The 3G series marine three-screw pump is designed and manufactured according to GB10887-89. It is a rotary positive displacement pump that uses the meshing principle of screw rotors to deliver liquid continuously and smoothly along the axial direction.
During operation, the driving screw and driven screws mesh with each other inside the pump sleeve. The conveyed medium is enclosed in sealed chambers formed between the screws and the inner surface of the liner, then pushed continuously toward the discharge port. This working principle allows the pump to provide stable pressure and smooth liquid transfer for the system.
The 3G series marine screw pump is suitable for conveying clean lubricating liquids without solid particles. Typical media include fuel oil, lubricating oil, hydraulic oil, crude oil, asphalt, and similar oil-based or lubricating liquids. The general viscosity range is 3.0–760 mm²/s. Higher-viscosity media may be conveyed after heating to reduce viscosity. The operating temperature is generally not higher than 350°C.
The 3G series includes general-purpose 3G models, 3GC marine models, and related configurations such as 3GR, 3Gr, 3GN, and 3GW. The pump is commonly equipped with a mechanical seal and is driven by an electric motor through a claw-type coupling. Viewed from the shaft extension end, the pump rotates clockwise.
Features & Advantages
- Continuous Linear Delivery: Provides smooth axial liquid transfer with no agitation and low pulsation.
- Low Vibration & Noise: The screw meshing design supports quiet and stable operation.
- High Pressure Capability: Suitable for systems requiring stable pressure and continuous flow.
- Simple Structure: Compact design with convenient assembly and disassembly.
- Lightweight & Compact: Smaller size and lower weight compared with many equivalent transfer systems.
- Low Wear: Suitable for clean lubricating liquids that help reduce internal wear during operation.
Typical Applications
The 3G series marine three-screw pump is widely used in petroleum, chemical fiber, metallurgy, machinery, electric power, machine tools, shipbuilding, glass, road construction, and other industries.
Typical system uses include:
- Lubrication pump in industrial equipment
- Hydraulic pump in hydraulic systems
- Transfer and booster pump in fuel oil systems
- Transfer and loading pump in oil transportation systems
- Marine fuel oil and lubricating oil transfer
- Asphalt and similar high-viscosity lubricating liquid transfer
Performance Range
- Flow Rate: 0.2–600 m³/h
- Maximum Working Pressure: Up to 6.3 MPa
- Viscosity Range: Generally 3.0–760 mm²/s
- Temperature: Generally not higher than 350°C
Materials
The following materials are listed in the source material:
- Driving and Driven Screws: 16MnCrS5, 40Cr, 45, 38CrMoALA
- Pump Body: HT200, QT450-10, ZCuSn10Pb1, ZG270-500
3GCL Series Technical Parameters
| Model | Flow Rate m³/h | Flow Rate L/min | Pressure MPa | Speed r/min | Shaft Power kW | Motor Power kW | Allowable Suction Vacuum Height m | Motor Model |
|---|---|---|---|---|---|---|---|---|
| 3GCL 50×2 | 18 | 300 | 4 | 2900 | 3.6 | 4 | 4.5 | 112M-2V1 |
| 3GCL 50×2 | 17.5 | 290 | 6 | 2900 | 5.2 | 5.5 | 4.5 | 132S1-2V1 |
| 3GCL 50×2 | 16 | 265 | 8 | 2900 | 7.2 | 7.5 | 4.5 | 132S2-2V1 |
| 3GCL 50×2 | 9 | 150 | 4 | 1450 | 1.9 | 2.2 | 4.5 | 100L1-4V1 |
| 3GCL 50×2 | 8.2 | 135 | 6 | 1450 | 2.6 | 3 | 4.5 | 100L2-4V1 |
| 3GCL 50×2 | 7.5 | 125 | 8 | 1450 | 3.6 | 4 | 4.5 | 112M-4V1 |
| 3GCL 70×2 | 25 | 415 | 4 | 1450 | 5 | 5.5 | 4.5 | 132S-4V1 |
| 3GCL 70×2 | 24.5 | 405 | 6 | 1450 | 7 | 11 | 4.5 | 160M-4V1 |
| 3GCL 70×2 | 24 | 400 | 8 | 1450 | 9 | 11 | 4.5 | 160M-4V1 |
| 3GCL 70×2 | 16 | 265 | 4 | 970 | 3.3 | 4 | 4.5 | 132M1-6V1 |
| 3GCL 70×2 | 15 | 250 | 6 | 970 | 4.8 | 5.5 | 4.5 | 132M2-6V1 |
| 3GCL 70×2 | 14 | 230 | 8 | 970 | 5.9 | 7.5 | 4.5 | 160M-6V1 |
| 3GCL 85×2 | 44 | 730 | 4 | 1450 | 9.5 | 11 | 4.5 | 160M-4V1 |
| 3GCL 85×2 | 43 | 715 | 6 | 1450 | 12.5 | 15 | 4.5 | 160L-4V1 |
| 3GCL 85×2 | 41 | 680 | 8 | 1450 | 15 | 18.5 | 4.5 | 180M-4V1 |
| 3GCL 85×2 | 30 | 500 | 4 | 970 | 6.7 | 7.5 | 4.5 | 160M-6V1 |
| 3GCL 85×2 | 28 | 465 | 6 | 970 | 8 | 11 | 4.5 | 160L-6V1 |
| 3GCL 85×2 | 26 | 430 | 8 | 970 | 10 | 15 | 4.5 | 180L-6V1 |
| 3GCL 100×2 | 72 | 1198 | 4 | 1450 | 16 | 18.5 | 4 | 180M-4V1 |
| 3GCL 100×2 | 70 | 1165 | 6 | 1450 | 20 | 22 | 4 | 180L-4V1 |
| 3GCL 100×2 | 69 | 1150 | 8 | 1450 | 25 | 30 | 4 | 200L-4V1 |
| 3GCL 100×2 | 47 | 780 | 4 | 970 | 9.6 | 11 | 4 | 160L-6V1 |
| 3GCL 100×2 | 45 | 750 | 6 | 970 | 13.5 | 15 | 4 | 168L-6V1 |
| 3GCL 100×2 | 43 | 715 | 8 | 970 | 16.4 | 18.5 | 4 | 200L1-6V1 |
| 3GCL 110×2 | 96 | 1560 | 4 | 1450 | 17 | 22 | 4 | 180L-4V1 |
| 3GCL 110×2 | 94 | 1565 | 6 | 1450 | 23 | 30 | 4 | 200L-4V1 |
| 3GCL 110×2 | 92 | 1530 | 8 | 1450 | 29 | 37 | 4 | 225S-4V1 |
| 3GCL 110×2 | 63 | 1050 | 4 | 970 | 12.8 | 15 | 4 | 180L-6V1 |
| 3GCL 110×2 | 60 | 1000 | 6 | 970 | 16.7 | 18.5 | 4 | 200L1-6V1 |
| 3GCL 110×2 | 56 | 930 | 8 | 970 | 18.5 | 22 | 4 | 200L2-6V1 |