Method and system for calculating gas pipeline completeness evaluation period

A technology for evaluating cycle and gas pipelines, applied in the field of calculation methods and systems for evaluating cycle integrity of gas pipelines, and can solve problems such as increasing pipelines, strict management of pipeline integrity, and affecting the safe use of pipelines.

Active Publication Date: 2014-08-13
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

[0003] In the case of constant delivery pressure and pipe diameter, increasing the strength design factor will reduce the wall thickness of the pipe and increase the stress of the pipe, which will make the critical defect limit size, puncture resistance, stress corrosion cracking sensitivity, The reliability level and risk level have certain changes, which will affect the safe use of pipelines. Therefore, the integrity management of pipelines will be more stringent, and the existing pipeline integrity evaluation cycle will not be able to meet the normal and safe operation and maintenance of pipelines. needs
At present, there are no relevant reports at home and abroad on the calculation method of pipeline integrity evaluation cycle with higher strength design coefficient

Method used

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  • Method and system for calculating gas pipeline completeness evaluation period
  • Method and system for calculating gas pipeline completeness evaluation period
  • Method and system for calculating gas pipeline completeness evaluation period

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Embodiment

[0128] A high-strength design coefficient test section in the first-level area of ​​the third West-East Gas Pipeline, the strength design coefficient is 0.8, the pipe specification is Ф1219×16.5mm, spiral seam welded pipe, the steel grade is X80, the minimum yield strength SMYS is 555MPa, and the pipeline operating pressure It is 12MPa, compared with the Ф1219×18.4mm main line of the first-level area of ​​the second West-East Gas Pipeline, only the wall thickness of the pipeline is reduced, and the steel grade and operating pressure of the pipeline remain unchanged. For this pipeline, the calculation method of the integrity evaluation period provided by the embodiment of the present invention is:

[0129] Step 1: Establish the limit state function.

[0130] Z = σ f ( 1 - Δt t 0 ) ...

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Abstract

The invention relates to the technical field of pipeline evaluation, and discloses a method and a system for calculating a gas pipeline completeness evaluation period. According to the method and the system, a reliability index after the improvement of a strength design coefficient is calculated by establishing a gas pipeline corrosion thinning ultimate-state function, a mean value function of the gas pipeline corrosion thinning ultimate-state function, and a standard deviation function of the gas pipeline corrosion thinning ultimate-state function; a reliability index reduction ratio is further obtained through calculation; finally, the correction adjustment is implemented on the gas pipeline completeness evaluation period with a known strength design coefficient, so that the gas pipeline completeness evaluation period with a higher strength design coefficient is obtained; therefore suggestions are provided for the completeness management and maintenance of pipelines; the demands of gas pipeline completeness evaluation are met.

Description

technical field [0001] The invention relates to the technical field of pipeline evaluation, and is mainly applicable to a calculation method and system for the integrity evaluation cycle of gas transmission pipelines. Background technique [0002] How to minimize the cost of pipeline construction and improve the efficiency of pipeline transportation without affecting the safety and reliability of pipelines has always been a long-term concern of pipeline construction investors and pipeline operators. At present, two methods are mainly adopted in the world to reduce costs and improve pipeline transportation efficiency. One method is to use high-grade steel-grade large-diameter high-pressure gas transmission pipelines, and the other method is to increase the strength design coefficient of pipelines. As early as the 1950s and 1960s in North America, research and application work on improving the strength design factor began. For example, Canada’s CSA Z662 and the United States’ ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 王珂罗金恒张广利谌贵宇李丽锋张良
Owner BC P INC CHINA NAT PETROLEUM CORP
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