ANSI Pump RFQ & Commissioning Checklist: 5 Selection Checks

Check 1: Define the operating profile, not one duty point

Normal, minimum, and maximum flow are not interchangeable labels. They describe different process conditions, and the pump may spend most of its time away from the design point. An RFQ should show the conditions the supplier must evaluate, including head, temperature, fluid properties, control mode, and expected operating time where known.

Use a table like this and replace the example entries with project data:

Also state whether the values are measured, calculated, or estimated. If the process has batches, seasonal conditions, parallel pumps, or changing tank levels, describe those states instead of hiding them behind one “design point.” A selection should be checked against the duty that matters to production and reliability, while still covering the credible extremes.

Check 2: Put the pump curve and system curve in the RFQ review

The pump curve describes what a pump can produce at a stated speed, impeller diameter, fluid basis, and test condition. The system curve describes the head the installation requires as flow changes. The operating point is where the two curves intersect; that intersection, not the isolated catalog duty point, is where the installed pump tends to operate.

For an existing system, send measured flow, suction pressure, discharge pressure, valve position, speed, and process state. For a new system, send the piping layout, elevation changes, vessel pressures, fittings, heat exchangers, control valves, and expected fluid properties. Avoid presenting a friction estimate as measured fact. The pump calculators can help organize total dynamic head, pipe-loss, NPSH, and power inputs for engineering review.

Ask each supplier to show the proposed pump curve and the project system curve on the same plot. Check the intersection at normal, minimum, and maximum conditions where applicable. If the curves do not overlap in the required operating region, request a different pump, impeller trim, speed, control strategy, or system review rather than relying on a margin added to the nameplate.

Check 3: Verify NPSH and operating region across the real range

NPSH review should use the manufacturer’s NPSH required curve, the project’s NPSH available calculation or measurement, and the applicable project margin requirement. NPSH is not a single universal ratio that can be copied from another order. Liquid temperature, vapor pressure, elevation, suction piping, tank pressure, flow, and transient operation all affect the result.

• Identify the minimum suction condition and the highest credible liquid temperature.
• Provide NPSHa if it is available, and identify whether it is calculated or measured.
• Request the NPSHr curve over the approved operating range, not only at one duty point.
• Confirm the manufacturer or project limits for preferred and allowable operating regions where those limits are defined.
• Record assumptions about fluid vapor pressure, specific gravity, viscosity, and dissolved or entrained gas.

Where a replacement uses a different impeller, speed, seal chamber, or power end, repeat the hydraulic and mechanical review. A replacement that fits the flange pattern may still have a different NPSHr, shaft arrangement, seal environment, or motor load.

Check 4: Compare suppliers by evidence, not purchase price alone

Price is one RFQ field, not the complete technical decision. Ask suppliers to return comparable evidence and to identify deviations explicitly. This makes it easier to distinguish a genuine fitment difference from a missing document or an assumption.

For materials, distinguish the specified alloy or casting grade from a family name. Alloy 20 / UNS N08020 is not the same designation as a CN7M casting grade, and C-276 / UNS N10276 is not the same designation as CW2M. Final selection depends on concentration, temperature, contaminants, velocity, solids, pH, chloride level, and oxidizing or reducing conditions. Ask for the material basis and any available inspection records rather than accepting a generic “corrosion resistant” description.

Check 5: Separate FAT from field commissioning

A factory performance test proves performance on a defined test stand, with a stated test fluid, instrumentation, procedure, and acceptance basis. Field commissioning verifies the installed pump and system: piping condition, rotation, alignment, valves, suction conditions, process fluid, controls, vibration, leakage, and actual duty.

Put both scopes in the RFQ. For factory work, define the curve, test points, tolerance or acceptance basis, instruments, and documents required. For field work, define who will measure flow, suction and discharge pressure, speed, motor power, vibration, bearing temperature, and process variables, and under which stable operating conditions. A field deviation needs investigation; it should not automatically be attributed to the installation or the supplier without evidence.

For standards context, consult the current applicable ASME B73.1 specification and the project’s purchased requirements. The governing acceptance basis is the current project specification and approved test procedure, not a generic statement copied from another pump.

Copy/paste ANSI pump RFQ checklist

1. Existing pump manufacturer, model, size, frame or group, and tag number.
2. Complete pump or replacement-part scope, including casing, impeller, shaft, seal, power end, or coupling.
3. Normal, minimum, and maximum flow with units.
4. Head or pressure requirement at each relevant condition.
5. Liquid name, concentration, solids, gas content, specific gravity, viscosity, and vapor pressure if known.
6. Normal, minimum, and maximum temperature.
7. NPSHa calculation or measurement, including suction vessel pressure and level range if available.
8. Motor voltage, frequency, rated power, speed, enclosure, and service-factor information.
9. Seal type, seal chamber arrangement, flush or barrier plan, and elastomer requirements.
10. Required material grades, corrosion basis, lining or coating requirements, and temperature limits.
11. Mounting dimensions, flange standard and rating, shaft or coupling details, rotation, and envelope constraints.
12. Required drawings, curve, data sheet, material records, dimensional report, and deviation list.
13. Factory test, hydrostatic test, inspection, and field commissioning scope.
14. Delivery, packaging, preservation, spare-parts, and documentation requirements.

When to use the ANSI Pump Selection Tool

If some data is missing, start with the ANSI Pump Selection & Replacement worksheet. It accepts an existing pump reference, operating duty, material information, and supporting drawings or nameplate details. Treat the result as an engineering review route, not a final model guarantee; exact fitment still depends on the model, size, frame or group, interfaces, materials, seal chamber, and operating conditions.

FAQ

What information should be included in a centrifugal pump RFQ?

Include the pump model and interfaces, normal/minimum/maximum duty, liquid and temperature data, NPSH information, materials, seal arrangement, motor details, drawings, test scope, and documentation requirements.

Should a pump RFQ include minimum and maximum flow?

Yes, when those conditions are credible. They help the supplier check operating region, NPSH, power, control behavior, and mechanical risk across the real operating envelope.

Does an ANSI flange match prove full interchangeability?

No. It confirms only one interface dimension. Full fitment also requires model, size, frame or group, shaft and seal arrangement, materials, impeller hydraulics, clearances, and duty verification.

Is factory performance testing the same as commissioning?

No. Factory testing uses a defined test setup. Commissioning verifies the pump after installation in the actual piping, process, controls, and operating conditions.

What data should be sent for a replacement pump quotation?

Send the model and size, nameplate or drawing, duty and liquid information, temperature, seal and material details, motor and dimensions, plus the required test and documentation scope.

Engineering note: This checklist is a starting point for an RFQ. Final selection and acceptance should follow the current project specification, approved drawings, applicable standards, and documented manufacturer procedure.