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GBZ44813-2024 English PDF

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US$769.00 · In stock
Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email.
GBZ44813-2024: Measurement of fluid flow in closed conduits - Effects of flow pulsations on flow-measurement instruments
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/Z 44813-2024	769	Add to Cart	6 days	Measurement of fluid flow in closed conduits - Effects of flow pulsations on flow-measurement instruments	Valid

Similar standards

GB/T 51033 GB/T 50082

Basic data

Standard ID: GB/Z 44813-2024 (GB/Z44813-2024)
Description (Translated English): Measurement of fluid flow in closed conduits - Effects of flow pulsations on flow-measurement instruments
Sector / Industry: National Standard
Classification of Chinese Standard: N12
Classification of International Standard: 17.120.10
Word Count Estimation: 38,394
Date of Issue: 2024-10-26
Date of Implementation: 2025-05-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/Z 44813-2024: Measurement of fluid flow in closed conduits - Effects of flow pulsations on flow-measurement instruments

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBZ44813-2024
GB /Z 44813-2024.Measurement of fluid flow in closed conduits - Effects of fluid pulsation on flow measuring instruments ICS 17.120.10 CCSN12 Guiding Technical Documents of National Standardization of the People's Republic of China Measurement of fluid flow in closed pipes The influence of fluid pulsation on flow measurement instruments instruments,MOD) Released on October 26, 2024 Implementation on May 1, 2025 State Administration for Market Regulation The National Standardization Administration issued

