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.
La 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 .
Haute résistance mécanique
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.
| Paramètres | Range / Specification |
|---|---|
| Model Series | Durafort LC |
| Flow Capacity (Q) | 50 - 8 400 m³/h |
| Head (H) | 15 – 400 m |
| Vitesse | 980 / 1,480 / 2,970 r/min (50 Hz & 60 Hz) |
| Operating Temperature | Jusqu'à 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
- Marine et construction navale – 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
- Titane : 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
Pourquoi choisir les pompes 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.
Courriel : sales@durafortpump.com
Product Line: LC Vertical Turbine Pump | XSP Split Case Pump | HD Vertical Mixed Flow Pump | ZLB Vertical Axial Flow Pump
