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Title: Flow Measurement With Insertion Turbine Meters
Author: Richard E. Zimmermann
Source: 1975 International School of Hydrocarbon Measurement
Year Published: 1975
Abstract: Insertion turbine meters are becoming increasingly popular as a means of flow measurement. Primary features contributing to their popularity are relatively low cost for large lines, ease of installation and maintenance, high sensitivity for low flow rates, and convenient sinusoidal pulse output easily processed by inexpensive signal conditioning equipment. Under ideal conditions, their performance can approach that of full bore turbine meters in both liquids and gases. Basically, an insertion turbine meter consists of a small rotor mounted at the end of a stem with a pickoff that senses the rotation of the rotor. As such, it is a sampling device, sensing fluid velocity at a discrete location in the pipe. Thus, its output does not indicate volumetric flow rate as in the case of a full bore turbine meter, but the flow velocity at a point. The velocity profile of the flow must be known before the volumetric flow rate can be determined. The greatest limitation on the accuracy of an insertion meter is the extent to which the calibration conditions duplicate the conditions of use. When it is calibrated in place in a section of the line in which it will be used, a high degree of accuracy may be obtained. With other calibration techniques, care must be taken to assure that the output of the meter represents the desired information. An insertion meter is best utilized where ease of installation and maintenance and cost are of greater importance than the extreme accuracy obtainable with a full-bore turbine meter.

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