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| GB/T 21446-2008 | English | RFQ |
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Measurement of natural gas flow by means of standard orifice meter
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GB/T 21446-2008
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Basic data | Standard ID | GB/T 21446-2008 (GB/T21446-2008) | | Description (Translated English) | Measurement of natural gas flow by means of standard orifice meter | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E98 | | Classification of International Standard | 75.180.30 | | Word Count Estimation | 102,199 | | Date of Issue | 2008-02-13 | | Date of Implementation | 2008-08-01 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.2 (Total No.115) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the formal structure of the standard orifice, technical requirements, take pressure throttling device, usage, installation and operating conditions, inspection requirements, gas at standard reference conditions volumetric flow and energy flow, mass flow measurement and Calculation of uncertainty. It also gives the calculation of flow and uncertainty about other aspects of the necessary information. This standard applies to take pressure of flange pressure and corner tapping the throttling device, flow measuring methane as the main component of the gas mixture with a standard orifice for gas or oil mined. This standard does not apply to the orifice hole diameter less than 12. 5mm, measure the inside diameter of less than 50mm and greater than 1000mm, diameter ratio of less than 0. 1 and greater than 0. 75, diameter Reynolds number less than 5000 occasions. | GB/T 21446-2008: Measurement of natural gas flow by means of standard orifice meter---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.
Measurement of natural gas flow by means of standard orifice meter
ICS 75.180.30
E98
National Standards of People's Republic of China
Standard orifice meter measuring gas flow
Posted 2008-02-13
2008-08-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅳ
1 Scope 1
2 Normative references 1
3 amount, terms and definitions 1
3.1 volume 1
3.2 Terms and Definitions 2
4 General requirements for measurement 4
4.1 throttle device 4
4.2 4 airflow
4.3 Standard reference conditions 5
5 Installation requirements 5
5.1 General 5
5.2 straight pipe conditions 5
5.3 straight pipe length and layout requirements 6
5.4 flow regulator 9
5.5 mounting plate holder 13
5.6 assembly and spacer 13
5.7 parameter measurement and signal leads 13
6 well plate structure and technical requirements 14
6.1 orifice 14
6.2 16 well plate holder
7 inspection requirements 18
7.1 the throttle device 18 geometry test
7.2 Verification and online calibration coefficient 19
8 gas flow measurement principle and calculation method 19
8.1 Measuring principle 19
8.2 Measurement range 19
8.3 Gas Flow Calculation 20
8.4 Gas flow calculation and coefficient parameters determined 22
8.5 Value methods and data repair about 23
8.6 Orifice flowmeter system 24
9 gas flow measurement uncertainty estimates 24
9.1 Uncertainty defined 24
The actual estimated 9.2 Uncertainty 25
Appendix A (normative) of natural gas and the main physical parameters to determine flow rate calculations are often used in Table 28
A. 1 The main physical parameters determined 28
A. 2 gas flow calculation commonly used Table 33
Annex B (informative) Performance Test flow regulator 68
B. 1 Description 68
B. Evaluation Test 2 Standard Equipment Requirements 68
B. 3 flow regulator performance testing and evaluation 68
Annex C (informative) parameter measurement and signal leads 71
C. 1 Measuring Instruments selected provisions 71
C. 2 temperature measurement Installation instructions 71
C. 3 pressure and differential pressure measurement provisions 71
C. 4 hole to take pressure setting specifies 71
C. Impulse control provisions 5 72
C. 6 differential signal line installation 72
Annex D (informative) throttling device appears in the use of part of the standard deviation from the prescribed treatment 75
D. 1 Description 75
D. 2 inlet orifice opening at right angles to the edge sharpness by abrasive processing 75
D. 3 measuring tube wall roughness by abrasive processing 75
D. 4 fluid pipe wall roughness experimentally determined 76
Annex E (informative) gas orifice flowmeter calibration system online 78
E. 1 line calibration 78
E. 2-line flowmeter calibration apparatus 78 standard
E. 3-line calibration factor Mf 78
E. 4-line calibration uncertainty estimates 79
Annex F (informative) gas flow calculation and design calculations Example 80
F. 1 gas flow calculation Example 80
F. 2 orifice hole diameter design calculation Example 83
F. 3 DP ranges design calculation example 85
F. 4 uncertainty estimate 87
Annex G (informative) gas flow calculation and design calculation block diagram 89
G. 1 Description 89
G. 2 iterations format 89
G. 3 a block diagram of a computer calculation program 90
Appendix H (informative) natural gas flow computer system basic technical requirements 94
H. General principles 1 flow computer systems use 94
H. 2 Flow Computer System Components 94
H. 3 Flow Computer System basic technical requirements 94
H. Uncertainty 4 flow computer system 96
1 throttling device composition and installation diagram in Figure 5
Figure 2 β '= 0.6 Straight Path VWO installation plan 8
Figure 3 Installation Example 9
Figure 419 bundle flow regulator 10
