CN218326801U

CN218326801U - Steel-plastic composite lining elbow

Info

Publication number: CN218326801U
Application number: CN202222976085.XU
Authority: CN
Inventors: 杨海孟; 赵洪运; 刘莹莹; 赵佩
Original assignee: Shandong Hongguangyuan Installation Engineering Co ltd
Current assignee: Shandong Hongguangyuan Installation Engineering Co ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-01-17
Anticipated expiration: 2032-11-09

Abstract

The utility model relates to the technical field of pipeline structures, in particular to a steel-plastic composite lining elbow, which comprises a steel pipe elbow and a HDPE pipe, wherein the HDPE pipe extends into the steel pipe elbow through a diameter reducer and a tractor and is used for forming the steel-plastic composite pipe elbow; the utility model forms a 'pipe-in-pipe' composite elbow structure, so that the oil field conveying pipeline is repaired in a lining pipe mode and then is hermetically connected with the original pipeline or the pipeline accessory through the elbow structure; the sealing flange and the limiting ring form a sealing connection structure of the steel-plastic composite pipe elbow, the pipe wall thickness of a connection part is increased, the interfaces are completely and accurately butted, multi-layer sealing is performed, and the sealing effect is good.

Description

Steel-plastic composite lining elbow

Technical Field

The utility model relates to a pipeline structure technical field, concretely relates to compound inside lining elbow is moulded to steel.

Background

In oil field production, the medium for pipeline transportation mainly comprises oil, water and gas, the transportation medium has high pressure and strong corrosivity, and a large amount of corrosion, perforation, damage and other phenomena commonly exist after years of operation, so that normal production of the oil field is influenced, and great potential safety and environmental protection hazards exist. Aiming at the difficult problems of frequent perforation, large maintenance difficulty, high cost for replacing a new pipeline, long construction period, large and complex construction difficulty caused by the relation between industry and agriculture and the like of an old pipeline, the trenchless pipeline lining repair technology is innovatively developed, HDPE pipes are added in the pipeline to be repaired to form lining pipes, and remarkable effect and economic benefit are obtained in the application of the oil field. However, when the lining pipe is connected with an original pipeline or when pipe fittings such as a valve and the like are installed on the lining pipe, the lining pipe needs to be bridged through an elbow under the condition of size difference, and the situation that the pipe orifice is easy to be dislocated when the lining pipe is connected with an external pipeline due to the increase of the thickness of the lining pipe causes leakage. Therefore, the steel-plastic composite lining elbow is urgently needed to be designed so as to solve the problem that the joint of the existing oilfield conveying pipeline is not tightly sealed after being repaired in a lining pipe mode.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model aims to provide a compound inside lining elbow is moulded to steel.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a compound inside lining elbow is moulded to steel, includes steel pipe elbow and HDPE pipe, inside the HDPE pipe stretched into the steel pipe elbow through necking machine and tractor for compound pipe elbow is moulded to formation steel, and the length of HDPE pipe is greater than the length of steel pipe elbow, and the part periphery that the HDPE pipe exposed the steel pipe elbow is equipped with sealing flange, and sealing flange's periphery is equipped with the spacing ring, is used for sealing flange and spacing ring to form the sealing connection structure who moulds compound pipe elbow.

Specifically, flanges are welded at two ends of the steel pipe elbow.

Specifically, the HDPE pipe adopts a bent pipe with the angle of more than 50 degrees, the outer diameter of the HDPE pipe is consistent with the inner diameter of the steel pipe elbow, and the HDPE pipe is compressed by a diameter reducer and then pulled into the steel pipe elbow through a tractor.

Specifically, the sealing flange is hot-melted and adhered to the outside of the HDPE pipe, the limiting ring is sleeved on the outside of the sealing flange, and the inner side of the limiting ring is welded on the flange plate.

The utility model discloses following beneficial effect has:

the utility model discloses a compound inside lining elbow is moulded to steel inserts the HDPE pipe that will be fit for the size in original steel pipe elbow, form "pipe-in-pipe" compound elbow structure, make the steel pipe elbow possess the comprehensive properties of steel pipe and HDPE pipe, this compound elbow structure utilizes the HDPE pipe to warp the characteristic that can the original physical shape of automatic recovery after the undergauge machine warp, it carries out the undergauge to the HDPE pipe with professional equipment before the inside lining installation to alternate, draw in the bushing pipe into the target pipeline with pulling equipment, withdraw certain frictional force, the inside lining pipe resumes original diameter and the outside pipe is closely laminated together, the bushing pipe external diameter slightly equals to former pipe internal diameter, bushing pipe and former pipe combination after accomplishing the lining dress are firm inseparable, bushing pipe thickness can design as required completely, realize that oil field pipeline carries out sealing connection former pipeline or pipe fittings through this elbow structure after restoreing through the inside lining pipe mode; the sealing flange and the limiting ring form a sealing connection structure of the steel-plastic composite pipe elbow, the pipe wall thickness of the joint is increased, the interfaces are completely and accurately butted, multi-layer sealing is performed, and the sealing effect is good.

Drawings

Fig. 1 is a cross-sectional view of a lined elbow of composite steel-plastic.

