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Method for calculating design pressure of a pipe fitting and a method for determining wall thickness of the pipe fitting

A design pressure and calculation method technology, which is applied to the calculation of the design pressure of pipe fittings and the field of determining the wall thickness of pipe fittings, can solve the problems that the design pressure of pipe fittings cannot be determined, the wall thickness of pipe fittings cannot be calculated, and the wall thickness of elbows cannot be obtained, etc., to achieve Guarantee design life and safety, avoid too thick waste, avoid one-sided effect

Active Publication Date: 2019-04-19
XINDI ENERGY ENG TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0026] In the order list, according to the sign of the elbow, the parameters D and R are known, C is specified in the order document, I can be calculated according to R, and Φ and Y can be obtained from the table in GB / T20801.3, but " P—the design pressure of the elbow” is not known, and the wall thickness of the elbow cannot be obtained
[0027] It can be seen that the design pressure of the pipe fitting cannot be determined according to the pipe fitting mark, and the wall thickness of the pipe fitting cannot be calculated.
Without the calculated wall thickness of the pipe fittings, the strength cannot be guaranteed

Method used

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  • Method for calculating design pressure of a pipe fitting and a method for determining wall thickness of the pipe fitting
  • Method for calculating design pressure of a pipe fitting and a method for determining wall thickness of the pipe fitting
  • Method for calculating design pressure of a pipe fitting and a method for determining wall thickness of the pipe fitting

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Embodiment

[0083] A method for calculating the design pressure of a pipe fitting, the method comprising:

[0084] (1) Welding elbows are selected for pipe fittings, and the external pipes are connected by butt welding. The elbow code in the order list is: 90o elbow 28”R=1.5DN ASTM A403-WP304 / 304L-WX BW ASME B16.9(RT : 100%) Sch10, from which it can be determined that the external pipe material connected with the pipe fittings is WP304 / 304L and the pipe table number is Sch10;

[0085] (2) Check ASME B36.10M according to the pipe table number, and obtain the nominal thickness of the connected steel pipe: 7.92mm

[0086] (3) Apply the design pressure calculation formula of the pipe fittings

[0087] Among them, the allowable stress of S-pipe at room temperature can be obtained from Table A.1 in GB / T20801.2: S=138MPa

[0088] Φ—weld coefficient, take Φ=1.

[0089] t—nominal thickness of steel pipe, 7.92mm

[0090] C—the additional amount of wall thickness of the steel pipe, C=C1+C2, C1...

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Abstract

The invention provides a method for calculating design pressure of a pipe fitting and a method for determining the wall thickness of the pipe fitting by calculating the design pressure value of the pipe fitting. the pipe fitting strength needs to be the same as the pipeline strength; the design pressure of the pipe fitting is determined according to the specification and material of the pipeline;according to the pipe fitting code in the pipe fitting ordering list; an external pipeline material connected with the pipe fitting and a pipe meter number are determined; according to the 2.1 ASME B < 16.9 > strip, determining the weld coefficient of the external pipeline; and the design pressure of the pipe fitting is obtained through calculation according to the formula (shown in the specification), and then the thickness of the pipe fitting is further calculated. According to the calculation method, the construction cost is reduced, and the safety of a pipeline system is ensured.

Description

technical field [0001] The invention belongs to the petroleum and natural gas industry, and in particular relates to a method for calculating the design pressure of a pipe fitting and a method for determining the wall thickness of the pipe fitting by calculating the design pressure value of the pipe fitting. Background technique [0002] There are a large number of pipe fittings in the pipeline, including elbows, tees and reducers, etc. The pipe fittings are a weak part in the pipeline: a. Affected by the deformation of the pipeline, the thermal stress is relatively large. b. Affected by the conveying medium, the scouring wear is relatively large. c. Affected by its own structure, the strength is weakened. Therefore, the thickness of the pipe fittings is generally larger than that of the pipe. [0003] The current pipe fitting specification contains two systems: [0004] (1), national standard [0005] GB / T12459-2005 "Steel Butt Welding Seamless Pipe Fittings" [0006] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2113/14G06F2119/06G06F30/20
Inventor 王跃祖牛卓韬高艳英杨薇国听
Owner XINDI ENERGY ENG TECH
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