Cavern Pump Units

Manufactured to customer specification, Pleuger cavern pump units available as single-stage or multi-stage centrifugal pumps, typically coupled with water-filled motors as standard, or oil-filled motors for special applications. The motor is assembled below the pump and the suction area is located above the motor. The power supply cable is contained in a water-filled protection pipe (water-filled motors with ATEX-certificate) or for oil-filled motors, a special armoured cable is connected to the motor. The pumps are designed to ensure safe operation in explosive atmospheres.


  • Pumps with flanged bowl designs (starting from 6“ / P, Q, K, S – series)
  • Pumps with tie-rod designs (6” – 8” / N – series)
  • Pumps with radial, semi-axial and axial-design hydraulics
  • Individual customization to duty point requirements
  • Non-return valves and non-return-flaps in different connection sizes and designs
  • Rewindable motors from 6″ motor size and bigger
  • Synchronous (Permanent Magnet Motors) and asynchronous induction motors
  • As standard design water-filled motors
  • Oil-filled motors for special applications
  • Internal volume and pressure compensating motor design
  • Improved internal cooling system for 10” motor size and bigger
  • Units for vertical and inclined applications
  • Multiple materials available
  • Pumps and motors for special applications
    • Twin-shaft motors
    • Motors with additional/external cooling systems
    • Motors for explosive atmosphere applications 
    • Motors for special voltage requirements
    • Motors according to customer specifications
    • Units for turbine operation and energy recuperation
    • Units for hot water applications

Available designs

  • Cavern pump units (for explosive atmosphere applications)


  • Engineered and manufactured in-house to ensure end-to-end quality and assurance
  • Worldwide operating service network
  • Versatile product sizes and designs for almost all application areas
  • Maintenance-free
  • Internal volume and pressure compensating motor design for high operational safety and reliability in extreme installation depths
  • Minimal noise emission
  • Protected against vandalism
  • Flood-proof (IP68) and frost-proof
  • Environmentally friendly
  • Easy installation without complex adjustment or alignment work


  • Mining (dewatering and water supply)
  • Process pumps
  • Crude oil export pump
  • Pumping of refinery products like diesel, gasoline and liquid gases like LPG (Propane, Butane) and LNG 
  • Cavern storage of crude oil and refinery products
  • Leak water pumps for caverns
  • Offshore und onshore

Technical Details

  • Discharge flow: 5 m³/h – 4500 m³/h (22 – 19,813 USGPM)
  • Discharge head: 7 m – 700 m (23 ft – 2,297 ft) 
  • Non-return valves with DIN or ANSI/ASME flange connections
  • Non-return valves with DIN or NPT flange connections
  • Motors from 6” to 50” with rewindable design
  • Water-filled motors as standard, or oil-filled motors for special applications: 0.37 kW – 5 MW (0.5 HP to 6,700 HP)
  • Water-filled synchronous motors (Permanent Magnet Motors): 5 kW – 200 kW (6.7 to 268 HP)
  • Voltage range: 230 V – 6.6 kV (11kV on request)
  • 2-pole to 12-pole motor designs for 50 Hz and 60 Hz
  • Multiple materials available
  • Pump impellers in PPE plastic, bronze, stainless steel or Super Duplex
  • Pump bowls in cast iron, bronze, stainless steel or Super Duplex



Design Standards: NSF, API, ANSI, ASTM, EN, ISO, DIN, NORSOK, Customer specific
Hydraulic Standards: API, ANSI/HI, EN, ISO, NFPA 20
Electrical Standards: EC, IEEE, NEMA