Pipeline repair and reinforcement technology Introduction

1. Welding Technique

This type of repair is to apply welding to pipeline defects in order to restoring the strength of the steel. Surface welding mainly applies to small single point defect, patch welding to multi-points corrosion in small area, and making sleeve for large area of corrosion. The common advantage of welding approach is low cost. And the drawbacks are listed as below:

2. Clamp Technique

Clamp Technique is to apply mechanical clamp devices to restore the pipeline service strength. This technique avoids direct welding on service pipeline, thus avoids above mentioned direct welding risks. However, the drawback is clamp construction and implementation is relatively complicated with high cost, clamp corrosion is also a big problem. 

3. Fiber Composite Repair Technique

Fiber Composite Repair Technique has been utilized for steel pipelines since 1990. It synergizes the high strength feature of fiber material with the adhesive resin coating outside the service pipeline, to restore its service strength. Its advantage is that it eliminates the need and risk of welding, shut down of the pipeline, environmental exposure. The cost is between welding and clamp technique while overall performance is the best among the three. Composite Repair technique is now a

widely accepted approach among global pipeline companies.

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