Bungartz Special Centrifugal Pump

 LOW NPSH CENTRIFUGAL PUMP

Bungartz pumps solve problems when dealing with

 

 

  • shaft seals

  • poor feed conditions

  • challenging pumping media

  • gas containing liquids

  • liquids close to boiling point

  • corrosive and / or abrasive pumping media

  • sophisticated plant technology

      Bungartz solutions are as diverse as the challenges. Using the example of a horizontal pump with packed gland, the various designs of the pump casing and impeller are shown here. They apply for a large number of pumps in the Bungartz product range.

MOS / UMOS.

  • Basic design with cylindrical packed gland

  • Implementable in all stainless steel casting grades

  • For low (MOS) and high (UMOS) suction heads

F-MOS / F-UMOS.

  • With torque flow impeller

  • Utilisable with larger solid grain sizes

M-MOS / M-UMOS.

  • With additional wear protection

    (wear plates and components made from SiC)

  • For abrasive media

SK-MOS / SK-UMOS.

  • Welded construction made of special materials

    such as titanium and zirconium

P-SI-MOS / P-SI-UMOS.

  • Special design with additional cast armour plating

    when using cast silicon iron

THE HYDRODYNAMIC SHAFT SEAL

 

      The hydrodynamic shaft seal is an almost forgotten but very effective principle. It is eminently suitable for operation with liquids loaded with solid material. The hydrodynamically sealed pump has an impeller with back vanes and additionally, depending on the suction head, a high performance seal expeller. This sets an equal pressure opposing the residual or pumping pressure. Almost all Bungartz pumps combine the hydrodynamic shaft seal as a primary seal with a downstream, depressurised secondary sealing (packed gland, lip seal, mechanical seal or magnetic drive).

Pump in idle state.

  • liquid in contact with the shaft seal (secondary sealing)

  • selected secondary seal (packed gland, lip seal, mechanical seal, magnetic drive) ensures idle state sealing

Pump rotating.

  • no liquid is in contact with the secondary sealing

  • the primary sealing operates hydrodynamically

  • back vanes fully relieve feed and pumping pressure

  • the secondary sealing can be selected depending on the particular application

  • the secondary sealing has optimum protection

Primary shaft seal- Hydrodynamic Shaft Seal

  • Impeller back vanes keep the fluid away from the shaft seal  during operation- high reliability

  • No components subject to wear – long lifetime of shaft seal

  • Can be used in horizontal and vertical pumps

  • During operation there is no shaft seal required at all (no packing, no mechanical seal) – high reliability

Secondary shaft seal

  • The conventional shaft seal becomes a back up seal only, possible seal types are : Packing, mechanical seal, lip seal, watering seal, magnetic drive……

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