3G Series Three Screw Pump
A three screw pump with high volumetric and mechanical efficiency, built for non-corrosive oil and lubricating liquids at flows of 2.4–241.7 m³/h and temperatures up to 350 °C.
The 3G series is a triple screw pump designed for conveying oils and lubricating liquids that resemble oil, with no solid particles and no corrosive attack. It is published with high volumetric and mechanical efficiency, smooth operation, a simple structure and a reasonable design.
The liquid is enclosed in the cavities formed between the meshing screws and pushed continuously along the screw axis to the outlet, so the output is stable and free of pulsation and the medium is not stirred. The published working envelope is 2.4–241.7 m³/h of flow with heads from 60 to 250 m and medium temperatures up to 350 °C.
Motors are published from 11 kW to 75 kW with drives at 950 r/min and 1450 r/min, and the NPSH required is 5.5 m. Because the pump is self-priming and quiet in operation, it is widely used by petroleum, chemical, metallurgical, electric power, shipbuilding and machinery-manufacturing plants for fuel, lubricating and hydraulic oil duty.
| Parameter | Specification |
| Pump type | Triple screw positive-displacement pump |
| Flow rate | 2.4–241.7 m³/h |
| Head | 60–250 m |
| Pressure stages | 0.6 MPa, 0.8 MPa and 1.0 MPa in the published model table |
| Medium temperature | Up to 350 °C |
| Motor power | 11–75 kW |
| Speed | 950 r/min and 1450 r/min |
| NPSH required | 5.5 m |
| Media | Non-corrosive oils and lubricating liquids similar to oil, free of solid particles |
| Published advantages | High volumetric and mechanical efficiency, smooth operation, simple structure, reasonable design |
| Model | Flow (m³/h) | Pressure (MPa) | Speed (r/min) | Motor (kW) | NPSHr (m) |
| 90*2-42 | 28.2 | 0.6 | 950 | 11 | 5.5 |
| 90*2-42 | 43.1 | 0.6 | 1450 | 15 | 5.5 |
| 90*2-42 | 27.5 | 1.0 | 950 | 15 | 5.5 |
| 90*2-46 | 34.0 | 0.8 | 950 | 11 | 5.5 |
| 90*2-46 | 52.6 | 0.6 | 1450 | 15 | 5.5 |
| 100*2-46 | 48.0 | 0.8 | 950 | 15 | 5.5 |
| 100*2-46 | 72.7 | 0.6 | 1450 | 18.5 | 5.5 |
| 100*2-51 | 56.9 | 0.6 | 950 | 15 | 5.5 |
| 100*2-51 | 86.9 | 0.6 | 1450 | 22 | 5.5 |
| 110*2-46 | 60.9 | 0.6 | 950 | 18.5 | 5.5 |
| 110*2-46 | 96.7 | 0.6 | 1450 | 30 | 5.5 |
| 120*2-42 | 67.9 | 0.6 | 950 | 18.5 | 5.5 |
| 120*2-42 | 108 | 0.6 | 1450 | 30 | 5.5 |
| 120*2-46 | 79.6 | 0.6 | 950 | 22 | 5.5 |
| 120*2-46 | 126 | 0.6 | 1450 | 37 | 5.5 |
| 150*2-46 | 158 | 0.6 | 950 | 45 | 5.5 |
Values as published by the manufacturer for the three screw pump family. Each model is listed for a 950 r/min and a 1450 r/min drive and additional 0.8 MPa and 1.0 MPa duty points are published for the same sizes; the shaft power is listed separately from the motor rating.
| Item | Published option |
| Pump type | Triple screw positive-displacement pump with a simple, published as reasonable, structure |
| Construction options | Insulated and non-insulated builds are published; the insulated build suits high-viscosity media where the suction range must be kept high without cavitation |
| Efficiency | Published as high volumetric and mechanical efficiency with smooth operation |
| Media contact | Published for non-corrosive oils and lubricating liquids similar to oil with no solid particles |
| Temperature capability | Up to 350 °C |
| Drive | 950 r/min and 1450 r/min; motors from 11 kW to 75 kW |
| Self-priming | Self-priming behaviour with a stable, non-pulsing output |
- Petroleum plants: Transfers crude oil, fuel oil and refined products between tanks and process units.
