A steam-turbine-driven compressor train as one system: shaft power the turbine can deliver against what one or two compressor casings need, the margin, and the speed that balances the train.
USD 49 one-time purchase
Need it once? Use it online: check your data free, unlock results from USD 9 for 3 runs.
What it does
Turbine side
IAPWS-IF97 steam, efficiency entered or found from the exhaust temperature, mechanical and gearbox loss, available shaft power.
Compressor side
Real-gas polytropic head, efficiency and power for one or two casings in series, any gas or mixture of up to 12 components.
Train balance
Power margin in kW and %, the turbine efficiency that just carries the load, the steam flow needed.
Speed
Operating against maximum continuous speed with affinity-law scaling, and the speed at which available power balances the load.
Cost of the efficiency gaps
Turbine and compressors against reference, in extra steam and money per year.
What-if tables
Steam temperature and pressure, exhaust pressure, suction temperature and train speed.
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 | 88 cases against an independent Python model (iapws steam, separate Peng-Robinson solver), about 13,000 compared values agreeing within 2.3E-5 relative; 18 edge and error cases give the right message. |
| Free version | Try a free pump efficiency calculator |
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 | A steam-turbine-driven compressor train as one system: shaft power the turbine can deliver against what one or two compressor casings need, the margin, and the speed that balances the train. |
| 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 49 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. |