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GB/T 18052-2025: Methods of gauging and inspection of casing, tubing and line pipe threads
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GB/T 18052-2000	English	1829	Add to Cart	8 days [Need to translate]	Gauging and inspection of casing, tubing and line pipe threads

GB/T 18052-2025: Methods of gauging and inspection of casing, tubing and line pipe threads

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ICS 75.180.10 CCSE92 National Standards of the People's Republic of China Replaces GB/T 18052-2000 Measurement of casing, tubing and line thread and testing methods Published on 2025-10-05 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms, Definitions, Symbols, and Abbreviations 1 3.1 Terms and Definitions 1 3.2 Symbol 5 3.3 Abbreviations 6 4 Threaded connectors 6 4.1 General Rules 6 4.2 Pipeline threads 7 4.3 Round threads of tubing and casing 8 4.4 Casing with trapezoidal thread 9 4.5 Special threads for tubing and casing 11 4.6 Thread Measurement and Inspection Items 12 5 Inspectors 14 5.1 General Rule 14 5.2 Training Content 14 5.3 Qualification 14 6.Calibration, use and storage of measuring instruments 15 6.1 General Rules 15 6.2 Calibration 15 6.3 Use 15 6.4 Store 16 7.Visual inspection 16 7.1 General Rule 16 7.2 Inspection Tools 16 7.3 Visual Inspection Steps 16 7.4 Visual inspection of external threads 21 7.5 Visual inspection of internal threads 25 8.Thread measurement 26 8.1 General Rules 26 8.2 Measurement Location and Measurement Interval 26 8.3 Thread length 28 8.4 Triangle with 28-point marking 8.5 taper 29 8.6 Pitch 33 8.7 Tooth height 38 8.8 Tooth crest height 42 8.9 Thread major diameter and ovality 45 8.10 Sealing diameter and ovality 52 8.11 Thread profile measurement 53 8.12 Screw tail 53 8.13 Tooth thickness/alveolar width 55 8.14 Coupling thread axis overlap 59 8.15 Internal thread torque shoulder depth 61 8.16 Close distance 61 8.17 The coupling machine tightens the buckle at position 67. Appendix A (Informative) Typical Thread Measuring Instrument Configuration 69 Appendix B (Normative) Requirements for Automated Thread Measurement Systems 70 Appendix C (Normative) Requirements for Thread Digital Inspection Systems 71 Appendix D (Informative) Factors Affecting the Repeatability of Measurement Results 72 Appendix E (Normative) Measurement of Sealing Ring Groove Depth 73 Appendix F (Informative) Thread Measurement and Inspection Record Format 74

