GB/T 9711-2023Petroleum and natural gas industries - Steel pipe for pipeline transportation systems (English PDF)

Foreword

This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives

for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.

This document serves as a replacement of GB/T 9711-2017 Petroleum and Natural Gas

Industries - Steel Pipe for Pipeline Transportation Systems. In comparison with GB/T 9711-

2017, apart from structural adjustments and editorial modifications, the main technical changes

are as follows.

a) The Scope is modified (see Chapter 1; Chapter 1 of Version 2017);

b) Some terms and definitions are deleted (see Chapter 4 of Version 2017);

c) Some symbols and abbreviations are added (see Chapter 3);

d) The information provided by the purchaser is modified (see Chapter 4; Chapter 7 of

Version 2017);

e) The content of heat treatment of laser welded steel pipes and PSL 2 high frequency

welded steel pipe welds and HAZ is modified (see 5.1; 8.8.2 of Version 2017);

f) The requirements for the local straightness deviation of the pipe end are modified (see

5.1; 9.11.3.4 of Version 2017);

g) The requirements for the perpendicularity of the pipe end are added (see 5.1);

h) The dimensions of the impact specimens are modified (see 5.1; Table 22 of Version

2017);

i) The dimensions of the bending dies of the wall thickness reduction specimens in the

guided bending test are modified (see 5.1; 10.2.4.6 of Version 2017);

j) The requirements for welded butt steel pipes are modified (see 5.1; Appendix A of

Version 2017);

k) The position drawing of the weld hardness test of the HFW pipe that is normalized or

quenched and tempered throughout the pipe is added [see 5.1; Figure H.1 d) and

Figure J.1 d) of Version 2017];

l) The content of ordering PSL 2 steel pipes with longitudinal plastic strain capacity

service conditions is added (see 5.1);

m) The steel grade when ordering PSL 2 steel pipes resistant to ductile fracture

propagation for gas pipelines when the agreement stipulates the banded structure,

grain size and inclusion requirements of raw materials (see 5.2; 8.3.3 of Version 2017);

n) The requirements for hydrostatic pressure test of butt-joined steel pipes are modified

(see 5.3; 9.4.2 of Version 2017);

o) The content of PSL 2 steel pipe hardness test is added (see 5.4);

p) The requirements for bevel cutting are deleted (see 9.12.1.4 of Version 2017);

q) The requirements for the maximum allowable outer weld bead height at the pipe ends

of SAW pipes and COW pipes are modified (see 5.5; 9.13.2.2 of Version 2017);

r) The requirements for the sampling location of impact specimens in the heat affected

zone during weld misalignment are added (see 5.6);

s) The requirements for the actual pressure when using end seal plugs for hydrostatic

pressure tests are added (see 5.7);

t) The requirements for the re-test of the guided bending test are modified (see 5.8;

2 Pipes and Requirements Class B and GB/T 9711.3-2005 Petroleum and Natural Gas

Industries - Steel Pipe for Pipelines - Technical Delivery Conditions - Part 3.Pipes of

Requirements Class C are incorporated;

---Thirdly revised in 2017;

---This is the fourth revision.

1 Scope

This document specifies the manufacturing requirements for welded steel pipes (hereinafter

referred to as "welded pipes") and seamless steel pipes (hereinafter referred to as "seamless

pipes") for the pipeline transportation systems of petroleum and natural gas industries, which

include two product specification levels (PSL 1 and PSL 2).

2 Normative References

The contents of the following documents constitute indispensable clauses of this document

through the normative references in the text. In terms of references with a specified date, only

versions with a specified date are applicable to this document. In terms of references without a

specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 9253 Petroleum and Natural Gas Industries - Threading, Gauging and Thread Inspection

of Casing, Tubing, and Line Pipe Threads

3 Terms, Definitions, Symbols and Abbreviations

The terms, definitions, symbols and abbreviations defined in API Spec 5L.2018 are applicable

to this document.

4 Information Provided by the Purchaser

In addition to the provisions of Chapter 7 in API Spec 5L.2018, for a specific order batch, if

agreed upon, the order contract shall indicate which of the following terms apply.

5 Technical Requirements

If the pipe sections used for welding butt-joined steel pipes have been subjected to hydrostatic

pressure test and qualified before butt-joining, if agreed upon, the butt-joined steel pipes may

be exempted from the hydrostatic pressure test.

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