Two external-timing-gear-synchronised screws counter-rotate never making contact. Fluid entering the pump is axially advanced between the intermeshing screw threads in discrete sealed chambers. The symmetric dual-inlet design (fluid enters from both ends toward centre outlets or vice versa) balances axial thrust loads, eliminating thrust bearings in many configurations. Non-contact operation means no metal particle contamination. Clean-in-Place compatibility and 3-A hygienic certification available for food and pharmaceutical grades.
Challenges
Tight Clearance Sensitivity to Abrasive Solids
Non-contact screw design relies on liquid film lubrication; solids >500 µm cause scoring.
Gas Entrainment Efficiency Reduces with Speed
Above 2,000 RPM, gas-liquid slip increases; multiphase handling efficiency drops.
High Initial Cost vs. Single-Screw
Twin external timing gear and precision screw machining commands significant premium.
Bidirectional Seal Design Required
Symmetric dual-inlet creates equal pressure at both shaft ends requires two balanced seals.
Complex Maintenance of Timing Gear System
External gear lubrication requires scheduled inspection and oil changes.
Solutions
- 100–500 µm Inlet Strainer: Removes particles before screw clearance zone; maintains non-contact hydrodynamic film.
- Hardened Screw Chrome-Plated Surface: Increases surface hardness to 60 HRC; resists soft abrasive particle scratching.
- Double-Acting Balanced Mechanical Seal: Seals both inlet ports simultaneously; handles full differential pressure at shaft ends.
- Integral Oil-Bath Timing Gear Box: Isolated lubrication circuit; scheduled 4,000-hour oil change interval.
- VFD with Gas-Fraction Monitoring: Inlet gas fraction sensor adjusts speed to maintain stable multiphase pumping efficiency.
Applications
- Food & Beverage: High-capacity dairy, sauce, beverage and ingredient transfer 3-A hygienic certified.
- Pharmaceutical: API solution metering, high-pressure filtration feed, filling line supply pump.
- Oil & Gas: Multiphase wellhead transfer, crude oil boosting, gas-liquid-solid transfer.
- Chemical: Polymer, adhesive, resin, and solvent high-pressure transfer.
- Cosmetics: Large-volume filling line supply, cream/lotion tank-to-tank high-pressure transfer.
Product Catalogue & Technical Datasheet
Model | Flow Rate (m³/h) | Speed (RPM) | Max Pressure (bar) | Viscosity Max (cP) | Inlet/Outlet Ø (DN) | Gas Fraction Max | Solid Particle Max (µm) | L × W × H (mm) | Weight (kg) |
TSP-002 | 0.2–2 | 100–3,000 VFD | Up to 40 | 500,000 | DN 25 | 50% | 500 | 480×220×280 | 38 |
TSP-010 | 1–10 | 100–3,000 VFD | Up to 40 | 500,000 | DN 40 | 50% | 500 | 620×280×350 | 65 |
TSP-030 | 5–30 | 100–2,500 VFD | Up to 40 | 500,000 | DN 65 | 50% | 500 | 780×350×440 | 105 |
TSP-080 | 15–80 | 100–2,000 VFD | Up to 36 | 300,000 | DN 80 | 50% | 500 | 980×440×550 | 175 |
TSP-200 | 40–200 | 100–2,000 VFD | Up to 36 | 200,000 | DN 100 | 50% | 500 | 1,250×560×680 | 290 |
TSP-500 | 100–500 | 100–1,500 VFD | Up to 25 | 150,000 | DN 150 | 40% | 500 | 1,600×700×840 | 480 |