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GB/T 18604-2014 English PDF (GBT18604-2014)
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GB/T 18604-2014: Measurement of natural gas flow by gas ultrasonic flow meters
GB/T 18604-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.180.30
E 98
Replacing GB/T 18604-2001
Measurement of natural gas flow by gas ultrasonic
flow meters
ISSUED ON: FEBRUARY 19, 2014
IMPLEMENTED ON: JUNE 01, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Measurements, terms and definitions ... 7
4 Measurement principle ... 10
4.1 Fundamental principle ... 10
4.2 Influencing factors of accuracy measurement ... 11
5 Working conditions ... 11
5.1 Natural gas quality ... 11
5.2 Pressure ... 12
5.3 Temperature ... 12
5.4 Flow range and flow direction ... 12
5.5 Velocity distribution ... 12
6 Measurement performance requirements ... 13
6.1 Measurement performance requirements for multi-path gas ultrasonic flow meter ... 13
6.2 Measurement performance requirements for single-path gas ultrasonic flow meter ... 16
6.3 Influence of working conditions on measurement performance ... 16
7 Flow meter requirements ... 16
7.1 Composition and basic provisions ... 16
7.2 Meter body ... 17
7.3 Ultrasonic transducer ... 19
7.4 Electronic components ... 20
7.5 Flow computer ... 22
8 Installation requirements and maintenance ... 24
8.1 Installation influencing factors ... 24
8.2 Pipe configuration ... 25
8.3 Maintenance ... 27
9 Testing requirements for on-site verification ... 28
9.1 Testing contents and steps ... 28
9.2 Testing report ... 28
10 Flow calculation method and estimation of measurement uncertainty ... 29
10.1 Flow calculation under standard reference conditions ... 29
10.2 Determination of measured flow value under standard reference conditions... 31
10.3 Flow calculation under working conditions ... 31
10.4 Estimation of flow measurement uncertainty ... 31
Annex A (informative) Fundamental principles ... 35
Annex B (normative) Flow calibration of flow meter components ... 46
Annex C (normative) Exit-factory testing requirements ... 53
Annex D (informative) Documents available ... 56
Annex E (informative) Generation and prevention measures of acoustic noise
... 59
Annex F (informative) Performance verification tests of flow meter and flow
conditioner ... 65
Annex G (informative) Monitoring and guarantee of on-site measurement
performance of flow meter ... 67
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 18604-2001 “Measurement of natural gas flow by
ultrasonic flow meter”. Compared with GB/T 18604-2001, in addition to editorial
modifications, main technical changes as follows:
- added three terms: maximum error shift with one path failed, speed of
sound (SOS) deviation and metering package (see 3.2.17, 3.2.18 and
3.2.19);
- modified influencing factors of measurement accuracy; divided the
influencing factors into two categories: internal factors and external factors
(see Clause 4);
- further specified the range of working temperature as medium temperature
and ambient temperature (see 5.3);
- improved the requirements for zero-flow reading of multi-path gas ultrasonic
flow meter; added two technical requirements of sound velocity deviation
and maximum sound velocity difference; modified the maximum peak-to-
peak error requirement above the demarcation flow (see 6.1);
- added that according to the ambient conditions and working conditions,
taking necessary thermal insulation, anti-freeze measures, and related
requirements for acoustic noise and pulsation to flow meter components
(including upstream and downstream straight pipe sections, flow meters
and flow conditioners, temperature tapping holes and sampling holes)
(see 8.1.1, 8.1.4, 8.1.5 and Annex E);
- modified relevant requirements for pipe installation upstream straight pipe
section and flow conditioner installation position, temperature
measurement hole and sampling hole insertion depth, flow conditioner
(see 8.2.2, 8.2.5 and 8.2.7 and Annex F);
- added the requirements for on-site measurement performance of ultrasonic
flow meters in routine maintenance (see 8.3.1 and Annex G);
- added the requirements that theoretical sound velocity is calculated
according to the method provided by AGA Report No.10 “Speed of sound
in natural gas and other related hydrocarbon gases” and other methods
that are same as the calculation (see 9.1.3);
- added the calculation method and uncertainty estimation for mass flow and
energy flow (see Clause 10);
- modified flow calibration to flow calibration of metering package; modified
stability requirements for temperature and pressure, test traffic point (see
B.2.2 and B.3.3);
- deleted the original Annex E “Upper and lower pipe length requirements”;
- added technical requirements of “acoustic noise generation and prevention
measures” (see Annex E);
- added technical requirements of “flow meter and flow conditioner
performance verification test” (see Annex F);
- added technical requirements of “monitoring and guarantee of flow meter
on-site measurement performance” (see Annex G).
