SK Series Water Ring Vacuum Pump and Compressor
A liquid ring vacuum pump that also works as a compressor, covering 1.5–120 m³/min with an ultimate vacuum of −0.093 MPa and compressor pressure up to 1 MPa.
The SK series is a liquid ring pump that can be operated either as a vacuum pump or as a compressor, so one machine covers both duties in a plant. The published vacuum range runs from 1.5 to 120 m³/min with an ultimate vacuum of −0.093 MPa, and the same pump is published to deliver compressed gas at pressures from 0 to 1 MPa.
Water forms the ring that seals and compresses the gas, which keeps the process nearly isothermal. The manufacturer publishes this as an advanced isothermal compression technology that makes the pump safe for flammable and explosive special gases, because the temperature rise across the machine stays low.
The vacuum-pump drive power is published from 3 kW to 185 kW and the compressor drive from 4 kW to 75 kW, at speeds of 590 to 1450 r/min, with inlet and outlet connections from 70 mm up to 300 mm. The series is used in the chemical, textile, metallurgical, sugar and pharmaceutical industries to extract air and other non-corrosive, water-insoluble, solid-free and dust-containing gases.
| Parameter | Specification |
| Pump type | Liquid ring (water ring) vacuum pump, also published as a compressor |
| Max. capacity | 1.5–120 m³/min |
| Capacity at −0.093 MPa suction | 1.35–110 m³/min |
| Ultimate vacuum | −0.093 MPa (710 mmHg); −680 mmHg on SK-1.5 |
| Vacuum-pump motor | 3–185 kW |
| Compressor motor | 4–75 kW |
| Speed | 590–1450 r/min |
| Compressor pressure | 0–1 MPa |
| Inlet / outlet | 70–300 mm |
| Water consumption | 10–260 L/min |
| Model | Max. capacity (m³/min) | Capacity at −0.093 MPa (m³/min) | Vacuum pump (kW) | Compressor (kW) | Speed (r/min) | Inlet / Outlet (mm) | Water (L/min) |
| SK-1.5 | 1.5 | 1.35 | 3 | 4 | 1450 | 70 / 70 | 10~15 |
| SK-3 | 3 | 2.8 | 5.5 | 7.5 | 1450 | 70 / 70 | 15~20 |
| SK-6 | 6 | 5.4 | 11 | 15 | 1450 | 80 / 80 | 20~30 |
| SK-9 | 9 | 8.1 | 15 | 22 | 970 | 80 / 80 | 30~40 |
| SK-12 | 12 | 11 | 18.5 | 30 | 970 | 80 / 80 | 40~50 |
| SK-15 | 15 | 13.5 | 30 | 45 | 970 | 80 / 80 | 50~60 |
| SK-20 | 20 | 18 | 37 | 55 | 740 | 150 / 150 | 60~80 |
| SK-30 | 30 | 28 | 55 | 75 | 740 | 150 / 150 | 70~100 |
| SK-42 | 42 | 37.2 | 75 | — | 740 | 150 / 150 | 95~130 |
| SK-60 | 60 | 54 | 95 | — | 590 | 250 / 250 | 140~180 |
| SK-85 | 85 | 76.5 | 132 | — | 590 | 250 / 250 | 180~220 |
| SK-120 | 120 | 110 | 185 | — | 590 | 300 / 300 | 220~260 |
Values as published by the manufacturer. Vacuum and compressor duties are both listed for every size; the maximum vacuum degree stated for the range is −450 mmHg and the published ultimate vacuum is −0.093 MPa (710 mmHg).
| Item | Published option |
| Casing and internals | Liquid ring construction published for vacuum and compressor duty in the same machine |
| Ring liquid | Water, consumed at 10–260 L/min depending on size |
| Compression behaviour | Advanced isothermal compression technology published to avoid dangerous temperature rise with flammable and explosive gases |
| Compressor duty | Published for gas compression at 0–1 MPa |
| Gas compatibility | Air and other non-corrosive, water-insoluble, solid-free and dust-containing gases |
| Connections | 70, 80, 150, 250 and 300 mm inlet and outlet depending on size |
| Motor | 3–185 kW for vacuum duty and 4–75 kW for compressor duty; supply confirmed at order stage |
- Chemical industry: Extracts air and process gas from reactors, dryers and distillation systems.
