SM Series Three Spindle Screw Pump

The SM series is a three spindle screw pump for low-viscosity, poorly lubricated liquids, and it also handles media that contain impurities or particles. The published working envelope is 0.6–600 m³/h of flow with heads from 0 to 6 MPa and a viscosity band of 3–760 cSt.

The pump is a volumetric machine: rotating the screw forms a sealed chamber inside the pump that moves forward and carries the liquid from the suction end to the discharge end. That motion is straight-line and continuous, so the medium is conveyed without stirring and without pulsation, and the output stays stable.

The series is published as running smoothly with good suction capability, small size, low noise, low vibration, simple structure and easy disassembly. The metal parts in contact with the medium can be supplied in different materials to match different media and working conditions, and the medium temperature is published up to 150 °C. Typical duties are power generation, petroleum and natural gas refineries, cement and building materials, rubber and internal mixers, coal power, diesel and heavy oil handling, water conservancy and marine engineering.

• Power generation: Used as conveying, oil-supply and loading pumps for light and heavy diesel, heavy oil, crude oil, coolant, cooling water and grinding fluid.
• Petroleum and gas refineries: Transfers, circulates and mixes clean lubricating liquids such as engine oil, lubricating oil, fuel oil and paraffin.
• Cement and building materials: Handles process liquids in cement and building-materials plants.
• Rubber and internal mixers: Serves media handled in rubber processing and internal-mixer duty.
• Coal power and heavy oil: Suits coal-fired power stations and heavy-oil circuits.
• Water conservancy and marine: Applied in water conservancy engineering and marine engineering.
• Chemical industry: Handles clean, lubricating liquids of low to high viscosity such as additives, resins and coatings.

1. Send the working viscosity with the enquiry, because the published band is 3–760 cSt and the same size gives different flow and shaft power at different viscosities.
2. Confirm the medium temperature stays within the published 150 °C limit.
3. State whether the medium carries impurities or particles, so the material build of the contact parts can be reviewed against the published option of different metals.
4. Check the duty point against the published 0.6–600 m³/h and 0–6 MPa envelope and expect the exact figures to be confirmed from the size performance curves.
5. Prefer the SM series where the liquid is low-viscosity or poorly lubricated, since the three spindle design is published for exactly that condition.
6. Allow for the low-vibration, low-noise behaviour of the hydraulically balanced rotor when the pump is positioned near occupied areas.