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Method for calculating wall thickness of large-aperture high-strength tee joints manufactured through hot drawing process for oil and gas delivery pipeline

A technology of transportation pipelines and calculation methods, applied to pipes, branch pipelines, pipes/pipe joints/fittings, etc., can solve problems such as increased technical difficulty, large deviation of final results, and difficult design requirements

Active Publication Date: 2014-01-29
CNPC TUBULAR GOODS RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of engineering practices have shown that: according to the tee wall thickness determined by the latter, the result is very conservative, not only the production cost is high, but also the technical difficulty is greatly increased, and the final results determined by the two methods deviate greatly, making it difficult to be better. Fully meet the design requirements of large-diameter and high-strength tees in pipeline engineering construction

Method used

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  • Method for calculating wall thickness of large-aperture high-strength tee joints manufactured through hot drawing process for oil and gas delivery pipeline
  • Method for calculating wall thickness of large-aperture high-strength tee joints manufactured through hot drawing process for oil and gas delivery pipeline
  • Method for calculating wall thickness of large-aperture high-strength tee joints manufactured through hot drawing process for oil and gas delivery pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1: The design pressure of Φ1219mm×1219mm×1219mm is 12MPa, the material is X80 tee, the wall thickness of the connecting station pipe is 30.8mm, the design pressure is 12MPa, the material is X80, and the minimum wall thickness of the tee determined by area reinforcement is 78mm. The minimum wall thickness of the tee determined by this calculation method is 48-50mm, and the verification test results of the tee connected to the steel pipe show that the ultimate bearing internal pressure of the tee is 43-46MPa.

Embodiment 2

[0074] Example 2: The design pressure of Φ1219mm×1219mm×1016mm is 12MPa, the material is X80 tee, the wall thickness of the connecting station pipe is 26.2mm, the design pressure is 12MPa, the material is X80, and the minimum wall thickness of the tee determined by area reinforcement is 64mm. The minimum wall thickness of the tee determined by this calculation method is 44mm, and the verification test results of the tee connected to the steel pipe show that the ultimate bearing internal pressure of the tee is 43.8MPa.

Embodiment 3

[0075] Example 3: The design pressure of Φ1219mm×1219mm×813mm is 12MPa, the material is X80 tee, the wall thickness of the connecting station pipe is 26.2mm, the design pressure is 12MPa, the material is X80, and the minimum wall thickness of the tee determined by area reinforcement is 52mm. The minimum wall thickness of the tee determined by this calculation method is 40mm, and the verification test results of the tee connected to the steel pipe show that the ultimate bearing internal pressure of the tee is 44.5MPa.

[0076] Table 1 Ultimate bearing pressure of steel pipes used in key pipeline projects

[0077]

[0078] Table 2 Statistical results of the blasting test results of a trial-manufactured tee in the early stage of a pipeline project

[0079]

[0080] Table 3 Statistical results of the blasting test results of trial-manufacturing tees using this calculation method

[0081]

[0082] Table 1 shows the ultimate bearing pressure of steel pipes used in key pipe...

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Abstract

The invention provides a method for calculating the wall thickness of large-aperture high-strength tee joints manufactured through the hot drawing process for an oil and gas delivery pipeline. The formulas for calculating the wall thickness of large-aperture high-strength tee joint pipes are as follows: the equal-diameter tee joint main pipe wall thickness: , and the reducer tee joint main pipe wall thickness: . The formulas for calculating the wall thickness of the large-aperture high-strength tee joint pipes meet the manufacturing requirements of all large-aperture tee joint pipes manufactured and formed through the hot drawing process of X70 and X 80 high steel levels. By the utilization of the method for calculating the wall thickness of the tee joints based on a station yard steel tube, onerous and complex tee joint area reinforcement calculation and analysis operation can be avoided, the calculating result is used for determining the minimum wall thickness of the tee joints, the equal strength connection between the steel tube and the tee joints of a pipeline system is achieved, and the requirements of petroleum and natural gas pipeline engineering construction for the high-strength large-aperture tee joints are met.

Description

technical field [0001] The invention relates to the technical field of oil and gas transportation equipment, in particular to a method for calculating the wall thickness of a hot-drawn tee for large-diameter and high-strength oil and gas transportation pipelines. Background technique [0002] In the construction of long-distance oil and gas pipeline projects, in order to meet the needs of distribution, direction change, and metering, a large number of large-diameter pipe fittings such as elbows and tees are often required for on-site construction of stations, valve rooms, and compressor stations. For tee pipe fittings, due to the unique arc transition structure of the root of the branch pipe and the main pipe, the structural strength of the tee strongly depends on the radius of curvature R of the root of the branch pipe and the main pipe and the wall thickness t of the shoulder, and the calculation and analysis of the reinforcement stress of the opening is very complicated. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L41/02
CPCF16L41/021
Inventor 刘迎来吴宏齐丽华王高峰郭志梅李云龙王长安
Owner CNPC TUBULAR GOODS RES INST