Alfa Laval three-screw pump Alfa Laval 3S pumps The 3S series is characterised by an innovative design for long service life, even in harsh operating conditions. 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 several­executions 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 •

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 lubricated and cooled. The seal is designed to efficiently dissipate frictional heat. Consequently, the 3S series is characterised by an innovative­design for long service life, even in harsh operating conditions. Technical data Materials Pump casing Nodular...

Operating limits Max. inlet pressure Mechanical sealed pump (SiC/hard metal) Magnetic coupled pumps Max. discharge pressure Max. differential pressure Valve setting pressures Adjustable Temperature range Mechanical sealed pump (SiC/hard metal) Magnetic coupled pumps Viscosity Max. rotation speed [min -1] 50 Hz 60 Hz Pump testing Every individual pump is performance tested before leaving the factory. Certification Upon request the Alfa Laval 3S pump may be certified according to the following class societies: ABS, BV, CCS, CR, DNV, GL, KR, LR, NK, PRS, RINA, RS. 1 Model (BI: Inline flange, VI:...

Notes: LG measure depending on motor specification. For other 3S variants, please ask Alfa Laval.

Dimensional drawings 3S BI 0550–2900 from frame size 225 How to contact Alfa Laval Up-to-date Alfa Laval contact details for all countries are always available on our website at www.alfalaval.com Alfa Laval reserves the right to change specifications without prior notification. ALFA LAVAL is a trademark registered and owned by Alfa Laval Corporate AB.