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GB/T 21246-2020 English PDF

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US$499.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 21246-2020: (Method for measuring cathodic protection parameters of buried steel pipelines)
Status: Valid

GB/T 21246: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21246-2020	499	Add to Cart	5 days	(Method for measuring cathodic protection parameters of buried steel pipelines)	Valid
GB/T 21246-2007	RFQ	ASK	6 days	Measurement method for cathodic protection parameters of buried steel pipelines	Obsolete

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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Older Standard (superseded by this standard): GB/T 21246-2007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

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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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 21246-2020_English be delivered?

Answer: Upon your order, we will start to translate GB/T 21246-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 21246-2020_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 21246-2020_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 21246-2020?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 21246-2020 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.