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JJG 643-2024 English PDF

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JJG 643-2024: Flow Standard Facilities by Master Meter Method
Status: Valid

JJG 643: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 643-2024English379 Add to Cart 4 days [Need to translate] Flow Standard Facilities by Master Meter Method Valid JJG 643-2024
JJG 643-2003English519 Add to Cart 3 days [Need to translate] Verification Regulation of Flow Standard Facilities by Master Meter Method Obsolete JJG 643-2003
JJG 643-1994English519 Add to Cart 4 days [Need to translate] V. R. of Flow Standard Facilities by Master Meter Method Obsolete JJG 643-1994
JJG 643-1990EnglishRFQ ASK 3 days [Need to translate] Verification Regulation of Spherical Metal Tank Capacity Obsolete JJG 643-1990

Basic data

Standard ID JJG 643-2024 (JJG643-2024)
Description (Translated English) Flow Standard Facilities by Master Meter Method
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 18,157
Date of Issue 2024-02-07
Date of Implementation 2024-08-07
Issuing agency(ies) State Administration for Market Regulation

JJG 643-2024: Flow Standard Facilities by Master Meter Method

---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.
National Metrology Verification Regulations of the People's Republic of China Standard meter flow standard device Released on 2024-02-07 2024-08-07 Implementation The State Administration for Market Regulation issued Verification procedures for flow standard devices using standard meter method Replace JJG 643-2003 Responsible unit. National Flow Measurement Technical Committee Main drafting unit. China National Institute of Metrology Jiangsu Institute of Metrology Participating in the drafting. Beijing Institute of Metrology and Testing Science Dandong Lanxin Electric Co., Ltd. Yantai Zhonglong Instrument Co., Ltd. Dandong Beite Automation Engineering Instrument Co., Ltd. This regulation is entrusted to the National Flow Measurement Technical Committee for interpretation The main drafters of this regulation are. Shi Zhendong (China Institute of Metrology) Duan Huiming (China National Institute of Metrology) Huang Zhaohui (Jiangsu Institute of Metrology) Participating drafters. Li Peng (Beijing Institute of Metrology and Testing Science) Li Dongjun (Dandong Lanxin Electric Appliance Co., Ltd.) Wang Xiting (Yantai Zhonglong Instrument Co., Ltd.) Zhong Lin (Dandong Beite Automation Engineering Instrument Co., Ltd.)

Table of contents

Introduction (II) 1 Scope(1) 2 References(1) 3 Terminology and units of measurement (1) 3.1 Terminology (1) 3.2 Symbols, dimensions and units of quantities (1) 3.3 Units of measurement (3) 4 Overview(3) 4.1 Application and working principle (3) 4.2 Structure (4) 5 Metrological performance requirements (4) 5.1 Accuracy level (4) 5.2 Measurement of fluid temperature and pressure (4) 5.3 Timer(5) 5.4 Detection and control system (5) 5.5 Flow stability (5) 6 General technical requirements(5) 6.1 Standard table (5) 6.2 Fluid conditions(5) 6.3 Pipeline conditions (5) 6.4 Sealing (5) 6.5 Flow calibration software system (5) 7 Measuring instrument control (6) 7.1 Verification conditions (6) 7.2 Verification items and verification methods (6) 7.3 Verification result processing (10) 7.4 Verification cycle (10) Appendix A Verification Certificate/Verification Result Notice (Inner Page) Format (11)

