JJG 1037-2008 PDF in English
JJG 1037-2008 (JJG1037-2008) PDF English
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Verification Regulation of turbine Flowmeter
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JJG 1037-2008: PDF in English JJG 1037-2008
JJG
NATIONAL METROLOGICAL VERIFICATION
REGULATION OF THE PEOPLE’S REPUBLIC OF CHINA
Turbine Flowmeter
ISSUED ON. MARCH 25, 2008
IMPLEMENTED ON. JUNE 25, 2008
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China
Verification Regulation of Turbine Flowmeter
Replacing turbine flowmeter part in JJG 198-1994
The Regulation has been approved by General Administration of Quality Supervision,
Inspection and Quarantine of the People’s Republic of China on March 25, 2008, and
has been implemented since June 25, 2008.
Jurisdictional organization.
National Technical Committee on Flow Capacity Measurement
Main drafting organization.
National Institute of Metrology, China
Participating drafting organizations.
Beijing Institute of Metrology
Shanghai Institute of Process Automation & Instrumentation
National Water Large Flowrate Measurement Station
Zhejiang Cangnan Instrument Group Co., Ltd.
Dandong Thermal Instrument Co., Ltd.
Zhejiang Tancy Instrument Group Co., Ltd.
Ningbo Chuangsheng Instrument Co., Ltd.
Tianjin Xinke Instrument Co., Ltd.
This Regulation entrusts National Technical Committee on Flow Capacity
Measurement to explain
Main drafters of this Regulation.
Li Xu (National Institute of Metrology, China)
Participating drafters.
Wang Yuntao (Beijing Institute of Metrology)
Li Chuanjing (Shanghai Institute of Process Automation & Instrumentation)
Miao Yusheng (National Water Large Flowrate Measurement Station)
Yin Xingjing (Zhejiang Cangnan Instrument Group Co., Ltd.)
Sun Xiaodong (Dandong Thermal Instrument Co., Ltd.)
Ye Peng (Zhejiang Tancy Instrument Group Co., Ltd.)
Lu Deyue (Ningbo Chuangsheng Instrument Co., Ltd.)
Xiao Qiang (Tianjin Xinke Instrument Co., Ltd.)
Table of Contents
1 Scope ... 6
2 References ... 6
3 Terms and definitions ... 6
4 General ... 7
4.1 Working principle... 7
4.2 Structure and composition... 7
4.3 Signal output mode ... 7
5 Metrological performance requirements ... 7
5.1 Accuracy grade ... 7
5.2 Repeatability ... 8
6 General technical requirements ... 8
6.1 Attach files ... 8
6.2 Nameplate and marking ... 8
6.3 Appearance ... 9
7 Metrological instrument control ... 9
7.1 Verification conditions ... 9
7.2 Verification items and verification method ... 12
7.3 Processing of verification results ... 17
7.4 Verification cycle ... 17
Annex A Type evaluation outline ... 18
Verification Regulation of Turbine Flowmeter
1 Scope
This Regulation applies to the type evaluation, initial verification and subsequent
verification of turbine flowmeters (hereinafter referred to as flowmeters).
2 References
JJF 1004-2004 Metrological terms and their definitions for flow rate
GB/T 18940-2003/ISO 9951.1993 Measurement of gas flow in closed conduits -
Turbine flowmeters
GB 17820-1999 Natural gas
GB/T 13609-1999 Natural gas - Sampling guidelines
When using this Regulation, it is important to use the current valid version of the above
references.
3 Terms and definitions
This Regulation uses the following terms, in addition to the metrological terms and their
definitions for flow rate in JJF 1004-2004.
3.1 K-coefficient
The number of pulses per unit volume of the fluid flowing through the flowmeter.
3.2 flow conditioner
A component that reduces vortices and improves velocity distribution.
3.3 transitional flow-rate qt
The flow value between the maximum flow and the minimum flow, which divides the
flow range into two different zones of the maximum allowable error, namely “high zone”
and “low zone”.
d. Sign and number of license of manufacturing metrological instruments;
e. Nominal pressure;
f. Applicable working pressure and working temperature range;
g. Flow range;
h. Accuracy grade;
i. Date of manufacture.
