阅读说明：本技术 一种内衬不锈钢复合钢管及制备方法 (Stainless steel lined composite steel pipe and preparation method thereof ) 是由 郑明� 罗佳 于 2020-07-10 设计创作，主要内容包括：本发明公开了一种内衬不锈钢复合钢管,包括钢管基体、不锈钢板内衬和不锈钢封板,钢管基体两端开口处分别焊接有平面法兰,平面法兰的平面上内嵌焊接有不锈钢弧度板；在不锈钢板内衬上设有多个钻孔,设置于钢管基体内侧管壁上,其靠近平面法兰一端与平面法兰上的不锈钢弧度板焊接；不锈钢封板封闭于不锈钢板内衬上的钻孔上,通过不锈钢封板将不锈钢板内衬焊接在所述钢管基体上。本发明还提供一种内衬不锈钢复合钢管的制备方法。本方案通过将大直径衬胶管改为内衬不锈钢板,可以提高管道的可靠性,降低运维成本,有效延长了管道的使用寿命。(The invention discloses a stainless steel lined composite steel pipe, which comprises a steel pipe matrix, a stainless steel plate lining and a stainless steel sealing plate, wherein plane flanges are respectively welded at openings at two ends of the steel pipe matrix, and stainless steel radian plates are embedded and welded on the plane of the plane flanges; a plurality of drill holes are arranged on the inner liner of the stainless steel plate, the drill holes are arranged on the pipe wall at the inner side of the steel pipe matrix, and one end of the drill holes, which is close to the planar flange, is welded with the stainless steel radian plate on the planar flange; and the stainless steel seal plate is sealed on the drilled hole on the stainless steel plate lining, and the stainless steel plate lining is welded on the steel pipe base body through the stainless steel seal plate. The invention also provides a preparation method of the stainless steel lined composite steel pipe. This scheme is through changing major diameter lining rubber tube into inside lining stainless steel board, can improve the reliability of pipeline, reduces fortune dimension cost, has effectively prolonged the life of pipeline.)

1. A stainless steel lined composite steel pipe is characterized by comprising a steel pipe base body, a stainless steel plate lining and a stainless steel sealing plate, wherein planar flanges are welded at openings at two ends of the steel pipe base body respectively, and stainless steel radian plates are welded on the planes of the planar flanges in an embedded mode; the stainless steel plate lining is provided with a plurality of drill holes, is arranged on the pipe wall at the inner side of the steel pipe matrix, and one end of the stainless steel plate lining, which is close to the planar flange, is welded with the stainless steel radian plate on the planar flange; the stainless steel seal plate is sealed on the drill hole on the stainless steel plate lining, and the stainless steel plate lining is welded on the steel pipe base body through the stainless steel seal plate.

2. The lined stainless steel composite steel pipe of claim 1, wherein the diameter of the drill holes in the stainless steel plate lining is 20-30 mm, and the edge distance between every two adjacent drill holes is 20 cm.

3. The lined stainless steel composite steel pipe as claimed in claim 1, wherein the stainless steel radian plate has a thickness of 2mm to 5mm and a width of 35mm to 45 mm.

4. The lined stainless steel composite steel pipe as claimed in claim 3, wherein the number of embedded welding interfaces between the stainless steel radian plate and the plane of the planar flange is 6, and the embedded welding interfaces are uniformly distributed on the plane of the planar flange.

5. The preparation method of the stainless steel lined composite steel pipe is characterized by comprising the following steps: s1, processing a plane flange, cutting a welding plane with the same width and thickness as the stainless steel radian plate on the inner side plane of the plane flange, distributing 6 embedded welding interfaces on the welding plane, welding the stainless steel radian plate on the welding plane of the plane flange, and polishing a welding seam;

s2, manufacturing a stainless steel plate lining, namely selecting a stainless steel plate of which the length is slightly smaller than the perimeter of the inner wall of the steel pipe substrate, drilling holes with the diameter of 20-30 mm on the stainless steel plate, keeping the edge distance between every two adjacent holes at 20cm, and manufacturing the stainless steel plate lining according to the radian circle of the steel pipe substrate;

and S3, welding the composite steel pipe, namely placing the stainless steel plate lining into the steel pipe base to be tightly attached to the pipe wall of the steel pipe base, arranging a stainless steel sealing plate sealing hole on each drilling hole, welding the stainless steel sealing plate, the stainless steel plate lining and the steel pipe base together by argon arc welding, and simultaneously welding the stainless steel plate lining and the embedded stainless steel radian plate on the planar flange to form the lined stainless steel composite steel pipe.

6. The method for preparing the stainless steel lined composite steel pipe according to claim 5, further comprising a bypass pipe welding step, which specifically comprises the following substeps:

s401, selecting a stainless steel plate with the same radian as the inner wall of the steel pipe base body, and cutting a hole with the same diameter as the bypass pipe at the center of the stainless steel plate;

s402, cutting an opening on the steel pipe base body, inserting the bypass pipe into the steel pipe base body from the opening, and welding the bypass pipe on the steel pipe base body along the edge of the opening of the steel pipe base body;

and S403, sleeving the stainless steel plate with the cut opening on the by-pass pipe, attaching the stainless steel plate to the inner wall of the steel pipe base body for welding, and then welding the stainless steel plate and the by-pass pipe.

