Confirm the Group 2 Pump Before Selecting a Casing
A Group 2 casing should be verified from the installed pump size and configuration before quotation. Use the nameplate, existing part number, parts list, drawing or dismantled-component photographs to confirm that the replacement is being matched to the correct Group 2 wet end.
A model-family reference is a starting point, not proof of fit. If the casing reference is uncertain, send the available evidence for an OEM part-number cross-reference before production.
Casing Interfaces That Need Verification
- Nozzle and piping connection
- Casing-to-cover interfaces
- Impeller relationship and hydraulic clearance
- Gasket and sealing interfaces
- Mounting geometry, where applicable
- Material and pressure-boundary requirements
Do not infer dimensions from a similar pump or from a general ANSI designation. Verify the installed drawing revision, removed casing and mating components together.
Material Requirements
The requested material should be confirmed from the existing component specification and the process conditions. If the buyer wants to change material because of corrosion or erosion, collect the actual fluid, temperature and failure information before recommending an alternative alloy.
CF8M, CD4MCuN, Alloy 20/CN7M and nickel alloys may be considered for different services, but the correct material depends on concentration, contaminants, solids, pH when relevant, temperature and the observed failure mechanism. The alloy name alone is not a material-selection justification.
Inspection and Documentation Scope
Define the acceptance scope in the RFQ. Depending on the project, this may include visual and dimensional inspection, material traceability, PMI, hydrostatic testing or other inspection records. State which documents are required and confirm that they are available for the specific casing, material and configuration.
A replacement casing should not be described as universally interchangeable. Dimensional fit, pressure-boundary condition, material suitability and hydraulic relationship are separate checks.
What to Send for Group 2 Casing Review
- Pump model
- Group and exact size
- Casing part number, if available
- Current material
- Process fluid and temperature
- Casing photographs and nameplate photograph
- Drawings or parts list
- Required documentation
- Quantity
- Required delivery date
What Affects Delivery?
| Factor | Why it changes delivery |
|---|---|
| Material | Different alloys may require different casting and procurement routes |
| Pump size | Larger components can require different patterns and machining scope |
| Casting status | Availability differs by configuration and material |
| Machining scope | Finished interfaces and inspection take project-specific time |
| Inspection and documentation | PMI, MTR or special inspection adds defined scope |
| Current inventory | Availability must be confirmed at quotation |
Delivery depends on the required material, pump size, casting status, machining scope, inspection requirements, quantity and current inventory. Confirm availability and the required date for the actual RFQ.
Request a Group 2 Casing Review
For a configuration-specific quotation, send the installed pump details, casing photographs, material requirement, available drawing and required documentation. The Durco Mark III replacement resource provides a broader starting point for platform-specific requests.
Request Group 2 casing fit verification
Frequently Asked Questions
Does the Mark III family name identify the correct Group 2 casing?
No. Confirm the exact group, pump size, casing reference, interfaces, material and mating wet-end configuration from the installed pump.
Can I specify any alloy listed for a Group 2 casing?
No. Material suitability depends on the actual process fluid, concentration, temperature, contaminants, solids and failure mechanism, as well as the required casting specification.
What inspection documents should be requested?
Define the required scope in the RFQ. Depending on the project, this may include dimensional inspection, material traceability, PMI, hydrostatic testing or other specified records.
How should delivery be confirmed?
Confirm delivery for the actual material, size, casting status, machining scope, quantity, inspection requirements and current inventory rather than relying on a generic fixed lead time.
