Plant engineering calculator · Updated 17 September 2026
Steam Trap Survey Loss Calculator — Failed Traps, Steam, Energy & Annual Cost
Turn a steam-trap survey into a fleet-level loss estimate. Model failed-open and leaking traps separately, apply a measured or engineering leak rate, then calculate failed trap count, steam loss, thermal loss, annual tonnes, annual cost and repair-payback screening.
Inputs
Live results
- Failed open 10.0 traps
- Leaking 8.0 traps
- Survey failure rate 18.0%
- Equivalent full-leak traps 13.20
- Steam loss 105.60 kg/h
- Annual loss 844.8 t
- Thermal loss 645333 kWh/year
- Avoidable steam cost 2112000/year
- Repair budget 90000
- Survey + repair program 105000/year
- Net first-year benefit 2007000
- First-year ROI 1911.4%
- Simple payback 0.6 months
Formula and method
failedOpen=N×FO%; leaking=N×L%; equivalent full-leak traps=failedOpen+leaking×leakFraction; steam loss=equivalent traps×full-open leak rate; annual tonnes=kg/h×hours/1000.
Worked example
For 100 traps with 10% failed open, 8% leaking at 40% severity and an 8 kg/h full-open leak estimate, the equivalent full-leak population is 13.2 traps before annualizing steam, energy and cost.
Assumptions and limits
- Full-open leak rate should come from a validated trap survey, orifice-flow method, OEM data or engineering estimate.
- Leaking-trap severity is uncertain; keep the entered leak fraction tied to the survey method instead of assuming every leaking trap is fully blown.
- This calculator quantifies survey economics; ultrasonic/temperature testing is still required to diagnose individual traps.
Frequently asked questions
What does this Steam Trap Survey Loss Calculator calculate?
Turn a steam-trap survey into a fleet-level loss estimate. Model failed-open and leaking traps separately, apply a measured or engineering leak rate, then calculate failed trap count, steam loss, thermal loss, annual tonnes, annual cost and repair-payback screening.
Is this suitable for final design?
Use it as a transparent engineering screen. Verify final decisions against measured data, OEM curves, applicable standards and site operating limits.
Why are assumptions visible?
Plant calculations can look precise while hiding uncertain inputs. MAXScanner keeps the governing assumptions visible so scenarios can be checked and compared.