What does a buyer check before selecting a pump?
They check the duty point against the performance curve, the wetted materials against the fluid, and the seal arrangement, because seals are where most pumps actually fail. A pump page without a curve cannot be selected from.
A process engineer is selecting a pump for a duty where the fluid is more demanding than the flow rate.
Reviewed 4 August 2026
Scope and specifications
- Pump type
- Centrifugal, positive displacement, diaphragm and peristaltic suit different fluids.
- Flow and head range
- The duty envelope the pump can cover.
- Performance curve
- The document a selection is actually made from.
- Materials of construction
- Wetted parts must survive the fluid.
- Seal arrangement
- Mechanical seal, packing or seal-less decides reliability and cost.
- Temperature and viscosity limits
- Determine whether the fluid can be handled at all.
- Connection sizes and standard
- Must match the existing pipework.
Documents buyers may need
| Document | What it proves | Where it belongs |
|---|---|---|
| Performance curveAsked at: every selection — this is the primary document | Flow, head, efficiency and net positive suction head required | Publish it |
| Materials specificationAsked at: fluid compatibility check | Wetted materials for each component | Publish it |
| Test certificateAsked at: acceptance | Measured performance of the supplied unit against the curve | Per shipment |
| Material test certificateAsked at: critical services | Composition of pressure-retaining parts | Per shipment |
| Declaration of ConformityAsked at: before shipment to regulated markets | Conformity with machinery and applicable equipment requirements | Publish it |
| Seal specification and interchangeabilityAsked at: maintenance planning | Seal type, and whether standard seals fit | Publish it |
| Spare parts list with interchangeabilityAsked at: total cost evaluation | What wears and whether parts are proprietary | Publish it |
Details for a useful enquiry
- Fluid, temperature and viscosity
- Decides the pump type and materials.
- Flow rate and head required
- The duty point.
- Suction conditions
- Determines whether the pump will actually work.
- Materials or existing pump being replaced
- The fastest route to a correct offer.
- Duty pattern
- Continuous, intermittent and batch change the selection.
- Connection standard and site
- Pipework and installation constraints.
Questions suppliers ask
Should performance curves be public or gated?
Public. The curve is how engineers select pumps, and gating it removes you from the selection entirely — they will simply use a manufacturer whose curves they can see. There is nothing confidential in a curve; competitors already know what your pumps do.
How should seal options be presented?
Clearly, with the standard the seal conforms to and whether common seals interchange. Maintenance teams care enormously about this because it determines whether a failed pump can be repaired quickly with a stocked part or waits for a proprietary component.
What do buyers most often get wrong when selecting?
Suction conditions. A pump selected correctly on flow and head still fails if the available net positive suction head is inadequate. Publishing the required figure prominently and explaining it plainly prevents failures that would otherwise be blamed on your product.
Check which documents and standards your buyer needs; requirements vary by market, customer and contract.
Plact Research. Plact's editorial desk for buyer-evidence research. Industry standards, documents and buyer questions are researched and drafted with Plact's AI tools, then reviewed by Praveen Kavuri before publication. Every claim cites the standard, regulation or public source it rests on.
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