What Are the Different Methods for Duct Repair?

Pipeline repair refers to the use of various technologies to restore damaged and leaking transmission pipelines to their normal use functions. The repairs include two technologies, namely the repair of the outer anticorrosive layer and the repair of the inner layer.

Pipeline repair

Pipeline repair refers to the use of various technologies to restore damaged and leaking transmission pipelines to their normal use functions. The repairs include the repair of outer anticorrosive layers.

After years of operation of various pipelines, due to

There are many methods for pipeline repair. Before planning the repair, you need to evaluate the effectiveness, long-term, reliability, safety, and cost of different pipeline repair programs according to your own pipeline conditions, so as to determine the most suitable repair program.

Systematic surveys of pipeline overhaul construction technology levels, repair methods, materials and equipment in foreign countries, especially in Europe and the United States, are considered to be the result of the introduction of foreign advanced repair technologies, mechanized repair equipment and products to China.

(A) pipe replacement repair

All problems in the repair section can be solved at one time and are permanent. However, pipe replacement and repair also have obvious shortcomings. Pipeline companies must stop production during construction operations, which will have an impact on downstream users. At the same time, there are certain safety and environmental risks in the pipe replacement operation, especially for dangerous medium pipelines such as natural gas and refined oil, which require higher safety measures for construction operations.

In addition, the pipe replacement construction operation requires large-scale equipment and excellent welding technical workers, which also takes a long time. Therefore, in most cases, the pipe replacement is the most costly repair solution, and it is also the least preferred by the pipeline company. However, when long-distance pipelines need to be repaired continuously, or when there are multiple problems with the pipeline, including materials, pipe replacement may be the only option.

(II) Surfacing / repair welding

Most pipeline companies consider the use of surfacing or repair welding to repair pipeline defects as a very convenient and easy-to-use repair solution. On a running pipeline

Pipeline inspection

There are risks involved in welding operations. These risks include the risk of wall burn-in / burst, hydrogen embrittlement, and cracks under the weld. In the case of non-stop welding, the welding current cannot be too high, and the welding penetration cannot be too large. Moreover, once the pipe is corroded and perforated at the welding site, a pressure cavity will be formed between the outer wall of the original pipe and the reinforced steel plate. Since the weld is not welded through, the weld seam will be easily broken and cause greater losses. Therefore, between welding repairs, these risk factors need to be evaluated.

(Three) ripert water activated polymer winding tape

The leak repair can be completed in a few minutes. It can be well applied to plastic pipes, metal pipes and polyethylene pipes. It can be used on straight pipes, elbows, tees and intermediate joints, and can withstand 450PSI pressure. The complete repair tool is just adding water!

Water-activated polymer winding tapes are applied to leak repair systems cured at a pressure of 450PSI for low pressure applications (depending on roll number and size) for 30 minutes. It consists of a water-activated polyurethane pre-impregnated glass fiber mesh material and epoxy stucco filling. The winding tape will be affected by the humidity in the air. It must be activated by the supplied water (purified water or brine). After application and curing, it forms an integral protective cover like a shell, and the product is non-toxic corresponding to water.

Temperature limit: -20 ° F to 250 ° F (temperature> 150 ° F may affect pressure resistance)

The water-activated polymer winding tape is maintained for 3-5 minutes without falling off. When the temperature is between 50 ° F and 80 ° F, it is completely cured after 30 minutes. Low temperature will increase the curing time, and high temperature will shorten the curing time.

For longitudinal reinforcement: A 50% overlapping overlay is most effective for longitudinal reinforcement strength. When applied at oblique angles, it should be folded (not twisted) to change the winding direction.

Chemical compatibility table: This product is resistant to most chemicals and oils. No significant change after 35-day soaking in the following chemicals: acetone, ammonia, sulfuric acid (30%), ethanol, hydrochloric acid, petroleum ether, butanol, toluene, diesel, hydrocarbon solvents, ethylene diether, crude oil, hydraulic oil, two Toluene and mixed OMP; this repair product can be used with polyurethane compatible products. The user must consider the adaptability of the product according to the actual situation, and recognize that strong acids or alkalis will affect the durability of the repair.

Advantages: Complete repair set (no special tools required) Safe to apply water. Permanent repair in minutes. Easy to use. Multiple applications. Can be bonded to multiple materials (plastic, metal or polyethylene).

