Abstract
Pressure difference devices, and especially orifice plates, continue to dominate industrial flow measurement despite the flood of ingenious and sophisticated new instruments in the past three decades. This dominance is dependent partly on the essential simplicity of these devices and partly on the confidence that their performance can be predicted without the need for calibration. In this paper the background to the development of the standardization of orifice plates is examined and the present situation reviewed. ISO 5167:1980 represents the consensus of expert opinion in this field, but demands for higher accuracy, for example in the bulk custody transfer of natural gas, have led to major new experimental programmes. These are reviewed, as are other aspects of ISO 5167 which are currently being considered for early interpretation and revision
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