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Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25922-2023: Measurement of fluid flow in closed conduits - Flowrate measurement by means of vortex shedding flowmeters inserted in circular cross-section conduits running full Status: Valid GB/T 25922: Historical versions
Basic dataStandard ID: GB/T 25922-2023 (GB/T25922-2023)Description (Translated English): Measurement of fluid flow in closed conduits - Flowrate measurement by means of vortex shedding flowmeters inserted in circular cross-section conduits running full Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: N12 Classification of International Standard: 17.120.10 Word Count Estimation: 26,281 Date of Issue: 2023-08-06 Date of Implementation: 2024-03-01 Older Standard (superseded by this standard): GB/T 25922-2010 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 25922-2023: Measurement of fluid flow in closed conduits - Flowrate measurement by means of vortex shedding flowmeters inserted in circular cross-section conduits running full---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. ICS 17.120.10 CCSN12 National Standards of People's Republic of China Replace GB/T 25922-2010 Measurement of fluid flow in closed pipes Installed in a circular cross-section pipe filled with fluid Vortex flowmeter measures flow (ISO 12764.2017,IDT) Published on 2023-08-06 2024-03-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee Table of contentsPreface III Introduction IV 1 Scope 1 2 Normative reference documents 1 3 Terms and Definitions 1 3.1 Terminology specific to this document 2 3.2 Terminology related to fluid flow measurement in closed pipes3 3.3 Terminology related to metrology 3 4 symbols and subscripts 4 4.1 Symbol 4 4.2 Subscript 5 5 Principle 5 5.1 Bluffing body 5 5.2 Separation vortex detection/sensitive element 6 5.3 Strohal number 6 6 Flowmeter Description7 6.1 Physical composition 7 6.2 Flag 8 6.3 Security issues 8 7 Instructions for use 8 7.1 Caliber 8 7.2 Pressure loss and cavitation 9 7.3 Vortex flows and underdeveloped flow profiles 9 7.4 Flow stability9 7.5 Vibration 9 8 Installation10 8.1 General 10 8.2 Installation location 10 8.3 Installation piping requirements10 9 operations 12 9.1 Working conditions12 9.2 Operation procedures 12 9.3 Calibration offset12 9.4 Maintenance12 10 Performance Features 12 10.1 Reynolds number range 12 10.2 Pressure-temperature conditions 12 10.3 Factors affecting performance12 11 Calibration (determination of K coefficient) 13 11.1 Average K coefficient 13 11.2 On-site calibration 13 Appendix A (informative) Periodic fluctuations and their impact on calibration 14 Appendix B (informative) Special precautions regarding steam 15 B.1 Types of steam15 B.2 Measurement of steam 16 B.3 Installation 16 B.4 Application 17 B.5 Potential risks of steam pipelines17 Reference 19ForewordThis document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document replaces GB/T 25922-2010 "Measurement of fluid flow in closed pipes using circular cross-section pipes filled with fluid." Method of measuring flow with vortex flowmeter in the channel. Compared with GB/T 25922-2010, in addition to structural adjustments and editorial changes, the main The technical changes are as follows. ---Deleted the terms "range", "minimum local pressure", "response time" and "decay" (see 3.4, 3.7, 3.11,.2010 version) 3.12); ---Added the content of integrated temperature and pressure sensitive components in the flow meter components (see 6.1.1.4); ---Added the specific content of instrument output (see 6.1.2); ---Added content regarding the length of upstream and downstream straight pipe sections required for installation pipelines (see 8.3.1); ---Deleted the requirement that the flow meter should be installed coaxially with the pipeline (see 8.2.3 of the.2010 edition); ---Deleted the requirement for multi-pipeline installation (see 8.2.4 of the.2010 edition); --- Added requirements to consider the impact of valve type on fluid pressure (see 8.3.3); ---Deleted the requirement for flow meter overpressure protection (see 8.2.9 of the.2010 edition); --- Added requirements for the installation location of electronic devices (see 8.3.7); --- Added requirements for the installation orientation of the bluff body (see 8.3.8); ---Deleted the requirement for flow regulator (see 8.3 of the.2010 version); ---Added flow meter maintenance requirements (see 9.4). This document is equivalent to ISO 12764.2017 "Measurement of fluid flow in closed pipes using circular cross-section pipes filled with fluid." Vortex flowmeter measuring flow in the channel. This document has made the following minimal editorial changes. ---Added 6.2 note. Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents. This document is proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Industrial Process Measurement Control and Automation Standardization Technical Committee (SAC/TC124). This document was drafted by. Shanghai Industrial Automation Instrument Research Institute Co., Ltd., Xi'an Ansen Intelligent Instrument Co., Ltd., Hefei Jing Large Instrument Co., Ltd., Beijing Institute of Metrology and Testing, Jiangsu Institute of Metrology, Tianxin Instrument Group Co., Ltd., Kai Feng Instrument Co., Ltd., Yuyao Yinhuan Flow Co., Ltd., Ningbo Water Meter (Group) Co., Ltd., Qingdao Automation Instrument Co., Ltd., Fujian Shunchang Hongrun Precision Instrument Co., Ltd., Jiangsu Huaxia Instrument Co., Ltd., Jiangsu Jack Instrument Co., Ltd., Shanghai Xipai Automation Technology Co., Ltd., Hebei Xiong'an Changhe Technology Co., Ltd., Jiangsu Suyi Group Co., Ltd., Dandong Tongbo Electrical Appliance (Group) Co., Ltd., He Northern Provincial Institute of Metrology Supervision and Inspection, Endress+Hauser (China) Automation Co., Ltd., Beijing Fisherport Technology Development Co., Ltd., Beijing Ruipu Sanyuan Instrument Co., Ltd., Shenzhen Wanxun Automatic Control Co., Ltd., Bitopa Technology Co., Ltd., Sinopec Zhongyuan Petroleum Engineering DESIGN LIMITED. The main drafters of this document. Wang Jianing, Li Minghua, Wang Shixing, Liu Jie, Yang Youtao, Cao Jiuying, Sun Zhipeng, Jin Wenzhe, Zhu Jiashun, Yao Ling, Yang Weishan, Chen Zhiyang, Yang Yushan, Chen Shumin, Wang Jizhong, Zhang Liangliang, Liu Liang, Guo Yonggang, Yu Wei, Jiang Yi, Wang Yuesheng, Zhang Jinhua, Zou Jing, Wang Zhonghui, Li Yingwei, Sun Yuxin, Zhu Weining, Liu Tao. This document was first published in.2010 and this is the first revision.Introduction"Vortex flowmeter" is also called "vortex flowmeter", which covers a large number of devices with different patented designs. These devices can be started from a Vortices are separated by obstacles (called bluff bodies) intentionally placed in the flow path of the flow meter. The natural laws of physics prove the vortex separation frequency (f) It is related to the flow rate of the fluid, and thus to the volume flow rate (qV) of the fluid in the pipeline. Accumulation can be obtained by accumulating the number of vortices within a specified time. flow. The phenomenon of vortex separation has become a recognized basis for fluid flow measurement. Vortex flowmeters are used to measure everything from cryogenic liquids to steam and high-pressure gases. body fluid flow. Many vortex flowmeter designs are patented and therefore their design details cannot be covered in this document. This document collects and analyzes limited data to illustrate the expected uncertainty ranges for this type of vortex flowmeter. Measurement of fluid flow in closed pipes Installed in a circular cross-section pipe filled with fluid Vortex flowmeter measures flow1 ScopeThis document. a) Describes methods of measuring liquid, gas and steam flow rates using vortex flowmeters, giving terminology and a series of criteria for determining performance. formula; b) Provides technical information that helps users select and use vortex flowmeters, including information on influencing quantities; c) Describes the typical structure of a vortex flowmeter and provides recommendations for inspection, certification and material traceability; d) Describes the practicality of vortex flowmeter diagnostic techniques; e) Calibration guidelines are provided; f) Not applicable to insertion vortex flowmeter; g) Applicable only to closed full pipelines; h) Applicable only to stable or slowly changing fluid flow over time; i) Applies to fluids considered to be single phase.2 Normative reference documentsThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document. Note. GB/T 17611-1998 Measurement terms and symbols for fluid flow in closed pipes (ISO 4006.1991, IDT) ISO /IEC Guide99.2007(JCGM200.2012) International Basic Terminology of Metrology (VIM) [Internationalvo-3 Terms and definitionsThe following terms and definitions as defined in ISO 4006 and ISO /IEC Guide99.2007 (JCGM200.2012) apply to this document. document. ISO and IEC maintain standardized terminology databases at. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25922-2023_English be delivered?Answer: Upon your order, we will start to translate GB/T 25922-2023_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 25922-2023?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 25922-2023 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