Applications: pipelines, factories, urban water, natural gas distribution pipelines, oil and gas, collection and irrigation lines, maritime applications

(4) Dimot Leak Repair Set

Dimot is a polymer material made of selected steel, aluminum and other metal particles. This formula is based on the world's latest molecular cold welding technology, far exceeding the repair of epoxy resin. This technology has been providing high quality cold welding repairs for industrial and military applications since 1966. Decades of continuous research and upgrade, Dimot repair technology and become the world's most advanced field application repair technology

Dimot technology is widely used in various equipment problems such as leakage, wear, corrosion, cracking, deformation under various industrial and mining conditions. This product can be used to bond many material surfaces (metal or non-metal), and it can be combined with any material or material mixture, whether defective or not. When the two components are mixed, different molecules combine to form polymer chains. These polymer chains interweave metal particles to form a three-dimensional three-dimensional structure, forming a new and durable metal-based material with excellent physical properties.

Do not confuse this product with other epoxy resins, similar repair compounds or adhesives, it is a metal-based product that is easy to machine and can replace the stripped threads without special tools. The molecular reaction of this product requires: 3-4 hours for the standard type and 3-4 minutes for the ultra-fast type. A Dimot suit can repair 50-60 times.

Each set includes 2 basic products: Ultra-Fast and Standard.

Ultra-fast type is the world's famous product for blocking leaks of oil, grease or wet surfaces. It can be applied in water and oil immersion environments. Cured in 3-4 minutes.

Standard version for repairing dry surfaces with metallic and non-metallic materials. 3-4 minutes to cure and provide a permanent repair that can be machined or drilled.

(5) EA pipeline repair

This structural system forms a pipe around another pipe, each successive winding increasing the pressure rating. Bidirectional interleaving

Underwater pipeline repair

The hoop and the axial direction are allowed to generate strength. Over time, the system has little or no creep performance and ensures that its strength does not decrease. EA service composite winding low profile repair can be used for tees, elbows, straight sections of pipes, confined spaces and irregular surfaces that require reinforcement or plugging. The adhesive properties of epoxy resins allow the wrapping system to package instruments for most substrates.

main application:

Pipeline repair

Dent repair

Crack repair

Corrosion repair

Undersea / underwater repair

Stop corrosion

Anti-corrosion saves time, effort and equipment cost

Extend the life of pipelines and infrastructure

Reduce or eliminate downtime

Improve safety performance

For all pipe sizes, repair any size of fence, pile foundation or tank.

Corrosion repair of pipelines

Compatible with carbon, stainless steel, alloys, fiberglass, and polyvinyl chloride or more

No volatile organic compounds

Can be wound while the pipeline is running

No duct exhaust required

No need to weld pipes

No need to cut pipes

Used in chemical, thermal and volatile systems

Consistent with DOT and ASME standards

Fast-setting curing agent designed for emergency repair.

Fast! Fast curing! 80% cure no more than 30 minutes 100% no more than 1 hour.

Strong resistance to chemical corrosion: resistance to organic acids up to 10%, various salt engine oils, aviation kerosene and gasoline

Easy-to-use packaging: 1: 1 mixing ratio of the two components, each packed in a 12 cubic inch tube, and squeezed as much as possible to avoid waste.

(7) Repair of Opti pipeline

1.Pipe repair kit-for pressure repair of pipes and hoses

This kit is used for rapid maintenance and repair of pipeline cracks or breaks under pressure, and can be repaired on the ground or underground or even underwater.

For metal, plastic, PVC, glass, rubber, concrete & ceramic pipes and hoses; no mixing or measurement required; cures in 30 minutes even under water; odorless, non-toxic, non-flammable; suitable for There are petroleum distillates, organic solvents and most acids and alkalis; if necessary, they can be sanded or painted after curing; rubber self-adhesive tape can only withstand a pressure of 4 kg / cm2, and when the winding tape is cured, it can withstand 300 kg / cm2 pressure, withstands intermittent temperatures up to 235 ° C; can be used for corrosion protection, reinforcement, pipeline protection and insulation, up to 16KV. Reduces the cost of expensive emergency plumbers.

2.For non-pressure repair of pipes and hoses

This kit is used for rapid maintenance and repair of pipeline cracks or breaks, but it is not repaired under pressure. It can be immersed in the ground or underground, even in water.

To. Opti Pipe Repair is a very useful aid to enable you to cope with unexpected emergency repairs. In many cases, the Opti Repair Kit is an effective permanent repair tool.

For metal, plastic, PVC, glass, rubber, concrete & ceramic pipes and hoses; no mixing or measurement required; cures under 30 minutes even under water; odorless, non-toxic, non-flammable; suitable for Environment with petroleum distillates, organic solvents and most acids and alkalis; epoxy stucco is suitable for use with drinking water; sanding or painting after curing is possible; once cured, it can withstand 300 kg / cm2 , Withstand intermittent temperature up to 235 ; can be used for corrosion protection, reinforcement, pipeline protection and insulation, up to 16KV.

Reduces the cost of expensive emergency plumbers Read all instructions before opening the packing tape.