CN211471290U - Novel composite water-blocking breathable elastic film for repairing pipeline - Google Patents

Abstract

The utility model relates to a petrochemical trade pipeline restoration field, especially a novel compound restoration pipeline ventilative elastic membrane that blocks water. A novel composite repair pipeline water-blocking breathable elastic film comprises a primer layer (1), a water-blocking breathable unidirectional film (2) and a composite fiber reinforced belt (3); the innermost layer is a bottom glue layer (1), the secondary inner layer and the outermost layer are water-blocking breathable unidirectional films (2), a secondary outer layer composite fiber reinforced belt (3) is arranged between the two water-blocking breathable unidirectional films (2), and the layers are connected through an adhesive; the waterproof and breathable one-way film (2) realizes the waterproof and breathable functions, and the composite fiber reinforced belt (3) solves the problem of insufficient strength. The utility model solves the problems of fire operation, long downtime, high danger, damage to the original pipeline and high cost of the traditional repairing method.

Description

Novel composite water-blocking breathable elastic film for repairing pipeline

Technical Field

The utility model relates to a petrochemical trade pipeline restoration field, especially a novel compound restoration pipeline ventilative elastic membrane that blocks water.

Background

Maintaining pipe integrity is a major problem facing owners and operators. As the primary path for the process fluid, the pipe is susceptible to corrosion, erosion, or mechanical damage. If these problems are not dealt with in a timely manner, environmental and safety hazards, accidents, and high costs are likely to be incurred. How to persistently reduce the probability of these events becomes a major challenge for the industry.

In the past, when repairing a damaged pipe, one has typically cut the affected pipe section and welded a new pipe section in place. This method requires downtime and involves high temperature sparking operations, and welding is required to be performed in a more controlled environment due to the explosion hazard associated with high temperature welding operations. Furthermore, welding may present metallurgical problems, such as stress cracking in localized corrosion areas at the weld site. If the strict risk management is not performed, the safety of constructors is endangered, serious environmental problems are caused, and the fundamental problems cannot be solved.

From a safety perspective:

because sparks are generated during welding, the construction area is limited, especially in an environment with potentially explosive gases. The sparks generated during the welding process may cause fire or even explosion.

In addition, toxic gases generated during welding adversely affect welders working in confined spaces and are harmful to the environment because the welding gases contain nitrogen monoxide, nitrogen dioxide, carbon monoxide and ozone.

In terms of down time:

some of the necessary steps in the welding process also take a certain amount of time. Prior to construction, the equipment needs to be degreased and cleaned, its surface needs to be re-machined to the original profile, and once construction is complete, the equipment needs to be stress relieved. Post weld heat treatment and inspection can further extend downtime.

In terms of defects and failures:

when the filler material or parent material is different, galvanic corrosion typically occurs. In addition, the heat generated by welding can lead to the generation of Heat Affected Zones (HAZ), which can also accelerate corrosion.

Residual stresses from uneven expansion and contraction alter the structure and properties of the metal and can also lead to potential material degradation.

In addition, after the pipeline which is repaired and reinforced is buried and backfilled, various factors such as physical damage, rain, snow, bad weather conditions and the like can damage the integrity of the pipeline, a large amount of accumulated water is generated on the ground surface due to the lack of a drainage structure, and further the accumulated water can permeate into a base material to cause rapid degradation of the pipeline, so that the waterproof capability of the pipeline is seriously damaged and damaged, and the degradation speed is very rapid.

Once the problem area is identified, it must be quickly addressed and protected against, as the possible continued deterioration can cause damage, and thus damage to the structural integrity of the pipeline, with serious consequences.

There are many common methods of solving the leakage problem. One such method is to replace the damaged material with the same material, similar to a repair. The surface will continue to be damaged by replacing the damaged material with the same material. While this approach may temporarily repair the leak, it does not effectively protect the surface. Furthermore, this method tends to be very expensive in view of the material replacement cost and the labor cost of installation work.

Other problems often arise with the repair of leaks using conventional repair techniques. The commonly used solution involves a fire operation and is therefore dangerous, time consuming and a destructive repair method. Of course, other repair materials may also be used, however these materials may contain hazardous solvents that have a significant health and safety impact on personnel and the construction environment and cause significant damage. In many respects, these methods do not allow for an economical, non-intrusive, long-lasting and extremely durable all-round repair.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel compound restoration pipeline ventilative elastic membrane that blocks water, aim at solve traditional restoration method and move fiery operation, down time long, dangerous high, destroy former pipeline and the problem that the expense is high.