This Standard uses redrafting method to modify and adopt AGA Report No.10
“Speed of sound in natural gas and other related hydrocarbon gases”.
This Standard was proposed by and shall be under the jurisdiction of National
Technical Committee on Petroleum Gas of Standardization Administration of
China (SAC/TC 355).
The drafting organizations of this Standard: National Oil and Gas Large Flow
Metering Station Chengdu Sub-Station, PetroChina Southwest Oil and Gas
Field Branch, PetroChina Group Engineering Design Co., Ltd. Southwest
Branch.
Main drafters of this Standard: Duan Jiqin, He Min, Wen Dailong, Ren Gui,
Huang He, Liu Yongming, Chen Huiyu, Wang Qiang, Chen Qi, Ni Rui.
Measurement of natural gas flow by gas ultrasonic
flow meters
1 Scope
This Standard specifies measurement performance requirements of gas
ultrasonic flow meters, meter body requirements, installation and maintenance,
field verification test requirements, and flow calculation methods and
measurement uncertainty estimates.
This Standard is applicable to gas ultrasonic flow meters of plug-in transit-time
difference method (hereinafter referred to as the flow meter), which are
generally used for natural gas flow measurement in gathering devices, gas
pipelines, storage facilities, gas distribution systems and customer metering
systems. The use of external clamp-on gas ultrasonic flow meter can refer to
this Standard.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB 3836.1, Explosive atmospheres - Part 1: Equipment - General
requirements
GB 3836.2, Explosive atmospheres - Part 2: Equipment protection by
flameproof enclosures “d”
GB 3836.4, Explosive atmospheres - Part 4: Equipment protection by
intrinsic safety “i”
GB/T 4208, Degrees of protection provided by enclosure (IP code) (IEC
60529)
GB/T 11062-1998, Natural gas - Calculation of calorific values, density,
relative density and Wobbe index from co...
Get QUOTATION in 1-minute: Click GB/T 18604-2014
Historical versions: GB/T 18604-2014
Preview True-PDF (Reload/Scroll if blank)
GB/T 18604-2014: Measurement of natural gas flow by gas ultrasonic flow meters
GB/T 18604-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.180.30
E 98
Replacing GB/T 18604-2001
Measurement of natural gas flow by gas ultrasonic
flow meters
ISSUED ON: FEBRUARY 19, 2014
IMPLEMENTED ON: JUNE 01, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Measurements, terms and definitions ... 7
4 Measurement principle ... 10
4.1 Fundamental principle ... 10
4.2 Influencing factors of accuracy measurement ... 11
5 Working conditions ... 11
5.1 Natural gas quality ... 11
5.2 Pressure ... 12
5.3 Temperature ... 12
5.4 Flow range and flow direction ... 12
5.5 Velocity distribution ... 12
6 Measurement performance requirements ... 13
6.1 Measurement performance requirements for multi-path gas ultrasonic flow meter ... 13
6.2 Measurement performance requirements for single-path gas ultrasonic flow meter ... 16
6.3 Influence of working conditions on measurement performance ... 16
7 Flow meter requirements ... 16
7.1 Composition and basic provisions ... 16
7.2 Meter body ... 17
7.3 Ultrasonic transducer ... 19
7.4 Electronic components ... 20
7.5 Flow computer ... 22
8 Installation requirements and maintenance ... 24
8.1 Installation influencing factors ... 24
8.2 Pipe configuration ... 25
8.3 Maintenance ... 27
9 Testing requirements for on-site verification ... 28
9.1 Testing contents and steps ... 28
9.2 Testing report ... 28
10 Flow calculation method and estimation of measurement uncertainty ... 29
10.1 Flow calculation under standard reference conditions ... 29
10.2 Determination of measured flow value under standard reference conditions... 31
10.3 Flow calculation under working conditions ... 31
10.4 Estimation of flow measurement uncertainty ... 31
Annex A (informative) Fundamental principles ... 35
Annex B (normative) Flow calibration of flow meter components ... 46
Annex C (normative) Exit-factory testing requirements ... 53
Annex D (informative) Documents available ... 56
Annex E (informative) Generation and prevention measures of acoustic noise
... 59
Annex F (informative) Performance verification tests of flow meter and flow
conditioner ... 65
Annex G (informative) Monitoring and guarantee of on-site measurement
performance of flow meter ... 67
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 18604-2001 “Measurement of natural gas flow by
ultrasonic flow meter”. Compared with GB/T 18604-2001, in addition to editorial
