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Mark 3 Group 4 High-Capacity Chemical Process Pump

Durco Mark 3 Group 4 High-Capacity, Metallic, ASME (ANSI) Chemical Process Pump

BRAND: Durco

The all new Durco Mark 3 Group 4 pump offers increased capacity with proven Durco performance and reliability along with ASME B73.1 design features. Offering flow rates to 3861 m3/h (17 000 US gpm) — well beyond ASME size limits — the Durco Mark 3 Group 4 is ideal for high-flow, high-head applications in the chemical processing and general industries.


  • General Industry
  • Chemicals
  • Water

industry sectors

  • Corn Wet Milling & Ethanol
  • Other Industries
  • Basic (Organic & Inorganic)
  • Specialty (Fine & Consumer)
  • Biofuels
  • Waste Water

Single stage, overhung, centrifugal pump designed to ASME B73.1 Standards. Hydraulic performance, NPSH and vibration testing per Hydraulic Institute (HI) standards.  CE/ATEX Conformance.

Operating Parameters

• Flows to 3861 m3/h (17 000 gpm)
• Heads to 125 m (410 ft)
• Discharge pressures to 19 bar (275 psi)
• Temperatures from -73°C to 204°C (-100°F to 400°F); ductile iron: -29°C to 204°C (-20°F to 400°F)

Design Range

The expanded hydraulic range of the Durco Mark 3 Group 4 comprises 13 sizes on two bearing frame platforms:


  • 41K12x10-16
  • 41K14x14-16
  • 41K8x4-19
  • 41K8x6-19
  • 41K10x6-19
  • 41K12x10-19
  • 41K14x12-19
  • 42K10x8-19
  • 42K16x16-19
  • 42K12x8-22
  • 42K12x10-22
  • 42K14x12-22
  • 42K16x14-22
Features & Benefits

-Reverse vane impeller is the only impeller design that offers repeatable pump performance throughout the life of the pump. Open impellers available.
-Durco SealSentry seal chambers feature flow modifiers that extend seal life by providing optimal seal chamber environments.
-Standard sealed bearing housing with labyrinth bearing isolators to keep lubricant in and contaminants out.
-Two-piece power end design with self-contained bearing housing reduces maintenance costs and facilitates predictive maintenance.
-Heavy-duty radial and thrust bearings are selected for long life and reliability.
-External micrometer impeller adjustment accurately sets impeller clearance in 20 seconds, simplifying maintenance.
-Rugged shaft and bearing design extends seal life, bearing life and reduces shaft deflection and vibration.


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