Double Suction Axially Split pumps ZPP, Z22

Summary

Product identification

The ZPP and Z22 are Double Suction Axially Split Single Stage Centrifugal Pumps designed for demanding high-capacity industrial applications, ensuring process reliability, high efficiency, and low operating costs. Each series offers over 20 sizes with different impeller designs to minimize energy consumption.

Main applications include:

• Hydrocarbon processing industry
• Oil and gas
• Power generation
• Pulp and paper
• General industry
• Water and wastewater
• Chemical process industry

Operating limits

ZPP Double Suction Axially Split Single Stage Centrifugal Pump

• Pump sizes: 250 to 900 mm (10 to 35 in)
• Capacities: up to 25,000 m³/h (up to 110,000 USgpm)
• Heads: up to 160 m (up to 525 ft)
• Pressures: up to 20 bar (up to 290 psi)
• Temperatures: 120°C* (250°F*)
  • *depending on material and size

Z22 Double Suction Axially Split Single Stage Centrifugal Pump

• Pump sizes: 200 to 1,000 mm (8 to 40 in)
• Capacities: up to 17,000 m³/h (up to 75,000 USgpm)
• Heads: up to 220 m (up to 720 ft)
• Pressures: up to 25 bar (up to 362 psi)
• Temperatures: 140°C* (280°F*)
  • *depending on material and size

Feed water

These pumps are designed to handle:

• Clean and slightly contaminated liquids
• Viscous liquids
• Low-consistency fibrous slurries
• Liquids in applications with small pressure pulsations

Mechanical / hydraulic

• Impeller:
  • Double entry impeller.
  • Double suction impeller with split, staggered, and skewed vanes for high efficiency and low Net Positive Suction Head (NPSH) values.
  • Low pulsation impellers are available for stringent paper machine head box applications.
  • ZPP: Impeller installed on the shaft by strong interference fit without keyway, designed for easy hydraulic disassembly.
• Casing:
  • Axially split, heavy-duty horizontally split casing.
  • Allows inspection, maintenance, and removal of the rotating unit without disturbing piping or motor.
  • Available with single volute for lower head and double volute for higher head applications.
  • Designed for low radial loads on bearings and low shaft deflection, extending seal and bearing life.
• Casing wear rings:
  • Renewable casing wear rings protect the casing from wear and assure smooth flow, improving efficiency.
  • Easy to maintain correct clearance.
  • Wear ring locked in lower casing to prevent rotation.
• Shaft:
  • Heavy-duty shaft for high corrosion and wear resistance, plus high strength.
  • Reduced shaft deflection for extended seal and bearing life.
  • Duplex stainless steel shaft.
• Shaft sealing (Versatile):
  • Stuffing box: External or internal sealing liquid; ZPP features a split stuffing box gland and lantern ring with withdrawal grooves for easy service.
  • Mechanical seal: Different mechanical seals available; ZPP seals fit into the same chamber as packings, allowing easier change to another type of sealing.
• Bearing unit:
  • ZPP: Long lifetime with high thrust spherical roller bearings (identical on both sides); Grease or oil lubrication; Effective bearing protection by non-contact wear-free labyrinth seals and deflector; No adjustments needed for quicker assembly.
  • Z22: Long lifetime with high thrust angular contact ball bearing for axial load and deep ball bearing for radial load; Grease lubrication as standard.
• Flexible installation:
  • Single and dual drive alternatives.
  • Horizontal or vertical installation for compact setup.
  • Some Z22 sizes are available in angled execution.

Materials

The Z22 series is available in a wide range of materials.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the official OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used for the project.

Official datasheet (PDF)

Lenntech datasheet mirror