# Boiler Feed Pump Calculation — Free Engineering Tool & Technical Reference

> boilerfeedpumpcalculation.site is a free online engineering calculator and technical resource for computing boiler feed pump flow rate, total dynamic head (TDH), hydraulic/shaft/motor power, Net Positive Suction Head Available (NPSHa), cavitation risk, and annual energy cost using temperature-interpolated liquid water density and saturation vapor pressure data (IAPWS Steam Tables).

## Key Features & Calculations

- **Feedwater Volumetric Flow Rate (m³/hr)**: Calculates design flow from Maximum Continuous Rating (MCR) steam capacity (kg/hr or TPH), blowdown, and safety margin, adjusted for temperature-dependent density (0–200°C).
- **Total Dynamic Head (TDH, m)**: Converts drum gauge pressure (bar g) into liquid meters column and sums static elevation rise plus discharge friction and control valve pressure drops.
- **Power Sizing (kW)**: Calculates Hydraulic Power (P_hyd), Shaft Brake Power (P_shaft), and Motor Nameplate Power Rating (P_motor) considering pump and motor efficiencies plus sizing margin.
- **NPSH & Cavitation Risk**: Computes Net Positive Suction Head Available (NPSHa) considering feed tank pressure, static suction head, suction line friction, and temperature-interpolated saturation vapor pressure (P_sat). Classifies risk into SAFE, MARGINAL, or DANGER states.
- **Annual Operating Energy Cost ($/yr)**: Estimates yearly electricity cost based on motor power, operating hours per year, and electricity tariff.

## Core Engineering Equations

- Volumetric Flow: `Q (m³/hr) = (Capacity_kg_hr / ρ) * (1 + Margin_pct / 100)`
- Operating Pressure Head: `H_press (m) = (P_bar_g * 100,000) / (ρ * 9.81)`
- Total Dynamic Head: `TDH (m) = H_press + H_static + H_friction`
- Hydraulic Power: `P_hyd (kW) = (Q * TDH * ρ * 9.81) / 3,600,000`
- Shaft Power: `P_shaft (kW) = P_hyd / (Pump_Efficiency / 100)`
- Motor Power: `P_motor (kW) = (P_shaft / (Motor_Efficiency / 100)) * (1 + Motor_Margin / 100)`
- NPSH Available: `NPSHa (m) = H_tank_abs + H_static_suction - H_vapor - H_friction_suction`

## Web Pages & Resources

- [Calculator & Engineering Guide](https://boilerfeedpumpcalculation.site/index.html): Main interactive calculator tool, worked sizing examples, thermodynamic formulas, and FAQs.
- [Privacy Policy](https://boilerfeedpumpcalculation.site/privacy-policy.html): Privacy policy, local browser calculation execution, and Google AdSense compliance terms.
- [Terms of Service](https://boilerfeedpumpcalculation.site/terms.html): Engineering liability disclaimer and ANSI/HI standards compliance notice.