Marine G Series Screw Pump

Marine G – series Screw Pump

1. Transport Medium

• Liquids with various viscosities, especially thick media difficult to transfer.
• Liquids with different concentrations and dry – matter contents that are suspended and non – settled.
• Liquids containing solid particles, fibers, or suspended solids.
• Liquid – solid mixtures.
• Non – aggressive liquids that cannot be sheared, cut, or squeezed.

2. Application Fields (Part)

• Petro – industry: Crude oil transportation, heavy oil transportation, oil – gas – water multi – phase transportation, oil – water separation and recovery system, polymer transportation, various non – Newtonian fluids, various emulsions, various viscous fluids, various fluids containing solid particles, various fluids that cannot be sheared or cut.
• Chemical Industry and Pharmacy: Various chemical materials, various emulsions, various suspensions, various viscous fluids, various fluids containing solid particles, various fluids that cannot be sheared or cut.
• Environment Engineering: Sewage treatment, sludge transportation, dredging and filling, etc.
• Mineral Products Engineering: Tailings transportation, paste filling, etc.
• Food Industry: Juice, milk, vegetable protein, etc.
• Papermaking Industry: Paper pulp and black liquor transportation, chemical计量 (measurement, here “计量” might be a typo, assumed as measurement), washing and bleaching water treatment.

3. Working Principle

• Stator: The stator is made of elastic material with a special helical cavity. It has a large lead and a high tooth – height. The inner cavity is a continuous sealing cavity formed by the combination of the rotor and the stator. When the rotor rotates, the liquid is continuously sucked in and pushed out along the axial direction.
• Rotor: The rotor is a special spiral – shaped steel – bar with a large lead and high tooth – height. It rotates in the stator cavity, and the sealing cavity formed between the rotor and the stator moves axially to transport the liquid.
• Rotation Angle of Rotor: The rotation angle of the rotor.
• Central Axis of Rotor: The central axis of the rotor.

4. Work Features

• Wide application range, can transport all flowing media and non – running materials.
• Steady flow and pressure, no pulsation.
• The speed can be changed to change the flow rate, and the flow rate is proportional to the speed.
• Strong suction power, low working noise, no leakage, and no temperature rise. It can be used for measuring input.

5. Structure

• The general – purpose type is the basic design, suitable for transferring liquids with different viscosities and concentrations in all industries.
• Flow rate: 0.1m³/h – 150m³/h
• Pressure: 0.6 – 2.4MPa

Sectional Drawing

• A detailed sectional drawing is provided showing components such as:
  1. Discharge casing
  2. Coupling rod
  3. Stator
  4. Rotor
  5. Suction casing
  6. Pin spindle gimbals
  7. Intermediate shaft
  8. Crosshead gimbals
  9. Mechanical seal
  10. Mechanical seal
  11. Packing gland
  12. Packing seal
  13. Packing cover
  14. Drive shaft
  15. Rolling bearing
  16. Location bush
  17. Bearing stand
  18. Bearing cover

6. Pump Selection

• Correct selection is important for achieving the best use effect. To meet different physical or chemical properties and operating requirements of the medium, clients should provide the following data, and then our professional staff will recommend the collection:
  • Transportation medium: Name, corrosivity, abrasiveness, viscosity, solid content, working temperature.
  • Operation data: Flow or flow range, max pressure, continuous or discontinuous operation.
  • Installation Environment: Horizontal or vertical, fixed or moving, special requirements for connecting pipe lines, requirements for explosion – proof protection.

7. Model Explanation

• Series: G – series is the ordinary series, low – pressure, and compact design.
• Size: Possible sizes are 20, 25, 35, 40, 50, 60, 70, 85, 105, 135. The number indicates the nominal diameter of the rotor.
• Number of stages: Single – stage maximum pressure 0.6MPa, double – stage maximum pressure 1.2MPa.
• Type of shaft seal: Q – standard stuffing box, V – mechanical seal.
• Code: All parts of the pump are marked with the code.

8. Selection of Rotation Speed Based on Abrasion

• The table shows typical examples of the abrasiveness of the transported liquid and its influence on the selection of rotation speed. When the abrasiveness is higher, the rotation speed should be selected lower.

9. Rotation Speed Selection by Viscosity

• The table provides rotation speed selection ranges based on different liquid viscosities (1 – 1000 (cSt), 1000 – 10000 (cSt), 10000 – 100000 (cSt), >100000 (cSt)).

10. Stage Selection by Delivery Pressure

• The table shows the number of stages to be selected based on different delivery pressures and abrasiveness (slight, general, high).

11. Rubber Basic Resistance

• The table lists the resistance characteristics of different rubbers (NBR, FPM, EPDM) to various media such as water (含污水 – including sewage), plant oil, mineral oil, etc.

12. Rubber in Common Use on One – rotor Screw Pump Stator

• The table shows the adaptability of different rubbers (丁腈橡胶 – NBR, 氟橡胶 – FPM, 食品橡胶 – food – grade rubber, 乙丙橡胶 – EPDM) to various liquids such as water, plant oil, diesel oil, etc.

13. Maximum Permitted Grain Sizes and Fibre Lengths

• The table provides the maximum permitted grain sizes and fibre lengths for different pump sizes (G20, G25, etc.).

14. Performance Table for Eccentric Screw Pumps

• The table lists the performance parameters (rotation speed, flow capacity, absorbed power, motor power, gear – reducing) of different pump models (G20 – 1, G25 – 1, etc.) under different delivery branch pressures (0.3MPa, 0.6MPa, 0.8MPa, 1.2MPa).

Attention please: The description may be different with the product, please contact us for quotation.
Tag: Our other products 
Click here to send inquiry via whatsapp