A Calculation Method for Ultimate Internal Pressure of Elbows Containing Double Defects in Supercharging Station

Abstract

The invention discloses a method for calculating the limit internal pressure of a double-defect elbow in a supercharging station, which comprises the following steps: firstly, according to the data of the elbow in the supercharging station, the basic data of the elbow and the defect of the elbow are determined, and then according to the axial Judgment conditions for the limit distance of interaction with the circumferential direction, to determine whether there is mutual influence between the defects, if the mutual influence between the defects is small, it can be processed according to the calculation method of a single defect, if the mutual influence between the defects cannot be ignored, then the bending The limit internal pressure of the pipe must consider the mutual influence between the defects; the present invention reveals the influence of the mutual influence between the double defects on the ultimate load of the bend, and determines the critical distance for the mutual influence between the double defects, and proposes a method suitable for the supercharging station The prediction formula of the ultimate load of the double-defect elbow is of great significance for ensuring the safe operation of the pipeline and reducing economic losses.

Description

technical field [0001] The invention relates to a method for calculating the limit internal pressure of a bend with defects in a supercharging station, in particular to a method for calculating the limit internal pressure of a bend with double defects. Background technique [0002] At present, researchers at home and abroad generally have two analysis methods for the study of the ultimate load of elbows with defects: the first is to propose a calculation method for the ultimate internal pressure of elbows with defects based on the straight pipe formula, and the second is based on the limited The calculation formula of the limit internal pressure is obtained by fitting the meta-results; however, the influence of a single defect on the limit load of the elbow is mainly considered, and the defects caused by corrosion and erosion of the actual pipeline often appear in the form of double defects and multiple defects. 1. In the case of multiple defects, adjacent defects may intera...

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Problems solved by technology

[0002] At present, researchers at home and abroad generally have two analysis methods for the study of the ultimate load of elbows with defects: the first is to propose a calculation method for the ultimate internal pressure of elbows with defects based on the straight pipe formula, and the second is based on the limited The calculation formula of the limit internal pressure is obtained by fitting the meta-results; however, the influence of a single defect on the limit load of the elbow is mainly considered, and the defects caused by corrosion and erosion of the actual pipeline often appear in the form of double defects and multiple defects. 1. In the case of multiple defects, adjacent defects may interact with each other, resulting in inaccurate calculations based on the single-defect elbow limit internal pressure formula

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