2900 or 1450 r/min? Same Pipeline Pump Model, Two Speeds
From DN65 upwards, many frames in our range appear twice under the same model name: once with a 2-pole motor at about 2900 r/min and once with a 4-pole motor at about 1450 r/min. Halving the speed changes everything.
| Model | 2900 r/min | 1450 r/min |
|---|---|---|
| 65-200 | 25 m³/h, 50 m, 7.5 kW | 12.5 m³/h, 12.5 m, 1.1 kW |
| 100-200 | 100 m³/h, 50 m, 22 kW | 50 m³/h, 12.5 m, 3 kW |
| 100-315 | 100 m³/h, 125 m, 75 kW | 50 m³/h, 32 m, 11 kW |
The pattern
At half the speed, flow halves, head falls to a quarter and power to roughly an eighth. These are the affinity laws, and the table follows them closely.
When the low speed is the better choice
- Circulation loops that need flow but little head
- Quiet locations such as hotels and offices
- Liquids with a little grit, where lower speed means less wear
When you order, always give the speed or motor power with the model. Both versions are listed in the selection table.
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