An annular pipe for remedying leaks in welds

Abstract

The utility model relates to pipeline maintenance device technical field, concretely relates to an annular pipeline of rectification weld leak, including operation pipeline, the outside of operation pipeline is equipped with sealing assembly, including sealing upper half ring and sealing lower half ring in sealing assembly, the joint of sealing upper half ring and sealing lower half ring is fixed with steel band outside welding, the bottom of sealing lower half ring is connected with flange plate fixedly, sealing upper half ring and sealing lower half ring are all hollow half ring structure, and both are wound with packing structure at the joint, lead to the situation of increasing leakage, unable to repair must stop production empty, cause certain influence to production stability, under the condition of unable to stop production and replace, when the weld and thermal reaction zone leak, do not change the existing thermal reaction zone property, do not aggravate the leakage degree, the on-line maintenance pipeline of leaking, restore its use precision, the device has good popularization value because of simple operation, low investment, good effect in the pipeline maintenance process in chemical industry.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline repair devices, specifically to a ring-shaped pipeline for treating weld leaks. Background Technology

[0002] During pipe welding, as weld metal forms at the butt joint, a heat reaction zone with a width of approximately 1–3 mm is formed on both sides of the weld metal due to localized heating. Within the heat reaction zone, the internal crystal lattice of the metallic elements rearranges under the influence of localized high temperatures, reducing the corrosion resistance, toughness, and weldability of that area.

[0003] During pipeline operation, the operating medium can cause electrochemical corrosion to the pipeline base material. Due to lattice changes in the thermal reaction zone, corrosion resistance and toughness decrease. Corrosion first causes thinning of the base material in the thermal reaction zone, and the decrease in toughness leads to brittle fracture and cracking.

[0004] If the heat reaction zone or the surrounding base material is further welded or a reinforcing plate is directly welded, the extension of cracks in the base material will be aggravated due to the thinning of the base material and the decrease in weldability, leading to a worsening of the leakage. Utility Model Content

[0005] Technical problems to be solved

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a ring pipe for treating weld leakage, which can effectively solve the problems in the existing technology.

[0007] Technical solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] This utility model provides an annular pipe for treating weld leakage, including a running pipe, a sealing assembly is sleeved on the outside of the running pipe, the sealing assembly includes an upper sealing ring and a lower sealing ring, a steel strip is welded and fixed to the outside of the joint of the upper sealing ring and the lower sealing ring, and the bottom end of the lower sealing ring is connected and fixed to a flange.

[0010] Furthermore, both the upper and lower sealing rings are hollow semi-circular ring structures, and both are wrapped with packing at the joint.

[0011] Furthermore, the steel strip consists of a two-fan-shaped plate structure and an arc-shaped plate structure that fixes the two sets of fan-shaped plates.

[0012] Furthermore, the outer side of the flange is in communication with the ball valve, and the top of the flange is in communication with the interior of the lower sealing ring via a seamless pipe.

[0013] Furthermore, the inner side of the steel strip covers the circumferential weld and the leaking portion of the thermal reaction zone of the operating pipeline.

[0014] Beneficial effects

[0015] The technical solution provided by this utility model has the following advantages compared with the known public technology:

[0016] In this invention, traditional online pipeline repair methods typically involve direct welding or welding reinforcing plates. This can lead to changes in the properties of the thermal reaction zone due to heat, resulting in increased leakage and necessitating production shutdown and venting, thus impacting production stability. In situations where production shutdown and replacement are not feasible, this innovative method addresses leaks in the weld seams and thermal reaction zone without altering the existing properties of the thermal reaction zone or exacerbating the leakage. This allows for online repair of leaking pipelines, restoring their operational accuracy. This device is highly valuable for application in pipeline repair within the chemical industry due to its simple operation, low investment, and high effectiveness. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an exploded view of the structure of this utility model;

[0020] Figure 3 This is one of the exploded structural diagrams of the sealing component in this utility model;

[0021] Figure 4 This is the second exploded view of the sealing component in this utility model.

