Internal coating continuous pipe with cooling trough flange and its connection method

A cooling tank and flange technology, applied in flange connections, non-detachable pipe connections, coatings, etc., can solve the problems of preferential corrosion, lack of effective equipment and methods for post-weld internal repair, leakage and shutdown, etc. The effect of ensuring integrity, avoiding damage, and good corrosion resistance

Inactive Publication Date: 2008-09-24
BEIJING SAFETECH PIPELINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the weld seam and the area around the weld seam where the anti-corrosion layer is damaged is not repaired, it will often be preferentially corrode

Method used

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  • Internal coating continuous pipe with cooling trough flange and its connection method
  • Internal coating continuous pipe with cooling trough flange and its connection method
  • Internal coating continuous pipe with cooling trough flange and its connection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Material preparation

[0057] (1) Select two sections of seamless steel pipe with a specification of Φ133×5 as the main pipe, and the surface of the butt joint of the two main pipes is processed into a bevel.

[0058] (2) if figure 2 As shown, make two identical butt weld neck flanges, the inner diameter of the flange is 123mm, the outer diameter is 250mm, and the flange thickness is 50mm. A bevel 5 is provided on the outer edge of the flange sealing surface 8 . The length of the neck pipe 7 of the flange is 100mm, the wall thickness of the neck pipe of the flange is 5mm, and the end of the neck pipe is provided with a bevel. The flange sealing surface 8 is planar. An annular cooling groove 4 is opened on the flange sealing surface 8, and its cross-sectional shape is semicircular. The cooling groove is 12mm wide and 6mm deep. The diameter of the cooling hole 9 connecting the cooling groove 4 and the flange back 6 is 4 mm. Weld a cooling pipe 10 with a length o...

Embodiment 2

[0077] see Figure 5 , This embodiment uses the flange of the present invention whose sealing surface is a concave-convex surface, and other parameters and operations are the same as in Embodiment 1. The advantage of this solution is that the main tube sealing ability is improved.

Embodiment 3

[0079] see Figure 6 , This embodiment uses the flange of the present invention whose sealing surface is a tongue-and-groove surface, and other parameters and operations are the same as in Embodiment 1. The advantage of this scheme is that the quality of the flange joint structure assembly is improved, and the sealing ability of the main pipe is improved.

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Abstract

The invention relates to a flange. A cooling slot (4) is mounted on the sealed surface (8) of the flange; at least one cooling hole (9) is mounted on the back side (6) of the flange; the cooling hole (9) penetrates through the flange and communicates with the cooling slot (4). The flange of the invention suits for the corrosion resistance prevention at various metal pipeline joints which contain the corrosive media. The invention also relates to the pipeline which is provided with the flange of the invention and the connection method. The connection method for the pipeline of the invention is capable of avoiding the destruction of the heat input for the corrosion resistance layer inside the pipeline during welding, so that the integrity of the corrosion resistance layer inside the pipeline is ensured and the whole pipeline is guaranteed with good anti-corrosion performance.

Description

technical field [0001] The invention relates to a flange, in particular to a flange which is convenient for cooling during welding, a pipeline with the flange and a connection method for the pipeline. Background technique [0002] Metal pipes are widely used due to their good mechanical properties and mature manufacturing processes. However, the corrosion problem of metal pipelines, especially the corrosion of pipeline connections, has not been effectively solved. The method of butt welding is often used in the construction of steel pipelines. The pipe joints connected by this method have good performance, low cost, easy operation and good sealing performance. However, the joint welding temperature is as high as over 1,000 degrees, and the inner anti-corrosion layer of the pipe around the welded joint is usually destroyed, and the weld joint becomes a bare pipe. The entire pipe with the inner anti-corrosion layer often forms a large cathode and a small anode , to accelera...

Claims

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Application Information

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IPC IPC(8): F16L13/02F16L58/02
CPCF16L13/0263B23K2201/10F16L23/00F16L23/026F16L23/125F16L2201/44B23K2101/10
Inventor 刘国侯世颖王金友王修云路民旭
Owner BEIJING SAFETECH PIPELINE
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