CPO ANSI Process Pump

ANSI / ASME B73.1 Process Pump

CPO Chemical Process Pump by Ruhrpumpen
CPO Chemical Process Pump by Ruhrpumpen
CPO Chemical Process Pump by Ruhrpumpen
CPO Chemical Process Pump by Ruhrpumpen
CPO Chemical Process Pump by Ruhrpumpen
This rugged process pump is ANSI / ASME B73.1 compliant and operates even in the toughest industrial and chemical applications. Its highly-engineered Power Frame is 100% interchangeable with competitor pump brands.

Operation Limits

Capacity up to 7,000 gpm (1,590 m³/h)
Head up to 650 ft (198 m)
Maximum Pressure up to 375 psi (26 bar)
Temperature up to 700 °F (371 °C)
Discharge flanges 1'' to 8''
Applications petrochemical, oil & gas, steel industry, automotive, agriculture, tank farms, pulp and paper, chemical, semiconductor, food processing, power generation, pharmaceuticals, water treatment, pipeline, general industries, textile, mining...


With 31 hydraulics, this open impeller design covers a wide range of service conditions (including low-flow region with our CPO-L model) while providing industry-leading low NPSHR performance and high efficiencies. The CPO pump is designed around a modular concept which allows provision of multiple hydraulics with a small number of power frames. In addition, these power frames are completely interchangeable with models of other common ANSI pump manufacturers.

  • Designed to meet your most difficult applications with a state-of-the-art open impeller, CD4MCu wetted parts as standard and a heavy-duty Power Frame
  • Open impeller design allows handling of solids in suspension. The impellers are locked onto the shaft by threads and sealed with an O-ring. Hydraulic profile specially designed for industry-leading NPSH performance and high efficiencies
  • Pre-loaded, double row, angular contact thrust bearings minimize axial shaft end-play thus maximizing mechanical seal life
  • Single piece casted power frame provides easier assembly and increased mechanical seal life
  • A robust solid shaft with outstanding L3/ D4 for low vibration and increased mechanical seal life (shaft sleeves are available as an option)
  • Machined flat surface suitable for use with magnetic mount vibration probe
  • Standard seal chambers designed to accommodate all seal arrangements and flush plans per ANSI/ASME B73.1 with plan 11 as standard
  • Labyrinth type Bearing Isolator, to ensure bearings free from contaminants
  • Lubrication:
    • Oil bath lubrication as standard, with option for grease and oil mist lubrication
    • Large capacity oil sump and finned housing provide superior cooling and environment for bearings
  • Axial impeller adjustment without the need for special tools
  • Baseplate mounting systems
  • Sealing
    • Large taper bore with flow modifiers
    • Standard large and small bore
  • Cooling coil to maintain proper oil temperature in hot applications


Materials in stock:

  • DI / SST
  • DI / Duplex
  • SST / SST
  • Duplex / Duplex

Special materials:

  • Alloy 20
  • Hastelloy B and C
  • Zirconium
  • Titanium

Other materials on request

CPO-L for low flow, high head applications

CPO-L Low Flow ANSI Process Pump

Designed to fill the gap on the low flow side of the CPO range map, the CPO-L counts with a radial vane impeller especially designed to reduce the thrust load and seal chamber pressure normally associated with low flow applications. It also complies with the ANSI/ASME B73.1 standard.

With low flow applications, it is important to reduce the radial load and potential shaft deflection issues. Ruhrpumpen’s radial vane impeller and concentric pump casing for the CPO-L are specifically designed to reduce these issues at low flow or throttled operating conditions. The radial vane impeller with balance holes also reduces seal chamber pressures. This will lead to increased seal and bearing life and increased reliability.