Seawater treatment plants face one of the harshest pumping environments: high chloride levels, abrasive particles, tidal fluctuations, and the constant threat of stress corrosion cracking (SCC). Standard materials like cast iron or SS304 simply cannot survive long‑term in these conditions.
The solution? Duplex Stainless Steel 2205 vertical turbine pumps – engineered for unmatched resistance to pitting, crevice corrosion, and SCC in saline and brackish water.
شركة هونان شيانغمي للمضخات المحدودة., a professional pump manufacturer in China, offers the LC series vertical turbine pump in Duplex SS2205, Super Duplex SS2507, and other high‑grade alloys. These pumps are the preferred choice for seawater intake, brine transfer, desalination, and coastal fire protection systems.
Why Duplex Stainless Steel 2205 for Seawater Treatment?
Seawater treatment involves several corrosive stages: raw seawater lift, filtration backwash, reverse osmosis feed, and brine discharge. دوبلكس SS2205 ينص على ما يلي:
| العقارات | Benefit for Seawater Treatment |
|---|---|
| High yield strength (≈450–550 MPa) | Reduced wall thickness, lighter pump columns |
| PREN ≥ 35 | Excellent resistance to pitting & crevice corrosion |
| Dual phase (austenite + ferrite) | Superior chloride SCC resistance compared to 316L |
| Good erosion resistance | Withstands sand, marine organisms & debris |
Compared to austenitic grades, 2205 offers nearly twice the strength, allowing deeper set bowls and higher pressure capability – critical for vertical turbine pumps installed in offshore intake structures or on‑plant sumps.
Durafort LC Vertical Turbine Pump – Technical Highlights for Seawater Duty
شركة هونان دورافورت LC series is specifically designed for high‑flow, medium‑head applications where reliability and corrosion resistance are paramount.
Key technical data (Duplex SS2205 execution):
| المعلمة | Range / Value |
|---|---|
| معدل التدفق | 50 - 8,400 متر مكعب/ساعة |
| الرأس | 15 - 150 m |
| السرعة | 980, 1480, 2970 r/min |
| Max temperature | ~150°C |
| Materials (hydraulic parts) | Duplex SS2205, Super Duplex SS2507, CD4MCu, 904L, Titanium, SS316L, Cast/Ductile Iron |
| Shaft material | Duplex SS2205 or higher (for seawater) |
| Bowl & column pipe | Duplex SS2205, epoxy‑coated carbon steel, or rubber‑lined |
✅ Available with ABMA / ISO bearings, mechanical seals or packing, and customized bowl assemblies for varying submersion depths.
The LC pump can be supplied as a single‑stage or multistage vertical turbine, with open or enclosed impellers, depending on the solids content of the seawater intake.
Key Applications in Seawater Treatment Plants
1. Seawater Intake Pumps
Raw seawater contains chlorides (≈19,000–28,000 ppm), suspended solids, and microorganisms. Duplex SS2205 vertical turbine pumps are installed in coastal intake towers or beach wells to lift seawater to the treatment facility.
- Durafort advantage: Long column lengths (up to 30+ meters), with Duplex shafts and bowl assemblies that resist galvanic corrosion.
2. Desalination Plant Feed & Brine Rejection
Both thermal (MSF, MED) and membrane (RO) desalination require high‑volume, medium‑pressure pumps. After pre‑treatment, Duplex 2205 pumps safely handle chlorinated seawater without risk of chloride‑induced failure.
- Brine discharge: Highly concentrated salt solution (≈60,000–70,000 ppm TDS) – Super Duplex SS2507 may be used for extreme cases, but 2205 is often sufficient for properly designed systems.
3. Cooling Water for Coastal Power & Industrial Plants
Integrated seawater treatment plants often supply cooling water to nearby industries. The مضخة توربينية عمودية من طراز LC in Duplex SS2205 circulates seawater through heat exchangers and returns it to the sea.
