WATER SYSTEMS
Match water transfer and irrigation pumps to the flow your operation needs.
Secure the inlet supply
Account for head losses
Meet flow and pressure
1
Falling water levels change suction conditions. Check the inlet layout and available suction head against the pump’s requirement.
2
Elevation and friction losses determine the head required. Actual flow is where the pump curve meets the system curve.
3
Required outlet pressure and simultaneous demand define useful delivery. A nameplate flow alone cannot establish performance at the destination.
| Demand pattern | Selection implication |
|---|---|
| Steady supply | Match the normal duty to an appropriate operating region for sustained use. |
| Seasonal demand | Assess changing source levels and flow demand across the season. |
| Peak or batch use | Compare peak duration with normal demand before choosing pump size and control strategy. |
| Replacing a pump | Measure the present duty and identify system changes before repeating the original selection. |
Equipment photograph
Poor delivery can originate in the source, pipeline or operating point. Bring the existing curve, measured flow and pressure, and pipe layout to the discussion so a replacement addresses the actual duty.
LOCATE THE CONSTRAINT
A low-flow complaint can originate at the source, along the pipeline or in a changed demand pattern. Identify that constraint before increasing pump size.
Source
A lower source level or a more restrictive inlet can change the suction conditions available to the pump.
Selection focus
Check source levels and the inlet arrangement against the selected pump’s suction requirement. A larger discharge capability does not resolve an unsuitable inlet supply.
Pipeline
Additional pipework, altered valves or a higher destination can change the system curve and the operating flow.
Selection focus
Update the route and loss information before comparing new curves. This helps determine whether the next step concerns the pipework, pump duty or both.
Demand
More simultaneous users, different irrigation zones or a changed transfer schedule can create a wider duty range.
Selection focus
Compare normal and peak conditions with the pump arrangement and control approach. A proposed extra pump or speed change must be assessed against the system, rather than treated as a fixed increase in output.
End-suction and inline pumps for water transfer and distribution.
Double-suction pumps for larger-flow water systems.
Mixed-flow pumps for high-flow duties with relatively low head.
Selection reading
APPLICATION QUESTIONS
Useful delivery is the flow and pressure required at the destination, across the operating conditions your site actually sees.
A centrifugal pump operates where its curve meets the system curve. Source and delivery conditions and the resistance of the pipework determine that intersection. Use the relevant model curve and complete system duty when assessing the required flow.
Not automatically. Parallel operation changes the combined pump curve, while the system still sets the resulting operating point. The additional flow depends on the shape of the system curve and the selected pumps. Assess the combined operation before choosing the arrangement.
Begin with the flow, total head and expected operating range, then compare the relevant curves. QI end-suction, QS double-suction and AHW mixed-flow constructions also have different layouts and access needs. Match hydraulic suitability and installation fit together.
Discuss the source, pipeline and normal-to-peak demand with BBP to compare suitable pump types.