Durco Mark III Replacement Pump Solutions
A documented ANSI process pump and parts range for installed Durco Mark III applications, reviewed by group, size, duty, material, and interface.
Product overview
D Mark III coverage is organized by Group I, II, and III configurations. Provide the installed group, pump size, nameplate, OEM part number, drawing, or sample component so the replacement basis can be checked.
- Reverse-vane impeller design
- CBS, CBL, FMS, and FML seal chamber options
- External impeller adjustment
- Bronze or stainless-steel labyrinth bearing isolators
- Replacement coverage for selected Mark III components
OEM interchangeability is reviewed, not assumed
Durco and Mark III references identify the installed equipment and requested comparison. Final fit and suitability require review of group, size, casing, cover, impeller, shaft, bearing frame, seal chamber, nozzle orientation, baseplate, material, speed, and duty.
Technical specification
| Parameter | Published or project basis |
|---|---|
| Maximum published capacity | 7,500 US gpm / 1,700 m³/h |
| Maximum published head | 990 ft / 300 m |
| Maximum published temperature | -100°F to 700°F / -73°C to 370°C |
| Maximum published pressure | 400 psi / 27 bar |
| Group coverage | Group I, Group II, and Group III |
Material options
- Stainless steel options
- Duplex stainless steel options
- Alloy 20 and Nickel options
- Hastelloy options for reviewed services
- Titanium options for reviewed services
Application review
- Chemical process duties
- Refinery and hydrocarbon services
- Pulp and paper process streams
- Water and industrial utility service
- Corrosive or erosive services after material review
Datasheet and RFQ inputs
Existing technical resources
Files are served from the current ANSI Pumps Pro production media library.
ANSI Pumps Brochure PDFPerformance Curves PDFInclude with the request
Send confirmed facts and identify unknowns.
- Pump manufacturer, model, size, group, and serial number
- Flow, total dynamic head, speed, fluid, temperature, and solids
- Material, impeller diameter, seal chamber, and mechanical seal details
- Nameplate photos, parts list, drawings, or failed sample dimensions
- Motor, coupling, nozzle, baseplate, and installation constraints
Frequently asked questions
Can fit be confirmed from the model name alone?
No. The review also requires the exact size or group, configuration, materials, interfaces, and available dimensional evidence.
Can an existing OEM part number be used?
Yes. Provide the complete number and any drawing, bill of materials, nameplate, or photograph available. The number is a starting point for cross-reference review.
How are material options selected?
Material review considers fluid chemistry, concentration, temperature, pressure, solids, corrosion history, and the applicable component.
When is a curve or datasheet issued?
The documentation basis is defined after the duty point and proposed pump configuration are reviewed. Project-specific documents are included when stated in the quotation scope.
Send the model, duty point, or drawing
Provide the available pump identity, operating conditions, materials, and interface data so the replacement scope can be reviewed before quotation.
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