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JJG 667-2010 English PDF (JJG667-2010)

JJG 667-2010 English PDF (JJG667-2010)

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JJG 667-2010: Verification regulation of liquid positive displacement flowmeter

This Regulation applies to type evaluation, initial verification, subsequent verification, and in-service inspection of liquid positive displacement flowmeter.
JJG 667-2010
National Metrological Verification Procedures
of the People's Republic of China
Liquid Positive Displacement Flowmeter
Issued by. Administration of Quality Supervision, Inspection and
This Regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China on September 06, 2010 and was implemented on March 6, 2011.
Jurisdiction organization. National Technical Committee of Flow Capacity Measurement Main drafting organization. National Institute of Metrology
Participating organizations. Henan Province Institute of Metrology
Beijing Institute of Metrology
Liaoning institute of Measurement
Anhui Institute of Metrology
Shandong Institute of Metrology
SINOPEC Pipeline Storage and Transportation Branch
National Technical Committee of Flow Capacity Measurement is responsible for the interpretation of this Regulation.
Verification Regulation of Liquid
Positive Displacement Flowmeter JJG 667-2010
Replacing JJG 67-1997
Main drafters of this Regulation.
Cui Lishui (National Institute of Metrology)
Participating drafters.
Zhu Yonghong (Henan Province Institute of Metrology)
Yang Youtao (Beijing Institute of Metrology)
Chen Mei (Liaoning institute of Measurement)
Sun Xiuliang (Anhui Institute of Metrology)
Ji Jianying (Shandong Institute of Metrology)
Lv Weiping (SINOPEC Pipeline Storage and Transportation Branch)
Table of Contents
1 Scope ... 5
2. Cited references ... 5
3 Terms and definitions ... 5
4 Overview ... 6
5 Metrological performance requirements ... 7
6 General technical requirements ... 7
7 Control of measuring instruments ... 9
Annex A ... 18
Type Evaluation Program of Liquid Positive Displacement Flowmeter ... 18 Annex B... 27
Calculation on Verification of Positive Displacement Meter by Pipe Prover Method ... 27
Annex C... 28
Format of Inner Pages of Verification Certificate ... 28
Annex D... 29
Format of inner pages of notice of verification result ... 29
Verification Regulation of Liquid Positive Displacement
1 Scope
This Regulation applies to type evaluation, initial verification, subsequent verification, and in-service inspection of liquid positive displacement flowmeter (hereinafter referred to as flowmeter).
2. Cited references
Provisions contained in following standards and regulations become provisions of this Regulation by citing.
GB 3836.1-2000 Electrical apparatus for explosive gas atmospheres - Part 1. General requirements
GB 3836.2-2000 Electrical apparatus for explosive gas atmospheres - Part 2. Flameproof enclosure d
GB 3836.3-2000 Electrical apparatus for explosive gas atmospheres - Part 3. Increased safety e
GB/T 17288-2009 Liquid hydrocarbons - Volumetric measurement by displacement meter systems
GB/T 17612-1998 Measurement of liquid flow in closed conduits - Weighing method JJF 1001-1998 General Terms in Metrology and Their definitions
JJF 1004-2004 Metrological Terms and Their Definitions for Flow Rate
JB/T 9242-1999 General technical specifications for positive displacement flowmeter JB/T 10564-2006 Basic parameters for flow measuring instruments
OIML R120-1996 Standard capacity measures for testing measuring systems or liquids other than water
It shall pay attention to use current valid versions of above cited references. 3 Terms and definitions
3.1 Liquid positive displacement flowmeter
Meter composed of chamber with a known volume and moving parts that are driven by liquid. It is used to measure fluid flow based on the number of times that the chamber is repeatedly filled-discharged of liquid.
3.2 Coefficient K
Number of pulses that is emitted by flowmeter when liquid of unit volume flows through the flowmeter.
3.3 Meter factor
Coefficient that flowmeter indicating value is corrected after verification. The value of which is the ratio of standard device indicating value and flowmeter indicating value, expressed by symbol F.
4 Overview
4.1 Working principles
