Dongguan HydroBlue Co., Ltd.
| Pump Package | Carton and Wooden Cases |
| Origin | China |
| Material 2 | Stainless Steel, Duplex Ss, Cast Alloy Steel |
| Specification | According to the drawings |
| HS Code | 84139100 |
| Material 1 | Cast Iron, Wear-Resistant Cast Iron, Cast Steel |
| Trademark | VINSOME |
| Certificate | ISO9001:2015, ISO14001:2004, API Specification Q1 |
| Transport Package | Carton and Wooden Cases |
| Material Standard | ASTM, ANSI, SAE, Uns, DIN, En, ISO, Toct |
| Mould | Investment Casting Mould, Sand Casting Mould |
| Production Capacity | 10, 000 Tons Per Year |
| Types of Welding Parts | OEM/ODM |
| Pump Model. | Mc/MD/G Sg/CD8/Bbtd/Msd/Mca/Mce/Mcv |
| Testing | Dynamic Balancing |
| Model NO. | spare parts |
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Product Specification
| Pump Package | Carton and Wooden Cases | Origin | China |
| Material 2 | Stainless Steel, Duplex Ss, Cast Alloy Steel | Specification | According to the drawings |
| HS Code | 84139100 | Material 1 | Cast Iron, Wear-Resistant Cast Iron, Cast Steel |
| Trademark | VINSOME | Certificate | ISO9001:2015, ISO14001:2004, API Specification Q1 |
| Transport Package | Carton and Wooden Cases | Material Standard | ASTM, ANSI, SAE, Uns, DIN, En, ISO, Toct |
| Mould | Investment Casting Mould, Sand Casting Mould | Production Capacity | 10, 000 Tons Per Year |
| Types of Welding Parts | OEM/ODM | Pump Model. | Mc/MD/G Sg/CD8/Bbtd/Msd/Mca/Mce/Mcv |
| Testing | Dynamic Balancing | Model NO. | spare parts |
| High Light | Sulzer centrifugal pump impeller ，aluminum alloy pump impeller ，close impeller Sulzer parts | ||
Dongguan HydroBlue Co., Ltd. supplies replacement open impellers for SULZER centrifugal pumps, covering slurry, wastewater, and process pump applications. Our eight-person engineering team works across fluid dynamics, casting metallurgy, and precision metrology, with research collaborations at Jiangsu University, Chinese Academy of Sciences, and Guangdong University of Technology. We also provide complete pump spares, mechanical seal assemblies, motor control enclosures, variable-frequency drive cabinets, and overseas field engineering support including 3D scanning of worn components.
Contact us with your SULZER pump model and impeller details for a material recommendation and quotation.
Unlike closed impellers where the flow channel is enclosed between front and back shrouds, an open impeller has vanes attached to a hub with no front shroud. The vane tips run in close proximity to the pump casing or side plate, creating a running clearance typically 0.3–0.8 mm. This open-face design allows larger solids and stringy materials to pass through without clogging, making it the preferred choice for slurry, wastewater, and pulp handling.
A key advantage of the open impeller is that axial adjustment (by shimming the bearing housing or adjusting the back cover) can restore the original tip clearance as wear occurs, extending the impeller's service life without replacement.
|
Feature |
Open Impeller |
Closed Impeller |
|---|---|---|
|
Solids handling |
Excellent — large passages, no shroud to clog |
Limited — enclosed passage prone to blockage |
|
Efficiency |
Moderate (80–90% of closed) |
High — minimal tip leakage |
|
Wear recovery |
Yes — axial adjustment restores clearance |
No — wear requires replacement |
|
Typical service |
Slurry, wastewater, pulp, food |
Clean water, chemical, high-pressure |
The gap between the vane tips and the casing wall is the most critical dimensional parameter for open impeller performance. As this clearance increases from wear, internal recirculation (slip flow) grows and pump efficiency decreases. The table below shows typical effects:
|
Tip Clearance (per side) |
Efficiency Loss vs. New |
Action Required |
|---|---|---|
|
0.3–0.8 mm (design) |
None |
Normal operation |
|
0.8–1.5 mm |
3–5% |
Monitor; plan for adjustment at next shutdown |
|
1.5–3.0 mm |
8–15% |
Adjust impeller axially to restore clearance |
|
> 3.0 mm |
> 15% |
Replace impeller; adjustment alone insufficient |
|
Material |
Wear Resistance |
Corrosion Resistance |
Best For |
|---|---|---|---|
|
HT250 cast iron |
Standard |
Low |
General slurry, wastewater |
|
Ni-Hard / Hi-chrome |
Excellent (550+ HB) |
Moderate |
Abrasive sand, mining slurry |
|
SS316 / CD4MCu |
Moderate |
Good |
Corrosive process fluids, pulp |
|
Duplex 2205 |
Good |
Excellent |
Seawater, brine, chlorides |
Q1: Can I restore performance of a worn open impeller without replacing it?
Yes, if the vane profile is still intact and only the tip clearance has increased. Axial adjustment (shimming the bearing housing or adjusting the back cover) restores the original clearance. If vane edges are heavily eroded or the impeller diameter has worn by more than 5%, replacement is needed.
Q2: What material is best for abrasive mining slurry?
Ni-Hard or high-chrome iron (550+ HB) offers the best wear resistance. For extreme abrasion combined with corrosion, consider CD4MCu (25% Cr duplex stainless) which balances hardness with corrosion resistance.
Q3: What is the typical clearance adjustment range for an open impeller?
Most SULZER open impellers allow 1–3 mm of axial adjustment through shimming. Beyond 3 mm of accumulated clearance, the impeller should be replaced as vane wear at the pressure side becomes significant.
Q4: Do you supply Stellite-tipped open impellers?
Yes. Stellite 6 or 12 hardfacing can be applied to the vane tips by TIG or plasma transfer arc welding. This is recommended for impellers handling fine abrasive slurries in high-wear applications.
Q5: What warranty applies?
12 months from commissioning or 18 months from shipment. Covers material defects, dimensional non-conformance, and casting quality. Wear from abrasive service is application-dependent.
Company Details
Business Type:
Manufacturer,Trading Company
Year Established:
2006
Total Annual:
$10 Million-US$50 Million
Employee Number:
50~100
Ecer Certification：
Verified Supplier
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