Boiler Feed Pump Head & Power Calculator

Calculate total dynamic head (TDH), discharge pressure, water horsepower (WHP), and brake horsepower (BHP) for steam boiler feedwater pumps.

⚙️ Engineering

Verified Formula

Enter Calculation Inputs

Fill in the fields below. Instant client-side computation runs automatically in your browser as you type.

Boiler Steaming Capacity

lbs/hr steam

Boiler Operating Pressure

psig

Deaerator Feedwater Pressure

psig

Pump Hydraulic Efficiency

✓ Computed Output

Computation Ready

Calculation performed instantly via mantranews24 verified mathematical model.

Common Searches & Natural Queries

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What is the Boiler Feed Pump?

Boiler feedwater pumps must overcome boiler drum operating pressure, economizer friction, feed regulating control valves, and elevation lift while providing continuous water supply to prevent dangerous dry-firing. Feedwater capacity is typically sized at 1.15 to 1.25 times maximum steaming rate.

Mathematical Formula & Methodology

The mathematical model underlying this tool operates on the following verified equation:

Total Head (ft) = (P_boiler - P_deaerator) × 2.31 / SG + Static Head + Friction Loss; BHP = (Flow GPM × TDH ft × SG) / (3,960 × Pump Efficiency)

Understanding the Parameters:

Boiler Steaming Capacity (measured in lbs/hr steam) — Primary input variable.
Boiler Operating Pressure (measured in psig) — Primary input variable.
Deaerator Feedwater Pressure (measured in psig) — Primary input variable.
Pump Hydraulic Efficiency (measured in %) — Primary input variable.

How to Use This Calculator

Input boiler steam rating in lbs/hr, operating steam drum pressure, deaerator pressure, and pump efficiency. The calculator sizes minimum GPM, total dynamic head, and required electric motor brake horsepower.

Worked Numerical Example

💡

Boiler steaming 25,000 lbs/hr at 150 psig. Water density gives ~50 GPM baseline, sized to 60 GPM with 20% margin. Pressure differential = 150 - 5 = 145 psi. Differential head ≈ 145 × 2.31 / 0.96 = 349 ft. Adding 50 ft for piping and valve friction = 399 ft TDH. BHP = (60 × 399 × 0.96) / (3,960 × 0.70) = 8.3 hp motor (specify standard 10 HP motor).

Key Considerations & Standards

Ensure Net Positive Suction Head Available (NPSHA) exceeds NPSH Required by the pump to prevent destructive cavitation caused by boiling hot feedwater.

Frequently Asked Questions

Why does high temperature reduce pump performance?

Hot water has a high vapor pressure. If pressure drops near the pump impeller inlet, the water flashes into vapor bubbles that collapse violently (cavitation), pitting metal surfaces.

What is the standard design safety factor for feed pumps?

ASME section I recommends sizing boiler feed pumps for 115% to 125% of the maximum continuous rating (MCR) of the boiler.