The technical scheme adopted by the invention for solving the technical problems is as follows:

saturated oxygen corrosion is generated in areas above the ground and 50cm below the ground of a circulating water pipeline of each large petrochemical device, which possibly causes environmental and safety hazards and accidents and causes high cost. In order to avoid the occurrence of the above conditions of the equipment, the easily damaged area of the circulating water pipeline is repaired, enhanced and protected. Compared with a welding process, the water-blocking and breathable elastic membrane for the composite repair pipeline can be carried out on line in situ, fire operation is not needed, a welding scheme is replaced, and the downtime is effectively reduced.

The novel composite repair pipeline water-blocking breathable elastic film comprises a primer layer, a water-blocking breathable unidirectional film and a composite fiber reinforced belt; the innermost layer is a primer layer made of a high-molecular adhesive material and used for being directly adhered to a repair area, the secondary inner layer and the outermost layer are water-blocking and breathable one-way films, the water-blocking and breathable one-way films achieve the waterproof and breathable functions, the secondary outer layer of the composite fiber reinforcing belt is arranged between the two layers of the water-blocking and breathable one-way films, and the problem of insufficient strength is solved by the composite fiber reinforcing belt. The layers are connected by an adhesive. The novel composite repairing pipeline water-blocking breathable elastic membrane is used for repairing a corrosion area, the surface treatment needs to be carried out on a saturated oxygen corrosion area, the Belzoner construction standard is achieved, and then reinforcement is carried out in a spiral winding mode.

The waterproof breathable one-way film can effectively prevent external moisture from permeating into a pipeline from the edge to corrode, can also evaporate residual moisture inside, has better bonding force, extremely strong ageing resistance and durable performance, and can better protect the pipeline.

The water-blocking breathable one-way film further has the following advantages:

1) waterproof, weatherproof;

2) the maintenance is simplified;

3) can realize strong adhesion with various types of roof base materials;

4) complex contours can be fitted;

5) high-temperature operation is not needed, and no odor problem exists;

6) 100% of transverse elongation and 20% of longitudinal elongation;

7) can effectively resist ultraviolet radiation.

The working parameters of the novel composite repair pipeline water-blocking breathable elastic film meet the following requirements:

1) the thermal expansion coefficient is close to that of steel;

2) high Young's modulus (-38,000 MPa/5,511,440psi) and low Poisson's ratio (0.26);

3) after 1000 hours of immersion, the tensile shear adhesion was as high as 19MPa/2,748 psi.

Preferably, the repair process of the water-blocking breathable elastic membrane using the novel composite repair pipeline comprises the following steps: firstly, finding out the damaged or corroded position of a circulating water pipeline of each large petrochemical device to break soil, wherein the excavation depth is more than 0.5m, the soil breaking width is about 0.5m away from the surface of the pipeline, and carrying out surface treatment on the damaged or corroded position of the pipeline, and the rust removal grade is Sa2.5; then repairing the pitting corrosion part on the surface of the pipeline by using a high molecular metal repairing agent to restore the integrity of the equipment; then, the novel composite restoration pipeline water-blocking breathable elastic film is used for carrying out anticorrosion reinforcement on the pipeline, the novel composite restoration pipeline water-blocking breathable elastic film is used for sealing the front and back of a damaged or corroded position by 0.3m respectively, and the construction requires that the surface temperature of the pipeline is not lower than 15 ℃; and finally, backfilling the ground to restore the original state.

The utility model has the advantages of: the novel composite repair pipeline water-blocking breathable elastic membrane repair pipeline can be quickly and simply constructed on site without special equipment; no health potential safety hazard exists; on-site machining, stress relief and postweld heat treatment are not required; can be used for irregular shapes and base materials, including elbows, three-way pipes, complex geometric shape pipelines and filling gaps on the surface; can ensure 100 percent of surface contact degree and improve the bearing capacity; particularly for use in above-ground and below-ground pipelines; resistance to chemical attack by various chemicals, oils and process fluids; the firing operation is not needed; solves the problems of fire operation, long downtime, high danger, damage to the original pipeline and high cost of the traditional repair method.

