Main benefits
  • Centerline mounting to allow free thermal expansion and high nozzle loads
  • Minimum bearing span to minimize shaft deflection
  • Single cover casing design to reduce overhaul times
  • Chrome steel casing with good corrosion resistance and excellent mechanical properties is standard; other materials available 
  • Single mechanical seal provides higher efficiency
Main applications
  • Booster pumps for large boiler feed water units in thermal and nuclear power stations
  • Safety-related pumps in nuclear power stations
Main design features
  • Double suction impeller with staggered vanes for low Net Positive Suction Head required (NPSHR) and low-pressure pulsations
  • Different nozzle positions are possible
  • Amply sized sleeve radial and tilting pad bearings with forced lubrication as standard
  • Optional self-contained oil lubricated bearings
  • Stiff shaft ensures that critical speed is a minimum of 20 % above the maximum operating speed
  • Mechanical seal jacket cooling
Key characteristics
Capacities Up to 5,500 m3/h / 29,000 US gpm
Heads Up to 340 m / 1,115 ft
Pressures Up to 48 bar / 700 psi
Temperatures Up to 220°C / 428°F
Discharge sizes Up to 400 mm / 16 inches
Performance range
HZB performance range 50 Hz
Performance range 50 Hz
HZB performance range 60 Hz
Performance range 60 Hz
  • Boiler feed water and booster pumps
    Feed water pumps (FWP) pump the feed water from the de-aerator through the HP heaters to the boiler. The major characteristic of FWP is their high differential head.

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