Goulds 3196 STX Impeller Replacement — 100% Interchangeable, All Alloys
The Goulds 3196 STX small frame impeller (OEM Item 101) is one of the most frequently replaced wet end components in North American chemical process plants. Because STX impellers operate at higher specific speeds within compact volute geometries, even minor deviations in vane profile or hub taper can shift the pump curve away from its BEP — increasing vibration, accelerating bearing wear, and reducing mean time between repairs. A properly engineered aftermarket replacement must replicate not just the bolt-circle dimensions but the full hydraulic geometry: vane inlet angle, shroud curvature, rear pump-out vane clearance, and shaft bore tolerance. This guide covers the metallurgical options, dimensional verification standards, and quality documentation you should require when sourcing a replacement STX impeller — whether in standard CF8M, high-strength CD4MCuN, or fully corrosion-resistant Hastelloy C-276.
Technical Specifications
| Specification | Detail |
|---|---|
| Pump Compatibility | ITT Goulds 3196 STX (Small Frame) |
| OEM Part # | Item 101 (Impeller) — we can cross-reference your exact ITT Goulds part number for a 100% match |
| Our Part # | APP-3196-STX-101 |
| Impeller Type | Open vane with rear pump-out vanes; reverse vane design available |
| Max Flow (STX) | Up to 450 GPM (102 m³/h) |
| Dimensional Standard | ANSI / ASME B73.1 — all critical dimensions verified against OEM prints |
| Dynamic Balance | Grade G6.3 per ISO 1940-1 (G2.5 available on request) |
| Quality Documentation | Full EN 10204 3.1 MTR + PMI verification + dimensional inspection report |
Available Materials
| Material | ASTM Spec | PREN | Best For |
|---|---|---|---|
| CF8M (316SS) | ASTM A743 CF8M | ≥ 24 | General chemical process — enhanced pitting resistance vs standard 316 |
| CD4MCuN (Duplex SS) | ASTM A890 Gr. 1B | ≥ 35 | Chloride & seawater environments — 2× yield strength of CF8M |
| Hastelloy C-276 | ASTM A494 CW12MW | ≥ 64 | Oxidizing acids, wet chlorine, mixed acid streams |
| Titanium Grade 2 | ASTM B367 Gr. C-3 | ≥ 30 | Oxidizing chlorides, hypochlorites, nitric acid — all concentrations |
Engineering Application Note: Material selection is rarely one-size-fits-all. In chloride-bearing seawater cooling loops, we routinely steer clients away from standard CF8M — its PREN of just 24 offers minimal protection against pitting initiation once chloride levels exceed 500 ppm at operating temperature. Switching to CD4MCuN duplex stainless steel (PREN ≥ 35) doubles the material yield strength while delivering a step-change in localized corrosion resistance. For mixed-acid environments where oxidizing and reducing conditions coexist — common in specialty chemical batch reactors — Hastelloy C-276 remains the metallurgical benchmark with a PREN exceeding 64. Our application engineers can cross-reference your exact process fluid composition, temperature profile, and pH range against our internal corrosion database to recommend the optimal alloy grade.
Cross-Reference & Compatibility
- Fits Pump Series: ITT Goulds 3196 STX (Small Frame)
- OEM Part Identification: Impeller (Item 101)
- Our Part Number: APP-3196-STX-101
- Interchangeability: 100% dimensionally interchangeable — identical vane geometry, shaft bore, keyway, and wear ring fit
Related Goulds 3196 Replacement Parts
- MTX/LTX Shaft Sleeve Replacement →
- XLT-X / XL17 Large Frame Impeller →
- Durco Mark III Replacement Parts →
Lead Time & Rush Order Availability
- 📦 Standard Lead Time: 6–10 weeks for exotic alloy castings (CD4MCuN, Hastelloy C-276, Titanium) — manufactured with full EN 10204 3.1 MTR and PMI documentation
- ✅ Stock Availability: Select STX CF8M and CD4MCuN impellers in common diameters may be in stock — contact us for current inventory
- 🔥 Emergency Rush Orders: 3–4 weeks — Request expedited casting and priority machining
Disclaimer: ANSI Pumps Pro is an independent aftermarket manufacturer. Goulds and 3196 are registered trademarks of ITT Corporation. All OEM part numbers and trademarks are used for compatibility reference only. We are not affiliated with or endorsed by ITT Goulds.
⚠️ Quality & Compliance Assurance
All pumps and components from ANSI Pumps Pro are manufactured to ASME B73.1 dimensional specifications. Each shipment includes certified Material Test Reports (MTRs), CMM dimensional inspection reports, and hydrostatic test certificates (1.5× MAWP). 100% dimensional interchangeability guaranteed. Full material traceability from heat number to your receiving dock.