D MARK III · ANSI / ASME B73.1
Durco Mark III replacement pumps and parts—reviewed before quotation
Send the installed pump size, OEM reference, drawing, or nameplate image. Our engineering team checks the requested configuration, materials, and documentation requirements before we quote.
ANSI / ASME B73.1
Dimensional review before supply
GROUP I–III
Documented Mark III family coverage
Material selection
Matched to medium and duty
Inspection records
Defined before quotation
ENGINEERING-FIRST REPLACEMENT
Start with the installed pump—not a generic model name
A Mark III replacement is not confirmed by the series name alone. Pump group, size, impeller trim, seal chamber, materials, shaft and sleeve arrangement, and process conditions can all affect fit and service life. We use the installed-pump information to establish the replacement scope before quotation.
What to send for a faster review
- Pump group and size, nameplate photo, or OEM part number
- Medium, temperature, pressure, duty point, and material requirement
- Drawing, sample dimensions, or installation photos when details are unclear
CROSS-REFERENCE REVIEW PROCESS
A replacement scope built around the actual installation
01 · Identify
We review the nameplate, group, size, OEM reference, or available drawing to establish the installed configuration.
02 · Confirm fit
Key hydraulic, dimensional, material and sealing requirements are checked against the duty and installed equipment.
03 · Define supply
We confirm whether the request is a complete pump, wet-end, power-end, or specific replacement parts.
04 · Quote clearly
The quotation can define the requested materials, documents, inspection needs and any points still requiring approval.
This process is designed to reduce the risk of ordering from an incomplete series reference or a part number that does not capture the installed arrangement.
PUBLISHED PRODUCT ENVELOPE
D Mark III operating range
The values below describe the published product envelope. Final hydraulic selection, metallurgy, seal arrangement, and motor requirements are confirmed against the application.
7,500 GPM
Up to 1,700 m³/h flow
990 ft
Up to 300 m head
400 psi
Up to 27 bar pressure
−73°C to 370°C
−100°F to 700°F
SELECT BY PUMP GROUP
Coverage built around the Mark III family
Use the group as a starting point; the exact size, trim, materials and seal arrangement are confirmed before supply.
Group I
Compact-frame applications, including sizes from 1K 1.5×1 LF-4 through 1K 3×2-8.
Confirm impeller trim, shaft arrangement and seal option.
Group II
Medium-frame applications, including sizes from 2K 3×2-8 through 2K 6×4-13A.
Review wet-end and power-end components as a matched scope.
Group III
Large-frame applications, including sizes from 3K 8×6-14A through 3K 10×8-17.
Drawings or measurements speed review of larger components.
PARTS AND CONFIGURATION
Match the components that determine fit
The documented replacement scope can include casings, impellers, rear cover plates, bearing housings, adapters, feet, shafts, sleeves, glands, seals, oil seals and related hardware. A complete replacement and a parts-only scope are reviewed differently.
Materials reviewed for the duty
- CF8M, CD4M, CN7M / Alloy 20 and WCB where applicable
- Hastelloy B/C, Nickel, Titanium and Zirconium options
- Material selection considered against media, concentration, temperature and operating history
MANUFACTURE, INSPECTION & DOCUMENTATION
Make replacement suitability verifiable
The replacement scope is supported by a manufacturing route that includes casting, machining, inspection and packing. Define documentation before the quotation is released so the delivered scope matches your project or maintenance requirement.
- Casting, CNC machining, milling, grinding and dynamic balancing
- Pressure tests for casings and fit checks for specified components
- Material certificates, inspection reports or dimensional records when required
- Non-fumigation wooden cases for export packing
REPLACEMENT SCOPE
Compatible replacement starts with confirmation—not assumption
A series name, part number or photo may be enough to start a review, but it is not automatic approval for every duty point. Hydraulic performance, metallurgy, sealing, tolerances, dimensions and documentation requirements are confirmed against the actual application.
Durco is a trademark of its respective owner. ANSI Pumps Pro supplies replacement and compatible solutions; no affiliation with or endorsement by the trademark owner is implied.
ENGINEERING FAQ
Questions before you request a quote
Can you supply a complete Durco Mark III replacement pump?
Yes. Share the duty point and installed-pump information so the complete configuration can be reviewed before quotation.
Which Mark III groups are covered?
The documented scope covers Groups I, II and III. The exact size and configuration must be confirmed for the installed pump.
What information is most useful for a cross-reference?
A nameplate photograph, group and size, OEM number, drawing, material requirement, duty point and seal arrangement give engineering the strongest starting point.
Can you match special materials and documentation?
The scope can be reviewed for stainless, duplex, Alloy 20, high-nickel alloys, Titanium and Zirconium. Specify documentation such as material certificates or inspection reports before quotation.
Is a model name alone enough to guarantee interchangeability?
No. The series name identifies the family, but final suitability depends on the actual hydraulic, dimensional, materials and seal configuration.
REQUEST A CROSS-REFERENCE
Start your documented Mark III replacement review
Send the pump group and size, OEM reference, nameplate photograph, drawing, material requirement and operating conditions. We will confirm the requested configuration, identify any missing details, and define the quotation and documentation scope.