/Worked examples

Worked examples

Typical duties, worked through

Six everyday pumping jobs, sized the way we would size yours. They are examples run through our selector, not customer projects, and the figures are estimates for water.

Try your own duty

Every pump

runs on our test loop before it ships

Five shops, one works

Duty map

Six duties, one chart

Each worked example sits inside the envelope of the series chosen for it. Each number matches a worked example below.

Flow against head with the six series envelopes and the six worked examples

Raw-water intake for a treatment works

1,800 m³/h at 42 m · VS split-case

Chilled-water circuit in an office building

120 m³/h at 18 m · VI inline

Sprinkler system for a warehouse

300 m³/h at 100 m · VF fire package

Boiler feed for a steam plant

12 m³/h at 180 m · VM multistage

Drip irrigation from a canal

90 m³/h at 45 m · VX end-suction

Solvent transfer in a chemical plant

25 m³/h at 40 m · VP process

// Worked example //

Raw-water intake for a treatment works

Large flow at moderate head is split-case work. Double suction keeps the NPSH required low at the lowest wet-well level, and the top half lifts off for inspection without touching the pipework.

Duty

1,800 m³/h at 42 m

Liquid

River water, 5 to 20 °C

Series

VS split-case

Shaft power, water

≈ 246 kW · 315 kW motor

Open in the selector

Ask about this duty

// Worked example //

Chilled-water circuit in an office building

In-line flanges drop straight into the riser and the vertical motor saves floor space. Glycol raises the power a little, so the motor is sized for it.

Duty

120 m³/h at 18 m

Liquid

Water with 25 % glycol, 6 °C

Series

VI inline

Shaft power, water

≈ 8 kW · 11 kW motor

Open in the selector

Ask about this duty

// Worked example //

Sprinkler system for a warehouse

A fire set is tested as a set: pump, driver and controller on one baseplate. The curve must still reach the required pressure at 150 % flow.

Duty

300 m³/h at 100 m

Liquid

Clean water from a tank

Series

VF fire package

Shaft power, water

≈ 109 kW · 132 kW motor

Open in the selector

Ask about this duty

// Worked example //

Boiler feed for a steam plant

High head at small flow: stacked stages do it on a small footprint. At 105 °C the NPSH margin is the first thing we check.

Duty

12 m³/h at 180 m

Liquid

Feedwater, 105 °C

Series

VM multistage

Shaft power, water

≈ 10 kW · 11 kW motor

Open in the selector

Ask about this duty

// Worked example //

Drip irrigation from a canal

A back-pull-out end-suction pump keeps the wear parts easy to reach during the season, and a bronze impeller copes with the sand.

Duty

90 m³/h at 45 m

Liquid

Canal water with some sand

Series

VX end-suction

Shaft power, water

≈ 16 kW · 18.5 kW motor

Open in the selector

Ask about this duty

// Worked example //

Solvent transfer in a chemical plant

The liquid decides the metal and the seal before the size: stainless casing, cartridge seal with a flush, and a motor rated for the site's hazardous area.

Duty

25 m³/h at 40 m

Liquid

Toluene, 40 °C

Series

VP process

Shaft power, water

≈ 4 kW · 5.5 kW motor

Open in the selector

Ask about this duty