Pump Analyser · capture a source curve, then compare measured performance

Pump Analyser

Diagnose pump performance in the field

Set the fluid and suction conditions, attach the real H-Q source, then compare the current duty with measured test points.

Flow defaults to L/s and head to m H2O. Change units in Account Settings.

Optional operators. Leave blank to keep the clean-water rating unchanged — overrides apply live to viscosity, density and temperature for every row.

Defaults match the clean-water rating — leave any field blank to keep the published curve unchanged. Viscosity above 1 cP derates the predicted Q & η via the HI 9.6.6 / ISO 9906 envelope (effluent, glycol, light oils).

Quick-select fluid

Snap density + temperature in one click. Override any field below.

Field-derived — typical effluent sits around 2–6 cP, glycol 30% ~15 cP.

Pre-populated from the temperature lookup. Override for seawater (1025), effluent (1010), or glycol.

Defaults to 20 °C when blank. The density lookup uses this when no manual override is supplied.

NPSHa (available) and NPSHr (required) overlay on the chart's NPSH axis. Atmospheric pressure, suction line geometry and the safety-margin rule all live here — the chart's safety band updates live with every keystroke.

NPSHa (available) and NPSHr (required) overlay on the chart's NPSH axis. The safety margin between the curves is chosen by the per-standard rule engine below — the chart chip always reads "ISO 2858 standard-frame" regardless of which one is selected internally.

Barometric pressure at site altitude. Field defaults to 1.013 bar (sea level).

Δz: free-surface above (+) or below (−) the pump centreline.

Vapor pressure for the operating fluid. Auto-fills from temperature when blank.

Manual fallback when the calculator below is left blank.

Suction-line friction loss

Uses the operating flow of the current duty The Darcy result is the automatic NPSHa contribution.

Calculate friction loss

Material supplies Darcy roughness.

Standard fittings

Minor-loss coefficients: elbow 0.9, tee 1.8, valve 0.2, foot valve 2.

Enter a design duty or select a pump prediction before calculating.
One source curve bundle for this pump
Upload one manufacturer image or PDF for the selected physical pump. Review every detected family from that same chart, confirm any warnings, and finalize once; the bundle becomes the analyser's reference everywhere below.

H-Q is required. Efficiency, NPSHr, and power stay optional and preserve their own source bounds; calculated or catalogue overlays remain visibly secondary.

One source · four possible families

No source analysed yet

Shared provenance
Upload the manufacturer chart once
H-Q is required. Efficiency, NPSHr, and power are reviewed only when their traces are visible in this same source.
Source type
H-Q
Required source trace · m3/h· bounds follow this family's points
awaiting analysis

Analyse one source to review this family. No extraction has completed yet.

Efficiency
Optional source trace · m3/h· bounds follow this family's points
awaiting analysis

Analyse one source to review this family. No extraction has completed yet.

NPSHr
Optional source trace · m3/h· bounds follow this family's points
awaiting analysis

Analyse one source to review this family. No extraction has completed yet.

Power
Optional source trace · m3/h· bounds follow this family's points
awaiting analysis

Analyse one source to review this family. No extraction has completed yet.

Only usable H-Q points are required. Detected optional families are included automatically.
Design duty
Chart-linked duty
Set the target flow, head, and efficiency. The live estimate updates as fluid and suction conditions change.

Planning-stage default 70%. Range 30–95%.

Suction-side NPSH (in the "NPSH (suction conditions)" section) feeds the cold-start curve and the duty-mismatch check above. The Fluid properties section above supplies the density and temperature that the power estimate here reads — refining either after typing a duty point re-anchors the predicted power.

Predicted performance
Fill in the highlighted fields to see the predicted curve.

Fill in the highlighted fields to see the predicted curve.

A frame designation + design RPM picks the calc-driven path. Design flow + design head + RPM alone drive the design-driven fallback.

Test points
One row per test point. Each row contributes a marker to the chart's measured overlay. Add as many as you need.

Reviewed curves above show the predicted performance before gauge readings. This row is ready for your first gauge reading.

  1. Row 1
    Electrical readings (optional)

    Enter either complete V/I readings or a standalone measured motor power. Both are optional and never invalidate a hydraulic test point.

Pump identity & motor envelope
Source of truth for this curve
One header for the whole pump session. The catalogue designation drives ISO 2858 model selection; the row list below carries every test point.

Custom dimensions path — geometry-nearest catalogue row. Pick a designation in the Pump Selection section below, or keep custom + type the three mm values directly.

Stamped from the nameplate. Captured verbatim on Save as test — no normalisation.

Live — the chart overplots the trimmed Q-H line via the affinity laws on every keystroke. Stays mm regardless of unit preset.

Flip to VSD/VFD when a drive cabinet is fitted; rows then carry their own drive Hz.

Motor envelope

Metadata — drives the motor envelope pill. The calc engine reads identity.designRpm, NOT this field.

Metadata — recorded for analytics. The calc engine assumes an induction-motor efficiency.

Source: nameplate RPM × mains frequency (derived).

— rpm

The calc engine reads identity.designRpm directly from this derived value (single source of truth).

Catalogue matches
Published curves are secondary references. A finalized reviewed source remains the primary curve; catalogue or derived/assumed curves are never silently substituted.
Verified records only

Matching: — · — · — · speed —

Enter or review manufacturer, model, designation, and speed to check the published library.

Picking a row stamps the three mm values onto the identity header (suction, discharge, nominal Ø). Speed is owned by the Motor Envelope.

Auto-prepopulate pump from design duty

After you type a duty point above, the closest catalogue row is selected here. Any manual pick on the dropdown or direct mm edits stick.