阴APP导航

In offshore pipeline constructions, high productivity is required to minimize pipe laying cost. One of the most significant methods for achieving higher productivity is to reduce the welding defects, which lead to repairs.

Recently, the acceptable level of welding quality, especially the root pass, becomes higher and higher. This means minimizing misalignment between both pipe ends is required to get rid of welding defects triggers.

On the contrary, the tolerances of commercially manufactured pipes have not been revised and shape fluctuation between both pipe ends is not ideal for welding condition. Various line-up clamp systems of pipes have been employed, however their control range is too limited to realize ideal alignment. To solve this problem fundamentally, authors have developed a pipe end forming equipment named PERFECTS, to aim at perfect alignment between both pipe ends for girth welding. Applying the PERFECTS, pipe ends are equalized in the shape, i.e. both diameter and roundness, and are fitted easily with each other for welding.

The PERFECTS has two additional features. One is Compactness. The compact design enables its easy installation onto the existing barge with minimum modifications. The other is quick processing. The processing duration does not cause any interruption for the cycle time of pipe laying operation.

This shape equalization between both pipe ends by the PERFECTS, leads to not only elimination of welding defects but also reduction of pipe fitting time prior to welding. We believe that the PERFECTS will highly contribute to improve pipe laying productivity.