GB/T 29168.1-2021Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 1: Induction bends (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 of Standardization Documents"

Drafting.

This document is Part 1 of GB/T 29168 "Induction Heating Elbows, Fittings and Flanges for Pipeline Transportation Systems in the Petroleum and Natural Gas Industry"

point. GB/T 29168 has released the following parts.

---Part 1.Induction heating elbow;

---Part 2.Pipe fittings;

---Part 3.Flange.

This document replaces GB/T 29168.1-2012 "Induction heating bends, fittings and flanges for pipeline transportation systems in the oil and gas industry

Part 1.Induction Heating Elbow. Compared with GB/T 29168.1-2012, this document has major technical changes except for editorial changes

as follows.

---The scope of application of the document has been revised, and the content has been supplemented and improved (see Chapter 1);

--- The consistency requirement has been deleted (see Chapter 2 of the.2012 edition);

--- Deleted part of the content of negotiating and repairing the defects of the base metal (see Chapter 10 of the.2012 edition);

---Added the requirements of GB 50251 and GB 50253 related documents, and added the requirements of unequal strength design clauses (see Chapter 6);

---The mechanical performance index of the material of the elbow mother tube has increased the index requirements for the acceptance of the induction heating elbow heat simmering simulation test sample

Requires clear requirements for the ultimate water pressure bearing capacity of the elbow pipe (see Chapter 8);

---Modified the outer diameter of the LSAW pipe in the tube type selection of the elbow pipe (see Chapter 9);

---Modified the specific techniques for sampling locations and machining methods of mechanical properties such as tensile test, Charpy impact toughness test, hardness, etc.

Technical requirements (see Chapter 10);

---Added the clause requirements for layered rectangular specimens of elbows with wall thickness greater than 25mm (see Chapter 10);

---Added the recommended test temperature requirements for the selection of buried and non-buried Charpy impact toughness test temperatures (see Chapter 10);

---The acceptance requirements for specific technical indicators of mechanical properties such as tensile test, Charpy impact toughness test and hardness have been added (see Chapter 10);

---Added the requirements for the sampling position of the longitudinal submerged arc welded elbow with the nominal wall thickness of the parent tube greater than 25mm, and increased the test and detection requirements (see

Chapter 10).

This document is revised and adopted ISO 15590-1.2018 ``Induction heating elbows, fittings and flanges for pipeline transportation systems in the oil and gas industry

Part 1.Induction Heating Elbow.

Compared with ISO 15590-1.2018, this document has more structural adjustments. Appendix A lists this document and ISO 15590-1.

2018 chapter number comparison list.

Compared with ISO 15590-1.2018, this document has technical differences.

The vertical single line (︱) of the position is marked, and a list of the corresponding technical differences and their reasons is given in Appendix B.

Introduction

Induction heating elbows, pipe fittings and flanges are indispensable and important reversing structural parts for the construction of long-distance pipelines and station valve chambers. They are standard stones.

The procurement and application of pipes for pipeline transportation systems in the oil and natural gas industry have formulated induction heating bends for pipeline transportation systems in the oil and gas industry.

A series of technical documents for pipes, fittings and flanges. In the formulation of this document, the relevant domestic and foreign standards such as ISO 15590-1 have been referred to, and the

In recent years, the research results and practical experience of applied basic research and technical standards for elbows used in the construction of oil and gas pipeline engineering. According to product category

Type, production process, geometry and inspection requirements and other factors, GB/T 29168 "Induction heating bend for pipeline transportation system in petroleum and natural gas industry

Pipes, fittings and flanges are divided into 4 parts.

---Part 1.Induction heating elbow;

---Part 2.Pipe fittings;

---Part 3.Flanges;

---Part 4.Factory cold bend pipe.

In the process of pipeline construction, in order to meet the requirements of diversion, direction change and mitigation of the transmission medium, and to improve the pipeline system under severe load, the main line steel pipe

The effect of the abnormal external load on the pipeline often requires a large number of pipeline structures in the on-site construction of pipelines, valve chambers, station yards and pressurized stations.

Pieces. Pipeline structural parts can be divided into elbows, pipe fittings and flanges according to their geometry and application environment. According to the production process and processing method

Different, elbows can be divided into induction heating elbows and cold elbows, tees can be divided into welding tees, hot press tees and so on. This document combines product categories

Based on factors such as type, geometry, production and processing technology, and inspection requirements, the GB/T 29168 "Petroleum and Natural Gas Industry Pipeline Transmission

Induction heating elbows, pipe fittings and flanges for the delivery system are divided into four parts. According to the different requirements of the elbow processing technology, this document

Divided into the first part of induction heating elbow and the fourth part of cold elbow. Part 2 is the use of carbon steel or low alloy steel seamless steel pipes and welded steel pipes

Technical requirements for manufactured pipe fittings, such as elbows, pipe caps, tees, reducers and other products. Part 3 is the pipeline transportation system of the oil and gas industry

Technical requirements for forged flanges of carbon steel and low-alloy steel.

For oil and gas industry pipeline transportation system

Induction heating elbows, fittings and flanges

Part 1.induction heating elbow

1 Scope

This document specifies the design, materials, manufacturing process, mechanical properties, testing and

Inspection, marking, transportation, storage and protection requirements.

The elbow made in accordance with the provisions of this document is suitable for natural gas, crude oil and

Refined oil pipelines required by product standards.

This document is applicable to induction heating with carbon steel or low-alloy steel seamless steel pipes, high-frequency welded pipes and longitudinal submerged arc welded steel pipes as the parent pipe.

Hot elbow.

Note. These materials are typical C-Mn steel or low-alloy steel, consistent with the strength level of GB/T 9711-2017 and ISO 3183.2019 line pipe.

The two product specification levels (PSL) of induction heating bends specified in this document are consistent with GB/T 9711-2017 and ISO 3183.2019.

correspond.

This document does not apply to elbows for pipelines produced by other processes.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

GB/T 228.1 Tensile test of metallic materials Part 1.Room temperature test method (GB/T 228.1-2010, ISO 6892-1.

2009, MOD)

GB/T 228.2 Tensile test of metallic materials Part 2.High temperature test method (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 230.1 Rockwell hardness test of metallic materials Part 1.Test method (GB/T 230.1-2018, ISO 6508-1.

2016, MOD)

GB/T 232 Bend test method for metallic materials (GB/T 232-2010, ISO 7438.2005, MOD)

GB/T 4157-2017 Laboratory test method for resistance to sulfide stress cracking and stress corrosion cracking of metals in hydrogen sulfide environment

GB/T 4335 Low-carbon steel cold-rolled sheet ferrite grain size determination method

GB/T 4340.1 Vickers hardness test of metallic materials Part 1.Test method (GB/T 4340.1-2009, ISO 6507-

1.2005, MOD)

GB/T 6394 Method for determination of average grain size of metals

GB/T 8650-2015 Pipeline steel and pressure vessel steel resistance to hydrogen-induced cracking assessment method

GB/T 8923.1 Visual assessment of surface cleanliness of steel surface treatment before coating-Part 1.Uncoated steel

The corrosion grade and treatment grade of the surface and the steel surface after the original coating has been completely removed (GB/T 8923.1-2011, ISO 8501-1.

2007, IDT)