Heavy-Duty Pulp Stock Process Pumps
Open-vane impeller with rear pump-out vanes handles up to 8% stock consistency without dewatering. Oversized suction inlet reduces fiber flocculation.
Low-pulse hydraulic design for fan pump and headbox approach flow — minimizes basis weight variation on the paper machine.
Heavy-duty LTX/XLTX bearing frame rated for 24/7 continuous mill service. Large-contour volute with clean-out ports for high-consistency stock.
Product Details
| Application | Pulp stock transfer at up to 8% consistency. Pressure screen feed, refiner supply, fan pump approach systems, whitewater return, broke handling, and paper machine wet-end services. |
| Flow Rate | Up to 7,500 GPM (1,700 m3/h) |
| Head Range | Up to 990 ft (300 m) |
| Temperature | Up to 450 degrees F (232 degrees C) |
| Materials | CF8M (316SS), CD4MCuN (Duplex SS), CN7M (Alloy 20), WCB, CA6NM — optimized for abrasion resistance in stock service |
| Pressure Rating | ANSI Class 300, up to 27 bar (375 PSIG) |
Heavy-Duty Pulp Stock Process Pumps
Yingsiman heavy-duty ANSI B73.1 stock pumps purpose-built for pulp transfer, stock screening, and paper machine approach systems. Engineered to handle pulp stock at consistencies up to 8% without dewatering or air binding — a common weakness of standard process pumps pressed into stock service.
Pulp & Paper Stock Applications
| Process Area | Service | Frame Size |
|---|---|---|
| Stock Prep | Pulper transfer, broke handling, high-density storage | MTX / LTX |
| Screening | Pressure screen feed, cleaner supply | MTX / XLTX |
| Refining | Refiner feed, stock blending | MTX / LTX |
| Approach System | Fan pump supply, headbox feed (low pulse) | XLTX |
| Wet End | Whitewater return, saveall feed, couch pit | STX / MTX |
| Broke System | Dry broke, wet broke repulping | LTX / XLTX |
Stock Pump Design Features
- Open-vane impeller with rear pump-out vanes — handles up to 8% consistency without dewatering. Minimizes axial thrust and prevents fiber accumulation behind the impeller.
- Oversized suction inlet reduces inlet velocity and prevents fiber flocculation — delivers more uniform sheet formation on the paper machine.
- Low-pulse hydraulic design for fan pump and headbox approach flow service — minimizes basis weight variation.
- Large-contour volute casing with clean-out ports for broke and high-consistency applications. Reduced NPSHr for hot stock and vacuum dewatering applications.
- Heavy-duty bearing frame (LTX/XLTX) rated for 24/7 continuous paper machine service — engineered for 7+ years between major overhauls.
Materials for Stock Service
| Material | Application |
|---|---|
| CF8M (316SS) | Standard stock, whitewater, paper machine wet end |
| CD4MCuN (Duplex SS) | High-consistency stock, abrasive filler content |
| CN7M (Alloy 20) | Acid stock, pH-controlled broke systems |
| WCB / CA6NM | High-pressure fan pump and headbox service |
Typical Operating Data
| Parameter | Range |
|---|---|
| Flow Rate | Up to 7,500 GPM (1,700 m³/h) |
| Head | Up to 990 ft (300 m) |
| Stock Consistency | Up to 8% (oven-dry basis) |
| Temperature | Up to 450°F (232°C) |
| Discharge Size | 1.5″ to 14″ |
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