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Title: Spin-Offs From The Development Of Rotary Gas Meters
Author: Ing J.T.M. Bergervoet
Source: Flomeko 2003
Year Published: 2003
Abstract: : The basic principle of a rotary gas meter consists of two rotors in the form of a figure -8 that rotate inside each other with the precision of a gear wheel. The outer edges of these rotors turn in a very close fitting measurement chamber. The outer edges of the turning rotors transfer fixed quantities of gas from the inlet to the outlet like small buckets. Because the radii of the sealed streams in the middle between the two rotors always vary there is a discontinuous volume of gas passing per angle revolution of the rotors. The shape of variation is near a sinus and the frequency is four times the frequency of the rotor revolution and the amplitude is near 12% of the average flow. These variations give an irregular rotating of the rotor at low flows and pressure and flow pulsations at higher flows. These pulsations can lead to resonances in the installation where they are mounted in. This can give sound problems and mis-indication of the rotary gas meter itself or to other devices in the installation.

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