- Chemical plants: Circulates non-corrosive oil-based process liquids and heat-transfer oils.
- Metallurgical plants: Supplies lubricating and hydraulic oil in rolling and processing lines.
- Electric power: Feeds fuel oil and lubricating oil circuits in power stations.
- Shipbuilding: Handles fuel and lubricating oil transfer on board ship.
- Machinery manufacturing: Delivers hydraulic and lubricating oil in machine-building plants.
- Fuel oil supply: Provides a stable, pulse-free feed to burners and engines.
- Set the drive speed from the required flow: the same casing gives roughly 1.5 times the flow at 1450 r/min compared with 950 r/min, with a correspondingly larger motor.
- Read the shaft power and the motor rating separately, because the published table lists both and the motor is sized above the absorbed power.
- Confirm the liquid is a non-corrosive oil or oil-like lubricant free of solid particles, which is the published condition for the 3G series.
- Check the pressure stage needed against the 0.6, 0.8 and 1.0 MPa duty points published for the same sizes.
- Verify the medium temperature against the published 350 °C limit and confirm the seal arrangement at order stage.
- Allow 5.5 m of NPSH required in the suction design and keep the suction line as short and straight as the layout permits.
What is the difference between the 3G and 3GB three screw pumps?
Both are triple screw positive-displacement pumps published for non-corrosive oil duty with the same flow, head and temperature envelope; the model tables and duty points are published together for the three screw pump family, and the exact build is confirmed against the medium at order stage.
What flow and head does the 3G series cover?
From 2.4 to 241.7 m³/h of flow with heads from 60 to 250 m, at medium temperatures up to 350 °C.
Why does a three screw pump give a steadier flow than a gear pump?
The screws enclose the liquid in sealed cavities that travel continuously along the axis, so the discharge is uniform and pulse-free and the medium is not stirred, which the manufacturer publishes as a reason to use the design for sensitive oil-based liquids.
Which speed should I select, 950 or 1450 r/min?
Take the lower speed when the required flow is met, since it reduces wear and noise; move to 1450 r/min when the same casing has to deliver more flow, accepting the larger motor rating published for that duty point.
What is the flow and head range of the 3G three screw pump?
Flow from 2.4 to 241.7 m³/h and heads from 60 to 250 m, published for the 950 r/min and 1450 r/min drives.
What liquids can the 3G pump handle?
Non-corrosive oils and lubricating liquids similar to oil, free of solid particles, at temperatures up to 350 °C.
What motor power does the 3G series use?
Motors from 11 kW to 75 kW, with the shaft power published separately for each duty point and an NPSH required of 5.5 m.
Does the 3G pump produce a pulsating flow?
No. The three screws carry the liquid in sealed cavities along the screw axis, so the output is continuous and stable without pulsation.
Which industries use the 3G three screw pump?
Petroleum, chemical, metallurgical, electric power, shipbuilding and machinery manufacturing, for fuel, lubricating and hydraulic oil duty.
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How to Select a 3G Triple Screw Pump
Quick answer: The 3G is selected from viscosity, temperature and discharge pressure. It covers 2.4–241.7 m³/h and 60–250 m head for non-corrosive oils free of solids up to 350 °C, in cast steel with an insulated version for high-viscosity media.
Selection Data to Send Our Engineers
- Oil or liquid type
- Working viscosity
- Flow rate
- Discharge pressure
- Medium temperature
- Insulated or non-insulated construction
Industry Applications
Explore how this equipment can be applied in related industrial sectors and review application-specific selection guidance.