Duty-point selection within one business day · Worldwide shipping and spares

Volute Pump Systems
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Industrial pumps and fluid-handling systems

Water that will not wait

Centrifugal, multistage, vertical turbine, slurry and submersible pumps sized around your duty point rather than a catalogue page. Send us the flow, the head and the fluid, and we will put the curve, the material grade and the seal plan in writing.

Explore the range Size my pump
Flow 3 – 8 500 m³/h
Head 5 – 480 m
Temperature −40 – 180 °C
Materials Cast iron · CF8M · Duplex · 27% Cr
End-suction · Multistage · Vertical turbine · Slurry · Submersible · ISO 2858 · ISO 5199 · ISO 9906 · API 682

The duty point

A pump is only as good as the point it runs at

Oversize a pump and it runs left of its best-efficiency point, where recirculation chews the impeller and the bearings pay for it. Undersize it and the system curve wins. We take the flow you need, the head your pipework actually costs you and the NPSH available at the suction, then trim the impeller so the duty point lands where the curve is flat and the efficiency is high.

  • Duty point plotted against the published curve before anything is quoted
  • NPSH available checked against NPSH required at the rated flow
  • Impeller trimmed to the duty, not rounded up to the next casing size
Send us your duty point
Duty point
  • Head curve
  • Efficiency
  • System curve
Flow 1 850 m³/h
Head 96 m
Efficiency 87.4 %

The range

Five families, one sizing method

Every family below is built to the same rule: the duty point decides the hydraulics, and the fluid decides the metallurgy.

All products
01 End-Suction Pumps Single-stage back pull-out pumps to ISO 2858 and ISO 5199 for clean and lightly loaded water, from booster… 1 model 02 Multistage Pumps Horizontal and vertical multistage sets for high head at moderate flow: boiler feed, reverse osmosis, mine dewatering and… 1 model 03 Slurry Pumps Rubber-lined and high-chrome slurry pumps sized around solids concentration and particle size rather than clean-water figures. 1 model 04 Submersible Pumps Dewatering, drainage and sewage pumps built to work in the sump rather than beside it. 1 model 06 Vertical Turbine Pumps Line-shaft and submersible-motor turbine pumps for wet pits, rivers, intakes and deep wells where the suction sits below… 1 model

Selected models

Built for a curve, not a shelf

Each model below ships with its measured performance curve and the material certificate for the wetted parts.

Full catalogue
Partly assembled centrifugal pump casing on an assembly stand

Inside the casing

Follow one litre of water through the pump

Suction, impeller, volute, discharge. Four stages, and every one of them is a place where a badly chosen pump loses head it will never get back.

  1. 01 Suction Liquid enters the eye of the impeller with the NPSH margin the site actually has, not the margin the datasheet assumes.
  2. 02 Impeller Vanes add velocity head. The diameter is trimmed to your duty point rather than shipped at the catalogue maximum.
  3. 03 Volute The spiral casing converts velocity into pressure and balances the radial load the impeller throws at the shaft.
  4. 04 Discharge Pressure leaves through the flange, measured across the curve on the test rig before the pump is crated.

Where they run

Four industries, four different ways to destroy a pump

Municipal water
01

Municipal water

Intake, transfer and distribution sets that hold their duty point across a full demand curve instead of throttling against it.

Mining and tailings
02

Mining and tailings

Rubber-lined and high-chrome slurry pumps selected on de-rated curves for the solids concentration and particle size actually in the line.

Power generation
03

Power generation

Cooling-water, condensate and boiler-feed duties with the material grades the temperature and the water chemistry require.

Process and chemical
04

Process and chemical

Sealless and mechanically sealed units matched to the fluid, with an API 682 flush plan chosen for the service rather than defaulted.

How it is built

Four gates between the order and the crate

Machined pump impeller
01

Select

You send flow, head, fluid, temperature, solids and the NPSH available at the suction flange. We place the duty point on the published curve and tell you where it sits relative to the best-efficiency point — including when the honest answer is a different pump.

02

Cast and machine

Casings are poured to the material the fluid requires: grey iron for clean water, duplex or CD4MCu for seawater and chlorides, high-chrome for abrasive slurry. Wear rings, shaft sleeves and impeller clearances are machined to the drawing, not to a tolerance band.

03

Balance and assemble

Every impeller is dynamically balanced to ISO 1940 G6.3 before it goes near a shaft. Bearing housings are assembled clean, seals are set to the chosen API 682 plan, and the coupling is laser aligned on the baseplate.

04

Test and record

Each unit runs on a hydraulic test rig to ISO 9906 Grade 2. Flow, head, power and vibration are measured across the curve and recorded against the serial number, so the sheet in the crate describes that pump and not the model.

Technical notes

Field notes from the pump room

All articles

Request a quote

Tell us the duty. We will send the curve.

Flow, head, fluid, temperature and how many hours a day it has to run. That is enough for us to come back with a model, a curve, a material specification and a price — usually inside one business day.

  • Duty-point selection by an application engineer, not a form robot
  • Performance curve and material list with every quotation
  • Export documentation and spares support wherever the pump lands

We reply to every enquiry within one business day.