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GB/T 30500-2014: Ultrasonic gas flow meter performance online audit -- Method using speed of sound checking
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GB/T 30500-2014: Ultrasonic gas flow meter performance online audit -- Method using speed of sound checking

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Ultrasonic gas flow meter performance online audit. Method using speed of sound checking ICS 75.18.30 E98 National Standards of People's Republic of China Gas Ultrasonic Flowmeter in-service inspection Speed \u200b\u200bof sound test method Issued on. 2014-02-19 2014-06-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Preface Ⅰ 1 Scope 1 2 Normative references 1 3 Terms, definitions and symbols 2 3.1 Terms and definitions 2 3.2 Symbols 2 Fundamentals 3 4 4.1 theoretical speed of sound 3 4.2 4 measuring the speed of sound Principle 4 4.3 speed of sound test method 5 Technical requirements 5 5.1 Gas Condition 5 5.2 gas composition measurements 5 5.3 pressure measurement 5 5.4 Temperature Measurement 5 5 5.5 Installation conditions 5.6 Technical requirements 5 6 6 Test the speed of sound 6.1 Measurement Condition 6 6.2 measuring device 6 Check before measuring 6.3 6 6.4 Measurement procedures 6 7 7 measurement results processing 7.1 Sound Velocity deviation calculation 7 7.2 The maximum sound velocity difference calculation 7 7.3 Repeatability calculation 7 8 8 test results 9 test interval 8 Appendix A (informative) of natural gas and other hydrocarbon gases to calculate the speed of sound 9 Information Appendix B (informative) ultrasonic flowmeter diagnosis 17

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. The standard reference in the drafting process of the American Gas Association Technical Report No. 9 (AGAReportNo.9) "multi-channel ultrasonic Flowmeter gas flow "(Measurementofgasbymultipathultrasonicmeters) and Technical Report No. 10 (AGAReportNo.10) "natural gas and other related hydrocarbon gas the speed of sound" (Speedofsoundinnaturalgasandother relatedhydrocarbongases) part of the content. The standard reference in the drafting process JJG1030-2007 "ultrasonic flowmeter." The main technical requirements and standards JJG1030-2007 main differences are as follows. --- Increase the basic principles of sound velocity test method; --- Clear technical requirements for speed of sound test method; --- Speed \u200b\u200bof sound operating procedures Inspection Act makes provisions; --- The speed of sound test results approach makes provisions; --- Appendix A "natural gas and other hydrocarbon gases to calculate the speed of sound," the main reference AGAReportNo.10 be written. This standard by the National Standardization Technical Committee of Oil and Gas (SAC/TC355) and focal points. This standard was drafted. large national oil and gas flow metering stations, large national oil and gas flow metering stations Nanjing sub-station, the National Stone Large oil and gas flow metering station sub-station in Chengdu. The main drafters of this standard. Xiaodi, Zheng Qi, Zhang Yuan, Gao Jun, paragraph following the celery, Mafu Jun, Guo Liang, into a dawn, in buildings. Gas Ultrasonic Flowmeter in-service inspection Speed \u200b\u200bof sound test method

1 Scope

This standard specifies the test method for sound velocity of ultrasonic gas flowmeter in-service inspection methods. This standard applies to the propagation time difference method for the principle, with self-diagnostic function plug-in gas ultrasonic flowmeter. Table 1 sets out the scope of the standard gas properties available. Table 1 Characteristics of the scope of compliance with this standard gas mixture Project Scope Mole fraction /% Methane 45.0 to 100.0 Nitrogen 0 to 50.0 Carbon dioxide 0 to 10.0 Ethane 0 to 10.0 Propane 0 to 4.0 Total butane 0-1.0 Total pentane 0-0.3 Six plus carbon 0-0.2 Helium 0-0.2 Hydrogen 0 to 10.0 Carbon monoxide 0-3.0 Water 0-0.05 Hydrogen sulfide from 0 to 0.02 Temperature/℃ -8 ~ 62 Pressure (absolute pressure)/MPa 0.2 ~ 12

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB 3836.1 explosive atmospheres - Part 1. General requirements for equipment GB 3836.2 explosive atmospheres - Part 2. the flameproof enclosure "d" protection equipment GB 3836.4 explosive atmospheres - Part 4. the intrinsically safe "i" protection equipment GB/T 13609 Gas sampling guidelines GB/T 13610 natural gas composition analysis by gas chromatography GB/T 18603 natural gas measurement system technical requirements ...