Drawings

FIG. 1 is a schematic structural view of a water-blocking and breathable elastic membrane for a novel composite repair pipeline;

FIG. 2 is a schematic diagram of a water-blocking and air-permeable elastic membrane for a novel composite repair pipeline;

FIG. 3 is a diagram of the working state of the novel composite repair pipeline water-blocking breathable elastic membrane;

in the figure: 1-primer layer, 2-water-blocking breathable one-way membrane, 3-composite fiber reinforced belt, 4-water, 5-saturated oxygen corrosion area, 6-pipeline, 7-novel composite repair pipeline water-blocking breathable elastic membrane.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Example 1

The repair process of using the novel composite repair pipeline water-blocking breathable elastic membrane is as follows: firstly, finding out the damaged or corroded position of a circulating water pipeline of each large petrochemical device to break soil, wherein the excavation depth is more than 0.5m, the soil breaking width is about 0.5m away from the surface of the pipeline, and carrying out surface treatment on the damaged or corroded position of the pipeline, and the rust removal grade is Sa2.5; then repairing the pitting corrosion part on the surface of the pipeline by using a high molecular metal repairing agent to restore the integrity of the equipment; then, the novel composite restoration pipeline water-blocking breathable elastic film is used for carrying out anticorrosion reinforcement on the pipeline, the novel composite restoration pipeline water-blocking breathable elastic film is used for sealing the front and back of a damaged or corroded position by 0.3m respectively, and the construction requires that the surface temperature of the pipeline is not lower than 15 ℃; and finally, backfilling the ground to restore the original state.

The novel composite repair pipeline water-blocking breathable elastic membrane repair pipeline can be quickly and simply constructed on site, does not need special equipment or fire operation, and can resist chemical corrosion of various chemicals, oil and process fluids.

Example 2

Firstly, the surface treatment is carried out on the saturated oxygen corrosion area of the circulating water pipeline, the saturated oxygen corrosion area reaches the Belzoner construction standard, and the metal body is exposed, so that the construction surface is clean, firm, rough and dry. The execution standard is as follows: the requirements of US standard SSPC SP-6/ISO8501-1 Sa 2/Swedish standard Sa 2SIS 055900 are met.

The method comprises the steps of forcibly and uniformly brushing a Belzoner polymer pasty material on a base material area needing to be repaired and reinforced, so that the material is fully contacted with the surface of the base material, and the corroded area is repaired without any air bubbles or missing coating.

The novel composite repair pipeline water-blocking breathable elastic film is wound on the repaired pipeline in a spiral mode, and is wound by 3 layers by using the standard that the novel composite repair pipeline water-blocking breathable elastic film is overlapped by 50%.

When the pipeline is repaired and reinforced, the ground is backfilled to restore the original state, and the novel composite repair pipeline water-blocking and breathable elastic membrane can effectively avoid the health and safety problems brought by other traditional repair methods, so that an economical and durable alternative scheme is provided.

The above is only the preferred embodiment of the present invention, and it should be understood that the above description of the embodiment is only used to help understand the method and the core idea of the present invention, and is not used to limit the protection scope of the present invention, and any modification, equivalent replacement, etc. made within the idea and principle of the present invention should be included in the protection scope of the present invention.

Claims (2)

1. The utility model provides a novel compound pipeline of restoreing ventilative elastic membrane that blocks water which characterized in that: the novel composite repair pipeline water-blocking breathable elastic film comprises a primer layer (1), a water-blocking breathable unidirectional film (2) and a composite fiber reinforced belt (3); the innermost layer is a bottom glue layer (1), the secondary inner layer and the outermost layer are water-blocking breathable unidirectional films (2), a secondary outer layer composite fiber reinforced belt (3) is arranged between the two water-blocking breathable unidirectional films (2), and the layers are connected through an adhesive; the waterproof and breathable one-way film (2) realizes the waterproof and breathable functions, and the composite fiber reinforced belt (3) solves the problem of insufficient strength.

2. The novel composite repair pipeline water-blocking breathable elastic film as claimed in claim 1, wherein: the bottom glue layer (1) is made of a high-molecular adhesive material and is used for being directly adhered to the repair area.

Images