Pump Head — Water Pump Sizing

System inputs

LIVE

Duty & fluid

Project / report title Flow rate Temp (°F) Suction P (psig) Discharge P (psig)

Elevations (ft)

Suction surface Pump centerline Discharge surface / outlet

Pipe

ID suction (in) ID discharge (in) Material User ε (ft) Margin on losses % Straight L suction (ft) Straight L discharge (ft)

Same diameter suction & discharge Include exit velocity head

Fittings (qty → Leq)

Fitting	Suc	Dis

Suction Leq 0 ft

Discharge Leq 0 ft

NPSH & power

Atm (psia) NPSHr (ft) Pump η % Motor η %

Method: Darcy–Weisbach + Haaland f, fittings via Leq ≈ K·D/0.02. For final design cross-check HI / Crane TP-410 and the manufacturer curve.

Design TDH

—ft

Rounded up for selection

Flow

—GPM

Required capacity

Brake HP

—BHP

At assumed pump η

Motor size

—HP

~1.15 service factor

System schematic

ELEVATIONS · FLOW

System curve

H vs Q

TDH breakdown

ft

Static head

—

Pressure Δ

—

Friction + margin

—

Exit velocity

—

TDH

—

Pipe velocity

ft/s

—

Suction

—

Discharge

—

NPSH available vs required

MARGIN

NPSHa—

NPSHr—

Margin—

—

Hydraulic details

CALC

Specific gravity

—

Kinematic ν (ft²/s)

—

Vapor head (ft)

—

Re suction

—

Re discharge

—

Regime (disch.)

—

f suction

—

f discharge

—

hf suction (ft)

—

hf discharge (ft)

—

Water HP

—

Input kW

—

PHP engine: calc.php · Live UI: assets/calc.js · Same equations as the spreadsheet. Run with php -S localhost:8765 -t app from the project folder.