A Calculation Method and System for Integrity Evaluation Period of Gas Transmission Pipeline

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’ ...

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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

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