M3 Series ANSI Chemical Process Pump — Durco Mark III Interchangeable
100% dimensionally interchangeable with Durco (Flowserve) Mark III -- Group I, II, and III frames. Reverse vane impeller design reduces axial thrust and seal chamber pressure.
External impeller adjustment mechanism -- the industry most innovative design. Allows fast, accurate impeller clearance setting without pump disassembly.
Full wet-end alloy coverage: Hastelloy C-276, Titanium Pd7B, CD4MCuN duplex, CN7M Alloy 20, Nickel, Zirconium. 20-40% cost savings vs OEM with identical performance.
Product Details
| Application | Chemical processing, petrochemical refining, corrosive chemical transfer, pulp & paper mill liquors, reverse vane impeller applications, high-temperature services, MRO replacement programs, EPC project procurement |
| Flow Rate | Up to 7,500 GPM (1,703 m3/h) |
| Head Range | Up to 990 ft (302 m) |
| Temperature | -73 degrees C to 370 degrees C (-100 degrees F to 700 degrees F) |
| Materials | CF8M (316SS), CD4MCuN (Duplex), CN7M (Alloy 20), WCB (Carbon Steel), Hastelloy B, Hastelloy C-276, Nickel 200, Titanium Grade Pd7B, Zirconium 702 |
| Pressure Rating | Up to 27 bar (400 PSIG) |
M3 Series — The Direct Durco Mark III Replacement
The M3 Series is a 100% dimensionally interchangeable replacement for the Durco (Flowserve) Mark III ANSI B73.1 chemical process pump. Same reverse vane impeller, same rear pull-out design, same mounting dimensions — just better lead times and pricing.
- Reverse Vane Impeller — Reduces seal chamber pressure by up to 40%. Lower axial thrust extends bearing life by 2–3× compared to standard open impellers.
- Rear Pull-Out Design — Full rotating assembly removes from the back without disturbing piping or the driver. Ideal for pulling maintenance from the rear.
- Group I–III Coverage — From 1K1.5×1LF-4 through 3K10×8-17. Capacities to 5,000 GPM (1,135 m³/h).
- External Impeller Adjustment — Restore design clearance in minutes without disassembly.
- Seal Chamber Options — Standard bore, large bore, and TaperBore PLUS for optimal seal environment.
- ISO 9001:2015 Certified — Full EN 10204 3.1 MTR traceability on all pressure-containing components.
Durco Mark III vs. Goulds 3196 — Key Design Differences
| Feature | M3 Series (Durco Mark III) | G196 Series (Goulds 3196) |
|---|---|---|
| Impeller Type | Reverse vane (semi-open) | Open with back pump-out vanes |
| Axial Adjustment | External, rear-side | External, front-side |
| Maintenance Access | Rear pull-out (standard) | Front pull-out (standard) |
| Seal Chamber | TaperBore PLUS (larger bore) | Standard tapered bore |
| Bearing Frame | Group I / II / III | STX / MTX / LTX / XLTX |
Need a quote? Tell us your Mark III group size, material, and the parts or complete pump you need. We respond within 24 hours.
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