Technical Field

The invention relates to the field of pipes, in particular to a stainless steel lined composite steel pipe and a preparation method thereof.

Background

At present, high-capacity conveying pipes of power station desulfurization and chemical enterprises adopt rubber-lined pipelines to convey corrosive media, wherein part of media still have abrasiveness, the lining rubbers are aged in service period, the pipelines need to return to professional rubber-lined enterprises to line rubber again after being put into operation for 3-5 years each time, and the fallen rubber-lined rubber often blocks the pipelines, valves, pump inlets and the like, so that the sudden abnormality of the operation of environmental protection equipment is easily caused. The large-diameter rubber-lined pipes generally belong to pipelines on important equipment, once leakage occurs, effective treatment is difficult, and after rubber lining falls off, the rubber-lined pipes lack the rubber lining protection part and are corroded and perforated by slurry, so that leakage occurs. The defects can not be repaired, otherwise, high temperature is generated by welding, more lining rubber is damaged, and the lining rubber in a larger area falls off. Therefore, the defects can only be realized by adopting temporary plugging measures, the pipeline is disassembled after the machine is stopped, the lining rubber can be firmly bonded with the iron pipe wall because the lining rubber needs to be vulcanized at high temperature, the pipeline lining rubber cannot be recovered after field treatment, the pipeline lining rubber can only be returned to a factory and then is re-lined, and a large amount of manpower and material resources are consumed. When the corrosion is serious, the operation of the main equipment is even affected.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a lined stainless steel composite steel pipe and a preparation method thereof.

The purpose of the invention is realized by the following technical scheme:

a stainless steel lined composite steel pipe comprises a steel pipe base body, a stainless steel plate lining and stainless steel sealing plates, wherein planar flanges are welded at openings at two ends of the steel pipe base body respectively, and stainless steel radian plates are embedded and welded in the planes of the planar flanges; the stainless steel plate lining is provided with a plurality of drill holes, is arranged on the pipe wall at the inner side of the steel pipe matrix, and one end of the stainless steel plate lining, which is close to the plane flange, is welded with the stainless steel radian plate on the plane flange; the stainless steel seal plate is sealed on the drill hole on the stainless steel plate lining, and the stainless steel plate lining is welded on the steel pipe base body through the stainless steel seal plate.

Optionally, the diameter of the drill hole in the stainless steel plate lining is 20 mm-30 mm, and the edge distance between every two adjacent drill holes is 20 cm.

Optionally, the thickness of the stainless steel radian plate is 2 mm-5 mm, and the width is 35 mm-45 mm.

Optionally, there are 6 embedded welding interfaces between the stainless steel arc plate and the plane of the planar flange, and the embedded welding interfaces are uniformly distributed on the plane of the planar flange.

A preparation method of a stainless steel lined composite steel pipe comprises the following steps:

s1, processing a plane flange, cutting a welding plane with the same width and thickness as the stainless steel radian plate on the inner side plane of the plane flange, distributing 6 embedded welding interfaces on the welding plane, welding the stainless steel radian plate on the welding plane of the plane flange, and polishing a welding seam;

s2, manufacturing a stainless steel plate lining, namely selecting a stainless steel plate of which the length is slightly smaller than the perimeter of the inner wall of the steel pipe substrate, drilling holes with the diameter of 20-30 mm on the stainless steel plate, keeping the edge distance between every two adjacent holes at 20cm, and manufacturing the stainless steel plate lining according to the radian circle of the steel pipe substrate;

and S3, welding the composite steel pipe, namely placing the stainless steel plate lining into the steel pipe base to be tightly attached to the pipe wall of the steel pipe base, arranging a stainless steel sealing plate sealing hole on each drilling hole, welding the stainless steel sealing plate, the stainless steel plate lining and the steel pipe base together by argon arc welding, and simultaneously welding the stainless steel plate lining and the embedded stainless steel radian plate on the planar flange to form the lined stainless steel composite steel pipe.

Specifically, the method further comprises a bypass pipe welding step, which specifically comprises the following sub-steps:

s401, selecting a stainless steel plate with the same radian as the inner wall of the steel pipe base body, and cutting a hole with the same diameter as the bypass pipe at the center of the stainless steel plate;

s402, cutting an opening on the steel pipe base body, inserting the bypass pipe into the steel pipe base body from the opening, and welding the bypass pipe on the steel pipe base body along the edge of the opening of the steel pipe base body;

and S403, sleeving the stainless steel plate with the cut opening on the by-pass pipe, attaching the stainless steel plate to the inner wall of the steel pipe base body for welding, and then welding the stainless steel plate and the by-pass pipe.

