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Method for checking static strength of connecting pipe bearing internal pressure and various external loads

A static strength and calibration technology, applied in the field of pressure equipment, can solve problems such as no data calibration method

Inactive Publication Date: 2021-08-24
HARBIN ELECTRIC POWER GENERATION EQUIP NAT ENG RES CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there is no information on the static strength check of the primary stress of the connecting pipe far away from the opening reinforcement area of ​​the pressure equipment, and there is no data to give a clear check method
Especially when the static strength of the pipe is subjected to external loads, there is no data to give the exact method of checking.

Method used

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  • Method for checking static strength of connecting pipe bearing internal pressure and various external loads
  • Method for checking static strength of connecting pipe bearing internal pressure and various external loads
  • Method for checking static strength of connecting pipe bearing internal pressure and various external loads

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specific Embodiment approach 1

[0079] Specific implementation mode one: combine Figure 1-Figure 4 Describe this embodiment, a method for checking the static strength of a connecting pipe subjected to internal pressure and various external loads in this embodiment, including a connecting pipe 1, the connecting pipe 1 is a reduced-diameter connecting pipe, and the connecting pipe 1 includes a thin pipe section, a variable-diameter section The connection between the thick pipe section, the thin pipe section and the variable diameter section is the position with the lowest strength, that is, the b-b section, check the strength of the b-b section, and the strength of the connection can be guaranteed. The thin pipe section is connected to the pipeline, and the thick pipe section is connected to the pressure-bearing shell wall , the variable diameter of the connecting pipe 1 is a b-b section, characterized in that the specific check method includes the following steps:

[0080] Step ⅰ, checking the wall thickness...

specific Embodiment approach 2

[0084] Specific implementation mode two: combination Figure 1-Figure 4 Describe this embodiment, a method for checking the static strength of a connecting pipe that bears internal pressure and various external loads in this embodiment, in the step i, check the wall thickness δ of the connecting pipe b-b section nt The methods include:

[0085] Step ⅰ1. Check the connection and calculate the internal pressure P C ;

[0086] P C ≤0.4[σ] t φ(1);

[0087] where [σ] t - allowable stress at material design temperature, φ - welding joint coefficient;

[0088] Step ⅰ2, taking over the wall thickness δ nt ;

[0089]

[0090] In the formula, d i - take over check section inner diameter, figure 2 δ in n It is the wall thickness actually selected for the pipe.

specific Embodiment approach 3

[0091] Specific implementation mode three: combination Figure 1-Figure 4 Describe this embodiment, a method for checking the static strength of a nozzle that bears internal pressure and various external loads in this embodiment, in the step ii, check the equivalent film and pure Methods for shear stress values ​​include:

[0092] Step ⅱ1. Calculate the hoop membrane stress σ generated on the b-b section wall of the connecting pipe due to the internal pressure θ ;

[0093]

[0094] In the formula, K-the ratio of the outer diameter to the inner diameter of the connecting pipe;

[0095] Step ii2. Calculate the axial membrane stress σ produced by the internal pressure on the b-b section wall of the connecting pipe LP ;

[0096]

[0097] Step ii3. Calculate the radial membrane stress σ produced by the internal pressure on the b-b section wall of the connecting pipe rP ;

[0098]

[0099] Step ii4. Calculate the axial bending membrane stress σ produced by the load be...

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Abstract

The invention relates to a method for checking static strength of a connecting pipe bearing internal pressure and various external loads, and belongs to the technical field of pressure-bearing equipment. A device comprises a connecting pipe, the connecting pipe is a reducing connecting pipe, the reducing position of the connecting pipe is a b-b section, and the specific checking method comprises the following steps: i, checking the wall thickness of the connecting pipe; ii, checking the membrane and pure shear stress value of the b-b section of the connecting pipe; iii, checking membrane bending and pure shear stress values of the b-b section of the connecting pipe; and iv, deducing a membrane bending stress limit value coefficient alpha. The one-time and one-time film bending and pure shearing stress checking method of the checking section of the connecting pipe is clear, the confusion of designing such parts by engineering designers is solved, and the method is feasibly applied to actual design activities.

Description

technical field [0001] The invention relates to a method for checking the static strength of a connecting pipe, which belongs to the technical field of pressure-bearing equipment. Background technique [0002] At present, there is no data to provide a clear method for the static strength check of the primary stress of the connecting pipe far away from the hole reinforcement area of ​​the pressure equipment. In particular, there is no information on the check of the static strength when the pipe is subjected to external loads to give an exact check method. [0003] Based on the above problems, it is urgent to propose a method for checking the static strength of the connecting pipe under internal pressure and various external loads, so as to solve the above technical problems. Contents of the invention [0004] The present invention provides a method for checking the static strength of the pipe under internal pressure and various external loads, the purpose of which is to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F119/14
CPCG06F30/17G06F2119/14
Inventor 邱砚明徐树林牟力波支南徐文吉范业娇刘艳鹏
Owner HARBIN ELECTRIC POWER GENERATION EQUIP NAT ENG RES CENT CO LTD
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