Built for the World’s Most Aggressive Marine Environments
Seawater intake is one of the most demanding pumping applications in heavy industry. Standard pump materials—cast iron, bronze, or 304/316L stainless steel—simply cannot withstand the relentless attack of chloride-rich seawater. Pitting, crevice corrosion, and erosion-corrosion from suspended marine sands rapidly degrade conventional pumps, leading to costly downtime and frequent replacements.
The solution? ASTM A890 Grade 5A Super Duplex Stainless Steel.
Hunan Durafort Pumps manufactures the LC Series Vertical Turbine Pump in ASTM A890 5A (UNS J93404 / CE3MN), specifically engineered for high-capacity seawater extraction in SWRO desalination plants, offshore platforms, coastal power stations, and marine installations worldwide .
Why ASTM A890 5A (Super Duplex) is the Gold Standard for Seawater Pumps
ASTM A890 Grade 5A—also known as CE3MN, UNS J93404, or cast equivalent to 2507 super duplex—features a balanced microstructure of approximately 50% ferrite and 50% austenite . This dual-phase metallurgy delivers unmatched corrosion resistance and mechanical strength for seawater duty.
Key Material Advantages
Superior Pitting & Crevice Corrosion Resistance (PREN ≥ 42)
With high Chromium (24.0–26.0%), Molybdenum (4.0–5.0%), and Nitrogen (0.10–0.30%), ASTM A890 5A achieves a Pitting Resistance Equivalent Number above 42 . This ensures virtual immunity to chloride attack in warm, high-salinity seawater (>35,000 ppm TDS) .
Exceptional Stress Corrosion Cracking (SCC) Resistance
The duplex microstructure provides outstanding resistance to chloride-induced stress corrosion cracking—a common failure mode for standard austenitic stainless steels in marine environments .
Kekuatan Mekanis yang Tinggi
ASTM A890 5A offers yield strength of 485–515 MPa minimum—nearly double that of 316L or 904L stainless steel . This allows for thinner casing walls, higher pressure ratings, and reduced pump weight without compromising integrity.
Erosion-Corrosion Resistance
Coastal intakes often carry abrasive suspended solids and sand. Super Duplex 5A resists surface degradation, significantly extending the service life of impellers and bowl diffusers .
Durafort LC Series – Technical Specifications
The Durafort LC Vertical Turbine Pump is engineered for deep sumps, open-sea intakes, and intake canal configurations.
| Parameter | Range / Specification |
|---|---|
| Model Series | Durafort LC |
| Flow Capacity (Q) | 50 - 8.400 m³/jam |
| Head (H) | 15 – 400 m |
| Kecepatan | 980 / 1,480 / 2,970 r/min (50 Hz & 60 Hz) |
| Operating Temperature | Hingga 180°C |
| Wetted Materials | ASTM A890 Grade 5A (Super Duplex UNS J93404 / CE3MN) |
| Optional Alloys | Duplex 2205, 316L, 904L, CD4MCu, Alloy 20, Alloy 31, Hastelloy, Monel, Titanium TA2/TA10 |
| Drive Configurations | Vertical electric motor, right-angle gear reducer (diesel engine drive) |
Structural Features – Engineered for Reliability
Optimised Hydraulic Bowl Assembly
CAD-designed multi-stage bowls with smooth flow passages achieve hydraulic efficiencies up to 88%+ while minimising internal turbulence and cavitation risk (low NPSHr).
Robust Column Pipe & Shaft Line
Available in open-line or enclosed-line shaft designs. Shafts are precision-machined from high-tensile Super Duplex or Monel alloys to resist cyclic fatigue, torsional shock, and marine biofouling.
Advanced Bearing Protection
Fitted with Thordon, Silicon Carbide (SiC), or water-lubricated rubber guide bearings—engineered to handle abrasive marine particulates without seizing or galling.
Customisable Discharge Heads
Fabricated or cast heads available in surface or below-ground configurations, tailored to your station piping layout.
Primary Applications
- SWRO Desalination Plants – Seawater intake feed pumps and brine recirculation systems
- Coastal Thermal & Nuclear Power – Main cooling water (CCW) and auxiliary seawater service pumps
- Offshore Oil & Gas – Seawater lift, firewater, and water injection pumps
- Kelautan & Pembuatan Kapal – Ballast water transfer and dry-docking pumps
- Chemical & Petrochemical – Circulating pumps for aggressive halide solutions, acid-laden wastewater, and industrial brines
Complete Metallurgical Capability
Hunan Durafort Pumps offers a comprehensive range of materials for vertical turbine pumps:
- Standard Grades: Carbon Steel, Ductile Iron, SS304, SS316L
- Duplex Grades: Duplex SS2205, Super Duplex SS2507 (ASTM A890 5A)
- High-Alloy Grades: 904L, CD4MCu, Alloy 20, Alloy 31, Hastelloy, Inconel, Monel alloys
- Titanium: TA2, TA10
Quality Assurance You Can Trust
- 100% Non-Destructive Testing (NDT)
- Chemical composition verification
- Dye penetrant inspection
- Dynamic balancing
- Full-scale hydrostatic testing per API 610 and ISO 9906 standards
Mengapa Memilih Pompa Hunan Durafort?
- Specialist Manufacturer – Professional pump manufacturer with decades of experience in heavy-duty centrifugal and vertical pump systems
- Complete Product Range – LC Vertical Turbine Pump, XSP Split Case Pump, HD Vertical Mixed Flow Pump, ZLB Vertical Axial Flow Pump
- Tailored Engineering – Custom column lengths, discharge head geometry, motor brand selection (ABB, Siemens, WEG)
- Global Service – Factory-direct pricing and technical support worldwide
Get a Quote for Your Seawater Intake Project
Looking for a high-efficiency ASTM A890 5A vertical turbine pump for seawater intake? Contact the engineering team at Hunan Durafort Pumps today for technical datasheets, CAD drawings, and factory-direct pricing.
Email: sales@durafortpump.com
Product Line: LC Vertical Turbine Pump | XSP Split Case Pump | HD Vertical Mixed Flow Pump | ZLB Vertical Axial Flow Pump
