Leak repair and pipeline reinforcement at girth weld of DN700 mm oil pipeline

The pipeline operator detected a leak at the girth weld of a carbon steel pipeline operating at working pressure 16 bar. The damaged weld is on an elbow with a reduction from a diameter of 28-inch to 20-inch (reducer).

Challenge

Composite repair materials cannot be installed directly over the leaking pipe. Leaks need to be stopped always before moving on. This case study describes how to stop the leak. Second challenge was the geometry of the wrapping area. Using different width carbon cloth almost every geometry can be wrapped, like in this case the reducer section of the line.

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Floating roof repair of the crude oil tank

Tank parks are located all over the world. Many of these tanks contain crude oil or derivates of oil. Characteristic for these tanks is the floating roof. This floating roof moves up and down in relation to the volume of the tank. These roofs are subject of corrosion attack. Holes due to corrosion in these roofs need to be fixed for safety reasons.

Challenge

Oil storage tanks are huge and the floating roof of a tank can have a wingspan of tens of meters. Wrapping the complete roof would be a ridiculous task and a very costly operation. Also hot work in these areas is not possible because of the flammable and explosive materials in the tank. In such cases we will perform the repairs by using a combination of plates, to cover the holes glued to the roof itself, and carbon cloth patches. Also here Putty (compressive modulus filler) and Primer are applied prior installing the carbon patches. Preparation of the roof is done by using pneumatic tools to roughen the surface.

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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.

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