Capacity, slip and brake power for simplex to nonuplex pumps, flow pulsation from the crank motion, acceleration head and NPSH with or without a suction dampener, and metering stroke settings.
USD 29 one-time purchase
Buying several tools? Get the Pumps Complete Kit — USD 129
Need it once? Use it online: check your data free, unlock results from USD 9 for 3 runs.
What it does
Every common type
Simplex to nonuplex, single or double acting, power or direct-acting steam pumps, metering pumps with stroke setting.
Capacity and power
Displacement, slip, hydraulic and brake power by Ludwig's equations.
Flow pulsation
Instantaneous flow over one crank turn and the variation above and below the mean — matches Ludwig's published patterns.
Acceleration head and NPSH
ha = L·v·n·C/(K·g) with HI/GPSA constants, friction at peak flow, NPSH margin and the suction pipe size that fixes it.
Dampener effect
Acceleration head with and without a suction pulsation dampener.
Findings
Insufficient NPSH, pulsation, speed and relief-valve reminders in plain words.
Built for engineers
- Visible formulas — nothing hidden, so you can check every step.
- Fully referenced — methods from the standard references, checked against their published worked examples.
- Safe to share — sheets are protected against accidental edits, with an open password so you can still customise.
- Built-in input checks — clear warnings for impossible inputs and values outside typical ranges.
For engineering estimates; verify against site data. Code-based methods are aligned with the publicly documented procedure; they are not a licensed reproduction or a certification.
Preview the workbook
An illustration of the sheet layout of this workbook, not a screenshot of calculated results. Select the image to enlarge it. For questions before you buy, email [email protected].
Specification and checks
| Format | Excel workbook (.xlsx), no macros |
| Version | v1.0 |
| Works in | Excel 2010 or later, Windows and Mac |
| Units | SI, US and British, mixed freely |
| Includes | Guide tab with method and references, calculator, print-ready report |
| Checked against | Reproduces all seven Ludwig Fig. 3-68 flow patterns and the HI/GPSA acceleration constants within 4 %; six cases match an independent Python model exactly. |
Online tool or Excel workbook?
| Online tool | Excel workbook (this page) | |
|---|---|---|
| What it does | The same sheet as the Excel workbook, run in your browser | Capacity, slip and brake power for simplex to nonuplex pumps, flow pulsation from the crank motion, acceleration head and NPSH with or without a suction dampener, and metering stroke settings. |
| Cost | Check your inputs free. Results: 3 runs for USD 9, or every online tool for USD 15 a month (USD 99 a year) | USD 29 once, yours to keep |
| Input checks and findings | Every input checked; findings with the unlocked results | Every input checked, with findings and recommendations |
| Report for your calculation file | Printable results sheet | Print-ready report with your plant, tag, document number, revision and sign-off |
| Formulas | Method described in the guide | Every formula visible in its cell |
| Save, edit and rerun your cases | Each run separately | Yes: keep and edit your own file |
| Works offline, on a plant PC | No, needs the internet | Yes: Excel 2010 or later, Windows and Mac |
Online access and the Excel workbook are separate licences: one does not include the other.
Compatibility, licence and support
| File | Excel workbook (.xlsx), no macros, version v1.0; works in Excel 2010 or later on Windows and Mac. Sheets are protected against accidental edits, with an open password so you can customise. |
| Licence | Single user. A team licence (up to 5 named users) is 3 × the shop price; site licences on request — licence terms. |
| Updates | Updates to this major version are included; download them again from the link in your receipt. |
| Support | Email [email protected] with your order number — questions on the method, your inputs or your results are welcome. |
| Refunds | If the tool does not work as described, or has an error we cannot fix, email [email protected] with your order number within 14 days of purchase and we will refund you in full. Refunds are not offered for a change of mind once a file has been downloaded. Read the full refund policy. |