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Loctite composite repair system for pipes

News International-French

25 Jul 2014

DNV GL, one of the leading certification bodies, certified Loctite composite repair system for steel pipes and pipelines.

Henkel is taking a new approach to repairing steel pipes and pipelines and is focusing on certified safety. DNV GL, one of the leading certification bodies, recently completed a thorough testing program to confirm that Henkel’s repair system is meeting all requirements of the global quality standard ISO/TS 24817. It defines the design, installation, test and inspection criteria for the use of composite repair systems for oil and gas pipelines and pipework carrying petrochemical media.

Steel pipelines are extremely capital intensive – no matter whether they are used to transport gas, water, crude oil, wastewater or any other medium. It therefore pays to continue to operate them as long as possible after the planned amortization and depreciation period. The lifetime of such transport systems thus becomes a critical issue.

Because the steel shell is constantly exposed, externally or internally, to the combined corrosive effects of climate factors, mechanical stress and chemical attack, pipeline operators habitually have to deal with cracks, holes, fractures and leaks. In the past, it was common practice to completely replace the affected sections of pipework. However, as this always involves a transport stoppage, maintenance and repair organizations are increasingly switching to repair systems as fast and economical alternatives that do not interrupt operations.

The repair system recently certified by DNV GL is an all-in-one package providing a mature technology with the added assurance of certified safety. In complex test procedures, including a number of long-term tests, the innovative products were rigorously examined by the internationally operating classification society over a period of almost two years.

The heart of the new repair system is a composite material made of resin reinforced with fibers, similar to the materials with which Henkel is already successfully serving manufacturers of rotor blades for wind power plants or lightweight components for the automotive industry. In steel pipelines the composite repair system reinforces damaged pipe sections while also protecting them against renewed corrosion.

Certified repair system 
The Loctite Composite Repair System certified according to ISO/TS 24817 is suitable to repair both Type A (non-through wall) as well as Type B (through wall) defects, covering all repair classes 1-3. In addition to straight pipes also other components like bends, tees, reducers or flanges can be repaired.

The first step in the repair procedure is to clean and sandblast the surface in the repair area. Since blasted metal surfaces are extremely susceptible to flash rust, Henkel recommends applying the corrosion inhibitor Loctite SF 7515 as a surface treatment providing temporary protection. In case of Type A defects the original outer pipe diameter needs to be restored by filling the cavities with Loctite EA 3478. The pipe is then wrapped with high-strength glass-carbon fiber tape Loctite 5085 that has been impregnated with the temperature-resistant, two-part epoxy resin Loctite PC 7210. This adhesive has been specifically engineered for bonding to steel substrates and exhibits exceptionally high adhesion. The repaired section is then sealed with the sprayable ceramic topcoat Loctite PC 7255. The composite repair system thus reinforces steel pipes for continued duty under high pressure and thermal cycling while increasing their chemical resistance.

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