Offshore deployment device for an installation vessel (4) with a deck (5) to deploy a hydrocarbon transfer pipe (2) composed of several pipe segments (3), the device including a trolley hoist lifting element (10), installed in a tower (6) to lift a pipe segment from an horizontal position into a vertical position, an assembly platform (8), where a segment is connected to a previously launched transfer pipe string, the assembly platform being provided with a clamping device that is supported on the installation vessel and adapted to support the weight of the previously launched pipe string during assembling, wherein the hydrocarbon transfer pipe is a flexible hose string composed of several flexible hose segments, the flexible hose string being guided from a vertical position into an inclined or a horizontal position via a hose string guide element (15) which is placed under the assembly platform.
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