Single- or multi-stage (up to four stages) reciprocating compressor performance from the cylinder data: volumetric efficiency, capacity, power, discharge temperature, rod gas load and a comparison with plant readings.
USD 49 one-time purchase
Download the sample report (PDF)
Need it once? Use it online: check your data free, unlock results from USD 9 for 3 runs.
What it does
Up to four stages
Per-stage bore, stroke, rod, speed, clearance, single or double acting, valve and pulsation losses, leakage.
Any gas or mixture
Library gases or up to 12 components with real-gas Z and k (Peng-Robinson); wet gas for intercooler condensate.
Capacity and power
Volumetric efficiency, actual and standard capacity, stage ratios, discharge temperature with limit check, indicated and brake power.
Rod gas load
Compression and tension as a percentage of your rating (gas load only, screening).
Compare with readings
Measured flow, power and temperatures give implied leakage, deviations and the yearly cost of the gap.
Capacity steps and what-if
Full load, head end, crank end and clearance pocket; suction pressure and speed cases.
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
Real pages from the workbook with its built-in example loaded (example data, not a measured plant). Choose a page below, or select the large image to enlarge it.
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 | 114 cases against an independent Python model (Peng-Robinson with converged solves): largest difference 3E-8 relative on any result; identical in SI, US and mixed units; thermodynamics cross-checked with CoolProp for six pure gases. |
| Free version | Try a free gas 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 | Single- or multi-stage (up to four stages) reciprocating compressor performance from the cylinder data: volumetric efficiency, capacity, power, discharge temperature, rod gas load and a comparison with plant readings. |
| 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. |