The invention has the beneficial effects that: the manufacturing cost of the scheme is equivalent to the factory returning rubber lining cost of the rubber lining pipe, the service life of the rubber lining pipe is longer than that of the rubber lining pipe, the equipment operation reliability can be effectively improved, the equipment operation cost is low, and a large amount of manpower and material resources can be saved in the later production process.

Drawings

Fig. 1 is a sectional view of a composite steel pipe of the present invention.

Fig. 2 is a partial structural view of a planar flange of the present invention.

FIG. 3 is a view showing the structure of the stainless steel plate liner of the present invention.

FIG. 4 is a flow chart of a manufacturing process of the present invention.

FIG. 5 is a schematic view of a partial weld of the stainless steel panel liner of the present invention.

FIG. 6 is a schematic view of the welding of the bypass pipe of the present invention.

Description of reference numerals: the method comprises the following steps of 1-steel pipe base body, 2-plane flange, 3-stainless steel plate lining, 4-drilling, 5-stainless steel sealing plate, 6-stainless steel radian plate and 7-bypass pipe.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

In the embodiment of the invention, as shown in fig. 1, a stainless steel lined composite steel pipe comprises a steel pipe base body 1, a stainless steel plate lining 3 and a stainless steel sealing plate 5, wherein the openings at two ends of the steel pipe base body 1 are respectively welded with a planar flange 2, and a stainless steel radian plate 6 is embedded and welded on the plane of the planar flange 2; the stainless steel plate lining 3 is provided with a plurality of drill holes 4, is arranged on the pipe wall at the inner side of the steel pipe matrix 1, and one end of the stainless steel plate lining close to the plane flange 2 is welded with the stainless steel radian plate 6 on the plane flange 2; the stainless steel closing plate 5 is sealed on the drilling hole 4 on the stainless steel plate lining 3, and the stainless steel plate lining 3 is welded on the steel pipe base body 1 through the stainless steel closing plate 5.

Optionally, the diameter of the drill hole in the stainless steel plate lining can be set to be 20 mm-30 mm, as shown in fig. 3, in the embodiment, the diameter of the drill hole 4 in the stainless steel plate lining 3 is set to be 25mm, and the edge distance between every two adjacent drill holes 4 is 20 cm.

Optionally, the thickness of the stainless steel radian plate can be set between 2mm and 5mm, and the width can be set between 35mm and 45 mm. As shown in fig. 2, the embodiment sets the thickness of the stainless steel arc plate 6 to 3mm and the width to 40 mm. Correspondingly, the plane of the plane flange 2 is provided with a welding plane with the same thickness and width as the stainless steel radian plate 6, the welding plane is provided with embedded welding interfaces, the number of the embedded welding interfaces is at least 6, the stainless steel radian plate 6 is uniformly distributed on the welding plane of the plane flange 2, and the embedded welding interfaces are welded on the plane flange 2.

As shown in fig. 4, a preparation method of a stainless steel lined composite steel pipe comprises the following steps:

step 1, processing a planar flange 2, cutting a welding plane with the same width and thickness as the stainless steel radian plate on the inner side plane of the planar flange 2, meanwhile, distributing and arranging 6 embedded welding interfaces on the welding plane, welding the stainless steel radian plate 6 on the welding plane of the planar flange 2, and polishing a welding seam.

And 2, manufacturing a stainless steel plate lining 3, selecting a stainless steel plate with the length slightly smaller than the perimeter of the inner wall of the steel pipe base body 1, drilling holes 4 with the diameter of 20 mm-30 mm on the stainless steel plate, keeping the edge distance between every two adjacent holes 4 at 20cm, and manufacturing the stainless steel plate lining 3 by the stainless steel plate according to the radian circle of the steel pipe base body 1.

And 3, welding the composite steel pipe, as shown in fig. 5, placing the stainless steel plate lining 3 into the steel pipe base body 1 to be tightly attached to the pipe wall of the steel pipe, arranging a stainless steel sealing plate 5 on each drilling hole 4 to seal the drilling hole 4, welding the stainless steel sealing plate 5, the stainless steel plate lining 3 and the steel pipe base body 1 together by argon arc welding, and simultaneously welding the stainless steel plate lining 3 and the embedded stainless steel radian plate 6 on the planar flange 2 to form the lined stainless steel composite steel pipe.

The preparation method of the composite steel pipe further comprises the welding of a bypass pipe 7, as shown in fig. 6, the welding process comprises the following steps: firstly, a stainless steel plate with the same radian as the inner wall of the steel pipe base body 1 is selected, and an opening with the same diameter as that of the bypass pipe 7 is cut at the center of the stainless steel plate.

Then, an opening is cut in the steel pipe base 1, the bypass pipe 7 is inserted into the steel pipe base 1 from the opening, and the bypass pipe 7 is welded to the steel pipe base 1 along the opening edge of the steel pipe base 1.

And finally, sleeving the stainless steel plate with the cut opening on the bypass pipe 7, attaching the stainless steel plate to the inner wall of the steel pipe base body 1 for welding, and then welding the stainless steel plate with the bypass pipe 7.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.