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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Repairing a carbon-steel pipeline 11 meters above the ground

Repairing a tee using composites needs a special training program. During Level-1 training courses applied by CTE BV applicants will be trained according ISO 24817 and/or ASME PCC-2 standards. If applied correctly the number of layers over the defected area should count 4-8 layers. In this case one of the girth welds needed to be strengthen by applying a carbon fiber and epoxy composite repair. This operation is a very common activity that trained installers perform daily.

Challenge

The particular challenge in this case was working at height and with a High Temperature solution. Access to the repair area was complicated due to the lack of being able to bring in aerial platform equipment. Scaffolding was the only possibility for the installers to save repair the tee. Although the cost for scaffolding and other safety precautions did increase operational costs, the composite repair was preferred above replacing this part of the pipe. Finally the high ROI (Return on Investment) did decide management to carry out the repair.

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Reinforcing tee joints at a Refinery

Reinforcement of straight pipes, elbow, tees and other geometry by applying the engineered carbon fiber epoxy system provided by CTE BV. This way of repairing pipes at petrochemical plants and/or off-shore platforms saves the client many millions of Euros. Besides an attractive ROI (Return On Investment) this way of repair is also environmentally sound and sustainable. In many cases the carbon fiber wrap will last the lifetime of the pipe.

Challenge

Fast delivery of reliable materials to support the certified installers.

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