Experimental device and method for liquid phase pipeline leaking irregular holes equivalent to round holes

Abstract

The invention relates to an experimental device and an experimental method for calculating the equivalent circular hole of an irregular leak hole in a liquid phase pipeline, which can study the characteristics of the steady state and dynamic leakage of the regular hole and the irregular hole in the liquid phase pipeline under various leakage conditions. Simulate the real leakage process of overhead, buried and underwater, calculate the equivalent circular hole area and area coefficient of irregular holes, realize the real-time, accurate and fast measurement of leakage rate, and obtain the pressure, flow and other parameters accompanying the leakage process Evolution law, used for fast calculation of leakage rate, prediction and evaluation of leakage influence range, etc. Therefore, the present invention can be used to carry out similar experiments in multiple different leakage conditions indoors, which is conducive to the accurate prediction of the pipeline leakage rate and the scope of influence of leakage diffusion, and provides a basis for the daily safety maintenance of long-distance pipelines and the emergency rescue and management of leakage accidents. Accident investigation provides a theoretical basis.

Description

technical field [0001] The invention relates to the fields of petroleum and chemical safety engineering, in particular to an experimental device and an experimental method for calculating the equivalent circular hole of an irregular leak hole in a liquid phase pipeline. Background technique [0002] Pipeline transportation has the advantages of low cost, stable supply and high safety, and has been widely used in the petrochemical industry. Because some pipelines have been put into service for a long time, the pipe walls are subject to corrosion, erosion, high pressure, and third-party damage, etc. Accidents such as pipeline rupture or perforation occur from time to time. In addition, oil and gas are flammable, explosive and other dangerous characteristics. Once leaked, it is very easy to cause vicious events such as fire and explosion, which poses a great threat to public safety. [0003] At present, the research on the characteristics and laws of pipeline leakage is mainly...

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Problems solved by technology

In addition, oil and gas are flammable, explosive and other dangerous characteristics. Once a leak occurs, it is very easy to cause vicious events such as fire and explosion, which poses a great threat to public safety.

[0003] At present, the research on the characteristics and laws of pipeline leakage is mainly based on the theoretical derivation of the basic equations of fluid mechanics, and the prediction of pipeline leakage rate and leakage influence range is carried out. In terms of leakage holes, only regular leakage holes (such as round holes) are often considered. The influence of the irregular crack shape on the leakage rate is not considered, which is out of touch with the actual site, and the prediction accuracy is low

However, there is a lack of relevant reports on simulating the steady-state and dynamic leakage processes of pipelines under different leakage conditions, calculating the leakage rate of irregular holes, and predicting the scope of leakage diffusion through large-scale similar experiments in the laboratory.

Most of the long-distance pipelines leak from irregular holes. At this stage, relevant research is extremely scarce, and it is difficult to calculate the leakage rate and evaluate the diffusion range of flammable and explosive materials. Therefore, it is necessary to construct an experimental device for calculating the equivalent of circular holes from irregular holes in liquid phase pipelines. , it is particularly important to study the characteristics and laws of irregular hole leakage

[0004] China Invention Patent Application No. 201110302314.3 discloses an underwater gas pipeline leakage detection experimental platform, which can be used to simulate the underwater environment when detecting underwater pipeline leakage, but the platform simulates the leakage conditions of pipelines with different leakage apertures by adjusting the opening of the needle valve , the shape and size of the leak cannot be accurately controlled, and the conveying medium is only gas phase material

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