Fundamentals of turbine meters
- American Meter Co., Burlingame, CA (United States)
Gas measurement in the U.S. and around the world is dominated by diaphragm, rotary, turbine, and orifice meters. Each serves a different segment of the gas industry and each has its own set of advantages and disadvantages. These four main types of meters can be broken into two distinct categories: positive displacement, and inferential. Diaphragm and rotary meters fall into the positive displacement group because they have well-defined measurement compartments that alternately fill and empty as the meter rotates, By knowing the volume displaced in each meter revolution and by applying the proper gear ratio, the meter will read directly in cubic feet or cubic meters. Turbine and orifice meters have no measurement compartments to trap and then release the gas. These meters are categorized as inferential meters in that the volume passed through them is {open_quotes}inferred{close_quotes} by something else observed or measured. In the orifice meter the volumes are determined only by knowing the inlet pressure, differential pressure, plate size, and piping characteristics, all of which {open_quotes}infer{close_quotes} the flow rate that in turn can be integrated over time to provide the volume. Turbine meters, also called velocity meters, {open_quotes}infer{close_quotes} the volume of gas passing through them by measuring the velocity of the gas stream. Gas moving through the meter impinges on a bladed rotor resulting in a rotational speed that is proportional to the flow rate. The volume is determined by counting the number of meter rotations. The purpose of this paper is to provide an overview for the installation, maintenance, and proving of axial flow type turbine meters.
- OSTI ID:
- 146244
- Report Number(s):
- CONF-950553--
- Country of Publication:
- United States
- Language:
- English
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