So what are the differences between Venturimeter and Orificemeter, in terms of loss of energy, cost and their uncalibrated/ un-calibrated accuracies. Let's find out.
|Instrument||Loss of Energy||Initial Cost||Accuracy variation with calibration (uncalibrated accuracy)|
|Venturi||Venturi Meter minimizes the form friction and therefore less energy|
loss. About 90% is recovered.
|Initial cost is higher.||They are more accurate than the orifice meter, because they are generally less affected by temperature and corrosion etc. Their discharge coefficient varies with Reynold's number and|
variations may be 0.5- 1.5%
|Orifice||Due to the form friction, a large amount of energy is lost and|
unrecovered. Only 60-70% is recovered.
|They are in-expensive, because it is just a thin plate with orifice.||There are many factors including the sharpness of edges, corrosion, temperature pressure etc. which affect the performance of orifice. If all combined the inaccuracy may range up to 10%. So they are less accurate when uncalibrated.|
Thanks for reading.