Fig. 2 is a perspective view of the seal connection structure at the flange.

Fig. 3 is a schematic diagram of the whole structure of the lining elbow made of steel and plastic.

In the figure: 1-steel pipe bend; 2-HDPE pipe; 3-sealing the flange; 4-a limiting ring; 5-a flange plate.

Detailed Description

The technical solution in the embodiments of the present invention will be described in further detail in the following clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-3, the steel-plastic composite lining elbow comprises a steel pipe elbow 1, an HDPE pipe 2, a sealing flange 3 and a limiting ring 4, wherein the HDPE pipe 2 extends into the steel pipe elbow 1 through a diameter reducing machine and a traction machine to form the steel-plastic composite pipe elbow. The two ends of the steel pipe elbow 1 are welded with flange plates 5.

The length of HDPE pipe 2 is greater than the length of steel pipe elbow 1, and the partial periphery that HDPE pipe 2 exposes steel pipe elbow 1 is equipped with sealing flange 3, and sealing flange 3's periphery is equipped with spacing ring 4 for sealing flange 3 and spacing ring 4 form the sealing connection structure of steel-plastic composite pipe elbow. Sealing flange 3 hot melt is pasted in the periphery of HDPE pipe 2, and the outside at sealing flange 3 is overlapped to spacing ring 4, and the inboard welding of spacing ring 4 is on ring flange 5. The original pipeline or the pipeline fittings are connected in a sealing way through the elbow structure after the oilfield conveying pipeline is repaired in a lining pipe way; the sealing flange and the limiting ring form a sealing connection structure of the steel-plastic composite pipe elbow, the pipe wall thickness of a connection part is increased, the interfaces are completely and accurately butted, multi-layer sealing is performed, and the sealing effect is good.

HDPE pipe 2 adopts the return bend of more than 50 degrees, and the external diameter of HDPE pipe 2 is unanimous with the internal diameter of steel pipe elbow 1, and HDPE pipe 2 draws in steel pipe elbow 1 through the tractor after the necking machine compression. One end of the HDPE pipe 2 is provided with a tapered pipe head, the tapered pipe head is connected with a traction piece through a bolt, the traction piece is connected with a traction rope of a traction machine, and the tapered pipe head is cut off after the HDPE pipe is pulled out of the steel pipe elbow 1 by the traction machine.

The reducing machine 5 adopts a multi-roller hydraulic reducing machine, adopts an advanced multi-stage roller radial uniform compression technology, reduces 8-12% of diameter, has two to six rollers at each stage, ensures the same roundness of a compressed liner pipe, ensures that the diameter of each stage is not more than 3%, shrinks step by step, has no rapid deformation and stress concentration of the liner pipe in the diameter reducing process, has no great change of molecules and lattice structures in the diameter reducing process, ensures that the liner pipe keeps the original memory characteristics and physical, chemical and mechanical properties, and provides technical support for the liner pipe to be tightly attached to the inner wall of a main pipeline. Each roller is provided with a hydraulic driving system, so that the liner tube is pushed to move forwards while being compressed, the traction force is greatly reduced, and the liner tube is ensured to be always in an elastic state without plastic deformation in the traction process. In addition, one-time penetration distance can be increased, and segmentation is reduced. The technology of the constant-diameter compression lining pipe is that a tractor is used for inserting a diameter-reduced liner pipe into a pipeline which is processed in advance, after standing and rebounding for 24 hours, the liner pipe is slowly recovered to the original shape and is tightly attached to the inner wall of the pipeline to form the steel-plastic composite pipe, and therefore the purposes of corrosion resistance and pressure bearing are achieved.

The utility model discloses not be limited to above-mentioned embodiment, anybody should learn the structural change who makes under the teaching of the utility model, all with the utility model discloses have the same or close technical scheme, all fall into the utility model discloses an within the protection scope.

The technology, shape and construction parts which are not described in detail in the present invention are all known technology.

Claims

1. The utility model provides a compound inside lining elbow is moulded to steel, its characterized in that, includes steel pipe elbow and HDPE pipe, inside the HDPE pipe stretched into the steel pipe elbow through undergauge machine and tractor for compound pipe elbow is moulded to formation steel, and the length of HDPE pipe is greater than the length of steel pipe elbow, and the part periphery that the HDPE pipe exposes the steel pipe elbow is equipped with sealing flange, and sealing flange's periphery is equipped with the spacing ring, is used for sealing flange and spacing ring to form the sealing connection structure of compound pipe elbow is moulded to steel.

2. The steel-plastic composite lined elbow according to claim 1, wherein flanges are welded to both ends of the steel pipe elbow.

3. The steel-plastic composite lining elbow according to claim 1, wherein the HDPE pipe is a bent pipe with an angle of more than 50 degrees, the outer diameter of the HDPE pipe is consistent with the inner diameter of the steel pipe elbow, and the HDPE pipe is compressed by a diameter reducer and then pulled into the steel pipe elbow by a tractor.

4. The steel-plastic composite lining elbow according to claim 1, wherein the sealing flange is hot-melt adhered to the outside of the HDPE pipe, the limiting ring is sleeved on the outside of the sealing flange, and the inner side of the limiting ring is welded on the flange.