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Meter Measurement Accuracy at Conditions from ...

SKU: GRI-03/0172
Meter Measurement Accuracy at Conditions from Atmospheric Air to 700 psig Natural Gas

The objective of this report is to provide independent turbine meter performance data to support the planned revision of the American Gas Association (AGA) turbine meter standard, AGA Report No. 7. Eight commercial turbine meters were tested in natural gas and air to quantify changes in meter calibration with changes in line pressure.
Document Type
Report
Report Type
Topical Report
Report Period
01/03 - 12/03
Corporate Source
Southwest Research Institute, San Antonio, TX
Sponsor
GRI, Des Plaines, IL
Pagination
94p
Product Media
PDF Download
$495.00 / Each
 
Availability: In Stock
Summary:
The objective of this report is to provide independent turbine meter performance data to support the planned revision of the American Gas Association (AGA) turbine meter standard, AGA Report No. 7. Eight commercial turbine meters were tested in natural gas and air to quantify changes in meter calibration with changes in line pressure. Performance changes due to fluid drag (related to Reynolds number) and non-fluid drag (related to gas density) were quantified in flowing conditions ranging from atmospheric air to natural gas at 700 psig. For all eight meters, these maximum changes were within ±2.5% of reading at flow rates above 20% of the maximum flow rate of the meter. Midpoint K factors were also computed from data over all test conditions, to illustrate the errors that might be obtained from manufacturer calibrations. For three of the eight test meters, the uncertainties in these midpoint K factors were within ±1%, the accuracy allowed by the current version of AGA Report No. 7. For the remaining meters, the uncertainties in midpoint K factors were larger than the current AGA-7 limit. The calibration data from each of the meters were also compared to the performance requirements proposed for the upcoming revision to AGA-7. Four of the meters met all the proposed requirements for accuracy and variation in calibration factor with flow rate, while the other four meters met only some of these requirements. None of the meters met the requirements for calibration repeatability.
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