At a glance
- Type
- Dry oil-free screw
- Architecture
- Single-stage
- Cooling
- Air-cooled (A) or water-cooled (W)
- Oil in compression
- None — oil-free by design
Overview
PureFlow SP is a single-stage dry oil-free screw compressor. No oil enters the compression chamber, so the air is oil-free at the airend by design — not by downstream filtration. It suits moderate pressure and intermittent or part-load duty where discharge temperature remains within margin.
Model range
PureFlow SP covers single-stage dry oil-free compression for moderate pressure applications. For higher pressures or continuous duty, see PureFlow DP (two-stage with intercooler).
Architecture
Single-stage dry screw
- Oil in compression
- None
- Cooling
- Air-cooled or water-cooled
- Drive
- Contact SIND for configuration
Best for
Moderate pressure, part-load
- Pressure range
- Contact SIND
- Load profile
- Intermittent or part-load
- Ambient limit
- Within temperature margin
Applications
Oil-free air required
- Pharmaceutical and medical air
- Food and beverage packaging
- Electronics and semiconductor
- Photovoltaic manufacturing
- Textile air-jet weaving
Technology
Technology Platform
PureFlow SP uses dry oil-free single-stage screw compression. Unlike oil-injected machines, no oil is present in the compression chamber. The twin-screw rotors are coated to prevent contact and maintain tight clearances. Ambient air is compressed directly, producing oil-free air at the airend discharge.
Performance Boundaries
Single-stage dry screw compression is temperature-limited. The discharge temperature must remain below the threshold where rotor coating degradation begins. This limits the usable pressure ratio and makes single-stage dry screw best suited for moderate pressures and intermittent or part-load duty.
Cooling Options
PureFlow SP is available in air-cooled (A suffix) and water-cooled (W suffix) configurations. Air-cooled models reject heat directly to ambient air — simpler installation but higher noise and no heat recovery potential.
More technical detail
Technology Platform
The absence of oil in the compression chamber eliminates the need for oil separators, chamber oil changes, and oily condensate disposal. This reduces maintenance complexity and environmental compliance burden. However, the air still requires downstream drying and filtration: oil-free air is not dry air and is not particle-free air.
Performance Boundaries
For higher pressures, hotter site ambients, or continuous full-load operation, the two-stage PureFlow DP (with intercooler) is the appropriate choice. The choice between SP and DP turns on discharge pressure, site ambient temperature, and load profile.
Intake Air Requirements
Dry oil-free compressors require clean, dry intake air. The intake should be located away from road dust, engine exhaust, and process vents. Working drains at every low point in the system are essential to prevent condensate accumulation.
Applications
Scenario A: Pharmaceutical Packaging
— A pharmaceutical plant requires oil-free compressed air for tablet coating and packaging lines. Working pressure 8 bar(g), flow 3–8 m³/min, intermittent operation across two shifts.
Scenario B: Electronics Assembly
— An electronics manufacturer needs clean, dry air for PCB handling and pneumatic placement tools. Working pressure 7 bar(g), flow 5–12 m³/min, continuous operation during production hours.
Scenario C: Food & Beverage Bottling
— A beverage plant requires oil-free air for PET bottle blowing and filling. Working pressure 8 bar(g), flow 8–15 m³/min, seasonal peak demand.
More application detail
Industry Fit Matrix
| Industry | Typical Pressure bar(g) | Typical Flow m³/min | Key Requirement |
|---|---|---|---|
| Pharmaceutical | 7–8 | 2–10 | Oil-free, GMP compliance |
| Food & Beverage | 7–8 | 5–15 | Oil-free, food-safe materials |
| Electronics | 7 | 3–12 | Clean, dry, particle-free |
| Textile (air-jet) | 6–7 | 10–25 | Stable pressure, oil-free |
| Glass Container | 7–8 | 5–20 | Oil-free for mould coating |
Installation Considerations
- Intake air quality — Locate intake away from dust, exhaust fumes, and process vents. Dry oil-free compressors are sensitive to intake contamination.
- Ventilation — Air-cooled models require adequate compressor room ventilation to prevent hot-air recirculation. Water-cooled models reduce room heat load.
- Drainage — Install working drains at every low point in the air distribution system to prevent condensate accumulation.
- Downstream treatment — Oil-free air still requires drying and filtration to meet instrument-air or process-air quality standards.
FAQ
SP or DP?
Take discharge pressure, site ambient and load profile. One dry stage is temperature-limited, so high pressure, hot ambient or continuous full-load running points to DP.
Is the air oil-free?
At the airend, by design — not by certificate. Oil-free means the machine adds no oil; delivered air quality also depends on intake conditions and downstream treatment.
Do I still need a dryer and filters?
Yes. Drying is set by the required dew point; filtration handles particulate and whatever arrives with the intake air.
Air-cooled or water-cooled?
Decide on design summer ambient, cooling-water availability, noise limits and whether heat recovery has a use.
Is 60 Hz available?
50 Hz standard. 60 Hz configuration on request.
Ownership & service
Energy, maintenance and service
Target Industries
Pharmaceutical and medical air, food and beverage packaging, electronics and semiconductor assembly, photovoltaic manufacturing, textile air-jet weaving, glass container forming, coating and finishing, instrument air in petrochemical, power and water utilities.
Maintenance Advantage
Dry oil-free compression eliminates oil separators, chamber oil changes, and oily condensate disposal. This reduces maintenance complexity and environmental compliance burden compared with oil-injected machines.
Selection Advice
Choose PureFlow SP for moderate pressure applications with intermittent or part-load duty. Choose PureFlow DP for higher pressures, hotter ambients, or continuous full-load operation. Contact SIND with your duty point (pressure, flow, ambient) for model selection.
Specifications vary by configuration; confirm with the datasheet. Dimensions and weights are indicative; request the installation drawing for the specific model before designing foundations or access routes.