4. Fire Protection Systems (Seawater Source)
Many coastal treatment plants use seawater as firefighting water. Duplex SS2205 vertical turbine pumps provide reliable jockey and main fire pump duty, meeting NFPA 20 requirements for corrosion‑resistant materials.
5. Ballast Water Treatment & Port Facilities
Onshore seawater treatment plants serving harbors use 2205 vertical turbine pumps to move water through ballast water treatment systems – a growing application due to IMO regulations.
Comparison: Duplex SS2205 vs. Other Materials for Seawater Service
| المواد | Pitting Resistance (PREN) | Typical Service Life in Seawater | Cost Level |
|---|---|---|---|
| Cast iron + coating | < 25 | 1–2 years (coating failure) | منخفض |
| SS304 | ~18 | Not recommended (rapid pitting) | Low‑medium |
| SS316L | ~24–26 | Moderate (crevice corrosion risk) | Medium |
| دوبلكس SS2205 | ≥ 35 | 15–20+ years | Medium‑high |
| الفولاذ المقاوم للصدأ سوبر دوبلكس SS2507 | ≥ 40 | 20–25+ years (extreme conditions) | High |
| Titanium (Grade 2) | > 60 | Indefinite | Very high |
Durafort’s position: For most seawater treatment plants, دوبلكس SS2205 offers the best balance of cost, fabricability, and long‑term corrosion resistance. Where sand erosion or very high chlorides are present, we recommend الفولاذ المقاوم للصدأ سوبر دوبلكس SS2507 أو CD4MCu (a duplex stainless steel with copper for added erosion resistance).
Why Choose Hunan Durafort Pumps for Seawater Vertical Turbine Pumps?
- مرونة تامة في اختيار المواد: Not only Duplex SS2205, but also SS304, SS316L, 904L, CD4MCu, Titanium, and Super Duplex 2507.
- Extensive product range: XSP split case, HD mixed flow, ZLB axial flow – all can be manufactured in duplex grades.
- Manufacturing capability: ISO 9001 certified, with hydraulic design optimized for low NPSH requirements in seawater applications.
- Global project experience: Supplied to desalination plants in the Middle East, Southeast Asia, and coastal China.
- After‑sales support: Spare parts, on‑site commissioning, and performance testing.
FAQ – Duplex SS2205 Vertical Turbine Pumps for Seawater Treatment
Q1: Can I use standard SS316L vertical turbine pump in a seawater treatment plant?
A: Short‑term (2–3 years) – maybe. Long‑term – not recommended. SS316L suffers crevice corrosion under biofouling and in flange gasket areas. Duplex SS2205 is the minimum recommended grade for continuous seawater duty.
Q2: What flow range is available in Durafort’s LC pump with Duplex 2205?
A: From 50 m³/h up to 8,400 m³/h. For larger flows, multiple pumps in parallel are common in seawater intake stations.
Q3: How does Super Duplex SS2507 compare to 2205?
A: 2507 offers higher strength and PREN >40 – ideal for very warm seawater (e.g., Persian Gulf) or high‑velocity zones. Durafort can supply either grade based on your water chemistry.
Q4: Does Durafort provide coating for carbon steel columns in seawater service?
A: Yes. For cost‑sensitive projects, we offer epoxy‑coated or rubber‑lined carbon steel column pipes with Duplex SS2205 bowls and shafts. This hybrid construction reduces cost while maintaining corrosion resistance in wetted parts.
Q5: Do you offer pumps for submerged depths >20 meters?
A: Absolutely. The LC vertical turbine pump is designed for deep well and intake tower applications. We calculate critical speed and shaft bearing spacing to ensure vibration‑free operation.
Need a solution?
If you are planning a new seawater treatment plant, upgrading an existing intake system, or need replacement pumps that will last 15+ years without chloride cracking, contact مضخة هونان شيانغمي today.
📧 Email: sales@deyangforge.com
🌐 Website: https:deyangforge.com
📞 Request a quote with your flow, head, submersion depth, and seawater chloride level – we will recommend the optimal material (Duplex SS2205, 2507, or Titanium) and provide a detailed technical proposal.
