Chemical Pump - Durco Mark 3 ASME ANSI

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.

Features & Benefits

Know more about the features & benefits of using Chemical Pump - Durco Mark 3 ASME ANSI.

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

Here are the key specifications of Chemical Pump - Durco Mark 3 ASME ANSI.

Flows to 1700 m3/h
Heads to 300 m
Pressures to 27 bar
Temperature range from -73°C to 370°C
Discharge sizes from 25 to 200 mm

Applications

Here is a list of industrial applications for which Chemical Pump - Durco Mark 3 ASME ANSI are commonly utilized.

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

INTERCHANGEABILITY

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.

POWER ENDS

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.

UNRIVALED SHAFT AND BEARING DESIGN

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.

ADVANCED SEAL CHAMBER TECHNOLOGY

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

Our Available Product Range for Durco Mark 3 ASME ANSI

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.

Durco Mark 3 ASME ANSI Brochure

Talk to Experts

DURCO MARK 3 L-FLO PUMPS

Engineered to ASME (ANSI) B73.1 standards, the Durco Mark 3 Lo-Flo delivers superior reliability in low-flow, high-head applications. Featuring Flowserve’s patented radial vane impeller and concentric casing, it minimises radial loads and shaft vibration—extending bearing and seal life.

Flows to 50 m3/h
Heads to 300 m
Pressures to 31 bar
Temperatures from -75°C to 370°C

DURCO MARK 3 SEALMATIC PUMPS

No mechanical seal required. Durco Mark 3 Sealmatic pump’s dynamic sealing repeller expels fluid from the seal chamber, making it ideal for tough sealing applications—without external flush or contamination risk. ASME (ANSI) B73.1 compliant.

Flows to 1,680 m3/h
Heads to 230 m
Pressures to 31 bar
Temperatures from -75°C to 370°C

DURCO MARK 3 UNITISED SELF-PRIMING PUMPS

The Durco Mark 3 Unitised self-priming pump primes without external pressure and is designed to lift liquids from below ground. Installed at ground level, it offers easier, more cost-effective installation and maintenance than submersible pumps.

Flows to 320 m3/h
Heads to 120 m
Pressures to 20 bar
Temperatures to 370°C
Static suction lift to 6 m

DURCO MARK 3 RECESSED IMPELLER PUMPS

Combining ANSI-standard design with vortex flow, the Durco Mark 3 Recessed Impeller Pump easily handles solids and fibrous slurries. Thick-wall wet-end components extend pump and seal life.

Flows to 455 m3/h
Heads to 120 m
Pressures to 20 bar
Temperatures from -75°C to 370°C