Boiler Feed Pump Calculator | Toolifyr

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Boiler Feed Pump Calculator

Professional feedwater sizing for Total Dynamic Head, Pump Power, NPSH, Velocity, Density & Viscosity

Feedwater Sizing Calculator

Flow Rate (Q)

m³/hr | — GPM

Suction Pressure

bar absolute | — PSIG

Discharge Pressure

bar absolute | — PSIG

Water Temperature

°C | — °F (0–100°C range)

Pipe Diameter

mm | — inches

Pump Efficiency

System Static Head (TDH)

meters added to total dynamic head

NPSH Required

meters | — feet

Suction Static Head

meters (positive if source above pump)

Suction Line Loss

meters of head loss

Total Dynamic Head

—

— feet

Hydraulic Power

—

kW | — HP

Shaft Power

—

Motor Power (est.)

—

NPSH Available

—

meters | — feet

Fluid Velocity

—

m/s | — ft/s

Fluid Density

—

kg/m³

Fluid Viscosity

—

cP (mPa·s)

Key Boiler Feed Pump Formulas

📊 Flow Rate Conversions

GPM = m³/hr × 4.40287

m³/s = m³/hr ÷ 3600

📐 Total Dynamic Head

H = ΔP / (ρg) + ΔZ

H (m) = ((P_discharge − P_suction) × 100000) / (ρ × g) + ΔZ

⚡ Pump Power Requirement

Hydraulic Power (kW) = ρ × g × Q (m³/s) × H ÷ 1000

Shaft Power (kW) = Hydraulic Power ÷ (η / 100)

Motor Power (kW) ≈ Shaft Power × 1.10

💧 NPSH Available

NPSHa = P_s,abs / (ρg) + h_s − h_f − P_v / (ρg)

🔁 Fluid Velocity

v (m/s) = (Q / 3600) ÷ (πd² / 4)

Note: This calculator uses water property correlations for 0–100°C. Final pump selection should be verified with manufacturer curves and actual system losses.