Here’s a general screw pump specification guide covering key technical parameters, materials, and performance criteria for selection:
Type: Single-screw (progressive cavity), Twin-screw, or Triple-screw
Flow Rate (Q): ___ m³/h or GPM (e.g., 5–500 m³/h)
Pressure (P): ___ bar or psi (e.g., up to 100 bar for high-pressure models)
Speed (RPM): ___ (e.g., 500–3,600 RPM)
Viscosity Range: ___ cP (e.g., 1–100,000 cP)
Temperature Range: ___ °C/°F (e.g., -20°C to +200°C)
Screw Rotor: Stainless steel (SS 316), hardened steel, or coated alloys.
Stator (for single-screw): Elastomers (NBR, EPDM, Viton) for abrasion resistance.
Casing: Cast iron, SS 304/316, or duplex steel.
Shaft Seal: Mechanical seal, lip seal, or packed gland.
Drive Shaft: Carbon steel or stainless steel.
Bearings: Oil-lubricated or grease-packed.
Self-Priming: Yes/No (typically 5–8 meters suction lift).
Efficiency: 70–90% (depends on viscosity and clearances).
Pulsation: Minimal (<1% for twin/triple-screw).
Allowable Solids Size: ___ mm (e.g., up to 10 mm for wastewater pumps).
Motor Power (kW/HP): ___ (e.g., 0.5–500 kW).
Drive Type: Direct coupling, belt drive, or gearbox.
Voltage/Frequency: 220V/380V, 50/60 Hz (or as required).
Industry Standards: API 676 (rotary pumps), ISO 5199, ATEX (explosion-proof).
Sanitary Standards: 3-A, EHEDG, FDA (for food/pharma).
Oil/Gas: Fuel transfer, crude oil, lubrication.
Marine: Cargo pumping, bilge, ballast.
Food: Chocolate, syrups, pastes.
Chemicals: Polymers, solvents, adhesives.
Wastewater: Sludge, sewage, abrasive fluids.
Heating/Cooling Jackets: For temperature-sensitive fluids.
Variable Speed Drive (VSD): For flow control.
Explosion-Proof Motor: For hazardous areas.
| Parameter | Value |
|---|---|
| Model | XYZ-200 Twin-Screw |
| Flow Rate | 50 m³/h (220 GPM) |
| Max Pressure | 15 bar (217 psi) |
| Speed | 1,450 RPM |
| Viscosity Range | 10–10,000 cP |
| Material | SS 316 rotors, CI casing |
| Motor Power | 22 kW (30 HP) |
| Seals | Double mechanical seal |
Define Requirements: Flow, pressure, fluid type (e.g., diesel, syrup, sludge).
Material Compatibility: Check chemical resistance (e.g., Viton for acids).
Consult Manufacturers: Provide specs to suppliers like Colfax, NETZSCH, or Alfa Laval.
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