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JJG 640-2016

Chinese Standard: 'JJG 640-2016'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusRelated Standard
JJG 640-2016English919 Add to Cart Days<=5 Differential Pressure Flowmeters Valid JJG 640-2016
JJG 640-2016Chinese34 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]

   

BASIC DATA
Standard ID JJG 640-2016 (JJG640-2016)
Description (Translated English) Differential Pressure Flowmeters
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A53
Word Count Estimation 40,459
Date of Issue 2016-11-30
Date of Implementation 2017-05-30
Older Standard (superseded by this standard) JJG 640-1994
Drafting Organization China Institute of Metrology
Administrative Organization National Flow Capacity Measurement Technical Committee
Regulation (derived from) State Administration of Quality Supervision, Inspection and Quarantine Notice No.119 of 2016
Issuing agency(ies) State Administration of Quality Supervision, Inspection and Quarantine

JJG 640-2016
Differential Pressure Flowmeters
National Metrological Verification Regulation of the People's Republic of China
Differential pressure flowmeter
2016-11-30 release
2017-05-30 implementation
State Administration of Quality Supervision, Inspection and Quarantine issued
Differential pressure flow meter verification procedures
Replacing JJG 640-1994
Responsible Unit. National Traffic Capacity Measurement Technical Committee
The main drafting unit. China Institute of Metrology
Participated in the drafting unit. Tianjin Runtai Automation Instrumentation Co., Ltd.
Beijing Bo Sida New Century Measurement and Control Technology Co., Ltd
Liaoning Institute of Metrology
Dalian Sony Electronics Co., Ltd.
Shanghai Branch Yang Technology Co., Ltd
This procedure entrusts the National Flow Capacity Measurement Technical Committee to explain
The main drafters of this procedure.
Shi Zhendong (China Institute of Metrology)
Duan Huiming (China Institute of Metrology)
Participate in the drafters.
Tong Fu Lai (Tianjin Runtai Automation Instrumentation Co., Ltd.)
Zhang Zhili (Beijing Bo Sida New Century Measurement and Control Technology Co., Ltd.)
Wang Zhen (Liaoning Institute of Metrology)
Pang Shiqiang (Dalian Sony Electronics Co., Ltd.)
Zhou (Shanghai Ke Yang Technology Co., Ltd.)
table of Contents
Introduction (II)
1 range (1)
2 References (1)
3 Terms and definitions (2)
3.1 Terminology (2)
3.2 Units of measurement and symbols (3)
4 Overview (4)
4.1 Working principle (4)
4.2 Composition (4)
4.3 Classification (4)
4.4 Use (4)
5 Metrological performance requirements (5)
5.1 Geometric test method Measurement performance requirements (5)
5.2 coefficient test method measurement performance requirements (5)
5.3 indication error measurement method measurement performance requirements (5)
6 General technical requirements (6)
6.1 Random files (6)
6.2 Identification and nameplate (6)
6.3 Appearance (6)
7 Metering device control (6)
7.1 Geometry Detection (7)
7.2 coefficient detection method (12)
7.3 Indication error detection method (14)
7.4 Processing of Verification Results (15)
7.5 Verification cycle (16)
Appendix A Geometrical test method of measurement performance requirements (17)
Appendix B Outflow Coefficient Calculation Formula (31)
Appendix C Certificate of Verification and Verification Results Page Format (33)
introduction
This procedure is according to JJF1002-2010 "national measurement procedures for the preparation of rules", according to JJF1004 "flow
Metrological terminology and definition ", combined with China's differential pressure flow meter technology and the status quo to amend.
This procedure and JJG 640-1994 "differential pressure flowmeter" compared to the main changes are as follows.
- According to JJF1002-2010 "national measurement procedures for the preparation of rules" requirements, to determine the structure of the program,
Added an introduction to a reference file;
--- provides the differential pressure flow meter of the three test methods. In the original geometric detection method, the basis of coefficient detection method
, The new value of the error detection method;
--- According to GB 2624-2006 relative GB 2624-1993 changes, the new version of the geometric detection method
The diameter ratio of the standard throttle, the outflow coefficient and its uncertainty, the upper part of the throat of the upper part of the throat is required.
Have changed
--- clear the accuracy level of 0.5, 1, 1.5, 2, 2.5;
- In accordance with JJF1002-2010 "National Metrological Verification Rules for the preparation of rules" requirements, in Appendix C to
Out of the three test methods of the certificate/certificate results within the notice page format.
Prerequisites of this Code Release.
--- JJG 640-1994.
Differential pressure flow meter verification procedures
1 Scope
This procedure applies to the integration of differential pressure flowmeter and split differential pressure flow meter standard throttle and differential pressure device
Of the first test, follow-up test and use of the inspection.
2 reference file
This procedure refers to the following documents.
JJG 882 pressure transmitter
JJG 1003 flow totalizer
Standard Terminology and Definitions for JJF1001-2011
Flow meter noun terms and definitions
GB/T 2624.1-2006 Measurement of full flow of fluid with differential pressure devices installed in circular cross-section pipes
Part 1. General principles and requirements
GB/T 2624.2-2006 Measurement of full pipe flow with differential pressure devices installed in circular cross-section pipes
2 parts. orifice plate
GB/T 2624.3-2006 Measurement of full pipe flow with differential pressure devices installed in circular cross-section pipes
3 parts. nozzle and venturi nozzle
GB/T 2624.4-2006 Measurement of full pipe flow with differential pressure devices installed in circular cross-section pipes
4 parts. Venturi tube
ISO 5167-1..2003 Measurement of full flow of fluid with a differential pressure device installed in a circular cross-section pipe.
Section. General principles and requirements (Measurementoffluidflowbymeansofpressuredifferentialde-
vicesinsertedincircularcross-sectionconduitsrunningful-Part 1. Generalprinciples
andrequirements)
ISO 5167-2..2003 Measurement of full pipe fluid flow with differential pressure devices installed in circular cross-section pipes.
Partial. Orifice Plate (Measurementoffluidflow by means ofpressuredifferentialdevices
insertedincircularcross-sectionconduitsrunningful-Part 2. Orificeplates)
ISO 5167-3..2003 Measurement of full-pipe fluid flow with differential pressure devices installed in circular cross-section pipes.
Part. nozzle and venturi nozzle (Measurementoffluidflowbymeansofpressuredifferential
devicesinsertedincircularcross-sectionconduitsrunningful-Part 3. NozzlesandVen-
turinozzles
ISO 5167-4..2003 Measurement of full pipe flow with differential pressure devices installed in circular cross-section pipes.
Part. Venturi tube (Measurementoffluidflowbymeansofpressuredifferentialdevices
insertedincircularcross-sectionconduitsrunningful-Part 4. Venturitubes)
For dated references, only the dated edition applies to this rule; references that are not dated
, The latest version (including all amendments) applies to this procedure.
Related standard:   JJG 648-2017  JJG 649-2016
Related PDF sample:   JJG 646-2006  JJG 475-2008
   
 
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