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A method for crack arrest of ductile fracture of natural gas pipeline

A natural gas pipeline and ductile fracture technology, which is applied in the field of natural gas pipeline ductile fracture arrest, can solve the problems of not being widely used worldwide, increasing on-site connection operations, and lack of technology and experience in the application of crack arresting rings, so as to reduce construction procedures , Improve safety and reliability, improve the effect of crack arrest ability

Active Publication Date: 2011-11-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of crack arrest not only requires the use of crack arrest rings, but also increases the on-site connection operation process, and there is no technology and experience in the application of crack arrest rings in my country, and it is not widely used worldwide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] For the natural gas transmission pipeline with a pressure of 10MPa and an outer diameter of φ1016, the design factor of 0.72 is adopted, and the normal pipeline design adopts X100 steel pipe with a thickness of 10.2mm. In order to ensure or improve the crack arrest performance of the pipeline, every 50 X100 pipes (each steel pipe is about 12 meters long) are connected with 2 X70 steel pipes with the same outer diameter, and the wall thickness is 14.6mm. For X100 pipeline steel pipes, excessive toughness is not proposed, if the Charpy impact energy is required to be greater than or equal to 120J. For the toughness of two X70 steel pipes, according to the Battelle hyperbolic method recommended by ISO 3183: 2007 "Petroleum and Natural Gas Industry-Steel Pipes for Pipeline Transmission Systems" or API Spec 5L: 2007 (44th Edition) "Pipeline Steel Pipe Specifications", taking into account all Based on the database results of physical blasting experiments, and taking into acco...

Embodiment 2

[0014] For natural gas pipelines with a pressure of 12MPa and an outer diameter of φ1219, the design factor of 0.72 is used, and the normal pipeline design uses X120 steel pipes with a thickness of 12.2mm. In order to ensure or improve the crack arrest ability of the pipeline, every 80 X120 pipes (each steel pipe is about 12 meters long) are connected with 3 X80 steel pipes with the same outer diameter, and the wall thickness is 18.4mm. For X120 pipeline steel pipe, the Charpy impact energy is required to be greater than or equal to 150J. For the toughness of the three X80 steel pipes, according to the Battelle hyperbolic method recommended by ISO3183: 2007 "Petroleum and Natural Gas Industry-Steel Pipes for Pipeline Transmission Systems" and API Spec 5L: 2007 (44th Edition) "Pipeline Steel Pipe Specifications", taking into account the full size Based on the database results of physical blasting experiments, and taking into account the influence of gaseous conditions and other...

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Abstract

The invention relates to a method for arresting ductile fracture of natural gas pipelines of level X100 and above, wherein two or more fracture arresting steel pipes, which are relatively low in strength level but relatively high in wall thickness and toughness, are connected among X100 or higher-level steel pipes at intervals of 50-100 steel pipes and by a length within a range of 600-1200 m; and the wall thickness of the fracture arresting steel pipe is calculated according to pressure bearing capacity the same as that of a main pipeline, while the toughness thereof is determined by a method recommended in Petroleum and Natural Gas Industries-Steel Pipe for Pipeline Transport System ISO 3183: 2007 and the appendix G of Pipeline Steel Pipe Standards (Version 44) API Spec5L: 2007. The manufacturing technical difficulty and the manufacturing cost of the fracture arresting steel pipe with low strength level and high toughness are low, and the toughness index thereof is easy to achieve, so that the safety requirements of the pipeline fracture arrest are met, and unification of safety and economical efficiency is realized.

Description

technical field [0001] The invention relates to a ductile fracture arresting method for X100 and above natural gas pipelines. Background technique [0002] In order to improve the economy of pipeline transportation, the development trend of natural gas pipelines is high pressure, large diameter, large wall thickness, and large transmission capacity, and the steel pipes used are also developing in the direction of high steel grade (high strength grade). Worldwide, long-distance natural gas pipelines currently under construction generally use steel pipes of grades X70 and below, X80 grade steel pipes have begun to be used on a large scale, and higher grades of ultra-high-strength (X100, X120) steel pipes have also been trial-applied . Pipeline steel pipes for natural gas pipelines in my country have developed very rapidly in recent years. The successful application of X70 grade steel pipes in pipeline projects such as the first West-East Gas Pipeline, the Second Shaanxi-Beiji...

Claims

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Application Information

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IPC IPC(8): F17D5/00
Inventor 李为卫
Owner BC P INC CHINA NAT PETROLEUM CORP
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