Method for dealing repeated fracture of industrial pipeline caused by thermal stress

A technology for industrial piping and thermal stress, applied in piping systems, blast furnace parts, furnaces, etc., to solve problems such as industrial piping fractures

Inactive Publication Date: 2010-09-29
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing technology does not give a systematic quantitative analysis and judgment technical procedure for this kind of industrial pipeline fracture fault.

Method used

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  • Method for dealing repeated fracture of industrial pipeline caused by thermal stress
  • Method for dealing repeated fracture of industrial pipeline caused by thermal stress
  • Method for dealing repeated fracture of industrial pipeline caused by thermal stress

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Embodiment Construction

[0068] The technical solution involved in the present invention is applied to the fracture repair of INBA system pipes of 6#-8# blast furnaces of WISCO.

[0069] Such as figure 1 , in the frequent fracture area of ​​the pipeline involved in the case, take the middle point of the straight pipe section with a span of 35 meters between the two fixed supports as the stress release point; take this point as the center mark, extend 1 meter to both sides respectively, as two Jog point marker B d , with an interval of 2 meters; on the floor where the two moving point marks are perpendicular to each other, set the static point reference mark B j . In the interval marked by the moving point, select a pipe section Bf of an appropriate length, cut it off and pull it out. After measurement, the fact that the moving point moves inward to the static point is obtained, and the total amount is an inward extension of 7 mm (named ΔL 1 ). Based on this, it can be confirmed that before this...

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Abstract

The invention relates to a method for dealing repeated fracture of an industrial pipeline caused by thermal stress. The method comprises the following steps of: judging a stress trend of the pipeline and quantifying a stress level thereof by testing an original deformation degree formed in a pipeline construction process; judging a limit expansion and contraction rate epsilon of an involved pipeline section according to a maximal temperature difference interval of a service environment of the pipeline; respectively quantifying various stress values borne by the involved pipeline section and a maximal cumulative stress intensity sigma respectively by using a linear rule of an elastic modulus E of a material; judging whether the involved pipeline section is safe by comparing the maximal cumulative stress intensity sigma with a usable intensity [sigma] of a pipeline material; and finally providing a measurable reinforcement scheme or a stress compensation scheme. The method has the advantages that: the analysis and the judgment of a pipeline fracture phenomenon in the field is converted into a quantitative analysis and judgment mode in a data form from a conventional experience judgment mode; and a practical solution is proposed.

Description

technical field [0001] The invention relates to a method for quantitative analysis, response and prevention of fracture faults of industrial pipelines, in particular to a method for coping with repeated fractures of industrial pipelines caused by thermal stress caused by temperature differences. Background technique [0002] In practical production, when the return water main pipe of some systems such as ironmaking blast furnace is running, frequent fractures of unknown reasons often occur. After many efforts, the on-site maintenance personnel are still unable to control the continuous occurrence of fracture events. The frequent occurrence of fracture failures without warning has seriously disturbed the production order of the blast furnace. To this end, a scientific analysis of the cause of the pipeline fracture was carried out. After excluding the hoop and longitudinal stresses during loading and the tensile stress imposed on the pipeline by the operating medium, the pipe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/02C21B7/00
Inventor 孙华陶铭鼎吴良玉颜斌孙光军
Owner 武钢集团有限公司
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