Ordering a replacement slurry pump part starts with identifying the pump and the exact component. Measurements help confirm a match, especially when the nameplate is missing or the existing part came from another supplier. They are rarely sufficient on their own: two parts can have similar outside dimensions yet differ at the mounting face, shaft connection, liner interface, or internal flow passage.

Record the pump model and any part or drawing number first. Then measure the surfaces that locate and secure the component, photograph it from several angles, and mark visibly worn areas. If a dimension has been lost to wear, ask the supplier to verify it against a drawing or mating part rather than treating the damaged measurement as the original size.

Start with identification, then measure

Before cleaning or removing a part, photograph its installed position and orientation. Record the pump manufacturer, model, size, serial number, and any casting or part number that remains legible. Check the maintenance manual, parts list, purchase record, or previous order for a drawing revision and material specification.

After isolation and disassembly under the site’s maintenance procedure, clean the part enough to expose mounting surfaces and markings. Keep components from each pump together. Similar pumps in the same plant may have different impellers, liner arrangements, or materials.

A useful identification pack contains:

• A photo of the pump nameplate and assembled pump
• The old part number, drawing number, and revision, if available
• Photos of the removed part from the front, back, and side
• Photos showing how it fits against adjoining parts
• The material requested and the service conditions
• A dimension sheet with units and clearly marked measurement points

Parts lists commonly identify replacements by pump configuration and part number, not by a single overall dimension. Pump assembly instructions also distinguish between different liner arrangements and require the correct component diagram for the configuration. s3.us-east-1.amazonaws.com

Which dimensions should you record?

Measure clean, relatively unworn locating surfaces first. Use a calibrated caliper for accessible diameters and thicknesses, a micrometer where appropriate, and a depth gauge for recesses or shoulders. Large or irregular castings may require a marked sketch, straightedge, or dimensional inspection by a qualified workshop.

The table is a measurement guide, not a universal manufacturing specification. Exact tolerances and acceptance criteria depend on the pump design and approved drawing.

Measure features that control fit

For a circular part, take diameter readings at more than one position where access permits. Record whether a surface is machined, cast, coated, or visibly worn. For bolt patterns, note the number of holes, hole diameter, center-to-center spacing or bolt-circle diameter, and orientation relative to an identifiable feature.

A photo with a ruler gives scale, but it does not replace a written dimension. On the sketch, use arrows to show precisely where each reading was taken. Record all dimensions in one unit system—preferably millimeters—and label any converted values.

Do not copy the dimensions of a worn surface as if it were new

An old component is useful evidence of construction and assembly, but erosion, corrosion, distortion, and previous repairs can change its dimensions. An impeller inlet may have enlarged; a throat bush face may have lost material; a liner joint may be chipped or compressed.

Separate your readings into three groups:

1. Likely original fit features: protected machined shoulders, mounting faces, and locating diameters with no apparent damage.
2. Wear observations: remaining wall thickness, enlarged openings, rounded edges, cracks, and local material loss.
3. Uncertain dimensions: features too worn or inaccessible to reconstruct reliably.

Mark uncertain readings as “measured on worn part—verify against drawing.” If a critical interface has been destroyed, photograph and measure the corresponding undamaged mating part. Where drawings or an unused spare exist, use them to verify the intended dimensions. Do not set a new-part tolerance by estimating how much metal or elastomer has worn away.

This distinction matters particularly for the impeller-to-liner relationship: the assembly procedure and running adjustment depend on the actual pump configuration. otcindustrial.com

Check compatibility beyond dimensions

A replacement must fit the complete assembly, not just the opening in the casing. Confirm the mounting arrangement, fasteners, seal or joint surfaces, material, direction of rotation where relevant, and contact with adjoining wet-end parts.

For an impeller, the shaft connection and hydraulic geometry both matter. For a throat bush, confirm the locating and fastening features and its relationship to the impeller and cover plate. For liners, check whether the pump uses a metal, elastomer, or mixed arrangement; component layouts can differ. otcindustrial.com

Material is a separate decision. Send the existing material designation if known, but also describe the slurry and why the part is being replaced. Particle size and type, concentration, and corrosive conditions affect wear and material suitability. HI Data Tool If material choice is unresolved, review wear parts based on particle size before finalizing the request.

Example: a worn impeller with no readable part number

Illustrative example only.

A maintenance team removes an impeller from a mining slurry pump. The nameplate identifies the pump model, but the impeller casting number is illegible. The team records the impeller’s outside diameter, overall width, inlet diameter, vane count, rotation, and shaft connection. Photos show that the outer vane edges and inlet are worn, while the hub’s locating faces remain intact.

The team labels the inlet and outside diameters as worn measurements. It supplies the pump model, photographs of the shaft connection and surrounding liners, and a marked sketch to the replacement supplier. It also reports the approximate solids concentration, largest expected particles, slurry pH, and existing material if known.

The supplier can then check the proposed replacement slurry pump parts against the correct drawing and configuration. Ordering solely by the worn outside diameter could select the wrong impeller size or design.

A practical inquiry checklist

For a useful quotation, send the following in one package:

• Pump manufacturer, model, size, serial number, and nameplate photo
• Component name, quantity, and any part or drawing number
• Material specification, if known
• Dimensioned sketch with units and marked measurement points
• Front, back, side, and mating-interface photos
• A note identifying damaged surfaces and uncertain measurements
• Details of the adjoining components if the fit is unclear
• Application, slurry density or SG, solids concentration, maximum particle size, pH, temperature, and observed wear pattern
• Required delivery date and whether the part is for a planned shutdown or an urgent repair

If a drawing or original part number is available, send it even when you have measured the component. Ask the supplier to state which drawing or reference was used to confirm fit, the proposed material, and any dimensions or interfaces that still need verification before manufacture.

FAQ

Can I order a slurry pump part using photos alone?

👉Photos can help identify a part, but they may not establish its fit. Supply the pump model, part number or drawing where possible, plus measurements of critical locating and mounting features.

Is the outside diameter enough to identify an impeller?

👉No. Impellers can differ in width, inlet size, shaft connection, vane arrangement, and hydraulic design. Confirm the complete part against the pump configuration.

What if the old part is too worn to measure accurately?

👉Measure protected fit surfaces and the mating components, then mark worn dimensions as uncertain. Use an approved drawing, part number, or unused spare to establish the intended new-part dimensions.

Should I measure a rubber liner the same way as a metal liner?

👉Record its principal dimensions and interfaces, but account for its construction and condition. Deformation or damage can make a removed elastomer liner an unreliable sole dimensional reference. Confirm the exact liner arrangement with the relevant drawing.

What should purchasing request before approving a replacement?

👉Ask for confirmation of pump and part identification, drawing or reference, material, critical interfaces, quantity, and any unresolved dimensions. Make sure the quoted item matches the submitted configuration.

Ready to request a replacement?

Send the pump model, any part or drawing numbers, clear photos, and a marked dimension sheet through the Replacement Parts page. Include the slurry conditions and highlight any dimensions taken from worn surfaces. This gives the supplier a practical basis for checking compatibility before quoting.

Technical basis for editorial review

The article’s identification and assembly cautions are supported by a slurry pump spare-parts list and a pump installation/maintenance manual; the slurry-property point is supported by the Hydraulic Institute. The supplier manual was used to verify general assembly distinctions, without naming a competing brand or copying its diagrams into the published article.