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GB/T 9711-2023: Petroleum and natural gas industries -- Steel pipe for pipeline transportation systems
GB/T 9711-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75; 75.200
CCS E 16; H 48
Replacing GB/T 9711-2017
Petroleum and Natural Gas Industries - Steel Pipe for
Pipeline Transportation Systems
(ISO 3183:2019, MOD)
ISSUED ON: NOVEMBER 27, 2023
IMPLEMENTED ON: MARCH 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4
Introduction ... 8
1 Scope ... 9
2 Normative References ... 9
3 Terms, Definitions, Symbols and Abbreviations ... 9
4 Information Provided by the Purchaser ... 10
5 Technical Requirements ... 10
5.1 General ... 10
5.2 Grain Size, Banded Structure and Inclusions of PSL 2 Steel Pipes Resistant to Ductile
Fracture Propagation ... 10
5.3 Hydrostatic Pressure Test of Butt-joined Steel Pipes ... 10
5.4 Hardness Test of PSL 2 Steel Pipes ... 11
5.5 Maximum Allowable Outer Weld Bead Height at Pipe Ends of SAW Pipes and COW
Pipes ... 13
5.6 Location of Welds and HAZ Charpy Impact Test Specimens during Weld Misalignment
... 14
5.7 Requirements for Actual Pressure when Using End Seal Plugs for Hydrostatic Pressure
Test ... 14
5.8 Re-test of Guided Bending Test ... 15
5.9 Inspection of Skill Assessment of Repair Welding Operators ... 15
5.10 Equivalent Standard for Qualification Accreditation of Non-destructive Testing
Personnel ... 15
5.11 Equipment Calibration of Weld Radiographic Inspection ... 15
5.12 The European Pipeline Research Group (EPRG) Guidelines - Method 1 ... 16
5.13 Ordering of PSL 2 Steel Pipes for Pure Hydrogen Transmission Pipelines ... 21
5.14 Evaluation of Abnormal Fractures in Drop Weight Tear (DWT) Test ... 21
5.15 Markings ... 21
Appendix A (informative) Ordering of PSL 2 Steel Pipes for Pure Hydrogen
Transmission Pipelines ... 23
A.1 Overview ... 23
A.2 Additional Information Provided by the Purchaser ... 23
A.3 Manufacturing ... 24
A.4 Acceptance Limits ... 25
A.5 Surface Conditions, Imperfections and Defects ... 29
Petroleum and Natural Gas Industries - Steel Pipe for
Pipeline Transportation Systems
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).
This document is applicable to the manufacturing, inspection, marking, coating, recording and
loading of the welded pipes and seamless pipes for the pipeline transportation systems of
petroleum and natural gas industries. The manufacture and inspection of steel pipes for pure
hydrogen transportation pipelines may be carried out in accordance with this document.
This document does not apply to cast iron pipes.
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
TSG Z8001 Examination Rules for Nondestructive Testing Inspectors of Special Equipment
ISO 6507-1 Metallic Materials - Vickers Hardness Test - Part 1: Test Method
ISO 6508-1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method
API Spec 5L:2018 Line Pipe
ASTM E18 Standard Test Methods for Rockwell Hardness of Metallic Materials
ASTM E92 Standard Test Methods for Vickers Hardness and Knoop Hardness of Metallic
Materials
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:
a) The requirements for the grain size, banded structure and inclusions of PSL 2 steel
pipe raw materials resistant to ductile fracture propagation for gas transmission
pipelines (see 5.2);
b) Hydrostatic pressure test of butt-joined steel pipes (see 5.3);
c) Order PSL 2 steel pipes for pure hydrogen transmission pipelines (see Appendix A);
d) Evaluation of abnormal fractures by drop weight tear (DWT) test (see Appendix B).
5 Technical Requirements
5.1 General
Except for the supplementary requirements and exceptions specified in 5.2 ~ 5.15, as well as
Appendix A, Appendix L, Appendix O and Appendix P in API Spec 5L:2018, this document
shall be implemented in accordance with the relevant chapters of API Spec 5L:2018.
If there is no specific indication to which level of steel pipes a certain requirement applies, then,
the requirement applies equally to PSL 1 and PSL 2 steel pipes.
Unless otherwise agreed, if the purchaser selects multiple special-purpose supplementary
requirements based on the expected service conditions agreement, the steel pipes shall comply
with the most stringent requirements among the special-purpose supplementary requirements.
