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GB/T 21246-2020: (Method for measuring cathodic protection parameters of buried steel pipelines)
Status: Valid GB/T 21246: Evolution and historical versions
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(Method for measuring cathodic protection parameters of buried steel pipelines)
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GB/T 21246-2020
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| GB/T 21246-2007 | English | RFQ |
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Measurement method for cathodic protection parameters of buried steel pipelines
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GB/T 21246-2007
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PDF similar to GB/T 21246-2020
Basic data | Standard ID | GB/T 21246-2020 (GB/T21246-2020) | | Description (Translated English) | (Method for measuring cathodic protection parameters of buried steel pipelines) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E98 | | Word Count Estimation | 27,225 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-06-01 | | Older Standard (superseded by this standard) | GB/T 21246-2007 | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 21246-2020: (Method for measuring cathodic protection parameters of buried steel pipelines)---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.
(Method for measuring cathodic protection parameters of buried steel pipelines)
ICS 75.180.30
E98
National Standards of People's Republic of China
Replace GB/T 21246-2007
Method for measuring cathodic protection parameters of buried steel pipelines
2020-11-19 released
2021-06-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Basic rules 2
4.1 Measuring instrument 2
4.2 Voltage and current meter 2
4.3 Reference electrode 2
4.4 Basic requirements for measurement 3
4.5 Potential polarity 3
5 Potential measurement 4
5.1 Natural potential 4
5.2 Power-on potential 4
5.3 Power-off potential 4
5.4 Closely spaced potential 5
5.5 Enhanced measurement method 6
5.6 Negative offset of cathode potential 7
5.7 Polarization probe method 8
5.8 Soil pipe method 9
5.9 Sacrificial anode open circuit potential 10
5.10 Pipe-to-ground potential of the sacrificial anode access point (closed circuit potential) 11
6 Sacrificial anode output current 11
6.1 Standard resistance method 11
6.2 Direct measurement method 12
7 DC current in the tube 12
7.1 Voltage drop method 12
7.2 Calibration method 13
7.3 Current loop method 14
8 Insulation performance of insulating joint (flange) 14
8.1 The megohmmeter method 14
8.2 Potentiometric method 15
8.3 Voltage method 16
8.4 Leakage rate measurement method 17
8.5 Power current loop method 17
8.6 Grounding resistance meter measurement method 18
9 Grounding resistance 19
9.1 Grounding resistance method of long grounding body 19
9.2 Short grounding body grounding resistance method 20
10 Soil resistivity 20
10.1 Isometric method 20
10.2 The unequal distance method 21
11 Corrosion rate 22
11.1 General provisions 22
11.2 Weightlessness inspection film method 22
11.3 Resistance probe method 22
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 21246-2007 "Method for Measuring Cathodic Protection Parameters of Buried Steel Pipelines", and is in line with GB/T 21246-2007
The main technical changes are as follows.
---Added the potential value and temperature coefficient of silver chloride reference electrode and common reference electrode (see 4.3.3,.2007 edition 4.3.3);
---Detailed requirements for power-off potential measurement (see 5.3, 5.3 of the.2007 edition);
---Added the requirement of current synchronization verification in close interval potential measurement (see 5.4.2);
---Modified the name and applicability of cathodic polarization potential and diagram (see 5.6,.2007 edition 5.6);
--- Supplement the installation and test piece requirements of the polarization probe method (see 5.7, 5.9 in the.2007 edition);
---Added soil pipe method (see 5.8);
---Added the current loop method (see 7.3);
---Modified the requirements of megohmmeter method measuring instrument (see 8.1.2, 9.1.2 in.2007 edition);
--- Refined the content of the electric potential method for testing the insulation performance of insulating joints (flanges) (see 8.2, 9.2 of the.2007 edition);
---Insulation joint (flange) insulation performance test adds voltage method and power current loop method (see 8.3 and 8.5);
---Increase the corrosion rate measurement (see Chapter 11);
---Deleted the positioning of the anode zone of the pipeline (see 5.10 of the.2007 edition);
--- Deleted the resistivity of the outer anti-corrosion coating of the pipeline (see Chapter 8 of the.2007 edition);
---Deleted the ground leak detection of the outer anti-corrosion layer of the pipeline (see Chapter 12 of the.2007 edition).
This standard was proposed and managed by the National Petroleum and Natural Gas Standardization Technical Committee (SAC/TC355).
Drafting organizations of this standard. Southwest Branch of China Petroleum Engineering Construction Co., Ltd., Southwest Oil & Gas of China National Petroleum Corporation
Tian Branch Institute of Safety, Environmental Protection and Technical Supervision, China National Petroleum Corporation Pipeline Branch, China National Petroleum Pipeline
Engineering Co., Ltd., PetroChina Beijing Natural Gas Pipeline Co., Ltd., Guangdong Dapeng LNG Co., Ltd.
The main drafters of this standard. Zhang Ping, Qin Lin, Chen Zhenhua, Huang Liuqun, Wang Chunyu, Liu Quan, Tu Haibo, Zhang Liang, Tang Qiang, Zuo Fei, Zheng Ansheng,
Zhang Shengli and Xu Huatian.
The previous versions of the standard replaced by this standard are as follows.
---GB/T 21246-2007.
Method for measuring cathodic protection parameters of buried steel pipelines
1 Scope
This standard specifies on-site measurement methods for cathodic protection parameters of buried steel pipelines on land.
This standard is applicable to the field measurement of cathodic protection parameters of buried steel oil, gas and water pipelines on land.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
JJG124 ammeter, voltmeter, power meter and resistance meter
JJG366 Ground Resistance Meter Verification Regulation
JJG622 Insulation Resistance Meter (Megger) Verification Regulation
JJF1587 Digital Multimeter Calibration Specification
SY/T 0029 Technical Specification for Application of Buried Steel Inspection Sheet
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Pipe ground potential
The potential difference between the pipe and its neighboring electrolyte (soil).
3.2
Natural potential
There is no net current (external) flowing into or out of the corrosion potential from the metal surface under study.
3.3
Energized potential
The tube ground potential measured during continuous operation of the cathodic protection system.
3.4
IR drop
The product of all currents in the cathodic protection circuit and the circuit resistance (mainly electrolyte resistance and pipeline resistance).
3.5
Power-off potential
Instantaneous power-off potential
In order to test the potential without IR drop, the potential measured instantaneously after a short delay in the loop current interruption.
3.6
Impulse voltage
The moment the cathodic protection current is interrupted or applied, the transient potential fluctuations on the pipeline caused by the inductance and capacitance characteristics of the system.
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