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Method for calculating thickness of B-type sleeve for repairing circumferential weld crack defects of oil and gas pipeline

A technology for oil and gas pipelines and defect repair, applied in the directions of calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of difficult to guarantee welding quality, easy to produce welding defects, large welding workload, etc. The effect of reducing the probability of welding defects and ensuring the safety of pipeline service

Pending Publication Date: 2021-02-23
BC P INC CHINA NAT PETROLEUM CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The in-service welding has caused huge pressure, not only the welding workload is huge, but also the welding quality is difficult to guarantee, and welding defects are prone to occur, and the sleeve acts on the pipeline as a local concentrated load, which will have an unknown impact on the long-term service of the pipeline

Method used

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  • Method for calculating thickness of B-type sleeve for repairing circumferential weld crack defects of oil and gas pipeline
  • Method for calculating thickness of B-type sleeve for repairing circumferential weld crack defects of oil and gas pipeline
  • Method for calculating thickness of B-type sleeve for repairing circumferential weld crack defects of oil and gas pipeline

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Effect test

Embodiment

[0070] Taking the second line of the West-East Gas Pipeline Pipeline as an example, the specification is D1219×18.4mm, X80 steel grade pipeline girth weld crack defect repair, the design pressure of the pipeline is 10MPa, and the most widely used Q345R material B-type sleeve is used for repair.

[0071] Calculation method of the present invention, the steps are as follows:

[0072] (1) Obtain the pipeline to be repaired, girth weld information and girth weld crack defect detection information;

[0073] Outer diameter of the pipe to be repaired D O 1219mm, wall thickness T p It is 18.4mm, the pipe material is X80, and the material density is 7.8g / cm 3 , elastic modulus 210000MPa, Poisson's ratio 0.3, yield strength σ s 555MPa, tensile strength σ b is 625MPa, elongation is 0.2, Charpy impact energy CVN is 60J; the girth weld is equal to the pipeline; the girth weld defect is a circumferential crack on the inner surface, and the crack depth a is 9.2mm (T p / 2), the length 2c...

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Abstract

The invention discloses a method for calculating the thickness of a B-type sleeve for repairing circumferential weld crack defects of an oil and gas pipeline, and belongs to the field of oil and gas conveying pipelines. According to the method for calculating the thickness of the B-type sleeve for repairing the circumferential weld crack defect of the oil and gas pipeline, on one hand, whether thecrack defect cracks or not under the current service condition can be determined through calculation of the crack tip stress field intensity factor, and the service safety of the pipeline is guaranteed; and the thickness of the B-type sleeve is effectively reduced on the premise of ensuring the service safety of the pipeline, so that the field welding workload and the probability of welding defects are reduced.

Description

technical field [0001] The invention belongs to the field of oil and gas transmission pipelines, in particular to a method for calculating the thickness of a B-type sleeve used for repairing crack defects in girth welds of oil and gas pipelines. Background technique [0002] Type B sleeve is a permanent repair method for oil and gas pipeline pipe body and girth weld defects recognized by all current standards. see figure 1 , the B-type sleeve 2 is composed of two semi-circular tubes through welding, in which the two longitudinal welds 3 are usually welded together through a single V-shaped groove, and the two ends are welded to the main pipe 1 to be repaired through fillet welds 4 together. Compared with another recognized permanent repair method—pipe replacement, the B-type sleeve can be welded under pressure in service without venting, which greatly reduces the impact on the operation of the pipe network. The advantages of operating time and maintenance and repair costs ...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/18G06F111/10G06F113/14G06F119/14
CPCG06F30/23G06F30/18G06F2111/10G06F2113/14G06F2119/14
Inventor 白强赵新伟李锴孙宝龙侯浩王明波占传熙鲁青龙杨锋平王高峰张鸿博
Owner BC P INC CHINA NAT PETROLEUM CORP
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