Calculator Inputs
Formula Used
Flow conversion: Q = Flow ÷ 3600
Hydraulic power: Ph = ρ × g × Q × H ÷ 1000
Pump shaft power: Ps = Ph ÷ ηpump
Required turbine output: Pt = Ps ÷ ηdrive × (1 + margin)
Gross enthalpy drop: Δh = hin − hout
Useful enthalpy drop: Δhuseful = Δh × ηturbine
Steam mass flow: m = Pt ÷ Δhuseful
Specific steam consumption: SSC = steam kg per hour ÷ turbine kW
How to Use This Calculator
- Enter the required pump flow in cubic meters per hour.
- Enter total dynamic head, including elevation, friction, valves, and discharge pressure.
- Use the fluid density expected on the construction site.
- Enter pump, drive, and turbine efficiencies as percentages.
- Add steam inlet and exhaust enthalpy values from steam tables or vendor data.
- Enter operating hours and steam cost for budget planning.
- Press Calculate to show results above the form.
- Use CSV or PDF download for records and project review.
Example Data Table
| Scenario | Flow m³/h | Head m | Pump Efficiency | Turbine Efficiency | Enthalpy Drop kJ/kg | Use Case |
|---|---|---|---|---|---|---|
| Dewatering Pump | 80 | 42 | 68% | 60% | 520 | Excavation water control |
| Temporary Fire Water | 150 | 75 | 74% | 64% | 620 | Site protection service |
| Boiler Feed Support | 45 | 120 | 70% | 66% | 700 | Utility plant operation |
Why this calculator matters
A pump driven by a steam turbine is common where electric power is limited, costly, or reserved for other site systems. Large construction projects may use this arrangement for dewatering, temporary boiler feed, drainage bypass, fire water service, utility flushing, and process support. The calculator links the pump side and the turbine side in one workflow. It converts flow, head, density, pump efficiency, drive loss, turbine efficiency, and steam enthalpy drop into useful planning figures.
Better early planning
Early sizing decisions often use rough allowances. Those allowances can hide steam demand, fuel cost, and condensate handling needs. This tool exposes each step. Hydraulic power shows the true water moving duty. Shaft power shows the demand after pump losses. Turbine output adds coupling and gearbox losses. The steam rate then shows the mass flow needed to deliver that output.
Construction use cases
Temporary utilities change often on active sites. A trench pump may face a new discharge route. A bypass line may need greater head after a valve change. A boiler house may support more users than expected. With this calculator, a planner can test those changes before ordering equipment. The result helps compare pump selections, turbine trims, steam header capacity, hose sizes, and operating cost.
Reading the results
A low hydraulic power with a high steam flow usually points to poor efficiencies or a small enthalpy drop. A high shaft power may indicate excessive head, overestimated flow, or unsuitable pump selection. Specific steam consumption helps compare alternative turbines. The annual steam cost gives a budget view for long running services.
Practical notes
Use measured site data whenever possible. Enter total dynamic head, not only vertical lift. Include friction, fittings, valves, strainers, temporary pipe runs, and discharge pressure. Use realistic pump efficiency at the duty point. Use turbine data from the vendor for enthalpy drop and efficiency. Add a margin for fouling, wear, cold starts, and field changes, but avoid excessive margin. Oversizing can waste steam and reduce controllability.
Keep records for every revision. Save the exported files with project dates and assumptions. That practice helps engineers, supervisors, and quantity teams review changes, explain fuel use, and defend temporary utility decisions during audits and later cost claims.
FAQs
What is a pump steam turbine calculator?
It estimates pump power demand and the steam flow needed by a turbine driver. It combines hydraulic duty, equipment efficiencies, steam enthalpy drop, and operating cost into one practical construction planning result.
Can this calculator replace vendor sizing?
No. It is useful for planning, estimates, and comparison. Final equipment selection should use pump curves, turbine performance data, site conditions, and manufacturer review.
What head value should I enter?
Enter total dynamic head. Include static lift, pipe friction, fittings, valves, strainers, discharge pressure, and temporary hose losses. Do not use vertical height alone unless other losses are negligible.
Why is steam enthalpy drop important?
The enthalpy drop shows how much energy each kilogram of steam can provide. A larger useful drop usually reduces the steam mass flow needed for the same turbine output.
What does specific steam consumption mean?
Specific steam consumption shows kilograms of steam used per kilowatt-hour of turbine output. Lower values usually indicate better steam use, assuming the duty and assumptions are correct.
Should I include a design margin?
Yes, but use it carefully. A margin helps cover wear, fouling, temporary pipe changes, and field uncertainty. Excessive margin can oversize the turbine and waste steam.
Can I use this for dirty water pumping?
Yes, for early estimates. Use the correct fluid density and realistic pump efficiency. For slurry, solids, or severe service, confirm pump selection with detailed vendor data.
Why does my steam cost look high?
High cost may come from high head, low pump efficiency, poor turbine efficiency, small enthalpy drop, long operating hours, or expensive steam generation. Review each input carefully.