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Month: June 2022

CS-012 High pressure transmission pipeline of natural gas tee reinforcement

Transmission pipelines are widespread. Most of these pipelines you are not aware of, because they are located underground or at the bottom of the sea. Gas and Oil are typical media transported via transmission pipelines. It is crucial to keep these lines in perfect condition as many times high pressure is involved. This infrastructure also includes block valve stations (BVS) at certain distances. Equipment located in these stations need good maintenance. Inspection discovered welded joints on the gas transmission pipeline did show a high-level degradation. Immediate action was required.

Challenge

The repair challenge in this case was to strengthen the affected weld of a reducing tee (from 18- to 2-inch) at a pressure close to 100 bar. Wrapping a normal tee already is a job that needs to be performed by a trained installer. Wrapping a tee with this large difference in diameter requires even more skills. Together with the client we have designed a flower wrap. This case study will provide you with some inside.

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CS-011 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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CS-010 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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CS-009 Additional reinforcement of the pipeline diameter of DN530 mm

The operator of the high-pressure crude oil pipeline requested additional protection due to the planned construction of a motorway above this 20-inch line. The pipeline should be strengthened for a length of 40-meters.

Challenge

Wrapping a pipeline of such a diameter for 40 meters is a job that requires good organization. A blasted and clean surface of the pipeline should be wrapped as soon as possible to avoid flash rust. Irregular surfaces will be treated by a Putty, a compressive modulus filler, followed by applying the Primer for an optimal adhesion between the wrap and the pipeline. The process of mixing and setting of these two-component epoxies is irreversible. The surface still needs to be a bit sticky when the impregnated carbon cloth is wrapped around the pipe. The whole process should be performed in steps and the team leader should keep all crew members busy during the installation.

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