Pump Selection Tool — Ebora CE366

⚙️ Operating point · Power · NPSH

Pump Selection Tool

Find where a pump's H–Q curve meets the system head curve. Enter the static lift, the pipe and fittings, and three points off the pump curve — the tool locates the operating point and reports the flow, head, water & brake power, specific speed, pipe velocity and NPSH available.

⭐ Free to use · Balance … EP

① System

Flow unit

Static head H_s (m)

Pipe L (m)

Diam D (mm)

Friction f

Σ minor-loss K (fittings/valves, optional)

System curve: H_sys = H_s + K_sys·Q², with K_sys from friction + minor losses. Leave L/D/f blank for a static-only system.

② Pump curve — 3 points (Q, H)

Read three points off the manufacturer's H–Q curve (including shutoff at Q = 0 if you like). A quadratic is fitted through them.

Q₁ (L/s)

Q₂

Q₃

H₁ (m)

H₂ (m)

H₃ (m)

③ Power, speed & NPSH (optional)

Pump η (%)

Speed N (rpm)

Motor η (%)

Atm head (m)

Vapor head (m)

Suction lift z_s (m)

Suction-line loss h_Ls (m)

NPSH_a = atm head − vapor head − suction lift − suction-line loss. Fill this section only if you want NPSH_a (z_s is negative for a flooded suction).

⚙️ Operating point

—

Pump ∩ system

At the operating point

Flow Q

—

Head H

—

Pipe velocity

—

Water power

—

Brake power

—

Motor input

—

Specific speed N_s

—

NPSH available

—

System K_sys

—

Worked solution

⚠️ Study/estimating aid. The pump curve is a quadratic fit through three points — read them carefully. Confirm the friction factor, minor-loss coefficients and the actual pump & efficiency curves from the manufacturer's data. Always check that NPSH_a > NPSH_required.