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Stainless steel Double Suction Pump Impeller
double suction pump impellers through ceramic shell lost foam process in stainless steel and duplex alloys
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Stainless steel Double Suction Pump Impeller
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Zibo Geluobao produces double suction pump impellers through ceramic shell lost foam process in stainless steel and duplex alloys — delivering corrosion resistance, precision blade geometry, and surface finish quality that sand casting cannot match.
Design Characteristics of Double Suction Impellers
Critical Design Features
- Symmetrical dual-volute inlet — Two mirror-image blade sets sharing a common back shroud; fluid enters both eyes axially and exits radially
- Enclosed (shrouded) design — Front and back shrouds fully enclose the vanes for maximum hydraulic efficiency
Why Investment Casting?
- Blade profile accuracy ±0.15–0.30 mm — Ceramic shell captures complex curved vane geometry that sand molds distort
- Ra 3.2–6.3 μm as-cast blade surfaces — Reduces hydraulic skin friction; no need for expensive blade polishing
- No sand inclusions at blade roots — The #1 failure point in sand-cast impellers (stress concentration + corrosion initiation) is eliminated
- Piece-to-piece consistency — Every impeller in a batch matches within ±0.05 mm; dynamic balancing is predictable and fast
- Material flexibility — Same tooling produces CF8M, Duplex 2205, Super Duplex 2507 — just change melt composition
Available Materials
Grade Standard Best Application Key Property CF8M / 316SS
ASTM A351 J92900 Municipal water, irrigation, cooling tower circulation, general freshwater service Molybdenum-enhanced chloride resistance up to ~200 ppm Cl⁻ CF3M / 316L
ASTM A351 J92800 Chemical process pumps handling dilute acids/alkalis; welded assemblies Low carbon (<0.03%) prevents sensitization during welding Duplex 2205 (S32205)
ASTM A995 Brackish water, seawater intake, cooling towers with chlorides >500 ppm PREN 34–36; SCC resistant; 2× yield strength of 316 Super Duplex 2507 (S32750)
ASTM A995 Offshore platforms, desalination plants, aggressive seawater with H₂S traces PREN ≥40; extreme pitting/crevice corrosion resistance CD4MCuN
ASTM A995 J93372 Sulfuric/phosphoric acid transfer pumps, fertilizer industry Copper-alloyed duplex for reducing acid environments 17-4PH (S17400)
ASTM A747 High-head pumps requiring HRC 35–40 hub strength + corrosion resistance Precipitation hardenable to 1380 MPa UTS Investment Casting vs Sand Casting — Direct Comparison
Attribute Investment Casting (Ours) Sand Casting (Traditional) Vane Profile Tolerance ±0.15–0.30 mm — ceramic shell holds shape precisely
±0.8–2.0 mm — sand shift during pour causes distortion
Blade Surface Roughness Ra 3.2–6.3 μm as-cast (usable without machining) Ra 25–100 μm (requires grinding/polishing) Batch Consistency Variance <0.05 mm between pieces Variance 0.3–1.0 mm; each piece needs individual trim/balance adjustment Sand Inclusion / Porosity Zero (ceramic shell process)
Common defect, especially at thin vane root fillets — major fatigue/corrosion initiation site
First Article Lead Time 2–3 weeks from drawing approval 6–10 weeks (pattern plate + core boxes + trial runs) Tooling Cost (New Design) $200–$500 (wax injection die) $3,000–$10,000 (aluminum pattern + core boxes) Min Order Quantity 1 piece accepted Economical MOQ 5–10 pieces Quality Assurance Protocol
Chemical Composition OES spectrometer every heat — Cr/Ni/Mo/N verified against ASTM limits; ferrite measurement for all duplex grades (target 35–65%) Mechanical Properties Tensile test coupon from same heat — YS, UTS, elongation, hardness documented per EN 10204 3.1 Dimensional Verification CMM full inspection — bore Ø, tip diameter, vane pitch, face parallelism, wear ring groove dimensions Surface NDE Liquid Penetrant (PT) 100% coverage on all vane surfaces, shroud transitions, and bore area — detects micro-cracks invisible visually
Dynamic Balancing ISO 1940-1 G2.5 or G6.3 grade on dedicated balancing machine; unbalance report per piece Certifications & Docs ISO 9001:2015 · PED CE · EN 10204 3.1 (material cert + balance report + CMM FAI) included per shipment
Applications by Industry
Double suction centrifugal pump impellers from Geluobao are deployed across these sectors:
Municipal Water Supply & Distribution PumpsAgricultural Irrigation Main Transfer PumpsHVAC Chilled Water & Cooling Tower CirculationFire Protection Systems (NFPA 20)Seawater Intake & Desalination Feed PumpsPower Plant Condenser Circulating WaterMine DewateringIndustrial Process Cooling Loops
Why Geluobao Impellers? No tooling. No minimum order. Send us your 3D drawing — first article in 2-4 weeks. - Replicast CS process: zero carbon defects, near-wrought density - Blade precision: ±0.15 mm profile accuracy, Ra 3.2-6.3 μm as-cast - Materials: CF8M (316), 2205 Duplex, 2507 Super Duplex, 17-4PH - Balance: ISO 1940-1 G2.5/G6.3 — dynamic balancing included - single piece or production runs
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Questions? Talk to us directly. Email: sales@globalmetalcasting.com WhatsApp: +86-19577716682 Or simply send your drawing for a free casting feasibility review — we'll respond within 24 hours.
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double suction pump impellers through ceramic shell lost foam process in stainless steel and duplex alloys
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