GB/T 18604-2014 Translated English of Chinese Standard. (GBT 18604-2014, GB/T18604-2014, GBT18604-2014): Measurement of natural gas flow by gas ultrasonic flow 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, 30. nóv. 2019 - 70 síður This Standard specifies measurement performance requirements of gas ultrasonic flow meters, flow meter body requirements, installation and maintenance, field verification test requirements, and flow calculation methods and measurement uncertainty estimates. |
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... thermodynamic temperature K t Time T s V Mean axial fluid velocity LT-1 m/s Average flow velocity along acoustic path LT-1 m/s X Axial distance L m Z Compression factor l φ Path angle l rad NOTE 1: In the measurement dimension, symbol L ...
... thermodynamic temperature K t Time T s V Mean axial fluid velocity LT-1 m/s Average flow velocity along acoustic path LT-1 m/s X Axial distance L m Z Compression factor l φ Path angle l rad NOTE 1: In the measurement dimension, symbol L ...
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... thermodynamic temperature. NOTE 2: The symbols not listed in the table are explained in the text. 3.2 Terms and definitions The following terms and definitions apply to this document. 3.2.1 transit-time difference method A gas flow ...
... thermodynamic temperature. NOTE 2: The symbols not listed in the table are explained in the text. 3.2 Terms and definitions The following terms and definitions apply to this document. 3.2.1 transit-time difference method A gas flow ...
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Efni
| 4 | |
Measurement principle | 10 |
Installation requirements and maintenance | 24 |
Annex A informative Fundamental principles | 35 |
normative Exitfactory testing requirements | 53 |
Annex G informative Monitoring and guarantee of onsite measurement | 67 |
Common terms and phrases
according to formula acoustic noise acoustic path acoustic pulse airflow Annex attenuation average flow velocity calculated according calculation under standard calibration coefficient compression factor cubic meters downstream straight pipe electronic components extended uncertainty flow calculation flow measurement flow points flow regulator flowmeter frequency gas ultrasonic flow GB/T hour m3/h inner diameter installation conditions ith calibration point Maximum peak-to-peak error measurement accuracy measurement performance requirements measurement uncertainty measuring instrument megapascals meter body multi-path gas ultrasonic natural gas flow noise source output parameters path length PetroChina piezoelectric pressure obtaining hole pressure regulating valve qmax qmax,facility qmin relative sound velocity Reynolds number serial communication serial number signal processing unit sound velocity deviation sound waves specified speed of sound standard device standard reference conditions Standard uncertainty straight pipe section technical requirements temperature measurement hole theoretical sound velocity thermodynamic temperature transiting ultrasonic flow meter ultrasonic transducer uncertainty of flow velocity distribution verification testing