RLN Centerline Engineering – Stage Pumping Calculator

Design Basis

1 · Design flow & source

Design discharge

Discharge unit

Source supply

Source discharge (limited only)

Intake tank volume

m³

2 · Hydraulics

Head loss method

Water temperature (Darcy only)

°C

Max velocity (auto pipe size)

m/s

Minor loss ΣK per stage

ΣK

Residual head at delivery

Number of stages

1–6

3 · Pumps & efficiency

Duty pumps per stage (+1 standby)

1–4

Head safety margin

Pump efficiency

Motor efficiency

Stages (pump station → delivery tank)

Stage	Length (m)	Static lift (m)	Pipe type	Nominal size (DN)	Constants

Static lift = delivery tank water level − suction water level. Inside diameters are approximate (pressure class dependent); verify against the manufacturer's catalogue.

Pump Automation Setpoints (tank level-based)

Tank

Tank depth

Start / stop levels (delivery tank of each stage)

Lead pump ON level

% depth

Lag pump ON offset (below lead)

% depth

All pumps OFF level

% depth

Suction protection (dry-run)

Suction low-cutoff (trip)

% depth

Suction restart (reset)

% depth

Results

Paper:In the print dialog choose "Save as PDF", margins: None, background graphics on.

Demand & Simulation Setup

1 · Demand

Average demand at end of system

Demand pattern (hourly factors)

Day factor (× average, e.g. max day)

2 · Storage

Tank sizing

Storage volume per tank

m³

Auto-size: hours of peak demand

3 · Simulation

Simulation span

Variable span (used when span = Variable)

Initial tank level

Start clock hour (0–23)

Speed (sim hours per second)

Live Simulation

Interpretation & Optimization

Run the simulation to see the evaluation and suggestions.