GB/T 9253-2022Petroleum and natural gas industries—Threading, gauging and thread inspection of casing, tubing, and line pipe threads (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 9253.2-2017 "Machining, Measurement and Inspection of Casing, Tubing and Line Pipe Threads in Oil and Gas Industry Test". Compared with GB/T 9253.2-2017, except for structural adjustment and editorial changes, the main technical changes in this document are as follows.

a) Delete the content of the direct connection bushing (see Chapter 1, Appendix F of the 2017 edition);

b) Added crest height, crest diameter, crest flattening height, effective thread length, hand tightness, close distance, vanishing point, ellipticity, complete thread length Terms and definitions such as degree, pitch cone, machine tightness, taper, number of teeth, etc. (see 3.1);

c) Added abbreviations such as BC, LC, LP, MOW, Rd, SC, TECL, TPI (see 3.2);

d) Schematic diagrams of measurement distance (see Figure 14~17) and schematic diagrams of single-item calibration (see Figure 23~24, Figure 29~ Figure 34) and a schematic diagram of thread measurement (see Figure 25 to Figure 28, Figure 39 to Figure 46, Figure 49, Figure 52 to Figure 59);

e) Added requirements for thread crest height gauges and standard blocks, and requirements for crest height measurement (see 6.5, Figure 28, Figure 31, Figure 34, Figure 35, Figure 39, Figure 43);

f) The measurement requirements of the thread profile and angle and the measurement requirements of the partial trapezoidal thread profile single-meter gauge have been changed (see 6.6.3, Figure 45~ Figure 46, 6.7.2, Figure 47, Figure 48, 6.6.2, Figure 17, 6.7.2, Figure 18, Figure 19 of the 2017 edition);

g) The measurement of thread pitch diameter (top diameter) is added, including. measurement position, gauge requirements, average diameter, ellipticity, ovality and close distance Influence of tolerance and calculation formula (see 7.1~7.8, Figure 54~Figure 59);

h) Changed the calibration organization (see 9.1, 9.1 of the 2017 edition), and deleted the API gauge calibration organization requirements (see the appendix of the 2017 edition record B);

i) Deleted the shipping instructions for calibration gauges (see Appendix A of the 2017 edition);

j) In the size table, the dimensions of crest height, crest diameter C12 at M12 of internal thread, C11 of crest diameter of large end face, crest diameter of C10 at L10 of external thread, Small end top diameter C9 size (see Table B.1 or Table C.1, Table B.4 or Table C.4, Table B.5 or Table C.5, Table B.7 or Table C.7, Table B.8 or Table C.8);

k) Increased the tolerances of the average top diameter, ovality, and crest height in the thread size tolerance table, and modified the tolerance of the tooth profile height (see Table B.2 or Table C.2, Table B.6 or Table C.6, Table B.13 or Table C.13);

l) Increased the size of the crest height standard calibration block (see Table B.23 or Table C.23);

m) Added the maximum ovality size table allowed for various specifications of casing and tubing and the incremental table for a given elliptical alignment distance (see Table B.25 or Table C.25, Table B.27 or Table C.27).

1 Scope

This document specifies the connecting threads of line pipe, round thread casing, round thread oil pipe and trapezoidal thread casing used in the oil and gas industry (abbreviated Requirements for dimensions, tolerances and markings of API threads) and gauges, as well as instruments and methods for inspecting API threads and gauges.

This document applies to the processing, measurement and inspection of casing, tubing and line pipe threads for the oil and gas industry.

This document also applies to control thread acceptance gauges, including individual parameter gauges and instruments used to inspect API threads.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 23512 Evaluation and test of thread compound for casing, tubing, line pipe and drill string components of petroleum and natural gas industry

GB/T 27025 General requirements for the competence of testing and calibration laboratories

3 Terms, Definitions, Symbols and Abbreviations