Repairing dents in an underground carbon-steel pipeline

Dents in transmission pipelines are a common problem that need to be fixed as soon as possible. Dents will make the pipeline in that particular area weaker. There is a chance of crack forming or even creation of a hole if the dents are not properly repaired. CTE BV is working with epoxy composites and carbon fiber cloth to save repair the pipeline. Compressive Modular Filler (CMF) is applied to bring back the dent area in it’s normal shape. The carbon fiber cloth in combination with epoxy composites will bring back the integrity of the pipe after curing. The case study explains how to approach a dent defect in your pipeline. The repair is performed according the standard ISO 24817.

Challenge

The repair has to take place under pressure to push out the dent as much as possible before applying the CMF putty and carbon fiber wrap. Often natural gas pipelines are buried and access is only allowed when the installer did receive a confined space training.

Read our casestudy

Extending the lifetime of a pipeline with ten years in 48 hours

Flare lines at refineries often suffer from corrosion. These lines are crucial for the refinery as these systems are used for safe disposal of waste gases by burning them under controlled conditions. Imagine the mixture of chemistry these lines face. Very susceptible for corrosion attacks, mainly internally but also external. The often high temperatures of the medium also accelerate corrosion. Blasting, cleaning and wrapping the lines by applying composite materials is a way to extend the lifetime. Composite materials have strong capabilities and it’s a durable and environmentally accepted method for repair. The engineered repair applied can withstand a 100% wall loss situation of a certain diameter.

Challenge

In this particular case blasting the pipe was not an option. The crew had to roughen and clean the flare line sections by hand(tools). In many instances a Bristle Blaster® of Monti may be the solution. Surface preparation is a key part of a successful wrapping project.

Read our casestudy

Repairing a massive carbon steel pipe within 24 hours

A small leak under a metal sleeve at a 28” pipe is a problem and requests a fast and proper solution. The size of the sleeve basically would be considered as the defected area which required a repair of a reasonable size. By dropping the pressure in the pipeline the small leak was stopped and contained. Immediately after the leak was stopped the engineered carbon fiber epoxy based system was applied covering the sleeve and surrounding pipe area. The multi-layer carbon fiber solution will last for many years.

Challenge

The timeframe between starting preparation of the 100 kg repair kit, shipping from the Netherlands to Croatia, installing the wrap and curing of the epoxy was roughly 24 hours.

Read our casestudy

Proactive corrosion protection for a carbon steel storage tank

Tank repair by applying composites is getting more and more popular. Often the roof of a tank is affected by corrosion. Corrosion due to the medium (might be aggressive) or exposing to the weather conditions. Also the tank wall itself might be exposed to corrosion. Often cracking or degradation of the wall is a problem. In the Netherlands and Belgium we as CTE BV are providing these services by installing carbon patches. The case study below is describing the repair of cooling water tanks suffering from internal corrosion at a steel plant.

Challenge

Cooling water is an important part of the process of making steel. Without proper cooling a plant can come to a standstill. Working inside a tank requires a special training (confined space) on top of the normal installation certificate.

Read our casestudy