Equipment · Website material ·
Brief answer
You need fluid properties, required flow and head, operating conditions and system layout. The old pump model is a useful starting point but does not replace a description of the actual process.
Describe the medium
Specify the liquid, composition, temperature, viscosity and inclusions. Record requirements for materials, seals and cleaning. Mark an unknown parameter as a question to verify rather than assuming the medium is equivalent to water.
Define the operating conditions
Gather required flow and head for typical system states rather than a single maximum figure. Grundfos materials show how pump and system characteristics relate to the operating point. Check a particular pump’s applicability against its documentation.
Check the installation
Power supply, connections, suction conditions, maintenance access and control methods matter. Clarify redundancy and the consequences of a shutdown. Identical external dimensions do not guarantee matching operating characteristics or compatibility with the process medium.
Compare quotations
Request curves for the required configuration, materials and test conditions. Normalize the scope: pump, motor, control and auxiliary units. Separately evaluate maintenance, consumables and pre-commissioning checks.
What to prepare
- Medium and temperature
- Flow and head under different operating conditions
- Connection diagram
- Nameplate and documents for the old pump
How to structure the comparison
| Field | What to record |
|---|---|
| Criterion | A requirement that affects the decision. |
| Confirmation | A document, measurement, answer or test result. |
| Open question | What is unknown, who clarifies it and which decision depends on the answer. |
Sources and limitations of use
The links below explain individual technical principles; choosing a specific solution requires current documentation and checks of operating conditions.
Questions and answers
Can we start without all the data?
Yes. Describe the current situation and flag unknown parameters. The materials list helps preparation but is not a mandatory questionnaire for initial contact.
Can this article alone support a decision?
This material helps structure questions. Selection for a particular company requires baseline data, checks of constraints and evidence for the option under consideration.