A Displacement Calculation Method During the Pigging Process of Stay Cables Spanning Structures of Natural Gas Pipelines

Abstract

The invention discloses a displacement calculation method in a pipeline cleaning process of a natural gas pipeline stay cable crossing structure. An existing method requires establishment of a finite element model and has a high requirement on professional literacy of a calculator. The displacement calculation method solves the problems as displacement in the pipeline cleaning process can be obtained rapidly through a calculation formula and based on basic parameters of the natural gas pipeline stay cable crossing structure. The displacement calculation method comprises the steps of collecting basic data of the natural gas pipeline stay cable crossing structure and a pipeline cleaning pre-arranged plan thereof; calculating a constant and an equivalent displacement length at a special position of the crossing structure 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 displacement at different positions. The displacement calculation method in the pipeline cleaning process of the natural gas pipeline stay cable crossing structure is simple and convenient; the calculation result can express a relational expression in which displacement of the stay cable crossing pipeline under the action of pipeline cleaning changes along with time; and a governance basis is provided for pipeline cleaning safety evaluation of the natural gas pipeline stay cable crossing structure.

Description

technical field [0001] The invention belongs to the field of design and safety assurance of natural gas transmission pipelines, and in particular relates to a displacement calculation method in the process of pigging a natural gas pipeline cable across a structure. Background technique [0002] The pipeline spanning structure is a construction project in which the conveying pipeline passes through the upper part of natural or artificial obstacles. It usually adopts a design method similar to that of a highway bridge. Since the 1970s, my country has begun to build cable-stayed spans pipe bridge. At present, the pipe bridge with the largest span in my country is still the 1,001-meter-long Zhongxian Yangtze River cable-stayed spanning structure built in 1977. [0003] For a newly built natural gas pipeline, it needs to be pigged before it is put into operation to remove the dirt and impurities left over from the construction process; Water accumulated during transportation. D...

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Problems solved by technology

Therefore, at present, no mature technology or calculation method has been adopted by the relevant standards of natural gas pipeline spanning structures, such as GB50459-2009 "Code for Design of Oil and Gas Transmission Pipeline Crossing Engineering", and it is difficult to carry out pigging safety for cable-stayed spanning structures. Evaluate

[0004] To sum up, the large displacement of the cable-stayed spanning structure of the natural gas pipeline during the pigging process is a major safety threat. However, there is no reasonable calculation method and technology to evaluate the displacement, and it is difficult to realize the Evaluation of the pigging safety of the cable-stayed spanning structure, there are defects in the production and operation of the pipeline

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