Marine SPF Series Three Spindle Screw Pump

Marine SPF Series Three-Spindle Screw Pump

1. Uses

• Suitable for conveying lubricating oils, hydraulic oils, oil-based or other lubricating liquids. The conveyed medium must not contain any abrasive particles that chemically attack the pump materials.

2. Application Range

• SPF series three-spindle screw pumps are used in fuel systems for transfer, booster, and burner operation; in fuel oil engineering for transfer and filling; in industrial sectors for transfer and filling of lubricating oils in tanks; and can also be used for generating hydraulic pressure in oil hydraulic plants at all kinds.

3. Structure

• The SPF series pump is an internal-bearing self-priming three-spindle screw pump with hardened and ground screws. The hardened and ground screws run in an exchangeable casing insert. The pump screws are hydraulically balanced. The axial thrust of the working screws is absorbed by the end side screw cover; their drive is hydraulic. The threaded flanks merely transmit the torque resulting from the liquid friction. Thus, the threaded flanks are practically stress-free and not subject to any wear. All. All parts in contact with the liquid are lubricated.
• The radial and axial bearing of the driving screw is by the balancing piston guided in the bearing ring. Simultaneously, the gap between balancing piston and bearing ring separates the pressure chamber from the sealing chamber. A maintenance-free mechanical seal is provided at the shaft sealing. Sealing chamber and suction chamber are interconnected by way of a return bore, so that the delivery pressure at the shaft sealing is only slightly above suction pressure. Only under unbalanced conditions (e.g., dry running) does a complete unit with a pressure-tight housing, connection pump/driving motor is by a pump connector with bracket (sizes 20) or by a wall-foot/bracket mount (size 40).

4. Rotation

• By a special profiling of the thread flanks, the three screws from sawn-tooth casing form the conveying chambers, which are available completely continuously shifted from the suction to the pressure side of the pump as the screws turn. There will be no turbulence in spite of step-less rotation. The constant chamber volume excludes squeezing.

5. Noise and Pulsation

• The special design and production of the screw pump ensure a very low noise level and almost pulsation-free delivery.

6. Shaft Sealing

• By means of a maintenance-free mechanical seal of the unbalanced type.

7. Temperature and Pressure Limits

• Permissible temperature: 150°C
• Admissible delivery pressure: up to 4.0MPa
• Admissible suction pressure: 1.0MPa

8. Pressure Relief Valve

• As an overload protection, installed in each pump is a pressure relief valve.

9. Flanges/Connections

• SPF type three-screw pumps may be mounted in any position. For safety purposes, the arrangement with motor downwards is not permitted.

10. Driving/Coupling

• By way of an intermediate connector, electric motors of the most varied designs or other prime movers can be connected with the pump normally. Usually, the following are provided: Surface-cooled three-phase cage motors, enclosure IP44 according to IEC Standards, Class F insulation, performances and main dimensions according to DIN/EN series.
• Rotors rated for 50Hz can also be operated from 60Hz supply systems without any change.

11. Installation

• Various types of motors or other driving devices are connected through couplings and pump for connection.
• Three-phase AC motors, their protection grade is IP44, insulation grade is B, and main efficiency is according to relevant standards.
• The motor额定（应为“rated” ，此处原文可能有误） speed is 50Hz, and it can also be used under 60Hz power supply without any change.

Model Code

SPF – 20 – R – 46 – G – 10 – F – W3

1. Series/Type
2. Size/Specification
3. Hand of Rotation (R = Right/L = Left/CCW)
4. Pitch Angle (degree) (Implicit in model, not explicitly numbered in original but included in code structure)
5. Connection Type/Form of Delivery Chamber (G in code, specific meaning as per product design)
6. Nominal Pressure or Other Parameter (10 in code, specific meaning as per product design)
7. Shaft Seal Type or Other Feature (F in code, specific meaning as per product design)
8. Material Code/Material Code (W3 in code)

NPSH Table

Performance Data Tables for SPF20 and SPF40 (for size 20 and size 40 respectively)

These tables provide detailed performance data including rotational speed (r/min), flow rate (m³/h), delivery head (m), efficiency (%), required NPSH (m), and power (kW) under different conditions. The data is extensive and covers a wide range of operating parameters for each size of the pump. For example, for SPF20, data is provided for different speeds from 20-38 r/min up to 1750 r/min, and for SPF40, similar data is presented for various speeds as well. Each table has multiple columns and rows with specific numerical values for the mentioned parameters.

Attention please: The description may be different with the product, please contact us for quotation.
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