Elevated pressure performance of diaphragm meters - an MRF program
- Southwest Research Inst., San Antonio, TX (United States)
Diaphragm meter data were acquired in the Gas Research Institute (GRI) Metering Research Facility (MRF) at elevated pressures to evaluate volume flow rate bias errors (if present), relative to ANSI B109.1 (1) and ANSI B109.2 (2) specifications, that may be induced as a result of the pressure conditions. Simultaneous pressure drop data were acquired in order to verify the ANSI General Service Capacity Equation predictions, which are used to scale meter flow capacity from one operating condition to another. Results showed that diaphragm meters will repeat well within the ANSI accuracy specification of {plus_minus}1.0%, but do show pressure dependent biases. Above 20-50% full scale, some small diaphragm meters tested on natural gas showed biases with dynamic pressure, amounting to 0.5% error at full scale, over the range of allowable pressures. large diaphragm meters tested on nitrogen did not show pressure dependent biases greater than the {plus_minus}1.0% specification. Below 20-50% full scale, some diaphragm meters showed an apparently random pressure effect. The ANSI General Service Capacity Equation does not accurately predict meter performance, and will produce pressure dependent errors up to over +60% in predicted capacity. An alternative model, which accurately matches MRF data, is presented.
- OSTI ID:
- 443544
- Report Number(s):
- CONF-950391-; TRN: 96:005694-0002
- Resource Relation:
- Conference: 3. international symposium on fluid flow measurement, San Antonio, TX (United States), 20-22 Mar 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the fluid flow measurement; PB: 837 p.
- Country of Publication:
- United States
- Language:
- English
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