GB/T 29168.2-2024Petroleum and natural gas industries - Bends, fittings and flanges for pipeline transportation systems - Part 2: Fittings (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 is Part 2 of GB/T 29168 "Pipe elbows, fittings and flanges for pipeline transportation systems in the petroleum and natural gas industry".

GB/T 29168 has published the following parts.

--- Part 1: Induction heating pipe bending;

--- Part 2: Pipe fittings;

--- Part 3: Flanges;

--- Part 4: Cold-bent pipes.

This document replaces GB/T 29168.2-2012 "Induction heating elbows, pipe fittings and pipe methods for pipeline transportation systems in the petroleum and natural gas industry" Compared with GB/T 29168.2-2012, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) Added chemical composition index requirements for pipe fittings for low temperature environments (see 9.4);

b) Added protection requirements for pipe fittings (see Chapter 11);

c) Added packaging and transportation requirements for pipe fittings (see Chapter 12).

This document is modified to adopt ISO 15590-2:2021 "Factory elbows, fittings and flanges for pipeline transportation systems in the petroleum and natural gas industry" Part 2: Pipe fittings.

Compared with ISO 15590-2:2021, this document has many structural adjustments. The structural number changes between the two documents are listed below.

See Appendix A for the table.

This document has many technical differences compared to ISO 15590-2:2021.

A list of these technical differences and their reasons is given in Appendix B.

The following editorial changes were made to this document.

--- In order to coordinate with the existing standards, the name of the standard is changed to "Bends, pipe fittings and pipes for pipeline transportation systems in the petroleum and natural gas industry Part 2: Pipe fittings;

--- Deleted the note of 7.1;

--- Changed the original Figures 1, 2 and 3 to Figures 1a), b) and c);

--- Deleted the note of 9.6.3.1;

--- Added the note to C.1;

--- Added Appendix E (informative) "Recommended wall thickness for DN1000 and DN1200 tee design verification test";

--- Added Appendix F (informative) "Sleeve connection";

--- Added Appendix H (informative) "Steel Grade Comparison";

--- Added Appendix I (informative) "Pipe fittings dimensions";

--- Added Appendix J (informative) "Test method for geometric dimensions of tee joints".

Introduction

Bends, pipe fittings and flanges are important and indispensable structural parts for the construction of long-distance pipelines and valve chambers at stations.

The procurement and application of pipes for industrial pipeline transportation systems have been formulated for induction heating bends, pipe fittings, this document is based on ISO 15590-2, and refers to relevant domestic and foreign standards.

The research results and practical experience of basic research and technical standards for pipe fittings used in oil and gas pipeline construction.

GB/T 29168 is planned to consist of four parts, including production process, geometric dimensions and inspection requirements.

--- Part 1: Induction heating pipe bending. The purpose is to specify the application of carbon steel or low alloy steel seamless steel pipe, high frequency welded pipe and straight seam buried pipe Technical requirements for the design, manufacture and inspection of induction heating bends made from arc-welded steel pipe as parent pipe.

--- Part 2: Pipe fittings. The purpose is to specify the pipe fittings applicable to the use of carbon steel or low alloy steel plates, seamless steel pipes and welded steel pipes.

Technical requirements for the manufacture and inspection of welded pipe fittings.

--- Part 3: Flanges. The purpose is to specify neck welding flanges and blind flanges suitable for carbon steel or low alloy steel forgings, as well as anchoring Technical requirements for the manufacture and inspection of flanges, slip-on flanges and orifice flanges.

--- Part 4: Cold-bent pipes. The purpose is to specify the radius of application of low-carbon low-alloy seamless and welded steel pipes not less than 5OD, Technical requirements for the design, manufacture and inspection of cold-bent pipe produced by cold bending in factories and on site.

During the construction of pipeline engineering, in order to meet the needs of medium diversion, and relief, and improve the main steel pipe in the pipeline system under harsh loads, Due to the abnormal external loads, a large number of pipeline structures are often required in the construction of pipeline laying, valve rooms, stations and booster stations.

Pipeline structural parts can be divided into elbows, pipe fittings and flanges according to their geometric shapes and application environments.

Different, pipe bending can be divided into induction heating pipe bending and cold bending, tees can be divided into welding tees, hot extrusion tees, cold pressing tees, etc.

GB/T 29168 is divided into four parts based on factors such as type, geometry, production and processing technology, and inspection requirements.

According to the different requirements of pipe processing technology, the pipe bending is divided into the first part, induction heating pipe bending and the fourth part, cold bending; the second part is made of carbon steel or Technical requirements for pipe fittings made of low alloy steel seamless pipes and welded steel pipes, such as elbows, caps, tees, reducers, etc.; Part 3 is Technical requirements for carbon steel and low alloy steel forged flanges.

Bend pipes for oil and gas industry pipeline transportation systems, Pipe fittings and flanges Part 2: Pipe fittings

1 Scope

This document specifies the manufacture, testing and inspection of pipe fittings for pipeline transportation systems designed in accordance with GB 50251, GB 50253 and GB/T 24259.

Inspection, technical requirements, marking, protection, packaging and transportation, etc.

This document applies to butt-welded pipe fittings (such as elbows, pipe caps, the manufacture and inspection of pipe fittings for piping systems designed in accordance with other specifications shall refer to use.

This document does not apply to the selection of shop welding materials or accessories.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB 150.3 Pressure Vessels Part 3: Design GB/T 228.1 Tensile tests on metallic materials - Part 1: Test methods at room temperature (GB/T 228.1-2021, ISO 6892-1.

2019,MOD)

GB/T 228.2 Tensile tests on metallic materials Part 2: High temperature test methods (GB/T 228.2-2015, ISO 6892-2.

2011,MOD)

GB/T 229 Charpy pendulum impact test method for metallic materials (GB/T 229-2020, ISO 148-1:2016, MOD) GB/T 232 Metallic materials bending test method (GB/T 232-2010, ISO 7438:2005, MOD) GB/T 713.2 Steel plates and strips for pressure equipment Part 2: Non-alloy steels and alloy steels with specified temperature properties GB/T 2970 Ultrasonic testing method for thick steel plates GB/T 2975 Sampling location and specimen preparation for mechanical properties tests of steel and steel products (GB/T 2975-2018, ISO 377.

2017,MOD)

GB/T 4157 Laboratory test method for resistance of metals to sulfide stress cracking and stress corrosion cracking in hydrogen sulfide environments GB/T 4340.1 Metallic materials Vickers hardness test Part 1: Test method (GB/T 4340.1-2024, ISO 6507-1:2023,MOD) GB/T 6394-2017 Determination of average grain size of metals GB/T 8650 Evaluation method for resistance of pipeline steel and pressure vessel steel to hydrogen induced cracking GB/T 9445 Qualification and certification of nondestructive testing personnel (GB/T 9445-2024, ISO 9712:2021, IDT) GB/T 9711 Steel pipes for pipeline transportation systems in the petroleum and natural gas industries (GB/T 9711-2023, ISO 3183:2019, MOD) GB/T 11345 Ultrasonic testing technology, testing levels and assessment for non-destructive testing of welding (GB/T 11345-2013, ISO 17640-11:2010,MOD) GB/T 12467.2 Quality requirements for fusion welding of metallic materials Part 2: Complete quality requirements (GB/T 12467.2-2009, ISO 3834-2:2005,IDT) GB/T 17600.1 Elongation conversion of steel Part 1: Carbon steel and low alloy steel (GB/T 17600.1-1998,