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Title: Foxboro Orifice Meters
Author: L. H. Spink
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: The orifice meter is essentially a rate measuring device. From the coniinuously recorded rate of flow on the chart, total flows may be calculated or deduced hence, it is frequently called the inferential type of meter, since the gas is not divided out into known volumes and these volumes counted up on a counter or dial. The orifice meter is based upon the principle that any impediment placed in the hne of flow of a gas or fluid will create a drop In pressure that is. as long as there is any fluid flowing past or through the impediment, the pressure will be lower on the downstream side than on the upstream side, and the amount of this drop in pressure will bear definite relation to the rate of flow. The flat, square, sharp-edged orifice is chosen as the simplest and most easily reproduceable type of restriction. The pressure taps must be at a definite location corresponding to the location at which the calibration tests were run. These are commonly at 1 upstream and downstream on the face of the orifice plate or 24 pipe diameters upstream and eight pipe diameters downstream. Since the location of the pressure taps has a direct bearing on the pressure drop or differential which will be measured, they are a definite part of the meter setup.

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