Permanent pressure loss prediction for DP flow meters
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Fluid passing through a DP flow meter incurs a permanent pressure loss. This loss depends on the meter type, beta ratio and Reynolds number, and has a significant impact on energy costs and pump selection.
| Meter Type | Pressure Loss | At beta ratio 0.5 | Applications |
|---|---|---|---|
| Orifice | 60-70% | ~65% | General process |
| Venturi | 10-15% | ~12% | High flow, continuous operation |
| Flow Nozzle | 30-50% | ~40% | High-temp./high-pressure steam |
| V-Cone | 25-40% | ~35% | Short straight run |
| Wedge Meter | 40-50% | ~45% | Viscous fluids, slurries |
Orifice is most economical, but venturi may be preferable for large diameters
Pump energy costs due to pressure loss can reach tens of millions of KRW per year
For operation over 5 years, the venturi's low pressure loss can be more economical
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