Liquid will generate a certain pressure between flowmeter inlet and outlet when passing through flowmeter. Moving parts will move this pressure difference and discharge the liquid from inlet to outlet. In this process, chamber of flowmeter is repeatedly filled with liquid. Volume of this chamber is definite under given conditions; accumulated volume flow rate may be obtained as long as the number of movements of moving parts is measured. 4.2 Classification
Flowmeters referred in this Regulation include the following ones.
a) Waist wheel (also known as roots) flowmeter
b) Oval gear flowmeter
c) Sliding vane flowmeter
d) Rotary piston flowmeter
e) Reciprocating piston flowmeter
f) Disc flowmeter
g) Screw flowmeter
h) Double-rotor flowmeter
i) Other types of positive displacement meters
c) Manufacturing serial number
d) Manufactured measuring instrument license logo and number
e) Nominal diameter
f) Flow range
g) Maximum working pressure
h) Accuracy class
i) Explosion-proof grade and explosion-proof certificate number (applicable to explosion-proof meter)
j) Protection grade (used for outdoor installation)
k) Manufacture year and month
And other relevant technical indicators.
6.2.3 Flowmeter shall have seal-applied mechanism.
6.2.4 If flowmeter has supporting auxiliary mechanism, the auxiliary mechanism shall have following marks.
a) Manufacturer?€?s name and (or) factory logo
b) Name and model
c) Manufacturing number
d) Supporting flowmeter number (only applicable to dedicated auxiliary mechanism), etc.
6.3 Appearance
6.3.1 Flowmeter shall look good; sealing surface shall be smooth and without damage. 6.3.2 Marks shall be correct, distinct and clear.
6.3.3 Protective glass of indicating mechanism with a dial shall be free of bubbles, cracks, apparent scratches, and other detects that may affect readings and appearances. 6.3.4 Indicating mechanism of having digital wheels shall have clear figures, correct position and normally operating character wheel; and cannot have clamping stagnation phenomenon.
6.3.5 Indicating mechanism with electrical display shall have regular eye-catching numbers verification at any point of test piping system and flowmeter shall be higher than the saturated vapor pressure. For easily vaporized liquid, there shall be a certain back- pressure at downstream of flowmeter. Recommended back-pressure is 2 times flowmeter pressure loss at maximum flow rate plus 1.25 times saturated vapor pressure of liquid for verification at maximum verification pressure.
7.1.6 Liquid for verification Liquid for verification shall be clean and free of particles, fibers and other substances. Test pipeline shall be full of liquid; liquid shall not be mixed with gases. During one-time verification, temperature variation of verification medium shall not exceed ??0.5??C.
7.1.7 Viscosity of liquid Viscosity of liquid shall be consistent with the viscosity of actually measured by flowmeter to the greatest extent. When other liquids are adopted, error of flowmeter from the difference between liquid for verification and actually measured viscosity of liquid generally shall not exceed 1/3 of maximum permissible error of flowmeter. If the viscosity of working fluid of flowmeter is not greater than 2 mPa ?€? s, or accuracy class is not higher than grade 0.5 (including grade 0.5), and viscosity of liquid for work is not greater than 5 mPa ?€? s; under the premise without causing flowmeter corrosion and damage, it is allowed to use water for verification. If the viscosity of working liquid of flow meter is (5~50) mPa?€? s, the viscosity of liquid for verification shall not be less than 5 mPa ?€? s, and the difference with the viscosity of working fluid of flow meter shall be generally not greater than 9 mPa ?€? s. If the viscosity of working liquid of flowmeter is greater than 50 mPa ?€? s, then the viscosity of liquid for verification is only required to be not less than 50 mPa ?€? s. If one set of flowmeter is used to measure liquids of various viscosities, respectively use liquids with applicable minimum (or near minimum) and maximum (or near maximum) viscosities for verification. When the liquid for verification cannot meet the provisions of article, viscosity correction may be carried out based on viscosity correction formul...

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