What are the advantages of high accuracy oval gear flowmeters compared to Coriolis Mass Flow instruments?Comparison of Coriolis Mass Flow to Bopp & Reuther Oval Gear Flow Metering
| Coriolis Mass Flow | B&R Oval Gear | |
| Measurement | Mass Flow, volume calculated |
Volumetric Flow, mass calculated |
| 70% of the applications use volumetric flow output: why using an indirect method which requires volume/mass calculations? | ||
| Reaction time (to flow, temp, pressure change) |
3-4 sec | 0.5-0.6 sec, suitable for fast batching |
|
Pressure drop for high viscosity |
exponentially rising for higher viscosities | low, energy saving |
| Range of viscosity | viscosity specific, narrow range | from LPG to bitumen |
| Zero offset calibration | every 6-18 months, regular maintenance | no offset drift, no EMC or software issue |
| Average life time | 10 years | 25 years |
| Spare part availability | 10 years | 50 years |
| Initial Cost | 25% lower than OG | high |
| Calibration, Repair, Maint. Cost | high | about 40-50% of Coriolis MF |
| Cost of Ownership (15 years) | high | 20-25% lower than Coriolis MF |
Compared to other Oval Gear and PD technologies B&R oval gear Meters have only 2 moving parts with no friction, no low/high pressure in the measuring chamber. The pivoted oval wheels are moved and lubricated by the process liquid. They have the lowest pressure drop of PD meters and require no straight inlet or outlet.
Summary:
CMF offer accurate and reliable measurement and should be considered where mass is the required output parameter. CMF need regular zero offset calibration for exact measurement. Their life span, electronic set up and spare part availability is limited to 10 years before replacement.
Bopp & Reuther gear flow meters will be the economic choice for plant owners in the long term perspective with low maintenance and calibration requirements.