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Symbols and subscripts 2 4.1 Symbol 2 4.2 Subscripts and Superscripts 3 5 Description and detection of pulsating flow 4 5.1 Properties of Pipeline Fluids 4 5.2 The threshold between steady flow and pulsating flow 4 5.3 Causes of pulsation 5 5.4 Conditions for pulsating flow in industrial and laboratory flow devices 5.5 Detection of pulsation and determination of frequency, amplitude and waveform 6 6 Measurement of average flow rate of pulsating flow 8 6.1 Orifice plates, nozzles and venturi tubes 8 6.2 Turbine flowmeter 15 6.3 Vortex Flowmeter 19 Appendix A (Informative) Orifice Plate, Nozzle and Venturi Tube --- Theoretical Analysis 21 A.1 Overview 21 A.2 Derivation of the equation relating flow indication error to pulsation amplitude 21 A.3 Error of flow indication 21 A.4 Quasi-stable time-inertia theory 21 A.5 Predicting Flow Characteristics in Pulsating Flow Using Computational Fluid Dynamics (CFD) 23 Appendix B (Informative) Orifice Plates, Nozzles, and Venturi Tubes—Pulsation Damping Criteria 26 B.1 Introduction 26 B.2 Theoretical Analysis of Sufficient Damping - Subsonic Flow in Throttling Devices 26 Appendix C (Informative) Turbine Flowmeter --- Theoretical Background and Experimental Data 29 C.1 Equations of motion for unsteady flows 29 C.2 Prediction of pulsation error 29 C.3 Development of software diagnostic tools 30 Reference 32 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is modified to adopt ISO /T R3313.2018 “Measurement of fluid flow in closed pipes – Effect of fluid pulsation on flow measuring instruments” The document type was adjusted from ISO 's technical report to my country's national standardization guidance technical document. The technical differences between this document and ISO /T R3313.2018 and their reasons are as follows. --- Added the dimensions and SI units of the symbols listed in the symbol table for ease of use (see 4.1). --- Changed the description of the symbol "d" in the symbol table, because the meaning of "d" in this document also includes the diameter of the bluff body of the turbine flowmeter (See 4.1). --- Changed the description of "α" in the symbol table and "α" in the illustrations of Figures A.1 and A.2 because the interpretation of the symbol in this document is not correct. The "α" in the symbol table is consistent with the "α" in 6.2.1.2 and Appendix A, and is modified to (qVmin-qVmax)/(2qV). The “α” in the legend of Figures A.1 and A.2 is the same as that in 5.2.2 U'RMS Same, use U'RMS directly Replacement (see 4.1, A.5). --- Changed the description of "B" in the symbol table and "B" in Appendix B. Because different interpretations of "B" appear in this document, the symbol The "B" in the table is consistent with the "B" in 6.2.1.2 and Appendix C, and is modified to bfp/qV. The "B" in the formula in Appendix B is modified to B*, where B*= le qm Δpss (See 4.1, B.2). ---Change C to C* and L to L* in formula (27). Because the two symbols in this formula represent capacitance and inductance respectively, they are different from C in the symbol table. The meaning of "L" is inconsistent with that of "L", so a new symbol is given to distinguish it (see 6.1.4.1.3). The following editorial changes have been made to this document. ---Change the name of the document to "Measurement of Fluid Flow in Closed Pipes - Effects of Fluid Pulsation on Flow Measuring Instruments"; --- For ease of use, relevant notes are added to the text (see 5.1, A.5); --- Add the marking and diagram of the flow meter in Figure 1 (see 6.1.4.1.1); --- Change the symbol “f” in the Strouhal number formula in Appendix A to “fp” (see Appendix A). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Industrial Process Measurement, Control and Automation (SAC/TC124). This document was drafted by. Shanghai Industrial Automation Instrumentation Research Institute Co., Ltd., Tianjin University, Guangzhou Energy Testing Institute, Jinka Smart Group Co., Ltd., Kaifeng Instrument Co., Ltd., Zhejiang Institute of Metrology, Beijing Institute of Metrology and Testing, Hangzhou Pangu Automation Systems Co., Ltd., Metso Instruments (Changzhou) Co., Ltd., Endress+Hauser (China) Automation Co., Ltd., Tianxin Instrument Group Co., Ltd., Chengdu Qinchuan Internet of Things Technology Co., Ltd., Jiangsu Xinhui Measurement and Control Technology Co., Ltd., Hebei Provincial Metrology Supervision and Inspection Research Institute, Jiangsu Institute of Metrology, Xiamen Yudian Automation Technology Co., Ltd., Yinchuan Rongshenwei Automation Instrument Factory (Co., Ltd.), Beijing Far East Instrument Co., Ltd., Jiangsu Jack Instrument Co., Ltd., Hubei Nankong Instrument Technology Co., Ltd., Chongqing Derun Automation Equipment Co., Ltd. Hefei Jingda Instrument Co., Ltd., Shanghai Enbang Automation Instrument Co., Ltd., and China National Petroleum and Natural Gas Pipeline Network Co., Ltd. West-East Gas Pipeline Branch. The main drafters of this document are. Xiao Honglian, Sun Yuxin, Lu Jiamin, Xu Ying, Ding Yuanming, Hai Ning, Chen Shangshun, Yang Youtao, Zheng Mingdu, Tian Peng, Zhang Yuncai, Tao Chaojian, Liang Yongzeng, Wang Yuxiang, Liu Weiguang, Niu Lina, Cao Jiuying, Su Xiaoli, Tang Linan, Yuan Chao, Deng Jun, Min Xinyi, Guan Rongtao, Gong Daoxia, Qiao Jiayi, Liu Jie, Zhang Jinhua, and Liu Zhe. Measurement of fluid flow in closed pipes The influence of fluid pulsation on flow measurement instruments 1 Scope This document defines pulsating flow, compares it to steady flow, gives its detection method, and describes the use of orifice plates, nozzles, When measuring fluid in a pipeline using a venturi tube, turbine flowmeter or vortex flowmeter, the influence of pulsating flow on these instruments is discussed in this document. These types of flow meters are susceptible to pulsating flow. When correction is not possible, this document also provides methods to avoid or reduce the pulsation effect. These measures include installing pulsation damping devices and/or selecting flow meters that are not susceptible to pulsation. This document applies to fluids that generate pulsations from a single source upstream or downstream of the flowmeter primary device. The flow direction is not reversed, but there is no restriction on the pulsation waveform. This document is applicable to both liquid and gas flows. For gas flows, This can be limited to situations where the density changes within the measuring section of a specific type of flow meter are small. 2 Normative references This document has no normative references. 3 Terms and Definitions The following terms and definitions apply to this document. The URLs for terminology databases used for standardization maintained by ISO and IEC are as follows. 3.1 steadyflow Flows for which parameters such as velocity, pressure, density and temperature do not vary significantly with time so as to affect the required measurement uncertainty. 3.2 pulsating flow The flow rate in the measuring section is a function of time, but when averaged over a sufficiently long period, has a constant average value and is dependent on the pulsation pattern. The flow of law. Note 1.Pulsating flow can be divided into two categories. ---Periodic pulsating flow; ---Random pulsating flow. NOTE 2 For detailed descriptions of steady flow and pulsating flow, see 5.1 and 5.2. NOTE 3 Unless otherwise specified in this document, the term "pulsating flow" is used to describe periodic pulsating flow. ......

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Question 1: How long will the true-PDF of GBZ44813-2024_English be delivered?

Answer: Upon your order, we will start to translate GBZ44813-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 6 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GBZ44813-2024_English with my colleagues?

Answer: Yes. The purchased PDF of GBZ44813-2024_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.