Chemical Pump - Durco Mark 3 ASME ANSI

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Flowserve’s Durco Mark 3 Pump centrifugal pumps are highly regarded as an industry workhorse for their reliability in transferring chemicals. These sealed pumps incorporate advanced technologies responsible for their outstanding hydraulic performance and minimised total cost of ownership. The Mark 3 ASME pumps are fully compliant with ASME (ANSI) B73.1 design criteria, CE marked, and conform to applicable directives such as ATEX.



Durco Mark 3 ASME ANSI

FLOW UP TO 75,666 LPM (Liters per minute)
or 4540 m3/hr

Features & Benefits

  • Reverse vane impeller preserves original performance throughout the pump’s life
  • SealSentry seal chambers with flow modifiers extend seal life
  • External micrometre allows impeller clearance adjustment in seconds
  • Large shaft and bearing components reduce shaft deflection and extend bearing life
  • Back pullout design for faster servicing without removing the casing, piping, or motor
  • Designed with four precision-machined, metal-to-metal fits for improved reliability

Available Options

Durco Mark 3 is available in various configurations and comes with a range of options to suit your specific needs. Get in touch with our experts for more information.

  • Sealing options: dynamically/mechanically sealed
  • Sealless mag drive option
  • Power frames
  • Seal chamber options
  • Shaft and sleeve options
  • Optional impeller designs: low flow, recessed, front vane – open impeller
  • Others: mounting, pump guard, coupling guard, shaft guard, baseplate
  • 30 pump sizes
  • Spare parts

Key Specifications

  • Flows to 4540 m3/h
  • Heads to 275 m
  • Pressures to 27 bar


Durco Mark 3 ASME Lo-Flo – Low Flow and High Head

  • Flows to 50 m3/h
  • Heads to 300 m
  • Pressures to 31 bar
  • Durco Mark 3 Unitized Self Primer – Suction Lift
  • Flows to 320 m3/h
  • Heads to 120 m
  • Pressures to 20 bar

Durco Mark 3 Recessed Impeller – Vortex Solids Handling

  • Flows to 455 m3/h (2,000 gpm)
  • Heads to 120 m (400 ft)
  • Pressures to 20 bar (285 psi)

Durco Mark 3 Sealmatic Pump

  • Flows to 1,680 m3/h
  • Heads to 230 m
  • Pressures to 31 bar


  • Acid transfer
  • Caustic and chlor-alkali
  • Man-made fibres
  • Polymers
  • Slurry processing
  • Solvents
  • Volatile organic compounds
  • Waste processing


With only three different power frames and five SealSentry seal chamber options, the 30 pumps in the Durco Mark 3 family offer a high degree of parts interchangeability. Pumps delivered worldwide are manufactured in ISO 9001 certified Flowserve facilities.


ANSI 3A power end designed to improve reliability, maintenance and performance. It conforms with the ASME B73.1 standard and is so advanced it carries a lifetime warranty.
Davey boasts highly dependable pumps for the commercial, residential, and infrastructural sectors.Davey boasts highly dependable pumps for the commercial, residential, and infrastructural sectors.Davey boasts highly dependable pumps for the commercial, residential, and infrastructural sectors.


With the largest shaft and bearing components available for ASME (ANSI) standard pumps, the Durco Mark 3 shaft and bearings system improves pump performance and reliability.


Durco SealSentry seal chambers extend seal life, improve pump reliability, and reduce the total cost of pump ownership.


Industrial Chemical Pumps

Fluid enters the impeller through the “eye” and is “centrifuged” (hence the name) to the impeller periphery, with assistance from the impeller vanes.
As the impeller rotates, it imparts kinetic energy onto the liquid surrounding it due to friction. The liquid moves towards the outer periphery of the impeller; its kinetic energy is then changed to pressure. The impeller has vanes separated by channels through which the liquid flows. Each channel has an increasing flow path area. As the flow path area expands, the liquid’s velocity decreases and the pressure increases. 
Due to the unique shape of the volute casing, the liquid undergoes a further velocity decrease and pressure increase. The liquid is then discharged through the discharge port.

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