The short answer
Correct pump selection starts by defining the required flow and total head at the same duty point. Next, assess liquid properties, suction conditions, materials and controls. Motor power or pipe diameter alone is not enough.
Consider flow and head together
Flow is the liquid volume required per unit of time. Head represents the energy difference the pump must overcome. Add the losses from pipes, bends, filters and other fittings to the static elevation difference. A family’s maximum flow and maximum head generally do not occur simultaneously. Do not interpret the two catalogue limits as one duty point.
The liquid determines material selection
The liquid name alone may not be enough. Share temperature, density, viscosity, pH, chemical composition and solids content. Drinking water, process water and wastewater create different design conditions. Compatibility assessment includes impellers, elastomers and mechanical seals as well as the pump casing.
Do not overlook suction conditions
The supply level and inlet pressure matter for dependable operation. Assess available NPSH using tank-level variations, suction-line losses and temperature. Compare site conditions with the manufacturer’s requirement and an appropriate engineering margin.
What should your enquiry include?
Share the required flow and head, liquid properties, power supply, daily running hours, installation location and control requirements. For replacement duties, a nameplate photo, model code and description of the problem are helpful. Our technical team can use this information to identify the suitable family and any further data required.