As well as other relevant technical indicators.
6.3 Appearance
6.3.1 The newly manufactured flowmeter shall have a good surface treatment, and
shall not have burrs, scratches, cracks, rusts, mildews and coating peelings. The
interior of the flowmeter shall be clean, and the turbine rotor shall rotate flexibly. The
seal surface shall be smooth and no damage.
6.3.2 The welding of the connection part of the flowmeter surface shall be flat and
smooth, no faulty soldering, desoldering, etc.
6.3.3 The connectors must be solid and reliable, and shall not be loose or fall off due
to vibration.
6.3.4 The indicated figures shall be striking, neat, and the characters and symbols that
represent the function shall be complete, clear and correct.
6.3.5 The button shall have moderate hand-fell and no adhesion phenomenon.
6.3.6 Each mark of the flowmeter shall be correct; the protective glass on the reading
device shall have a good transparency and no defects such as distortion of the reading
that obstruct reading.
7 Metrological instrument control
The metrological instrument control includes type evaluation, initial verification and
subsequent verification. “Type evaluation outline” is given in Annex A.
7.1 Verification conditions
7.1.1 Flow standard device
7.1.1.1 The flow standard device (hereinafter referred to as device) and its supporting
instruments shall have a valid verification certificate.
temperature.
(2) During the verification of each flow point, the liquid temperature variation shall
not exceed ± 0.5 °C.
(3) The liquid shall not be mixed with gas; if necessary, a getter can be installed on
the upstream of the flowmeter.
7.1.2.3 Gas for verification
(1) The gas shall be free of free water or oil and other impurities.
(2) If using air as a verification medium, under any conditions, the condensation
caused by water vapor in air shall not appear.
(3) If using the natural gas as a verification medium, the gas component shall be
relatively stable, complying with the requirements of Type 2 gas in GB 17820.
The sampling is carried out according to GB/T 13609.
(4) During each verification of each flow point, the temperature variation of the gas
for verification shall not exceed ± 0.5 °C.
(5) During each verification of each flow point, the pressure variation of the gas for
verification shall not exceed ± 0.5 %.
7.1.3 Environmental conditions of verification
7.1.3.1 The ambient temperature is (5 ~ 45) °C; the relative humidity is generally 15 %
~ 95 %; the atmospheric pressure is generally (70 ~ 106) kPa.
7.1.3.2 The AC supply voltage shall be (220 ± 22) V, the power supply frequency shall
be (50 ± 2.5) Hz, or use a suitable AC or DC power supply (e.g. 24 V DC power supply)
according to the requirements of the flowmeter.
7.1.3.3 The effect of the external magnetic field on the flowmeter shall be small enough
to be negligible.
7.1.3.4 The effect of the mechanical vibration and noise on the flowmeter shall be small
enough to be negligible.
7.1.4 Flowmeter under verification
7.1.4.1 The flowmeter shall be coaxially installed with the front and rear straight pipe
sections, and the connection part of the test pipe section shall be free from leakage.
The gasket at the connection shall not penetrate into the fluid pipe.
7.1.4.2 When measuring the temperature of the fluid flowing through the flowmeter, it
according to the method specified in the flowmeter instructions.
7.2.3.2 The flowmeter shall be operated for at least 5 min in the range of 70 % to 100 %
of the achievable maximum verification flow, and be verified after the fluid temperature,
pressure and flow are stabilized.
7.2.3.3 Flowmeter verification
(1) The verification of the flowmeter shall contain the following flow points. qmin, qt,
0.40 qmax and qmax; for flowmeters with an accuracy grade of more than 0.5 %,
add the flow points of 0.25 qmax and 0.70 qmax; for flowmeters with an accuracy
grade of more than 0.5 % and a measuring range ratio of greater than 20 . 1,
add a verification point, of which the flow is 0.1 qmax.
(2) During the verification, whenever a flow point is adjusted, the verification shall
be carried out afte...
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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