modifications, main technical changes as follows:
- added three terms: maximum error shift with one path failed, speed of
sound (SOS) deviation and metering package (see 3.2.17, 3.2.18 and
3.2.19);
- modified influencing factors of measurement accuracy; divided the
influencing factors into two categories: internal factors and external factors
(see Clause 4);
- further specified the range of working temperature as medium temperature
and ambient temperature (see 5.3);
- improved the requirements for zero-flow reading of multi-path gas ultrasonic
flow meter; added two technical requirements of sound velocity deviation
and maximum sound velocity difference; modified the maximum peak-to-
peak error requirement above the demarcation flow (see 6.1);
- added that according to the ambient conditions and working conditions,
taking necessary thermal insulation, anti-freeze measures, and related
requirements for acoustic noise and pulsation to flow meter components
(including upstream and downstream straight pipe sections, flow meters
and flow conditioners, temperature tapping holes and sampling holes)
(see 8.1.1, 8.1.4, 8.1.5 and Annex E);
- modified relevant requirements for pipe installation upstream straight pipe
section and flow conditioner installation position, temperature
measurement hole and sampling hole insertion depth, flow conditioner
(see 8.2.2, 8.2.5 and 8.2.7 and Annex F);
- added the requirements for on-site measurement performance of ultrasonic
flow meters in routine maintenance (see 8.3.1 and Annex G);
- added the requirements that theoretical sound velocity is calculated
according to the method provided by AGA Report No.10 “Speed of sound
in natural gas and other related hydrocarbon gases” and other methods
that are same as the calculation (see 9.1.3);
- added the calculation method and uncertainty estimation for mass flow and
energy flow (see Clause 10);
- modified flow calibration to flow calibration of metering package; modified
stability requirements for temperature and pressure, test traffic point (see
B.2.2 and B.3.3);
- deleted the original Annex E “Upper and lower pipe length requirements”;
- added technical requirements of “acoustic noise generation and prevention
measures” (see Annex E);
- added technical requirements of “flow meter and flow conditioner
performance verification test” (see Annex F);
- added technical requirements of “monitoring and guarantee of flow meter
on-site measurement performance” (see Annex G).
This Standard uses redrafting method to modify and adopt AGA Report No.10
“Speed of sound in natural gas and other related hydrocarbon gases”.
This Standard was proposed by and shall be under the jurisdiction of National
Technical Committee on Petroleum Gas of Standardization Administration of
China (SAC/TC 355).
The drafting organizations of this Standard: National Oil and Gas Large Flow
Metering Station Chengdu Sub-Station, PetroChina Southwest Oil and Gas
Field Branch, PetroChina Group Engineering Design Co., Ltd. Southwest
Branch.
Main drafters of this Standard: Duan Jiqin, He Min, Wen Dailong, Ren Gui,
Huang He, Liu Yongming, Chen Huiyu, Wang Qiang, Chen Qi, Ni Rui.
Measurement of natural gas flow by gas ultrasonic
flow meters
1 Scope
This Standard specifies measurement performance requirements of gas
ultrasonic flow meters, meter body requirements, installation and maintenance,
field verification test requirements, and flow calculation methods and
measurement uncertainty estimates.
This Standard is applicable to gas ultrasonic flow meters of plug-in transit-time
difference method (hereinafter referred to as the flow meter), which are
generally used for natural gas flow measurement in gathering devices, gas
pipelines, storage facilities, gas distribution systems and customer metering
systems. The use of external clamp-on gas ultrasonic flow meter can refer to
this Standard.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB 3836.1, Explosive atmospheres - Part 1: Equipment - General
requirements
GB 3836.2, Explosive atmospheres - Part 2: Equipment protection by
flameproof enclosures “d”
GB 3836.4, Explosive atmospheres - Part 4: Equipment protection by
intrinsic safety “i”
GB/T 4208, Degrees of protection provided by enclosure (IP code) (IEC
60529)
GB/T 11062-1998, Natural gas - Calculation of calorific values, density,
relative density and Wobbe index from co...
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