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Title: Turbine Meter Testing
Author: Herbert L. Clark
Source: American Gas Association 1979
Year Published: 1979
Abstract: The turbine meter is classified as a velocity type inferential flow meter. It is so designated because the flow of gas causes the meter impeller to rotate at a speed proportional to the velocity of the gas stream and the number of times the impeller turns infers a certain amount of gas has passed through the meter which has an area of known dimensions. Anything that changes this relationship will change the proof of the meter. The impeller is the heart of the measuring module and its design is the most critical item of the meter. Many hours were expended in testing different shapes, angles and sizes of impeller blades to obtain the required results. Starting torque, running torque, speed and many other considerations were plowed into the final product. If the design is altered in any way it may adversely aflect meter accuracy. If the impeller is designed and built strongly enough, the angle of the blades on the impeller will not change and we should not have to be concerned with that. However, it has been found that the most important portion of each blade is the configuration of the downstream edge and surface. If this edge or surface is altered, including a buildup of any foreign material, the meter proof at all ilow rates can be affected. Oddly enough the leading edge of the blade has very little, if no effect on the meter proof. It can be worn or nicked and as long as the balance of the impeller is not seriously affected, there will be no appreciable change in the proof.

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