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Alfa Laval three-screw pump

From:Alfa Laval | author:Mr.Chen | Time :2026-11-07 | 19 view: | 🔊 Click to read aloud ❚❚ ▶ | Share:

The thoroughly engineered 3S series is suitable for various

applications. With a range consisting of 29 different pump

sizes with delivery rates from 5–2.900 l/min@1450 rpm the

3S series is one of the most comprehensive three-screw

pump ranges available on the market.

Furthermore, the individual pump sizes are available in

several executions ensuring a high degree of flexibility

when specifying a pump for specific system designs.

Applications

The 3S series consists of a broad range of pump

sizes for lubricating, non-abrasive oil based liquids.

3S pumps are used in marine and industrial applications.

Examples are:

• Feed and circulation pumps for fuels and lubricants

• Lubricant and coolant pumps for gears, engines and

hydraulic systems

• Feed and transfer pumps for oil burner technology

Benefits

Key benefits significant to the 3S pump design are:

• Minimized life cycle cost

• Low maintenance

• High quality

• Environmentally friendly

• High volumetric efficiency

• High energy efficiency

Design

The 3S series pump is designed with a lifetime-lubricated

external ball bearing with an expected lifetime of 30.000

hours. With a weep hole just between the shaft seal and

the bearing, preventing accumulation of residue, the

bearing is well protected. The ball bearing is not exposed

to the pumped liquid. The mechanical seal is well lubri

cated and cooled. The seal is designed to efficiently

dissipate frictional heat. Consequently, the 3S series is

characterised by an innovative design for long service life,

even in harsh operating conditions.

Port connections

Flanges PN16 according to EN 1092-1 type B1/B2. in inline

configuration or at the top. For 3S BT and 3S VT special

counter flanges are required. A special flange design is used

with 3S BS pumps.

Motors

According to the IEC metric standard:

• 2 poles = 2.900/3.500 rpm at 50/60 Hz

• 4 poles = 1.450/1.750 rpm at 50/60 Hz

• 6 poles = 950/1.200 rpm at 50/60 Hz

• IP55. insulation class ICLF, efficiency class IE2


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