Figure 5 alone elbow 19 is installed downstream of the tube bundle flow regulator Example 12
Figure 6 Zanker rectifying plate 12
7 standard orifice plate 14
Figure 8 plate flatness measuring 14
Figure 9 flange pressure plate holder 16
10 corner tapping plate holder 17
Figure B. 1 snow Fulong cyclone 69
Figure C. 1 position to take pressure hole 72
Figure C. 2 differential pressure gauges attached to the top of the throttle device (non-corrosive medium) 73
Figure C. 3 Pressure gauges attached to the bottom of the throttle device (non-corrosive medium) 73
Figure C. 4 differential pressure gauges attached to the top of the throttle device (including corrosive medium) 74
Figure C. 5 differential pressure gauges attached to the bottom of the throttle device (including corrosive medium) 74
Figure G. 1 block diagram flow calculation 91
Figure G. 2 orifice hole diameter to calculate the block diagram 92
Figure G. 3 DP ranges calculate the block diagram 93
Table 1 Quantities and units of names and symbols 1
Table 2 between the plate and the baffles permitted length of straight pipe (no-flow regulator and its value is expressed in multiples of the pipe inner diameter D) 8
Table 3 19 well plate and tube bundle between the flow regulator allowed length of straight pipe (Baffles orifice plate distance LZ, value to the tube
Multiple inner diameter D representation) 11
Table 4 aperture, tube diameter, diameter ratio and Reynolds limit Table 19
Max Table 5 104R Rao/D 20
Table 6 104R Rao Min/D 20
Table 7 least significant digits coefficient parameter value Table 24
Table A. 1 flow coefficient C value table 33
Table A. Super compression factor FZ value table with 2.1 GB/T 17747.2 calculated (Appendix F to the natural gas component, for example) 43
Table A. 2.2 Ultra compression factor FZ value table with the calculated AGANX-19 (in Gr = 0.600; XC = 0%; Xn = 0% as an example) 53
Table A. 3 gas molar mass of common components, the molar heat summation factor and compression factor table 64
Table A. 4 linear expansion coefficient of metal material (20 ℃ ~ 100 ℃) table of values \u200b\u200b65
Table A. Methane dynamic viscosity μ values \u200b\u200bunder different pressures and temperatures 5 Table 65
Table A. 7 pipe wall equivalent absolute roughness K value table 66
Study hospital).
Participated in the drafting of this Standard. China Southwest Oil and Gas Field Branch of oil, the oil industry and gas flow metering stations, Beijing Bo Sida instrument
Instrument Co., Ltd., Chengdu Jinling valve limited liability company.
The main drafters of this standard. yellow and, Songde Qi, Yu Ming set, Zhang Yuan, Wen-generation Long, Zhangwei Chen Wei Lian Dun, paragraph following the celery, Liwan Jun,
Wang Jingan, Z. Li, Luo Mingjiang, Laizhong Ze.
Standard orifice meter measuring gas flow
1 Scope
This standard specifies the form of standard orifice structure, technical requirements; take pressure throttle device, use, installation and operating conditions,
Inspection requirements; volume flow and energy flow, mass flow measurement and the calculation of the uncertainty of natural gas under standard reference conditions. with
Shihai give the calculated flow and uncertainty about other aspects of the required information.
This standard applies to take pressure flange Pressure and corner tapping throttling device, with a standard orifice plate on gas or oilfield to A
Alkoxy flow measurement is a main component of the gas mixture.
This standard does not apply to orifice opening diameter of less than 12.5mm, the measuring tube inner diameter of less than 50mm and greater than 1000mm, a diameter smaller than
0.1 and greater than 0.75, the diameter Reynolds number less than 5000 occasions.
For remodeling or new metering system should meet the requirements of this standard. This standard does not emphasize the update has been built metering system. If the measurement system is not
Meet the requirements of this standard, due to the flow conditions and the straight pipe upstream incompatible metering systems may exist additional error.
2 Normative references
The following documents contain provisions which, through the standard reference and become the standard terms. For dated references, subsequently
Some amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Study whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB 3836.1 Electrical apparatus for explosive gas atmospheres - Part 1. General requirements (GB 3836.1-2000, eqv IEC
60079-0.1998)
GB/T 8170-1987 numerical rounding rules
GB/T 11062-1998 natural gas calorific value, density, relative density and Wobbe index calculation method (neq ISO 6976.1995)
GB/T 15464-1995 instrumentation packaging technology
GB/T 17747 (all parts) natural gas compression factor calculation [eqv ISO 12213 (all parts)]
GB/T 18603-2001 natural gas measurement system technical requirements
JJG640-1994 differential pressure flowmeter
JJF1059-1999 Evaluation and Expression of Uncertainty in Measurement
3 amount, terms and definitions
3.1 amount
Names and symbols of the standard amount and units are shown in Table 1.
Names and symbols Table 1 and the amount of units
Code quantity amounts dimensionless unit Name Symbol
Discharge coefficient C 1
D upstream operating conditions of the measuring tube inner diameter L m
E asymptotic rate coefficient
FG relative density factor 1
FT flow temperature coefficient
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