Large microcrystalline glass-lined pipeline and manufacturing method thereof

Abstract

The invention relates to a pipeline for conveying petroleum, natural gas and the like and a manufacturing method thereof, and belongs to the field of special pipelines for conveying oil and gas. The oil and gas pipeline provided by the invention has three scientific and technological innovations; two groups of strengthening annular bodies are welded on the large flanges at the two ends of the pipeline; a plurality of groups of strengthening steel bar plates and overall strengthening steel circular pipe fittings are combined and welded symmetrically, and the non-deformable mechanical strength of the overall pipeline is increased. The microcrystalline glass lining has the advantage of 8-level Mohs strength, and the highest quality index can be performed comprehensively and creatively by adjusting the formula and the ratio of the microcrystalline and amorphous glass lining enamel according to the requirements on the specific physicochemical performances of different structural parts of each oil and gas pipeline engineering and each pipeline. By applying an openable and closeable extra long horizontal electric heating furnace and an intelligent temperature control instrument, and combining a new process of rotating while heating, the extra large and extra long integrated large microcrystalline glass-lined pipeline which has high glass-lined layer quality, and is smooth in circulation, durable, non-corrosive, wear-resistant, high in seismic resistance, and safe in operation is developed. The large microcrystalline glass-lined pipeline can comprehensively replace various current pipelines by virtue of comprehensive strong advantages.

Description

technical field [0001] The invention relates to a medium conveying pipeline for oil, natural gas, chemical industry, coal particles, etc. and a manufacturing method thereof. The non-deformation of the structural parts and strong anti-seismic mechanical properties ensure that the pipeline will not corrode for a long time, flow smoothly, and operate safely. It is a long-term special pipeline for large-scale microcrystalline glass-lined oil and gas transportation. Background technique [0002] Oil and gas pipelines, referred to as oil and gas pipelines for short, are an important part of my country's national public security, occupy an extremely important strategic position in the national economy, and are known as the country's major lifeline. According to reports, there are about 10 long-distance oil and gas pipelines in my country. 5 km, the gathering pipeline is about 3×10 5 km, in recent years, China will be at the peak of pipeline construction. By the end of the "12th F...

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Problems solved by technology

[0008] The vertical heating electric furnace is not limited by the large diameter and special length of the pipe. The alignment of the pipe is guaranteed after firing, but the glass-lined glaze layer on the inner wall of the pipe is in a flowing state during firing at high temperature (850-900°C), and the upper end is thinner than the lower end. Thick, poor uniformity of glaze layer

[0009] Horizontal electric heating furnace, it is difficult to enter and exit the furnace with pipelines, because the pipeline supports the burning frame as a fire stop in the heating furnace, the overall glass-lined glaze layer is heated unevenly, resulting in poor quality of the fired glass-lined glaze layer; The pipeline has been heated for a long time at high temperature for several times, causing large deformation of the pipeline and the flange surfaces at both ends, which is directly related to the safety and economic benefits of the overall installation project, and does not meet the current national standard GB25025-2010 (equipment diameter ≥ 1000mm, maximum and minimum diameter Difference ≤ 6mm, flatness tolerance ≤ 2mm); and the diameter of the horizontal heating electric furnace must be enlarged, and the power consumption will increase; the electric furnace is easily damaged, etc.

[0010] It can be seen that the application of vertical and horizontal electric heating furnaces is extremely difficult to break through the manufacture of long pipes due to the uneven heating temperature of the long pipes. The overall glass-lined glaze layer has serious quality problems and the overall structure of the pipe and both ends Flange deformation

[0011] After more than a year of trial production, it was not suitable for long-distance pipeline transportation of coal particles, and the research of the project was terminated. There has been no development and manufacture of large-scale glass-lined pipelines for more than 20 years

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