GB/T 21391-2008 Translated English of Chinese Standard (GBT 21391-2008, GB/T21391-2008, GBT21391-2008): Measurement of natural gas flow by turbine metershttps://www.chinesestandard.net, 6 mars 2017 - 51 sidor This standard specifies the measurement conditions, requirements, performance, installation, real-flow calibration and field inspection of gas turbine flow meter for natural gas flow measurement. |
Innehåll
| 3 | |
Measurement principle | 9 |
Installation requirements use and maintenance | 17 |
Flow calculation method and measurement uncertainty estimation | 23 |
Appendix A Normative Realflow calibration | 29 |
Appendix B Informative Other performance characteristics of flow meter | 41 |
Informative Example of natural gas flow calculation | 48 |
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Absolute static pressure accordance with GB/T Appendix arithmetic mean calculated in accordance calibrate the flow calibration certificate calibration conditions Calibration flow calibration pressure calibration results apply correction cubic meter kg/m3 downstream EFWM estimated in accordance filter or filter flow measurement uncertainty flow meter factor flow point flow regulator flow weighted mean Gas compression factor gas under standard gauge pressure hour m3/h inlet installation method integrated intelligent flow intelligent flow meter Intrinsic safety ith calibration point kilograms lubricant mass flow maximum allowable error measurement instrument megajoules megapascal minimum flow rate Molar mass natural gas flow nominal diameter operating conditions pipeline pressure loss pressure range pressure taps provisions of GB/T qmax Rangeability relative indication error requirements riser standard device standard reference conditions static pressure measurement straight pipe section Table A.1 Temperature tap thermodynamic temperature measurement turbine flow meter turbine impeller turbine meter upstream Valve optional vent valve weighted mean error