ZW Horizontal Split Case Pump

Horizontal, axially split case pump (BB1)

ZW pump - horizontal, single stage, split case pump
ZW pump - horizontal, single stage, split case pump
ZW pump - horizontal, single stage, split case pump sectional
The ZW pump is a horizontal, single stage, axially split case centrifugal pump designed and built acording to the Hydraulic Institute (HI) standard (BB1 type). It is part of the HS/ZW range of split case pumps by Ruhrpumpen which includes the: HSC, HSD, HSL, HSR, and HSM models.

Operation limits

Capacity up to 9,000 m³/h (34,400 gpm)
Head up to 340 m (1,115 ft)
Maximum Pressure up to 98 bar (1,421 psi)
Temperature up to 120 °C (248 °F)
Applications Petrochemical, general industry applications, power generation plants, municipal water systems, mining operations, fire protection service.



Horizontal, between bearings, single stage, axially split centrifugal pump. Its innovative design allows a more compact installation and ensures perfect alignment.

  • Hydraulic Institute (HI) design - BB1 type*
  • High efficiency, foot mounted design
  • Axially split case, single- and double- volute design minimizes thrust loads and allows operation in a wide range of capacities
  • Flanged connections
  • Side-side nozzle configuration
  • Double suction, enclosed impellers provide hydraulic balance eliminating axial thrust
  • Clockwise or counterclockwise rotation
  • Grease or oil lubricated bearings
  • Stuffing box configured for packing or mechanical seal
  • Renewable wear rings
  • Horizontal or vertical mounting arrangements are available

*For API build, check the ZM pump range

  • Cast iron

Other materials available upon request

Pump for safe drinking water

The ZW is NSF ANSI 61/372 compliant and adheres to the latest lead-free requirements of the U.S. Safe Drinking Water Act.

Pumping of pure, raw and wastewater, as well as seawater:

  • Cooling towers
  • Circulating water
  • Raw water transfer
  • High and low water lift
  • Water pipelines
  • Dewatering
  • Irrigation
  • Desalination
  • Cargo loading and unloading
  • Fire protection systems (See split case fire pump)

Pump Performance Chart

Pump curve for RP's axially split case pumps: HSC, HSD, HSL, HSR, HSM, ZW

Ruhrpumpen axially split case pumps performance chart