- Textile plants: Handles vacuum duty in yarn and fabric finishing equipment.
- Metallurgy: Serves vacuum degassing and treatment duties in metal processing.
- Sugar refineries: Powers vacuum pans and evaporation equipment in sugar production.
- Pharmaceutical: Supplies vacuum for drying, filtration and process transfer under vacuum.
- Gas compression: Operates as a compressor at up to 1 MPa where a liquid ring compressor is required.
- Flammable gas handling: Isothermal compression makes the pump suitable for flammable and explosive special gases.
- Decide first whether the machine runs as a vacuum pump or as a compressor, then read the corresponding power column: SK-1.5 is published at 3 kW for vacuum duty and 4 kW for compressor duty.
- Use the capacity at the working pressure. At a suction pressure of −0.093 MPa the published capacity is 1.35–110 m³/min, below the 1.5–120 m³/min maximum.
- Plan the water supply carefully at the large end: consumption rises from 10–15 L/min on SK-1.5 to 220–260 L/min on SK-120.
- Check the inlet and outlet diameter of each size against the pipework, since the connections step from 70 mm to 80 mm, 150 mm, 250 mm and 300 mm.
- Confirm that the gas is non-corrosive, water-insoluble and free of solid particles, and that any dust loading is acceptable for the ring.
- Allow for the speed difference between sizes when the drive is selected: the smaller models run at 1450 r/min and SK-60 and above at 590 r/min.
Can an SK pump be used as a compressor?
Yes. The SK series is published for both duties, giving a vacuum down to −0.093 MPa and compressor pressures of 0 to 1 MPa from the same machine, with separate motor ratings listed for each duty.
What is the largest SK size and what does it deliver?
SK-120 is the largest published size, with a maximum capacity of 120 m³/min and 110 m³/min at a suction pressure of −0.093 MPa, a 185 kW vacuum-duty motor, 300 mm connections and 220–260 L/min of sealing water.
Why is a liquid ring pump suitable for flammable gas?
The water ring compresses the gas almost isothermally, so the temperature rise stays low. The manufacturer publishes this isothermal compression technology as the reason the pump is safe for flammable and explosive special gases.
Which gas conditions does the SK series accept?
Air and other non-corrosive, water-insoluble gases without solid particles, including gases that carry dust. Corrosive or solids-bearing media require a different selection.
What is the ultimate vacuum of the SK water ring pump?
−0.093 MPa, published as 710 mmHg, with a maximum vacuum degree of −450 mmHg stated for the range; SK-1.5 is published at −680 mmHg.
Can the SK series be used as a compressor as well as a vacuum pump?
Yes. Every size is published with both a vacuum duty and a compressor duty, with compressor pressure from 0 to 1 MPa and a separate motor rating for each duty.
What capacity range does the SK series cover?
From 1.5 to 120 m³/min of maximum capacity, equivalent to 1.35–110 m³/min at a suction pressure of −0.093 MPa.
What are the power and connection sizes?
Vacuum-duty motors run from 3 kW to 185 kW and compressor-duty motors from 4 kW to 75 kW, with inlet and outlet connections of 70 mm to 300 mm.
Which industries use the SK vacuum pump?
Chemical, textile, metallurgical, sugar and pharmaceutical industries, for extracting air and other non-corrosive, water-insoluble and dust-containing gases.
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How to Select an SK Liquid Ring Vacuum Pump
Quick answer: The SK is selected from the required vacuum, the gas composition and the pumping rate. It covers 0.8–120 m³/min at a vacuum degree of -0.089 to -0.097 MPa and tolerates water vapour, flammable gases and small amounts of dust and liquid.
Selection Data to Send Our Engineers
- Required vacuum or pressure
- Required pumping rate
- Gas composition and temperature
- Vapour, flammable or explosive components
- Sealing-water supply and temperature
- Motor voltage and frequency
Industry Applications
Explore how this equipment can be applied in related industrial sectors and review application-specific selection guidance.