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Title: Flow Meter Installation Effects
Author: Eric Kelner
Source: 2008 Appalachian Gas Measurement Short Course
Year Published: 2008
Abstract: Meter station piping installation confi guration is one of a number of variables that may adversely affect meter accuracy. Some piping confi gurations can distort the fl ow stream and produce fl ow measurement bias errors (i.e., offsets in the meter output) of up to several percent of reading. Valves, elbows, or tees placed upstream of a fl ow meter are just some of the piping elements that can distort the fl ow stream. In this paper, installation effects are discussed with respect to two of the four main components of a fl ow measurement system: the meter, or primary element, and the secondary (pressure and temperature) instrumentation. The effect of the velocity profi le of the fl ow stream on orifi ce, ultrasonic, and turbine fl ow meters is discussed next. Installation conditions that may adversely impact the accuracy of pressure and temperature measurements are discussed after that. The gas chromatograph and the fl ow computer, the third and fourth components, are treated in separate courses.

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