When utilizing helical strakes, a critical decision is how much of the tubular to cover with helical strakes. While minimizing the cost of the helical strakes is one objective, often it is not possible to fully cover a tubular due to connectors, anodes, and other appurtenances. There are also important questions around ascertaining the performance of helical strakes when only a portion of the tubular is covered, for example when the top portion of a tubular is straked and the remainder is left bare.

This paper combines results from two testing programs on long cylinders towed at high Reynolds numbers to assess the performance of helical strakes with differing conditions along the cylinder length. The results show that the coverage length, density, and location of the helical strakes have a substantial effect on both the local and global response of the tubular.

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