5.2 Grain Size, Banded Structure and Inclusions of PSL 2 Steel Pipes Resistant to
Ductile Fracture Propagation
When ordering PSL 2 steel pipes resistant to ductile fracture propagation for gas transmission
pipelines, if agreed upon, the requirements for the grain size, banded structure and inclusions
of the raw materials can be specified.
5.3 Hydrostatic Pressure Test of Butt-joined Steel Pipes
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.
calculated value using 90% of the minimum yield strength in accordance with Formula (6) in
API Spec 5L:2018.
5.8 Re-test of Guided Bending Test
If one or two specimens do not comply with the specified requirements, the manufacturer may
choose to intercept specimens from two steel pipes taken from the same test batch for re-test.
If these specimens comply with the specified requirements, except for the initially selected
sample pipes, all steel pipes from the test batch shall be accepted. If any re-test specimen does
not comply with the specified requirements, the manufacturer may choose to sample the
remaining steel pipes of the test batch one by one for testing.
For any disqualified steel pipe, the manufacturer may also conduct the re-test by cutting back
at the same end and taking twice the size of specimens. If the added specimens comply with the
specified requirements, then, the steel pipe will be accepted. If any of the added specimens does
not comply with the specified requirements, then, the steel pipe will be rejected and shall not
be cut back or re-tested again.
The specimens used for re-test shall be intercepted in accordance with the requirements of Table
19 in API Spec 5L:2018, Table 20 in API Spec 5L:2018 and 10.2.3.6 in API Spec 5L:2018.
If applicable, re-processing shall comply with the stipulations of 10.2.11 in API Spec 5L:2018.
5.9 Inspection of Skill Assessment of Repair Welding Operators
For the purpose of assessment, the repair welders or operators shall produce welds that pass the
following inspections:
a) Radiographic inspection in accordance with Appendix E in API Spec 5L:2018;
b) Two transversely guided bending tests (see D.2.3.3 in API Spec 5L:2018).
5.10 Equivalent Standard for Qualification Accreditation of Non-destructive
Testing Personnel
TSG Z8001 is the basic requirement for the qualifications of non-destructive testing personnel
(except appearance inspection), which is equivalent to the provisions of E.1.1 in API Spec
5L:2018.
5.11 Equipment Calibration of Weld Radiographic Inspection
5.11.1 If an ISO wire type image quality meter is used, the basic wire diameter of the wire type
image quality meter used for real-time radiographic imaging inspection is specified in Table 3.
5.13 Ordering of PSL 2 Steel Pipes for Pure Hydrogen Transmission Pipelines
Please refer to Appendix A for ordering PSL 2 steel pipes for pure hydrogen transmission
pipelines.
5.14 Evaluation of Abnormal Fractures in Drop Weight Tear (DWT) Test
When an abnormal fracture appears in the drop weight tear (DWT) test, abnormal fractures
should be evaluated in accordance with Appendix B.
5.15 Markings
5.15.1 Markings of steel pipes
When applicable, the steel pipe markings shall contain the following information in order.
a) The name or mark (X) of steel pipe manufacturers;
b) When the product completely complies with the requirements of this document, it
shall be marked with “GB/T 9711”. Products that comply with multiple compatible
standards may be marked with the title of each standard.
c) Specified outer diameter.
d) Specified wall thickness.
e) Steel grade of steel pipes (steel name) (see Table 1, Table H.1, Table J.1 and Table
N.1 in API Spec 5L:2018, or Table A.1 of this document, choose whichever is
applicable). The steel grade of PSL 2 steel pipes shall contain the as-rolled letters (R,
N, Q or M).
f) Product specification levels (PSL 1 or PSL 2). For example, if Appendix G in API
Spec 5L:2018 applies (see G.5.1 in API Spec 5L:2018), the PSL mark is followed by
the letter G.
g) Type of steel pipes (see Table 2 in API Spec 5L:2018).
h) When applicable, the marking (Y) of the purchaser’s inspection representative.
i) When applicable, an identification code indicating the relations between a product or
delivery unit (for example, a bundle of steel pipes) and the corresponding inspection
document, for example, the pipe code (Z).
j) When the specified hydrostatic test pressure is higher than the applicable pressure in
Table 24 or Table 25 in API Spec 5L:2018, or exceeds the applicable test pressure in
Footnote a, Footnote b or Footnote c of Table 26 in API Spec 5L:2018, the word
“TESTED” shall be indicated at the end of the mark, followed by the specified test
pressure value [unit: (MPa)].
