When moving aggressive fluids like sea water, brackish water, or chemical-laden industrial liquids, standard cast iron or 304 stainless steel pumps fail quickly due to pitting, crevice corrosion, or stress corrosion cracking (SCC). The solution? A duplex stainless steel 2205 split case pump for sea water applications.
Hunan Durafort Pumps Co., Ltd., a leading pump manufacturer in Hunan Province and South China, offers the XSP series split case pump engineered with duplex 2205 (UNS S32205, ASTM A890 Gr. 5A) – a material specifically chosen for its outstanding resistance to chloride attack and high mechanical strength.
Why Duplex Stainless Steel 2205 for Sea Water Pumps?
Sea water is one of the most corrosive natural environments due to its high chloride content (typically 18,000–30,000 ppm). Austenitic stainless steels like 304 or 316L can suffer from pitting and crevice corrosion, while duplex 2205 provides:
- Superior chloride stress corrosion cracking (SCC) resistance – critical in warm sea water and tidal zones.
- High pitting resistance equivalent number (PREN ≥35) – far exceeding 316L (PREN ~25).
- Double the yield strength (≥450 MPa vs. ~170–220 MPa for 316L) – allows thinner, lighter pump casings without sacrificing durability.
- Excellent erosion-corrosion resistance – perfect for pumps handling sand-laden sea water.
Chemical Composition of Duplex 2205 (ASTM A890 Gr. 5A)
| Element | % |
|---|---|
| Chromium (Cr) | 21.0–23.0 |
| Nickel (Ni) | 4.5–6.5 |
| Molybdenum (Mo) | 2.5–3.5 |
| Nitrogen (N) | 0.08–0.20 |
| Iron (Fe) | Balance |
The balanced austenite‑ferrite microstructure (≈50% each) gives duplex 2205 its unique combination of corrosion resistance and mechanical strength.
XSP Series Split Case Pump – Designed for Demanding Sea Water Duties
Hunan Durafort Pumps’s ปั๊มแบบตัวเครื่องแยกส่วนแนวนอน ซีรีส์ XSP มีให้เลือกใน duplex stainless steel 2205 for the wetted end (casing, impeller, wear rings, shaft sleeve). The split case design allows easy maintenance without disturbing piping – essential for offshore and marine installations.
Technical Specifications (Duplex 2205/2507 Version)
| พารามิเตอร์ | ช่วง |
|---|---|
| อัตราการไหล | 135 – 38,000 m³/h |
| หัวหน้า | 12 – 205 เมตร |
| ความเร็ว | 1,450 – 2,970 rpm (customizable) |
| อุณหภูมิ | สูงสุด 150°C |
| Materials (wetted parts) | Duplex 2205, Super Duplex 2507, 904L, CD4MCu, 316L, Carbon Steel, Cast Iron |
*Other materials available: Cast Iron / HT250, Ductile Iron, SS304, SS316L, CD4MCu, 904L, SS2507.*
Key Applications of Duplex 2205 Split Case Pumps for Sea Water
The duplex stainless steel 2205 split case pump for sea water is engineered for:
- Seawater intake & cooling – Coastal power plants (thermal & nuclear), LNG terminals, desalination plants.
- Marine & shipbuilding – Ballast water pumping, fire water systems, engine cooling, bilge and service water.
- Offshore platforms – Seawater lift pumps, injection pumps, deck wash systems.
- Desalination (reverse osmosis / MED) – Pre-treatment and brine transfer.
- Industrial – Pulp & paper (chlorine dioxide environment), chemical processing, steel mills (direct cooling with sea water).
Duplex 2205 Casting & Manufacturing Quality at Hunan Durafort Pumps
With over 300 employees and an annual production of 20,000 pump units, Hunan Durafort Pumps employs stringent casting and heat treatment processes for duplex stainless steel components:
- Casting process – Investment or precision sand casting to achieve UNS S32205/ASTM A890 Gr. 5A specification.
- Solution annealing – 1020–1100°C followed by water quenching to restore corrosion resistance after welding or hot forming.
- Welding procedure – ER2209 filler metal with heat input controlled to 0.5–2.5 kJ/mm, ensuring proper phase balance.
Every pump is hydrostatically tested and performance-tested to ISO 9906 standards before shipment.
Advantages Over Competing Materials in Sea Water Service
| วัสดุ | ความต้านทานต่อ SCC ของคลอไรด์ | ความต้านทานการเกิดหลุม (PREN) | Yield Strength (MPa) | Cost Factor |
|---|---|---|---|---|
| เหล็กหล่อ | None | <20 | ~200 | ต่ำ |
| SS304 | Poor (susceptible) | 18 | 205 | ระดับกลาง |
| SS316L | Moderate | 25 | 170 | Medium+ |
| Duplex 2205 | ยอดเยี่ยม | ≥35 | ≥450 | High (but cost-effective long-term) |
| Super Duplex 2507 | Superior | ≥40 | ≥550 | Very High |
For sea water, duplex 2205 offers the best balance of performance and price – lower initial cost than titanium or Super Duplex, yet far superior life cycle cost compared to 316L or bronze.
ทำไมจึงควรเลือกปั๊ม Hunan Durafort?
- Specialist in large split case & vertical pumps – 20+ years experience, 20,000 units/year capacity.
- Complete material flexibility – From cast iron to super duplex, 904L, CD4MCu.
- Global export ready – Pumps shipped to Middle East, Southeast Asia, Africa, and South America for sea water projects.
- ISO 9001 certified with full traceability and material certificates (EN 10204 3.1/3.2).
Order Your Duplex Stainless Steel 2205 Split Case Pump for Sea Water Today
Whether you need a high-flow pump for a desalination plant, a rugged unit for an offshore platform, or a reliable split case pump for shipboard service, Hunan Durafort Pumps delivers custom-engineered duplex 2205 split case pumps with short lead times.
Hunan Durafort Pumps manufactures a comprehensive range of heavy-duty pumps:
- Split case pump (XSP series)
- Vertical turbine pump (LC series)
- Vertical axial/mixed flow pump (ZLB serise)
Contact us directly:
sales@deyangforge.com
