Direct lay-away method

With this method (see Figure A.27), the flowline or umbilical is keel-hauled from the installation vessel/reelship into the moonpool of the vessel installing the subsea tree, and attached to the tree prior to its deployment.

Close coordination between the tree-installation vessel and the reelship is obviously required. As the subsea tree is lowered to the seafloor, the reelship pays out the flowline and commences to move away from the tree installation vessel so that the line is not subjected to overbending.

Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards

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