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Self Priming Centrifugal (SP Series)

  • Overview
  • Features & Benefits
  • Specifications
  • Other Info
  • Case Studies


The Finish Thomson SP Series is a range of leak-free magnetic drive, self-priming centrifugal pumps. They combine fast, reliable and powerful performance with corrosion-resistant materials that withstand the rigours of the most demanding applications. SP self-priming pumps combine deep lift capabilities - dry lift priming up to 7.6 metres - and fast priming - 5.5 metres in 90 seconds.

The series consists of 4 models with a maximum flow rate of 45 m³/hr and a maximum differential head to 38 m. SP pumps are suitable for transferring fluids with viscosities up to 150 cP, such as sulphuric acid, phosphoric acid and sodium and potassium hydroxide. Maximum operating temperatures are 82°C for the polypropylene version and 104°C for the PVDF version. SP models are designed for a maximum working pressure of 6.2 bar.  ATEX versions are available for pumping flammable liquids or for installation in areas with explosive atmospheres.

SP pumps benefit from magnetic drive technology, meaning no seals to replace and zero leakage. All models have Neodymium-Iron-Boron inner magnets, the most powerful and efficient available, completely encapsulated in unfilled polypropylene or PVDF for superior magnet protection. The outer drive allows measurement-free drive installation for perfect magnet alignment, permitting maximum power transmission.  The SP series pump casing retains fluid for re-priming when not running thereby negatinh the need for any check valve.

A wide variety of optional components and materials are available to suit your application. When fitted with chemical grade carbon bushing, SP pumps can be run dry for extended periods without damage. The temperature of the shaft remains cool during dry-run conditions, allowing fluid to be admitted without waiting for the shaft to cool. Shafts are available in high purity alumina ceramic, Hastelloy® C, or SiC.

SP Series pumps can be mounted to NEMA and IEC motor frames while NPT or BSP threads, adjustable flanges or union connections make it easy to connect to most process systems, reducing installation cost and time.  For environments lacking a traditional source of electricity, a gas engine option, using a commercial Honda gas engine, is available. All models have a close coupled, back pullout architecture allowing straightforward installation and rapid dismantling and re-assembly.

Typical industrial uses include sump emptying, transferring from underground storage tanks and tanker trucks, pumping in systems that are liable to have trapped or entrained air, or in process systems where run-dry protection is needed.

All pumps in the range come with a 5-year manufacturer’s warranty

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