A Displacement Calculation Method During Pigging Process of Suspension Cable Spanning Structure of Natural Gas Pipeline

Abstract

The invention discloses a displacement calculation method in a pipeline cleaning process of a natural gas pipeline suspension cable crossing structure. An existing calculation method is poor in portability and difficult in solution. The displacement calculation method solves the problems as displacement in the pipeline cleaning process can be obtained rapidly through algebraic operation and based on basic parameters of the natural gas pipeline suspension cable crossing structure. The displacement calculation method comprises the steps of collecting basic data of the natural gas pipeline suspension cable crossing structure and a pipeline cleaning pre-arranged plan thereof; calculating an equivalent span length coefficient, a Froude number and an equivalent displacement length at a special position of the crossing pipeline based on the basic data; calculating the equivalent displacement length at any position based on an interpolation formula; and carrying the equivalent displacement length into a displacement curve calculation formula to obtain a relational expression in which displacement at different positions of the pipeline changes along with time in the pipeline cleaning process. The displacement calculation method in the pipeline cleaning process of the natural gas pipeline suspension cable crossing structure is simple and convenient; the calculation result can express a displacement amount of the crossing pipeline at different positions and at different time; and a governance basis is provided for pipeline cleaning safety evaluation of the natural gas pipeline suspension cable crossing structure.

Description

technical field [0001] The invention belongs to the field of design and safety assurance of natural gas pipelines, and in particular relates to a displacement calculation method in the pigging process of natural gas pipeline suspension cables spanning structures. Background technique [0002] The pipeline spanning structure is a construction project in which the transmission pipeline passes over natural or artificial obstacles, and is generally composed of pipelines, towers, cables and possible stiffening beams. In recent years, natural gas pipeline construction projects have developed rapidly, and a large number of suspension cable spanning structures with a span of more than 200m have been built and put into operation in my country, such as the suspension cable spanning of the Sichuan-East Gas Transmission Project, the suspension cable spanning of the China-Myanmar pipeline Nu River, and the Lancang River. [0003] Newly built natural gas pipelines need to be pigged before...

AI Technical Summary

Problems solved by technology

Although Duan Yinlong and other domestic scholars have conducted research on related issues, most of the research results are based on the finite element method. The model is not portable and cannot be generalized between different suspension cable spanning structures, and the solution is difficult and time-consuming. Easy to use in the field

Therefore, at present, no mature technology or calculation method has been adopted by the relevant standards of natural gas pipeline spanning structures, such as GB 50459-2009 "Code for Design of Oil and Gas Transmission Pipeline Crossing Engineering", and it is difficult to carry out pigging safety for suspension cable spanning structures. Evaluate

[0005] To sum up, the large displacement of the suspension cable spanning structure of the natural gas pipeline during the pigging process is a major security threat. The evaluation of pigging safety of cable spanning structure has defects in the production and operation of pipelines

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