With this article, the authors have endeavored to demonstrate the following: 1. Down-lines play an important role in the pre-commissioning of deepwater pipelines 2. Coiled tubing should be considered as the preferred down-line system except where very large bore down-lines are required. Even then, multiple coiled tubing down-lines can be considered as an alternative. 3. Custom marine coiled tubing systems provide the flexibility for moonpool or over-the-side deployment and are largely self-supporting once installed. 4. Engineering and modeling is required prior to deploying coiled tubing in a blue-water environment. 5. A partial dewatering system offers a faster, lower cost alternative to a full wet buckle contingency dewatering system, especially for pipelines not intended for hydrostatic pressure testing.
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