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document supersedes GB/T 18052-2000 "Measurement and Inspection Methods for Casing, Tubing and Line Pipe Threads", and is consistent with GB/T 18052- Compared to.2000, aside from structural adjustments and editorial changes, the main technical changes are as follows. a) The scope has been revised, and inspection methods for special threads on tubing and casing have been added (see Chapter 1, Chapter 1 of the.2000 edition); b) Added terms and definitions such as "special thread," "ovalness," "sealing surface," "thread thickness," and "burr" (see 3.1); c) The terms and definitions such as "internal thread," "external thread," "thread root," "thread crest," and "lead" have been deleted (see section 3.1 of the.2000 edition); d) The terms and definitions for thread crest height, incomplete thread, and thread angle have been changed (see 3.1,.2000 edition 3.1); e) Symbols such as A, L4, and P1 have been added (see 3.2); f) Added abbreviations such as OM, PTL, and VTI (see 3.3); g) The direct-connection thread (integral connection) has been removed (see 4.4 in the.2000 edition); h) Increased requirements for inspection personnel (see Chapter 5); i) The criteria for rejection due to incomplete 360° circumferential chamfering have been changed (see 7.4.4.1, 5.2.8.1 of the.2000 version); j) The number of inspected threads that were recalibrated after the gauge was changed (see 8.1, 7.2 of the.2000 edition); k) The inspection for straight-through threads has been removed (see 8.6 in the.2000 edition); l) A method for measuring thread crest height has been added (see 8.8); m) Added methods for measuring apex diameter and ellipticity (see 8.9); n) Added methods for measuring the diameter and ovality of special thread seals (see 8.10); o) The equipment used for angle and thread profile measurement was changed from a thread profile microscope to an optical comparator and profile projector (see 8.11). (9.1 of the.2000 edition) p) A method for measuring tooth thickness/alveolar width has been added (see 8.13); q) A method for measuring the depth of the internal thread torque shoulder has been added (see 8.15). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Petroleum and Natural Gas (SAC/TC355). This document was drafted by. China Petroleum Engineering Materials Research Institute Co., Ltd., and Changqing Oilfield of China National Petroleum Corporation. Branch Company, Southwest Oil & Gas Field Branch of China National Petroleum Corporation, Qinghai Oilfield Branch of China National Petroleum Corporation Company, Northwest Oilfield Branch of China Petroleum & Chemical Corporation, Baoshan Iron & Steel Co., Ltd., Tianjin Pipe Manufacturing Co., Ltd., China PetroChina Gemstone Pipe Industry Co., Ltd., CNOOC Energy Development Equipment Technology Co., Ltd., Xi'an Tairui Precision Machinery Technology Co., Ltd. Liaoning Dongyu Petroleum Pipe Manufacturing Co., Ltd., Jianhu Fulida Machinery Manufacturing Co., Ltd., Henan Xinkaiyuan Petrochemical Pipeline Co., Ltd., Shandong Yongli Jinggong Petroleum Equipment Co., Ltd., Dongying Jinyilai Petroleum Machinery Co., Ltd., Shengli Oilfield Jindao Industry Co., Ltd., Daqing Simles Oil Pipe Manufacturing Co., Ltd., Qingzhou Chunhui Technology Development Co., Ltd., Puyang Baolitong Petroleum Machinery Co., Ltd. Yangzhou Ruide Petroleum Machinery Co., Ltd., Jianghan Oilfield Hongjia Machinery Qianjiang Co., Ltd., Yancheng Dongrong Petroleum Machinery Co., Ltd., Shandong Gao Oil and Gas Equipment Co., Ltd., Shandong Molong Petroleum Machinery Co., Ltd., Shandong Huaguan Energy Technology Co., Ltd., Dongying Huachen Petroleum Equipment Equipment Co., Ltd., Dongying Changrui Petroleum Machinery Parts Co., Ltd. The main drafters of this document are. Ai Yufeng, Bai Xiaoliang, Wei Zunyi, Xu Ting, Feng Na, Yu Zhi, Wang Linhong, Yu Zhuo, Tian Qing, Lei Zheng, Ni Rui, and E Zhipeng. Li Qiang, Cai Yongqiao, Liu Kaimin, Zou Hao, Wang Lan, Feng Hong, Feng Jie, Lou Qi, Xu Xiaofeng, Ji Nan, Song Huan, Liu Shaofeng, Zhang Jun, Chen Chen, Lü Qinggang Li Chunguang, Wang Junzheng, Song Zeyu, Zhang Huwei, Liu Guoguang, Zhang Xiaohui, Liu Kefeng, Zhou Hong, Xie Longhua, Shi Diange, Ren Yongxian, Liu Jiang, Wang Yugang Liu Weidong, Wang Hongbing, Huang Xinxian, Liu Zhibo, Gao Yundong. The release history of this document and the document it replaces is as follows. ---First published in.2000 as GB/T 18052-2000; ---This is the first revision. Measurement of casing, tubing and line thread and testing methods

1 Scope

This document describes the appearance and dimensions of round threaded sleeves and tubing, trapezoidal threaded sleeves, special threaded sleeves and tubing, and line pipe threads. Methods for measuring and inspecting individual parameters such as inch, tightness, and thread. This document applies to the measurement and inspection of casing, tubing, and pipeline threads.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 9253 Machining, Measurement and Inspection of Casing, Tubing and Line Threads in the Oil and Gas Industry GB/T 14791 Thread Terminology JJF1063 Oil Thread Single Parameter Checker JJF1108 Calibration Specification for Petroleum Thread Working Gauges SY/T 6445 Terminology for Common Defects in Oil Pipes 3.Terms, definitions, symbols and abbreviations 3.1 Terms and Definitions The following terms and definitions apply to this document. 3.1.1 tooth top height addendum The radial distance between the crest of a threaded tooth and its mid-diameter. [Source. GB/T 14791-2013, 4.15] 3.1.2 tooth height of thread The radial distance between the crest and the root of a threaded tooth. [Source. GB/T 14791-2013, 4.14] 3.1.3 Thread profile The thread profile shape over a pitch length in the axial plane. 3.1.4 black-crested threads Incomplete threads are formed due to the original rolled surface not being removed. [Source. GB/T 9253-2022, 3.1.4] ...