Appendix A
(informative)
Ordering of PSL 2 Steel Pipes for Pure Hydrogen Transmission Pipelines
A.1 Overview
This Appendix specifies the additional terms [see Chapter 4 c)] applicable to PSL 2 steel pipes
for pure hydrogen transmission pipelines with hydrogen purity not less than 99.99%, outer
diameter not greater than 610 mm and steel grade not higher than L360/X52.
Pure hydrogen transmission pipelines do not include the following hydrogen transmission
pipelines:
a) Pipes with a temperature higher than 232 C or lower than 62 C;
b) Pipes with a pressure higher than 21 MPa;
c) Pipes with a water content greater than 20 mL/m3.
A.2 Additional Information Provided by the Purchaser
In addition to the provisions of 7.1 a) ~ g) in API Spec 5L:2018, the order contract should
indicate which of the following terms applies to a specific order batch:
a) Chemical composition of intermediate steel grades (see A.4.1.1);
b) Chemical composition of steel pipes t > 25.0 mm (see A.4.1.2);
c) Limitations of chemical composition (see Table A.1, Footnotes a ~ f);
d) Inspection frequency of weld hardness test of HFW pipes and SAW pipes (see Table
A.5);
e) Gaseous hydrogen compatibility test (see A.7.2);
f) Differences from the specified hardness test (see A.7.4.2.2 and A.7.4.2.3);
g) Differences from 4 hardness indentations [see A.7.4.2.2 c)];
h) Ultrasonic detection of delamination imperfections within the length range of 100 mm
from the end of the steel pipe, t  5.0 mm (see K.2.1.3 in API Spec 5L:2018);
i) NDT delamination acceptance limits of additional pipe end (see K.2.1.3 and K.2.1.4
in API Spec 5L:2018);
j) Magnetic particle inspection for delamination imperfections on the end face / bevel
of each steel pipe (see K.2.1.4 in API Spec 5L:2018);
k) Delamination size / density verification (see K.3.2.2 in API Spec 5L:2018);
l) Increase in the measurement range of ultrasonic wall thickness of seamless pipes (see
K.3.3 in API Spec 5L:2018);
m) One or more supplementary non-destructive testing of seamless pipes (see K.3.4 in
API Spec 5L:2018);
n) Ultrasonic detection of transverse imperfections of seamless pipes (see K.3.4.1 in API
Spec 5L:2018);
o) Magnetic flux leakage detection of longitudinal and transverse imperfections in the
entire body of seamless pipes (see K.3.4.2 in API Spec 5L:2018);
p) Eddy current testing of the entire body of seamless pipes (see K.3.4.3 in API Spec
5L:2018);
q) Magnetic particle inspection of the entire body of steel pipes (see K.3.4.4 in API Spec
5L:2018);
r) Limitations on single delamination size of an area 100 mm2 (see Table K.1 in API
Spec 5L:2018);
s) U2/U2H acceptance level for non-destructive testing of ISO 10893-11 HFW pipe
welds (see K.4.1 in API Spec 5L:2018);
t) Replaceable ISO 10893-10 HFW ultrasonic testing acceptance limits for welds [see
K.4.1 b) in API Spec 5L:2018];
u) Ultrasonic detection of delamination imperfections in HFW pipe bodies (see K.4.2 in
API Spec 5L:2018);
v) Ultrasonic detection of delamination imperfections at the edge of steel strip / plate or
adjacent weld area (see K.4.3 in API Spec 5L:2018);
w) Ultrasonic or magnetic flux leakage non-destructive testing of HFW pipe bodies (see
K.4.4 in API Spec 5L:2018);
x) Calibrate equipment using fixed-depth notches [see K.5.1.1 c) in API Spec 5L:2018];
y) Radiographic inspection of pipe ends (untested ends) and repair areas [see K.5.3 a) in
API Spec 5L:2018];
z) Magnetic particle inspection of SAW pipe end welds (see K.5.4 in API Spec 5L:2018).
A.3 Manufacturing
All steel pipes can be produced in accordance with the manufacturing pr...