Seung-Hee An, Jae-Young Her
A COMPARISION OF ACCURACY ON ORIFICE METER WITH AND WITHOUT STRAIGHTENER IN THE FIELD
The objective of this study is to improve the metering facilities at metering stations of Korea Gas Corporation (KOGAS), which are being operated in unsatisfying meter run conditions. For experiments, a test facility was constructed to simulate one of the metering stations and it was set up in Jung-dong metering station. Presently, KOGAS has 60 nationwide metering stations and among them, 34 metering stations are located in metropolitan area.
Tests were performed with both diameter ratio (<i>β = <i>d / <i>D) and flow rate variations and the test range of diameter ratio of orifice flow meter was from 0.3 to 0.7. The results showed that the error was - 7.2 % (maximum flow rate=3,661 Nm³/h) and - 3.1% (maximum flow rate=11,716 Nm³/h) for <i>β = 0.3 and 0.7, respectively without straightener. Thus, the diameter ratio was inversely proportional to the error, but on the contrary, the flow rate was proportional to the error. For the case of straghtener installation, the error showed 0.4 % (maximum flow rate = 3,030 Nm³/h) and 0.8% (maximum flow rate = 9,204 Nm³/h) for <i>β = 0.3 and 0.7, respectively. The error was not sensitive to the diameter ratio, but it was decreased when the flow rate was increased.