Prepainted Galvanized Steel Coil/Sheet has light, beautiful and good corrosion resistance, but also can be directly processed, a variety of colors, mainly used in advertising, construction, household appliances, furniture and transportation industry.
PPGI Steel Coil Specifications
Thickness
0.11-2.5mm
Width
600 - 1250MM
Length
As require
Zinc Coating
Z30 - 275g/㎡,AZ30- 150g/㎡
Painting Coat Style
2/1, 2/2
Paint Coating Thickness
Top 8-35um,Back 3-25um
Top Paint
8-35 Micron
HRB
Soft Hard (＜60),Medium Hard (60-85), Full Hard (85-95)
Surface Treatment
Flat Surface, Matt, Embossed
ID of Coil
508/610MM
Surface Structure
Regular spangle,Minimum spangle, Zero spangle, Big spangle
Color
RAL Coil
Standard Seaworthy Export Packing
Dust-proof kraft sheet. Iron packing. Angle protective .Packing belt
Ppgi Steel Coil,Colour Coated Steel Coil,Prepainted Galvanized Steel Coil,Ppgi Colour Coated Coil GNEE (Tianjin) Multinational Trade Co.,Ltd , https://www.suppliersteel.com
Horizontal Twin Screw Pump Oil Pump
**Product Specifications of Twin Screw Pump**
- **Model No.:** 2LB
- **Trademark:** Runlink Huaiyin
- **Transport Package:** Wooden
- **Specification:** 3m³/h - 2500m³/h
- **Origin:** Huaian, Jiangsu, China
- **HS Code:** 8413604090
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**Application Fields of Twin Screw Pump**
1. **Oilfield:** Ideal for transporting various oils, sewage, sump oil, polymers, and crude oil (including oil-gas mixture transportation).
2. **Shipbuilding Industry:** Used as marine cargo oil pumps, sweeping-cabin pumps, ballast pumps, main engine lubricating oil pumps, and loading pumps.
3. **Petroleum Products Transportation & Storage:** Suitable for oil storage, wharves, loading/unloading operations, and transferring different types of oil products.
4. **Petrochemical Industry:** Efficient for pumping acids, alkalis, saline liquids, resins, pigments, inks, paints, glycerol, and paraffin.
5. **Thermal Power Plants:** Designed for heavy oil and thick oil transfer, fuel pumps, and fuel ejection systems.
6. **Food Industry:** Perfect for transporting alcohol, honey, syrup, toothpaste, milk, cream, soy, plant oil, animal oil, and wine in distilleries, food factories, and canneries.
7. **Paint Industry:** Used as barrel loading and unloading pumps for coatings and paints.
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**Key Advantages of Twin Screw Pump**
1. High self-priming capability
2. Low noise, no pulsation, and no emulsifying shear during media transport
3. High efficiency and energy savings
4. Multiple models available for specific applications
5. Capable of handling gas-liquid mixtures
6. Suitable for volatile oils at high temperatures, such as gasoline
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**Performance Parameters**
- **Flow Rate:** 3–2000 m³/h
- **Pressure:** 0–4.0 MPa
- **Temperature Range:** -20°C to 350°C
- **Viscosity Range:** 0–10,000 mm²/s (with special design, up to 1×10ⶠmm²/s)
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**Types of Twin Screw Pumps**
1. **Installation Type:** Horizontal or vertical
2. **Structure Type:** Cast or welded
3. **Heating Type:** Customizable based on the medium requirements
4. **Material Options:**
- Pump Body: Cast steel, cast iron, Stainless Steel (304, 316L), Q235 steel, etc.
- Screw Cover: Cast steel, stainless steel, 17-4PH, etc.
- Customers can choose materials based on their working conditions.
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**Structure and Working Principle**
The pump consists of a pump body, driving and driven screws, shaft seal, synchronizing gears, and a safety valve. The screw features a symmetrical rectangular thread. The synchronized gears drive the screws to rotate and move in opposite directions, drawing in the fluid from both sides and discharging it through the center outlet. A safety valve is installed on the side of the pump body, with an initial set pressure of 1.1 times the operating pressure. For pumps with flow rates below 15 m³/h, a safety valve is not required.
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**Operation Instructions and Precautions**
1. Mount the pump and motor on a solid base to prevent vibration damage and ensure smooth operation.
2. Ensure all electrical connections meet government standards.
3. General working configuration: Input screw facing right, outlet on top, rotation direction is clockwise. Contact us if other configurations are needed.
4. Install a 20-mesh filter with a flow area four times that of the pump inlet.
5. Pipe size must match the pump’s inlet and outlet; otherwise, performance will be affected.
6. Clean all pipes and filters before first use to avoid blockages.
7. Open all valves before starting the pump. Adjust as needed after normal operation.
8. Monitor vacuum value after startup. If no vacuum is achieved within one minute, stop and check.
9. When using the pump for cabin sweeping, limit operation time to 3 minutes to avoid seal damage.
10. Use 180# medium load gear oil. Regularly check oil level and temperature (not exceeding 70°C normally, 80°C for long-term operation).
11. Check and add grease to the gears regularly.
12. For closed-seal frame pumps, avoid closing other pipes if leakage occurs in the sealing area to prevent bearing damage.
13. For high-flow and high-pressure pumps, water cooling may be required. Cooling water flow should be around 2 m³/h.
14. Use a heating system when transporting high-viscosity media.
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**Common Issues and Solutions**
1. **Pump Cannot Prime or Displacement Not Matching Rating**
- Possible cause: Leaking pipe, leading to poor vacuum formation.
→ Check and tighten bolts or replace washers.
- Wear between the screw and pump body over time.
→ Replace worn parts.
- Excessive vacuum at the inlet causing vibration.
→ Check for clogged filters or pipes.
- Damaged shaft seal allowing air into the pump.
→ Replace the damaged seal.
- Safety valve not functioning properly.
→ Adjust or replace the spring.
- Impurities inside the safety valve.
→ Clean the valve to restore sealing.
2. **Unusual Noise, Smoke, or Pump Stopping with High Bearing and Gear Temperatures**
- Damaged bearings causing screws to hit the pump body.
→ Replace the bearings.
- Lack of oil or damaged bearings causing pump failure.
→ Add oil or replace bearings.
- Foreign objects entering the pump cavity.
→ Clean the cavity and repair.
- Insufficient or contaminated gear oil.
→ Add or replace oil.
- Damaged gears due to lack of lubrication.
→ Replace gears and adjust screw gap to prevent collision.
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**Assembly and Disassembly of Twin Screw Pump**
**Disassembly of the Pump Input Axle End**
- Remove the coupling and key.
- Take off the shaft cups from both ends.
- Remove the bearings and retaining washers.
- Use the four screw holes on the bracket to retract it.
- Carefully remove the bearing, ensuring the adjusting washer is not misplaced.
- Check the seal and bearings for damage and replace if necessary.
- Pull out the screw for inspection unless the pump cavity is clean.
**Reassembly of the Pump Input Axle End**
- Reinstall the bracket and insert the locating pin tightly.
- Place the adjusting washer back, replacing the oil seal if damaged.
- Assemble the bearing, retaining washer, and nut using a dedicated sleeve tool.
- Reattach the two bearing-end shaft cups.
**Disassembly of the Gearbox End**
- Remove the gearbox.
- Take off the gear compression nut and retaining washer, noting the direction.
- Follow the same steps as above for the remaining components.
**Reassembly of the Gearbox End**
- Reassemble the gear, retaining washer, and compression nut in the correct position.
- Install the gearbox and fill with gear oil.
- Test the screw rotation for smoothness. If everything is fine, reattach the coupling.