When handling seawater – whether for desalination, offshore cooling, or marine fire protection – material selection is critical. Seawater is highly aggressive, combining chloride-induced pitting, crevice corrosion, and stress corrosion cracking (SCC).
For reliable, long-life pumping, EN 1.4462 (Duplex SS2205) and EN 1.4410 (Super Duplex SS2507) horizontal split case pumps offer the ideal balance of strength, weldability, and outstanding corrosion resistance.
In this post, we focus on Hunan Durafort Pump Co., Ltd. – a professional Chinese pump manufacturer – and its XSP series horizontal split case pump engineered with duplex and super duplex stainless steels for demanding seawater treatment applications.
Why Choose EN 1.4462 / 1.4410 Duplex Stainless Steel for Seawater?
| Material | Standard | UNS | Key Property for Seawater |
|---|---|---|---|
| EN 1.4462 | Duplex SS2205 | S32205 / S31803 | High resistance to chloride pitting (PREN ≥ 35) |
| EN 1.4410 | Super Duplex SS2507 | S32750 | Excellent resistance to crevice corrosion & SCC (PREN ≥ 42) |
Both materials offer:
- ✅ Higher strength than austenitic grades (316L, 904L) – thinner walls, lighter pump.
- ✅ Lower thermal expansion – better dimensional stability under temperature fluctuations.
- ✅ Excellent fatigue resistance – ideal for high-cycle seawater pumping.
For seawater treatment (reverse osmosis feed, brine handling, cooling intake, ballast water treatment), EN 1.4410 super duplex is often preferred for higher chloride levels and elevated temperatures.
Hunan Durafort XSP Series: Duplex SS Horizontal Split Case Pump Overview
The XSP split case pump from Hunan Durafort is a single-stage, double-suction, horizontally split design – allowing easy maintenance without disturbing pipework. When supplied in EN 1.4462 or EN 1.4410, it becomes a top-tier solution for aggressive seawater services.
Key Specifications (XSP model with duplex materials)
| Parameter | Value |
|---|---|
| Flow | 135 ~ 38,000 m³/h |
| Head | 12 ~ 205 m |
| Speed | 2370 ~ 2970 rpm |
| Max. Temperature | 150°C |
| Efficiency | up to 87% |
| Materials available | Carbon steel, ductile iron, SS304, SS316L, EN 1.4462 (2205), EN 1.4410 (2507), 904L, CD4MCu, Titanium |
The double-suction design minimizes axial thrust, reduces NPSH required, and delivers smooth operation – critical for continuous seawater service.
Seawater Treatment Applications Using EN 1.4462 / 1.4410 Split Case Pumps
Horizontal split case pumps with duplex stainless steel are widely used in:
- Seawater Reverse Osmosis (SWRO) Desalination
- High-pressure feed pumps (with appropriate rating) or low-pressure circulation/backwash pumps.
- Coastal Power Plants (Nuclear / Thermal / Combined-Cycle)
- Cooling water intake, condenser circulation, and auxiliary seawater cooling.
- Offshore Platforms & FPSO
- Seawater lift, firewater jockey pumps, ballast transfer.
- Marine & Shipbuilding
- Engine cooling with raw seawater, bilge/bulkhead transfer, and anti-heeling systems.
- Seawater Treatment for Ports / Harbors
- Dock fire protection, flushing systems, and dewatering.
Advantages of Hunan Durafort’s Duplex SS Horizontal Split Case Pumps
- 🔧 Easy maintenance – Horizontally split casing allows top-half removal without disconnecting piping.
- 🛡️ Corrosion warranty – EN 1.4410 super duplex ensures >25 years of seawater service with minimal chloride attack.
- ⚙️ High efficiency – Up to 87% hydraulic efficiency reduces energy cost in high-flow seawater plants.
- 🌊 Wide flow range – From 135 m³/h (small intake) to 38,000 m³/h (large cooling water).
- 🔥 Temperature resistant – Up to 150°C, suitable for warm seawater or thermal outfalls.
Comparison: EN 1.4462 vs. EN 1.4410 for Seawater Treatment
| Feature | EN 1.4462 (Duplex 2205) | EN 1.4410 (Super Duplex 2507) |
|---|---|---|
| Pitting Resistance Equivalent (PREN) | 35–38 | ≥ 42 |
| Yield strength (MPa) | ≥ 450 | ≥ 550 |
| Recommended for seawater temperature | < 60°C | < 120°C |
| Typical seawater application | General seawater, brackish water | High-chloride, warm seawater, brine |
Tip: For warm seawater (e.g., Middle East desalination or tropical power plants), prefer EN 1.4410 super duplex.
Other Pumps from Hunan Durafort for Seawater / Corrosive Fluids
While the XSP split case pump is ideal for high-flow seawater transfer, Hunan Durafort also offers:
- LC vertical turbine pump – Deep well seawater intake.
- HD vertical mixed flow pump – Large volume seawater lift (low head, high flow).
- ZLB vertical axial flow pump – Flood control or circulation.
All can be manufactured in super duplex (EN 1.4410), duplex (EN 1.4462), titanium, or CD4MCu upon request.
Contact Hunan Durafort Pumps – Professional Manufacturer
If you need horizontal split case pumps in EN 1.4462 or EN 1.4410 for your seawater treatment project, Hunan Durafort Pump Co., Ltd. provides:
- Custom hydraulic design for exact duty point.
- Fast lead times – made in China with global shipping.
👉 Request your quotation today – mention “EN 1.4410 seawater split case pump” for priority technical support.
