Peter Ivicevich and Tom Seeber, Atteris LLC, USA, consider the benefits and drawbacks of both pre-trenching and post-trenching in subsea environments. A subsea pipeline engineer will, at times, conclude that placing a pipeline in a trench will stabilise or otherwise protect the pipe. The next decision is then whether to lay the pipeline into a prepared trench or to lower it into the seabed after its installation. So, to pre-trench or to post-trench? That Is the question. This article will discuss the factors affecting this specific design element.
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