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.
تقدم شركة «هونان دورافورت للمضخات» المحدودة، وهي إحدى الشركات الرائدة في تصنيع المضخات في مقاطعة هونان وجنوب الصين، XSP series split case pump صُممت باستخدام 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)
| العنصر | % |
|---|---|
| الكروم (Cr) | 21.0–23.0 |
| النيكل (Ni) | 4.5–6.5 |
| الموليبدينوم (Mo) | 2.5–3.5 |
| النيتروجين (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
شركة هونان دورافورت للمضخات مضخة أفقية ذات هيكل منفصل من سلسلة XSP متوفر في 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)
| المعلمة | النطاق |
|---|---|
| معدل التدفق | 135 - 38,000 متر مكعب/ساعة |
| الرأس | 12 - 205 m |
| السرعة | 1,450 – 2,970 دورة في الدقيقة (قابلة للتعديل) |
| درجة الحرارة | حتى 150 درجة مئوية |
| المواد (الأجزاء الملامسة للسائل) | 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
إن 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.
- الشؤون البحرية وبناء السفن – 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 وحدة ضخ 20,000, 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.
- التلدين بالحل – 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
| المواد | مقاومة الخرسانة المخلوطة بالكلوريد للتشقق التموجي (SCC) | Pitting Resistance (PREN) | حد الخضوع (ميغاباسكال) | Cost Factor |
|---|---|---|---|---|
| الحديد الزهر | None | <20 | ~200 | منخفض |
| SS304 | Poor (susceptible) | 18 | 205 | Medium |
| SS316L | معتدل | 25 | 170 | Medium+ |
| دوبلكس 2205 | ممتاز | ≥35 | ≥450 | High (but cost-effective long-term) |
| سوبر دوبلكس 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.
لماذا تختار مضخات هونان دورافورت؟
- 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.
- حاصلة على شهادة ISO 9001 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.
مضخة هونان شيانغمي manufactures a comprehensive range of heavy-duty pumps:
- مضخة ذات هيكل منفصل (سلسلة XSP)
- مضخة التوربينات العمودية (LC series)
- Vertical axial/mixed flow pump (ZLB serise)
Contact us directly:
sales@deyangforge.com
