Improvements relating to pipelaying

摘要

An alignment tool (166) for aligning a secondary elongate element (28) with a primary elongate element (14) for subsea laying of the elements in a piggybacked arrangement comprises: • a support structure (168) arranged to embrace the primary element, the support structure having an opening for accommodating the primary element such that the primary element can move longitudinally through the opening in a launching direction; and • attachment points (180) for supporting the tool to maintain or control its longitudinal and/or angular position with respect to the primary element as the primary element moves through the opening.