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Impeller

Impeller (Paper machinery industry)

Impeller (Paper machinery industry)

Stainless steel, carbon steel, low alloy steel, medium alloy steel, copper alloy, aluminum alloy, nickel-based alloy, cobalt-based alloy, etc.

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Impeller

Impeller

Stainless steel, carbon steel, low alloy steel, medium alloy steel, copper alloy, aluminum alloy, nickel-based alloy, cobalt-based alloy, etc.

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Stainless steel casting 2BV pump Impeller

Stainless steel casting 2BV pump Impeller

2BV series impeller

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Stainless steel Double Suction Centrifugal Pump Impeller

Stainless steel Double Suction Centrifugal Pump Impeller

What Is a Double Suction Centrifugal Pump Impeller?A double suction centrifugal pump impeller is the rotating heart of a horizontal split-case centrifugal pump where fluid enters both sides of the impeller eye simultaneously. This symmetrical dual-inlet design inherently balances axial thrust — the hydraulic force that pushes the impeller shaft toward one side — eliminating or drastically reducing the need for thrust bearings and allowing larger flow capacities with higher efficiency than equivalent single-suction designs.Double suction impellers are standard equipment in municipal water supply systems, irrigation pumping stations, HVAC cooling towers, fire protection networks, and industrial process water loops where high volume, low-to-medium head, and continuous reliable operation are required.Zibo Geluobao produces double suction impellers through investment casting 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 ImpellersCritical Design FeaturesSymmetrical dual-volute inlet — Two mirror-image blade sets sharing a common back shroud; fluid enters both eyes axially and exits radiallyEnclosed (shrouded) design — Front and back shrouds fully enclose the vanes for maximum hydraulic efficiencyWhy Investment Casting?Blade profile accuracy ±0.15–0.30 mm — Ceramic shell captures complex curved vane geometry that sand molds distortRa 3.2–6.3 μm as-cast blade surfaces — Reduces hydraulic skin friction; no need for expensive blade polishingNo sand inclusions at blade roots — The #1 failure point in sand-cast impellers (stress concentration + corrosion initiation) is eliminatedPiece-to-piece consistency — Every impeller in a batch matches within ±0.05 mm; dynamic balancing is predictable and fastMaterial flexibility — Same tooling produces CF8M, Duplex 2205, Super Duplex 2507 — just change melt compositionAvailable MaterialsGradeStandardBest ApplicationKey PropertyCF8M / 316SSASTM A351 J92900Municipal water, irrigation, cooling tower circulation, general freshwater serviceMolybdenum-enhanced chloride resistance up to ~200 ppm Cl⁻CF3M / 316LASTM A351 J92800Chemical process pumps handling dilute acids/alkalis; welded assembliesLow carbon (<0.03%) prevents sensitization during weldingDuplex 2205 (S32205)ASTM A995Brackish water, seawater intake, cooling towers with chlorides >500 ppmPREN 34–36; SCC resistant; 2× yield strength of 316Super Duplex 2507 (S32750)ASTM A995Offshore platforms, desalination plants, aggressive seawater with H₂S tracesPREN ≥40; extreme pitting/crevice corrosion resistanceCD4MCuNASTM A995 J93372Sulfuric/phosphoric acid transfer pumps, fertilizer industryCopper-alloyed duplex for reducing acid environments17-4PH (S17400)ASTM A747High-head pumps requiring HRC 35–40 hub strength + corrosion resistancePrecipitation hardenable to 1380 MPa UTSInvestment Casting vs Sand Casting — Direct ComparisonAttributeInvestment 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 distortionBlade Surface RoughnessRa 3.2–6.3 μm as-cast (usable without machining)Ra 25–100 μm (requires grinding/polishing)Batch ConsistencyVariance <0.05 mm between piecesVariance 0.3–1.0 mm; each piece needs individual trim/balance adjustmentSand Inclusion / PorosityZero (ceramic shell process)Common defect, especially at thin vane root fillets — major fatigue/corrosion initiation siteFirst Article Lead Time2–3 weeks from drawing approval6–10 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 Quantity1 piece acceptedEconomical MOQ 5–10 piecesQuality Assurance ProtocolChemical CompositionOES spectrometer every heat — Cr/Ni/Mo/N verified against ASTM limits; ferrite measurement for all duplex grades (target 35–65%)Mechanical PropertiesTensile test coupon from same heat — YS, UTS, elongation, hardness documented per EN 10204 3.1Dimensional VerificationCMM full inspection — bore Ø, tip diameter, vane pitch, face parallelism, wear ring groove dimensionsSurface NDELiquid Penetrant (PT) 100% coverage on all vane surfaces, shroud transitions, and bore area — detects micro-cracks invisible visuallyDynamic BalancingISO 1940-1 G2.5 or G6.3 grade on dedicated balancing machine; unbalance report per pieceCertifications & DocsISO 9001:2015 · PED CE · EN 10204 3.1 (material cert + balance report + CMM FAI) included per shipmentApplications by IndustryDouble 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 DewateringIndust

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