GB/T 21391-2008 Translated English of Chinese Standard (GBT 21391-2008, GB/T21391-2008, GBT21391-2008): Measurement of natural gas flow by turbine meters [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]https://www.chinesestandard.net, 06 մրտ, 2017 թ. - 51 էջ 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. |
Բովանդակություն
| 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 |
Common terms and phrases
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 meters 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 installation conditions installation method integrated intelligent flow intelligent flow meter Intrinsic safety ith calibration point kilograms lubricant mass flow maximum allowable error measurement instrument megajoules megapascal meter is calibrated minimum flow rate Molar mass natural gas flow nominal diameter operating conditions pipeline pressure loss pressure range pressure taps 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 value of natural Valve optional vent valve weighted mean error