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Title: Testing Orifice Meters Under Flowing Conditions
Author: Bruce J. Caldwell
Source: 1970 American School of Gas Measurement Technology
Year Published: 1970
Abstract: The title assigned my topic will mislead, if taken literally. If we assume an orifice meter consists of an orifice plate and its holder, then we should not suggest its inspection under flowing conditions. An attempt to do so would surely clash with the intent and purpose of pipeline safety legislation and the Department of Transportation. Therefore, in discussion, I will limit my remarks to conventional flow recorders found in typical orifice metering installations and allow more adventuresome types to explore inspection of primary metering elements under pressure. In my remarks about calibrating static and differential pressure elements of a typical flow recorder, I will also avoid any suggestion leading to calibration of these elements under flowing conditions. It follows that static pressures are something less than static in operating practice and differential pressures are seldom characterized by lack of movement. Therefore, any attempt to precisely measure and compare pressure readings with a reference standard must be undertaken under conducive circumstances. If meaningful resolutions are sought, pressures must be gaged under truly static conditions. This involves valve manipulations to isolate recorder indicating elements from any degree of pressure variation, something expected in a flowing stream. An accomplished technician will appreciate the requirements for gauging static pressures under conditions that approximate flowing conditions. Otherwise, test objectives are defeated, particularly when there is appreciable flow variation.

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