[0022] The labels in the diagram represent: 1. Operating pipeline; 2. Sealing assembly; 21. Upper sealing ring; 22. Lower sealing ring; 23. Flange; 24. Seamless pipe; 3. Steel strip. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] The present invention will be further described below with reference to the embodiments.

[0025] Example: A ring-shaped pipe for treating weld leaks, see attached diagram. Figure 1 - Appendix Figure 4 The system includes an operating pipeline 1, and a sealing assembly 2 is fitted on the outside of the operating pipeline 1. The sealing assembly 2 includes an upper sealing ring 21 and a lower sealing ring 22. A steel strip 3 is welded and fixed to the outside of the joint between the upper sealing ring 21 and the lower sealing ring 22. The bottom end of the lower sealing ring 22 is connected and fixed to a flange 23.

[0026] Both the upper sealing ring 21 and the lower sealing ring 22 are hollow semi-circular ring structures, and both are wrapped with packing at the joint. The upper part of the sealing device is fabricated as an arc-shaped cavity. The radius of the middle cavity is determined based on the installation space, the diameter of the operating pipeline, and the leakage rate, and is generally more than 150mm larger than the operating pipeline. The diameters of the two side cavities are 10-15mm larger than the operating pipeline. The lower part of the sealing device is then fabricated. The external dimensions of the lower part of the sealing device are the same as those of the upper part.

[0027] The steel strip 3 consists of two fan-shaped plates and an arc-shaped plate structure that fixes the two sets of fan-shaped plates. The outer side of the flange 23 is connected to the ball valve, and the top of the flange 23 is connected to the inside of the lower sealing ring 22 through a seamless pipe 24. A 100mm long seamless pipe is welded to the lower half of the sealing device, and a flange ball valve is installed. The number of seamless pipes and ball valves is determined according to the leakage amount. If the leakage amount is large, the number of seamless pipes and ball valves can be increased appropriately. The inner side of the steel strip 3 covers the annular weld and the leakage part of the heat reaction zone of the operating pipeline 1. Before surrounding, the ball valve of the lower half of the sealing device is opened. The medium in the pipeline leaks out from the leak point, sprays onto the inner wall of the middle cavity, and is discharged through the ball valve. The upper and lower parts of the sealing device completely surround the annular weld and the leakage part of the heat reaction zone of the pipeline. The weld and the heat reaction zone are located in the middle cavity.

[0028] During installation, care should be taken not to impact the operating pipeline, and the weight of the sealing device should not be applied to the operating pipeline to avoid increased leakage points and cracks due to decreased toughness of the thermal reaction zone after the pipeline is stressed; use packing to completely fill the gaps between the upper and lower parts of the device and the operating pipeline until there is no liquid leakage; completely weld the gaps between the upper and lower parts of the device and the operating pipeline; close the ball valve of the lower part of the device.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A ring-shaped pipe for treating weld leaks, characterized in that, The system includes an operating pipe (1), and a sealing assembly (2) is fitted on the outside of the operating pipe (1). The sealing assembly (2) includes an upper sealing ring (21) and a lower sealing ring (22). A steel strip (3) is welded and fixed to the outside of the joint between the upper sealing ring (21) and the lower sealing ring (22). The bottom end of the lower sealing ring (22) is connected and fixed to a flange (23).

2. The annular pipe for treating weld leakage according to claim 1, characterized in that, The upper sealing ring (21) and the lower sealing ring (22) are both hollow semi-circular ring structures, and both are wrapped with packing at the joint.

3. The annular pipe for treating weld leakage according to claim 1, characterized in that, The steel strip (3) consists of two fan-shaped plates and an arc-shaped plate structure that fixes the two sets of fan-shaped plates.

4. The annular pipe for treating weld leakage according to claim 1, characterized in that, The outer side of the flange (23) is in communication with the ball valve, and the top of the flange (23) is in communication with the interior of the sealing lower half ring (22) through a seamless pipe (24).

5. A ring-shaped pipe for treating weld leakage according to claim 4, characterized in that, The inner side of the steel strip (3) covers the circumferential weld and the leaking part of the thermal reaction zone of the operating pipeline (1).

Images