakage design |
| Maintenance Requirement | Periodic seal & bearing maintenance | Low mechanical maintenance, but strict operating conditions |
| Cost Level | Lower initial and lifecycle cost | Higher initial investment |
| Best Application | Desalination, seawater cooling, offshore systems, port facilities | Chemical transfer, small flow corrosive liquids |
| Continuous Operation | Suitable for long-term continuous duty | Limited under heavy-duty conditions |
| Installation Flexibility | High (horizontal & system integration friendly) | Moderate |
Recommendation
For seawater applications requiring large flow, continuous operation, and cost efficiency, centrifugal seawater pumps are the preferred choice.
Magnetic drive pumps are recommended only for small flow, high sealing safety chemical transfer systems.
If you are unsure about further configuration options, please contact our team and we will provide you with personalised, professional guidance on selecting the right solution.
Email: [email protected]
Phone: +86-13651913727
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