Introduction

This regulation is based on JJF1002-2010 "Rules for the Preparation of National Measurement Verification Regulations" and JJF1004 "Flow Based on the technical level and current status of the standard flow meter flow standard device in my country, this paper JJG 643-2003 "Standard Meter Method Flow Standard Device" was revised. Compared with JJG 643-2003, the main changes in this regulation are as follows. --- Change "non-fixed point use" to "fixed flow range use" (see 3.1.2, 2.2 of the.2003 edition); ---Added the accuracy level of the standard flow standard device and the repeatability of the standard table at a fixed flow point. Meet the requirements of Table 2 (see Table 2 in 5.1.1); ---Added the accuracy level of the standard flow standard device of the standard table method to be repeated with the standard table within a fixed flow range The error range of linear fitting should meet the requirements of Table 3 (see Table 3 in 5.1.2); ---Change "The pressure measurement position should be upstream of the flow meter" to "The pressure measurement position should generally be upstream of the standard table and upstream of the flowmeter to be tested. When the standard meter and the flowmeter to be tested are vortex flowmeters, the pressure measurement position should be below them. Tour” (see 6.3.5,.2003 edition 5.2.5); --- Change "There should be no leakage at the joints of the components of the standard device under working pressure" to "At working pressure The joints of the components of the standard flow meter standard device under pressure should not leak" (see 6.4, 5.3 of the.2003 edition); --- Increased flow stability. ≤0.5% (see 5.5); --- The expanded uncertainty of the flow standard device used to calibrate the standard flow meter should be better than the expanded uncertainty of the standard flow meter. The accuracy level (or expanded uncertainty) of the flow standard device at the next higher level shall not exceed 1/3” of the accuracy level (or expanded uncertainty) of the flow standard device using the standard meter method (see 7.1.1.1,.2003 Version 6.1.1.3); --- The expanded uncertainty of the standard timer used to calibrate the timer should be better than the expanded uncertainty of the timer. "The standard timer used to verify the timer should have a valid verification certificate or calibration certificate, and its relative error should be The absolute value should not exceed 3.34×10-5” (see 7.1.1.2, 6.1.1.4 of the.2003 edition); ---Change "start the control device to make the fluid flow in the pipeline" to "start the control device to make the fluid flow in the pipeline" The flow rate of the standard meter flow standard device flows at the maximum working pressure for 5 minutes" (see 7.2.3,.2003 edition 6.2.2); --- The standard flowmeter used at non-fixed points should be more than the calibration points of similar flowmeters within the full range; each point "Calibrate once" is changed to "Standard table for fixed flow range, there should be no less than 10 flow points within the flow range, Each flow point shall be calibrated no less than 6 times” (see 7.2.4.1, 6.2.3.1 of the.2003 edition); --- Added the calculation formula of the standard table flow and K coefficient (or cumulative flow relative error) fitting function [See formula (12), formula (15)]. The previous versions of this regulation are as follows. ---JJG 643-2003; ---JJG 643-1994. Verification procedures for flow standard devices using standard meter method

1 Scope

This regulation applies to standard gas flow standard devices other than critical flow Venturi nozzle flowmeters used as standard meters. Initial calibration, subsequent calibration and in-use inspection of quasi-meter flow standard devices.

2 References

This specification refers to the following documents. JJG 633 Gas Volumetric Flow Meter JJG 667 Liquid Positive Displacement Flow Meter JJG 1029 Vortex Flowmeter JJG 1033 Electromagnetic Flow Meter JJG 1037 Turbine Flow Meter JJG 1038 Coriolis mass flow meter JJF1004 Flow measurement terms and definitions GB 50251 Code for Design of Gas Pipeline Engineering For any referenced document with a date, only the version with the date is applicable to this Regulation; for any referenced document without a date, The latest version (including all amendments) shall apply to this regulation.

3 Terminology and units of measurement

3.1 Terminology The flow rate of the standard meter method flow standard device is determined according to the calibration flow point of the standard meter. The flow rate of the standard meter method flow standard device is determined according to the calibration flow range of the standard meter. 3.2 Symbols, dimensions and units of quantities The symbols, dimensions and units of quantities are shown in Table 1. Table 1 Symbols, dimensions and units of quantities Symbolic Dimensional Unit Kij The coefficient of the jth calibration at the i-th calibration flow point in the standard table L-3 1/m3 Nij The number of pulses accumulated during the jth calibration at the i-th calibration flow point in the standard table. Dimensionless --- (Qs)ij The cumulative volume given by the flow standard device at the jth calibration at the i-th calibration flow point in the standard table Flow rate L 3 m3 (Qsm)ij The flow standard device is converted to the standard table at the i-th calibration flow point when the j-th calibration The cumulative volume flow rate L 3 m3

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